![]() The higher the flexural strength values, the better flexibility and the less tendency of shrinkage cracking. The results of this test provide better predictability of the plaster’s ability to withstand tensile stresses. ![]() New concepts and better quality tests for cement plaster:įrom the author's point of view, the flexural strength test is a more important and more accurate test for measuring the quality of the cement plaster compared to the compressive strength test. The plaster that has less cracking ability and higher adhesion to the walls must be preferred even if its compressive strength corresponds to the minimum required in the category III (CS III) which it is 3.5 MPa.Ĭompressive strength greater than 7.5 MPa should not be specified except in some special cases that require special types of cement plaster. This negative effect may extend for months after the application of the plaster material.įrom the author's point of view, if the compressive strength of the cement plaster must be included in the project specifications, the category ( CS III) can be specified “according to the European standard EN 998-1” for general purpose plastering works "when there are no special requirements" (which represent more than 95 % of cement plaster work).Ī cement plaster that gives higher compressive strength should not be preferred over the plaster that has less compressive strength. The amount of fines passing 75 microns sieve should not be more than 5% for natural sand and 10% for crushed sand.įrom the above we can conclude that the increase in the compressive strength of cement plaster by increasing the amount of cement may have negative impacts on the quality of the plaster, as the increase in the amount of cement increases the possibility of plastic and dry shrinkage cracks. The presence of clay significantly increases shrinkage-induced stress and may lead to the occurrence of deep and wide cracks in the plaster.
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