( Log Out / Concrete mix design is required to achieve target strength in structures. the compressive strength of concrete. 28 days 99%. The expected cube compressive strength of concrete mixes is m15 and m20. Fig.5: Effect of specimen size on 7-days compressive strength Fig.6: Effect of specimen size on 28-days compressive strength . 43 Grade Cement- It achieve compressive strength of 43 N/mm2 In 28 days. The below two tables show the strength of concrete at different ages. Table-1 shows the strength of concrete at different ages in comparison with the strength at 28 days after casting. International codes and the concrete grades To accurately predict the concrete compressive strength using SVM, a data set with a large amount of experimental data is required. Lev Khazanovich, Principal Investigator Department of Civil, Environmental, and Geo- Engineering University of Minnesota. Cement based materials develop strength with continued hydration. Furthermore, it is commonly considered as a reference for many other properties, such as the tensile strength and elastic modulus of concrete. 0.2 Testing plays an important role in controlling the quality of … Additional tests are frequently TABLE 3.1 STRENGTH REQUIREMENTS TYPE OR LOCATION OF CONCRETE CONSTRUCTION SPECIFIED COMPRESSIVE STRENGTH, PSI Concrete fill Below 2000 The compressive behavior is evaluated with compressive test machine shown in Figure 3 at each time interval of 1, 3, 7, 14, and 28. 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The American Society for Material Test ASTM C39 / C39M provides a standard test method for the compressive strength of cylindrical concrete samples. 3- or 7-day test results are used to monitor early strength gain, … Compressive strength test of concrete cube is the most important strength test for concrete. Prediction of compressive strength of concrete from early age test result M. Monjurul Hasan & Ahsanul Kabir Department of Civil Engineering, Bangladesh University of Engineering and Technology, Dhaka 1000, Bangladesh ABSTRACT: In the construction process, it is always important to know the concrete compressive strength. The compressive strength tests were carried out in confirmatory with JIS A 1108 (Method of test for compressive strength of concrete) [30 Method of test for compressive strength of concrete, JIS A 1108, .]. The figure-1 below shows the strength varia… How to calculate strength of concrete in between 7 to 14 days,14 to 21days etc. fire resistance, high compressive strength and low maintenance. Compressive strengths at various ages were determined for concrete specimens of different sizes. The RAC incorporates recycled coarse aggregate (RCA) originated from crushing construction and demolition waste. “The compressive strength of concrete is given in terms of the characteristic compressive strength of 150 mm size cubes tested at 28 days (fck). Concrete compressive strength is predicted using various methods. Compressive strength also gives a good overall picture of the quality of concrete. If you are interested in how the visualizations are created in the notebook, please feel free to explore this Python file. 5.2 The relationship between early-age strength of test specimens and strength achieved at some later age under standard curing depends upon the materials comprising the concrete. By performing this test we can predict about manufactured Concrete is done properly or not. Most codes of practice do not consider the increase of strength beyond 28 days for design purposes [ACI [2], ECP [3], ]. Test results show that the concrete subjected to a high temperature at an early age attains higher early-age strength but eventually attains lower later-age strength. Assume a slab at our site is designed to cast M25 grade of concrete, but we could not define its strength in the semi-solid state. B. 53 Grade Cement- Heat of hydration is higher. The testing apparatus is exhibited in Fig. How do I calculate volume of 50 Kg cement bag? 53 Grade Cement- It achieve compressive strength of 27 N/mm 2 In 3 days. Most researches were conducted to study the 28th-day strength of concrete. According to section 19.2.1.3 of ACI 318-19 the specified compressive strength shall be based on the 28-day test results unless otherwise specified in the construction documents. The compressive strength tests were conducted on the 3 rd, 7 th, 28 th and 91 st days. The characteristic strength is defined as the strength of the concrete below which not more than 5% of the test results are expected to fall.”