FIELD TESTS ON AGGREGATE

google.com, pub-4772169091731741, DIRECT, f08c47fec0942fa0

How To Check If Stone Chips Are Good? 

The visual tests or field tests for Coarse aggregate, that is stone chips are very limited though there are many laboratory tests are available. Mainly the following things are observed as for Field Test:-

1.    The Stone Chips are to be well graded to increase the mechanical interlocking between them. 

2.    Stone Chips should be Angular as far as possible and be porous. 

3.    The Stone Chips should not be flaky and elongated. 

4.    The Stone Chips should not contain organic and other impurities, as only 5% of clay content in concrete can reduce the strength of the concrete as much as 20%.

Field Test on Sand

How To Check If  Sand Is Good? ==>

*GOLDEN YELLOW SAND, A SIGN OF GOOD QUALITY SAND.

The following tests should be performed to determine the quality of Sand:-

1.    The Sand should be free from organic impurities and mineral salts, The maximum permissible quantity of organic impurities should be restricted to 5%. 

2.    The Sand should be of Golden Yellow colour. 

3.    The Sand particles should be sharp and angular to increase the interlocking property between the sand particles. 

4.    The sand should coarse for Concreting and medium sand may be allowed in brickwork and is preferable for plastering works.

Field Tests of Cement

How To Check If Cement Is Good? ==>

The following field tests should be done to determine whether the cement is of good quality:

1.    The cement should be of Greenish Gray colour for Ordinary Portland Cement, and Blackish Gray colour for Portland Pozzolana Cement and Whitish Gray colour for Portland Slag Cement.

2.     There should not be any hard lumps on cement, the cement should be finely powdered. If cement contains hard lumps, then it must be rejected. 

3.    The cement, when rubbed between fingers, should feel smooth, it should not feel granular. If it is granular then it means adulteration with sand. 

4.    A cement paste should feel sticky in between fingers. 

5.    When the hand is dipped into a heap or into a bag of cement, it should feel cool, not warm. 

6.    If a hand full of cement is thrown into a bucket of water, the cement should sink, not float as the Specific Gravity of Cement is greater than that of Water. 

7.    If a thick cement paste made on glass and immersed in water should set, not crack.

<script data-ad-client="ca-pub-4772169091731741" async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>