The soundness of cement test Changes of volume after completion of mold cast. After casting change of volume of molded cement test, this changing call soundness of cement test.
Also read: IS CODE FOR CIVIL ENGINEER
Two methods may determine the soundness of cement. as per below
To determine the Cement Soundness test use Le-Chatelier method
The test shall conform to IS: 5514-1969*.
Also read : CORE CUTTER METHOD
Water bath capable of containing immersed Le-Chatelier molds with specimens and of raising their temperature from 27 ± 2°C to boiling in 27 ± 3 minutes. From IS Code 4031 Part 3 Cl 5.1.4
Calculate the mean of two values to the nearest 0.5 mm to represent the expansion of cement. From IS Code 4031 Part 3 Cl 5.3
This must not exceed 10mm for ordinary, rigid hardening & low heat Portland cement. If in case the expansion is more than 10mm as tested above, the cement is said to be unsound.
Also Read: LAB TEST ON AGGREGATES AT SITE
To determine the Cement Soundness test use Autoclave method
Graduated glass cylinders of 150 ml capacity shall be used, The permissible variation on these cylinders shall be plus or minus one milliliter.
The main graduation lines of the cylinders shall be in circles and shall be numbered.
The east graduations shall extend at least one-seventh of the way around, and intermediate graduations shall extend at least one-fifth of the way around the cylinder. The graduation lines may be omitted for the lowest 5 mI. From IS Code 4031 Part 3 Cl 6.1.3
Molds of 25 X 25 mm size and 282 mm internal length and other accessories conforming to IS: 10086-1982
Also Read: PROCEDURE FOR RCC CONCRETE
The difference in lengths of the test specimen before and after autoclaving shall be calculated to the nearest 0’01 percent of the effective gauge length which is the length between the innermost points of the metal inserts used as reference points and shall be reported as the autoclave expansion of the cement. A contraction ( negative expansion) shall be indicated by prefixing a minus sign to the percentage expansion reported.From IS Code 4031 Part 3 Cl 6.3
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