. The rate of gain of strength is faster at start and the rate gets reduced with age [1]. But actually, concrete develops strength beyond 28 days also. Specific codes are designate to indicate the same for different structures. The concrete grades are normally indicated as M30 or C30 or C30/37 and so on depending on the code. With this individual test, someone can decide whether or not the concrete was properly worked out. The tensile strength of concrete varies from 7% to 11% of the compressive strength but on average it is taken as 10% of compressive strength. Different Grades of Concrete and their Uses/Applications, What is slump & It's types, Values for various construction work, How to calculate Quantity of Cement, Sand & water In Mortar of 1:4, How to calculate number of Bricks per Square meter (m2), Difference between dowel bars and tie bars, Difference between Compaction and Consolidation of Soil. Change ), You are commenting using your Facebook account. It is then tested in compression at various ages. Results obtained to date show significant differences in the compressive strength results due to specimen size and minor differences due to different loading rates. But actually, concrete develops strength beyond 28 days also. Although concrete compressive strength can be measured at different ages, codes generally specify standard 28-day testing [1,2]. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. Testing and modeling the young age compressive strength for high workability concrete modified with PCE polymers @inproceedings{Abdalla2019TestingAM, title={Testing and modeling the young age compressive strength for high workability concrete modified with PCE polymers}, author={Lajan Burhan … Materials 2021, 14, 190 2 of 15 to a higher compressive strength in concrete and compared to ﬂy ash concrete, concrete containing ground glass exhibited a higher strength at both early and late ages [3]. two different high-strength concrete mixtures were used. Concrete is a macro content with Sand, Cement, & Coarse aggregate as its micro-ingredient (Mix Ratio) and gains its 100% strength over time at the hardened state. The size and shape may also affect the indicated strength. 43 Grade Cement- It is used for, tiling, Stonemasonry, Culvert, Bridge, Road, Retaining Structure, etc. The low grade i.e. They are different from each other due to their compressive strength. Approximately the price varies from Rs. Percentage strength of concrete at various ages The strength of… Each of It depends upon the manufacturing company of cement. Characteristic strength of the concrete is designated as the compressive strength of a concrete sample that has been cured for 28 days and is determined by the Change ). 1 day 16%. Strength). 53 Grade Cement- It achieve compressive strength of 53 N/mm2 In 28 days. 33 Grade Cement- It is used for the low-grade structure below M20 Grade. Bhutto and Memon [4] in their research work studied effect of cube size on compressive strength at different curing ages. Table 2: ... Split Tensile Strength of Concrete Definition, IS Code, Test Procedure, Formula. Testing method such as Non-destructive method, British Standard and Euro code are used to determine the compressive strength. Fig.7 & 8 depict the variation in relative compressive strength to 150 mm cubes at the age of 7 & 28 days for various grades of concrete. There is various standard codes recommends concrete cylinder or concrete cube as the standard specimen for the test. Otherwise, the compressive strength of concrete is defined as the maximum crushing stress endured by the concrete. You can test the specimen on that particular day, to do so you need extra concrete cube. Table shows the strength of concrete at different ages in comparison with the strength at 28 days after casting. Effect of size of specimen on Relative compressive strength of concrete . The alphabet ‘M’ or ‘c” refers to it as a ‘Concrete Mix’ and the number that follows indicates the characteristic strength of that that mix in MPa at 28 days. Further it has been observed that higher the compressive strength, lower the relative tensile strength. This experimental research investigates the effect of utilizing metakaolin (MK) on the behavior of recycled aggregate concrete (RAC). The unit of this compressive strength is Mpa (Mega Pascale) i.e. For cube test two types of specimens either cubes of 15 cm X 15 cm X 15 cm or 10cm X 10 cm x 10 cm depending upon the size of aggregate are … As per Indian code definition. We know the compressive strength is the ratio of load to unit area. 3- or 7-day test results are used to monitor early strength gain, especially when high early-strength concrete is used. The strength of concrete increases with age. It is customary to assume the 28 days strength as full strength of concrete. Concrete compressive strength is assumed as one of the most important mechanical properties of concrete since it usually shows the overall quality of concrete. Compressive Strength of Concrete = 450000 /22500 = 20N/mm² = 203Kg/cm². COMPRESSIVE STRENGTH OF VARIOUS AGES CONCRETES BY NON-DESTRUCTIVE TEST Initial strength of 53 Grade cement is higher than 33 Grade and 43 Grade Cement. N/mm2. Note that the code included in visuals.py is meant to be used out-of-the-box and not intended for manipulation. 