test of concrete strength

2007-01-13 6:32 am

there are three tests for testing the strength of concrete

1. cube compression test
2. rebound hammer test
3. coring sample and compression test

can u explain these three methods to me? what are they and the procedure.
if u know anyone of them, u can answer too. i just want to know the details.

i hope i can get your own answer, but not copying the stuff on internet, i think who are studying civil engineering or architecture must know that.

thank u very much.

回答 (1)

Chi Sun

2007-01-13 9:00 am

✔ 最佳答案

Here are my own wordings:

1. Cube compression test: get the wet sample from construction site, pour to a square cube steel mould of 150mm long, height and width. Transport these to the laboratory and compress them with a compression machine when they dry, usually after 7 days or 28 days. Reading give out when the concrete breaks. Destructive.

2. Rebound hammer test: do for vertical elements, that is, columns and walls. Do it when the concrete have been cast for 28 or 90 days to check the compression strength by hitting the wall or column by the rebound hammer, reading immediately shown on the rebound hammer. Non-destructive.

3. Coring sample and compression test: drill out a cylinder from dry concrete from casted concrete in the construction site and transport to the laboratory and compress them with a compression machine when they dry, usually after 7 days or 28 days. Reading give out when the concrete breaks. Destructive.

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