What is Gap Graded Aggregate? Generally we use well graded aggregate or continuous graded aggregate, which means representation of all the standard particle sizes in certain proportion. Assumption made in well gradation is that voids created by the higher size of aggregate will be filled-up by immediate next lower size of aggregate and again some … Read more
The volume increase of fine aggregate due to presence of moisture content is known as bulking. Fine sand bulks more as compared to coarse sand. Extremely fine sand particularly the manufactured fine aggregate bulks as much as about 40%. Note: Fine aggregate do not show any bulking when it is absolutely dry or completely saturated. … Read more
Objective The tests are required to determine the strength of concrete and therefore its suitability for the job. Reference Standards IS : 516-1959 – Methods of tests for strength of concrete. Equipment & Apparatus Compression testing machine (2000 KN) Curing tank/Accelerated curing tank Balance (0-10 Kg) Procedure Representative samples of concrete shall be taken and … Read more
Objective Normally, the strength of concrete is found out after 7 days and 28 days. For some construction activities, it may be too late and need to know the strength earlier. Reference Standards IS: 9013-1978-Method of making, curing and determining compressive strength of accelerated cured concrete test specimen. Equipment & Apparatus Accelerated curing tank Compression Testing Machine … Read more
Objective For determination of relative quantity of mixing water that will bleed from a sample of freshly mixed concrete. Reference Standard IS : 9103-1999 – Method of sampling and analysis of concrete. Equipment & Apparatus Cylindrical measure Tamping Bar Pipette Graduated Jar Procedure The container is filled with concrete up to a height of 250±3 … Read more
Objective For determination of consistency of concrete where the nominal maximum size of aggregate does not exceed 38 mm using flow table apparatus. Reference Standard IS : 1199 – 1959 – Method of sampling and analysis of concrete. Equipment & Apparatus Flow table Procedure Before commencing test, the table top and inside of the mould … Read more
Objective For determination of consistency of concrete where the nominal maximum size of aggregate does not exceed 38 mm using compacting factor test apparatus. Reference Standards IS: 1199 – 1959 – Method of sampling and analysis of concrete. Equipment & Apparatus Compacting factor apparatus. Procedure The sample of concrete to be tested is placed … Read more
Object For determination of consistency of concrete where the nominal maximum size of aggregate does not exceed 38 mm using slump test apparatus. Reference Standards IS : 1199 – 1959 – Method of sampling and analysis of concrete. Equipment & Apparatus Slump cone Tamping rod Procedure The internal surface of the mould is thoroughly cleaned … Read more
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