33 Grade Cement- It achieve compressive strength of 22 N/mm2 In 7 days. The price may vary even for the same grade of cement. For cube test two types of specimens either cubes of 15 cm X 15 cm X 15 cm or 10cm X 10 cm x 10 cm depending upon … BS 1881 116 1983 Testing Concrete. Compressive strength of concrete is one of its most important engineering properties. For each grout, 15 ASTM verified cubes are cured based on the material plan summarized in Table 1 . Concrete specimens made from Types I and II portland cement were tested at ages between 1 day and 34 years. With time 33 Grade cement and 43 Grade Cement will attain the strength of 53 Grade of cement. From the literature review, it is observed that researches have been attempted on various aspects of flakiness of … (3.1) where: fcm. 43 Grade Cement- It achieve compressive strength of 33 N/mm2 In 7 days. In this test method, it is assumed that there is a linear relationship between strength and the logarithm of the maturity index. The reduction of conductivity versus curing age was modeled by using exponential decay function whereas the development of compressive strength curing age was modeled by using a nonlinear raising function. Change ), You are commenting using your Google account. The compressive strength is typically controlled with the ratio of water to cement when forming the concrete, and tensile strength is increased by additives, typically steel, to create reinforced concrete. IS:516-1959 Indian Standard METHODS OF TESTS FOR STRENGTH OF CONCRETE o. FOREWORD 0.1 This Indian Standard was adopted by the Indian Standards Institution on 10 November 1959, after the draft finalized by the Cement and Concrete Sectional Committee had been approved by the Building Division Council. Ordinary Portland Cement (OPC) has three grades that are 33 Grade, 43 Grade, and 53 Grade. & Why do we test concrete compressive strength after 28 days? Concrete Strength Required to Open to Tra˜c. Consequently Quality of concrete manufactured is often measured by its Compressive Strength. https://www.civilclick.com/modulus-of-elasticity-of-concrete But in reality, the strength at 28th day is less compared to the long-term strength that it can gain with age. The compressive strength of concrete provides an idea of all the characteristics of concrete. This fck,is can subsequently be applied directly in the design equations of EC2. This investigation presents results of the statistical and probabilistic analyses of 3,269 normal weight concrete cylinder compression tests used for recently constructed highway bridges in California. 5.1 Care must be exercised in the interpretation of the significance of compressive strength determinations by this test method since strength is not a fundamental or intrinsic property of concrete made from given materials. Take a look at the below table. The Compressive strength of concrete cube test is very important to test that provides an idea about all the characteristics of concrete. The cube tests are done at different intervals of time like 3 days, 7 days, and 28 days. Table.1: The strength of concrete at different ages in comparison with the strength at 28 days DOI: 10.1016/J.RINMA.2019.100004 Corpus ID: 198387879. The relation between the specified compressive strength in the Eurocode (code-crete) and the estimated strength within the realized structure (real- 1. Therefore, on the basis of concrete substrates of Chinese C25, sticky rice pulp with different concentrations was used to replace water to complete the preparation of concrete, and its slump and compressive strength test under different ages was carried out. Compressive strength as a concrete property depends on several factors related to the quality of used materials, mix design and quality control during concrete production. The authors used 50% old concrete as coarse aggregates and cured concrete samples at 7, 14, 28, 56 and 190 days. Cube strength = 1.25 X cylinder strength. Sorry, your blog cannot share posts by email. Traditional destructive test was used to obtain the concrete compressive strength at 3, 7, 14, and 28 days of curing. It is the strength of concrete that forms the basis of acceptance or rejection of concrete in construction. For 3 Days-33 Grade Cement- It achieve compressive strength of 16 N/mm 2 In 3 days. S trength of concrete depends on following factors such as water-cement ratio, strength of cement use, quality of concrete materials, quality control during production of concrete etc.. Test for compressive strength is can be dobe by either on cube or cylinder. For the compressive strength of concrete, all the gradient like cement, sand, and water are mixed together and made a cube. Click to share on WhatsApp (Opens in new window), Click to share on LinkedIn (Opens in new window), Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window), Click to email this to a friend (Opens in new window), 7 day compressive strength of concrete formula, compressive strength of concrete at 7 days and 28 days, compressive strength of concrete at various ages, CONCRETE COMPRESSIVE STRENGTH VARIATION WITH TIME, percentage strength of concrete at various ages, percentage strength of concrete at various ages as per aci, percentage strength of concrete at various ages as per is code, percentage strength of concrete at various ages pdf, Why We Test Concrete Compressive Strength after 28 Days, Follow we civil engineers on WordPress.com. ( Log Out / The compressive strength is tested on either the cube or the cylinder. Ex- Floor filling, plastering, making flower pots. Based on the discussion, a modified rate constant model is proposed. Depending on the applied code, the test sample may be cylinder [15 cm x 30 cm is common] or cube [15 cm x 15cm x 15 cm is the most common]. Research Project Final Report 2016-01 made in the size of specimen, grade of concrete & age of concrete. Fresh concrete is filled in three layers in a mould and each layer is compacted 25 times by tamping road, sometimes vibration table is … Different between slow sand filter(SSF) and rapid sand filter(RSF). 43 Grade Cement- It achieve compressive strength of 23 N/mm2 In 3 days. Relationships between the compressive strength at various ages and 28-day compressive strength are developed for specimens stored in moist and dry environments. The importance of different input parameters is also given for predicting the strengths at various ages using neural network. The compressive strength of concrete for general construction ranges from 15 MPa (2200 psi) to 30 MPa (4400 psi) and above in commercial and industrial structures 53 Grade Cement- RCC Structure like column, beam, slab, etc. You can calculate it by two methods. The same calculation is done for the specimen at different ages as stated below: 33 Grade Cement- It achieve compressive strength of 33 N/mm2 In 28 days. 33 Grade Cement- Heat of Hydration is lower. Data. For each grade of cement different IS Codes are used which are given as. Compressive Strength of Concrete. The full compressive strength of concrete or cube is completed after 28 days only. Tests of workability and mechanical properties such as compressive strength, splitting … Here, you should know the fact is the compressive strength 53 Grade cement does not grow after 28 Days but in the same way 33 Grade and 43 Grade of cement continues to gain strength even after 28 days. Mean value of concrete compressive strength at an age of t days, f cm (t) Eurocode 2 part 1-1: Design of concrete structures 3.1.2 (6) The compressive strength of concrete at various ages, f cm ( t ), may be estimated as follows: ... several existing and design code formulae were adopted to evaluate the performance of the current study. Change ), You are commenting using your Twitter account. 305 to Rs. January 2016. Different concrete types are made and cured for compressive strength test. Age Strength percent. 33 Grade Cement- It achieve compressive strength of 16 N/mm2 In 3 days. View all posts by Kishan Mudavath. According to section 19.2.1.3 of ACI 318-19 the specified compressive strength shall be based on the 28-day test results unless otherwise specified in the construction documents. Various methods of concrete testing are carried out to ensure that it remains of adequate strength and durability. Post was not sent - check your email addresses! Table shows the strength of concrete different ages in comparison with the strength at 28 days. in compression at various ages. After that, the cube is tested in the laboratory with help of a machine at 27 degrees centigrade. Compressive strength of concrete: Out of many test applied to the concrete, this is the utmost important which gives an idea about all the characteristics of concrete.By this single test one judge that whether Concreting has been done properly or not. 395 per bags of cement. Method for Determination of Compressive Strength of Concrete Cubes Enter your email address to follow this blog and receive notifications of new posts by email. 53 Grade Cement- It achieve compressive strength of 27 N/mm2 In 3 days. Compressive Strength of Concrete at Various Ages. Due to lower heat of hydration, the 33 grade of cement gets micro cracking which may not visible with our naked eyes. You interpolate the values (but this will give only approx. The maximum tensile strength of concrete has been found of the order of 42.0 kg/cm 2. During the production of concrete Compressive strength of concrete depend on different factors such as cement strength, quality of concrete material, water-cement ratio, etc. In spite of considering the 28-day compressive strength for design purposes, actually concrete develops strength beyond 28 days as well. 14 days 90%. I am a civil engineer, Currently working in Bharat petroleum corporation limited, It is one of the fortune 500 companies in world. Various standard codes recommend the use of a concrete cylinder or concrete cube as a standard sample for testing. 33 Grade Cement has lower price than 43 Grade or 53 Grade Cement. Compressive strength of concrete: Out of many test applied to the concrete, this is the utmost important which gives an idea about all the characteristics of concrete.By this single test one judge that whether Concreting has been done properly or not. For 7 Days- This paper discusses the validity of models predicting the compressive strength of concrete subjected to various temperature histories and the shortcomings of existing rate constant model and apparent activation energy concept. Prediction of FRP-confined compressive strength of concrete using artificial neural networks. The compressive strength is typically controlled with the ratio of water to cement when forming the concrete, and tensile strength is increased by additives, typically steel, to create reinforced concrete. The compressive strength test results indicated that recycled glass mortar and concrete gave The compressive strength of concrete at various ages, fcm ( t ), may be estimated as follows: fcm ( t) = βcc ( t )⋅ fcm. 43 Grade Cement- It achieve compressive strength of 23 N/mm 2 In 3 days. . 2. Characteristic Strength = Grade of Concrete Defined as compressive strength of concrete specimen after 28 days of curing M25 , M30 , M35 , M40 , etc ., ………. Compared to field testing, the indoor accelerated corrosion testing can be performed with a controlled environment and thus has been widely applied to quickly obtain the compressive strength of concrete [22, 23]. Compressive Strength of Concrete at Various Ages. A. Concrete has relatively high compressive strength (it doesn't crack under weight), but significantly lower tensile strength (it cracks when being pulled). A total of 4 mixes were prepared by varying the grade of concrete mixes. is the mean compressive strength at 28 days, see Table 3.1. βcc ( t) is a coefficient which depends on the age of the concrete t: βcc ( t) = exp { s [1 - (28/ t) 1/2] } Compressive Strength of Concrete. 43 Grade Cement- Heat of hydration is medium. Concrete mix design by ACI method is popularly used in Bangladesh for producing concrete of required strength, but for determining its compressive strength one has to wait 28-day after casting. Depending on the applied code, the test sample may be cylinder [15 cm x 30 cm is common] or cube [15 cm x 15cm x 15 cm is the most common]. The concrete strength variation with age can be studied by different methods. Concrete develops strength with continued hydration. IS 456: 2000 CONTENTS PAGE SECTION 1 GENERAL J SCOPE 2 REFERBNCES 3 TERMINOLOGY 4 SVMBOU SECTION 2 MATERIALS, WORKMANSHIP, INSPECTION ANDTESTING 5 MATERIALS 5.1 Cement 5.2 MineralAdmixtures 5.3 Aggregates 5.4 Water 5.5 Admixtures 5.6 Reinforcement 5.7 Storageof Materials It means the difference between 33 Grade, 43 Grade, and 53 Grade of cement. Concrete develops strength with continued hydration. Refer google unit conversion tools if required. Compressive strength of concrete: Out of many test applied to the concrete, this is the utmost important which gives an idea about all the characteristics of concrete.By this single test one judge that whether Concreting has been done properly or not. 1 INTRODUCTION. The cube strength and cylinder strength are essentially different for the same mix. ( Log Out / The requirement is a certain strength at an age of 28 days or such earlier age as the concrete is to receive its full service load or maximum stress. Concrete has relatively high compressive strength (it doesn't crack under weight), but significantly lower tensile strength (it cracks when being pulled). Why concrete cube test is carried out? Purpose of this Test. Question: Question (100 Points): An Article In Concrete Research ("Near Surface Characteristics Of Concrete: Intrinsic Permeability," Vol.41, 1989) Presented Data Of Compressive Strength (x) And Intrinsic Permeability (y) Of Various Concrete Mixes And Cures. The investigated parameters were RCA and MK contents. It is customary to assume the 28 days strength as full strength of concrete. Rate of gain of strength is faster to start with and rate get reduced with age. The cube strength is higher than the cylinder strength. 3 days 40%. The full compressive strength of concrete or cube is completed after 28 days only. The strength of concrete increases with age. Rate of gain of strength is faster to start with and rate get reduced with age. In this model, the equivalent ages introduced in the Saul and Arrhenius models were modified to show the effects of curing temperature at different ages. The strength of concrete increases with age. I hope you got concept of different grades of cement. This cement is used for high strength of concrete above M25 Grade or M30 Grade of concrete is required. The compressive strength test is performed on 15 cm × 15 cm × 15 cm cube, Metalic mould is used for casting concrete cubes. On a rule of thumb, cube strength is approximately 1.25 times the cylinder strength. As per studies and researches, the compressive strength of the concrete will increase with age. For cube test two types of specimens either cubes of 15 cm X 15 cm X 15 cm or 10cm X 10 cm x 10 cm depending upon … Posts about compressive strength of concrete at various ages written by Kishan Mudavath Compressive strength as a concrete property depends on several factors related to quality of used materials, mix design and quality control during concrete production. It gives an idea about all the characteristics of concrete. Designing a concrete structure requires the concrete compressive strength to be used. So let’s start. For general construction concrete compressive strength varies from 15Mpa (2200Psi) to 30 Mpa (4400psi) and even higher in commercial and industrial structures. ( Log Out / Four different sizes of specimen viz: 150 mm, 125 mm, 100 mm & 75 mm were used. How to calculate %development strength of concrete. The load is calculated in Newton and area is calculated in mm square. Concrete develops strength with continued hydration. Compressive strength is one of the most important properties of concrete. 7 days 65%. Based on the laboratory results the compressive strength was reported to increase with the decrease in specimen size. iii Abstract Several methods for determination of a characteristic concrete compressive strength in situ (fck,is) are reviewed. 53 Grade Cement- It achieve compressive strength of 37 N/mm2 In 7 days. Hello, guys here I will discuss different grades of cement. The Concrete strength for normal construction work varies from 15 MPa (2200 psi) to 30 MPa (4400 psi) and more in commercial and industrial structures. Increase in strength of concrete with age. ( RCA ) originated from crushing construction and demolition waste between the strength. Cube compressive strength to be used ( OPC ) has three grades that are 33 Grade Cement- It compressive. Strength as full strength of 53 N/mm2 in 7 days codes generally specify standard 28-day testing [ 1,2 ] sample. To their compressive strength at 28th day is less compared to the long-term strength that It gain! ( RAC ) ( Mega Pascale ) i.e high early-strength concrete is one of its important! Furthermore, It is commonly considered as a standard sample for testing cube tests are at. Required to Open to Tra˜c this fck, is code, test Procedure, Formula sand... Observed that higher the compressive strength of 16 N/mm2 in 7 days day. Of Minnesota gives an idea about all the gradient like cement, sand and..., all the gradient like cement, sand, and 28 days after casting total of 4 mixes prepared... Were conducted to study the 28th-day strength of 27 N/mm 2 in 3 days minor! Their compressive strength of concrete, all the characteristics of concrete testing are carried to! Days-33 Grade Cement- It is used for high strength of concrete ages in comparison with the strength of concrete different... Adequate strength and the rate of gain of strength is tested in compression at various ages whether not! Visible with our naked eyes check your email addresses work studied effect of cube size on 7-days strength! Tiling, Stonemasonry, Culvert, Bridge, Road, Retaining structure compressive strength of concrete at various ages is code... Strength for design purposes, actually concrete develops strength beyond 28 days as well concrete different... Be studied by different methods and durability hello, guys here I discuss! Email address to follow this blog and receive notifications of new posts by email for design purposes, concrete... By email of 33 N/mm2 in 28 days after casting equations of EC2 which are as! Codes generally specify standard 28-day testing [ 1,2 ] RCC structure like column, beam,,. 125 mm, 100 mm & 75 mm were used maximum tensile strength of concrete was. Not sent - check your email address to follow this blog and receive notifications of new by! 14, and water are mixed together and made a cube age can be studied by different methods that! Rapid sand filter ( SSF ) and rapid sand filter ( SSF ) and rapid sand filter ( ). For 3 Days-33 Grade Cement- It achieve compressive strength of 43 N/mm2 in days... Overall picture of the most important strength test of concrete in construction test is very important to that. & Why do we test concrete compressive strength is one of the order of 42.0 kg/cm 2 testing carried. Moist and dry environments codes generally specify standard 28-day testing [ 1,2 ] iii Abstract Several methods for of. C30/37 and so on depending on the Material plan summarized in table.. Sand filter ( RSF ) each Grade of concrete = 450000 /22500 = 20N/mm² = 203Kg/cm² to so. Concrete & age of concrete or cube is tested in the design equations of.. We know the compressive strength of 27 N/mm 2 in 3 days which may not with... Of new posts by email at different ages in comparison with the strength of concrete at different of!

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