Properties of new cements produced in egypt as per es 4756 2005

الملخص EN

Cement-being a vital constituent in the construction industry -must meet international standards to verify quality and maintain product uniformity.

On June 2005, the Egyptian Organization for Standardization & Quality (EOS) issued new standard for cement ES 4756 / 2005 based on European Standard EN 197 / 2000 and as a result, a number of former Egyptian Standards were withdrawn.

This paper aims to provide information on the types and properties of cements specified in he new standard and already produced in the market to assist the designers and users to choose the same cement performance as before and to make the transition to the new standard ES 4756/2005 as easily as possible.

To accomplish this task, a total number of 380 samples- collected during the last six months from 6 companies - comprising 7 types of cement ( CEM I 32,5 N, CEM I 32,5 R, SRC 32,5 R, CEM II B-S 32,5 N, CEM I 42,5 N, CEM I 42,5 R, SRC 42,5 N) mostly used in the construction industry has been tested for compressive strength.

In addition, a comparative study was carried out using CEM I 32,5 R, CEM I 32,5 N, sulfate resisting cement (SRC) 32,5 R, CEM II B-S 32,5 N, CEM I 42,5 N, CEM I 42,5 R and CEM I 52,5 N cements to evaluate the difference between the old withdrawn standard ES 373 and its relevant standards and the new standard ES4756 and its relevance upon mechanical properties of the resulting mortar specimens.

Strength development of cement mortar was determined at 2, 3,7, 28, 56 and 90 days respectively.

Conformity of CEM I 42,5 N is also included.

Test results revealed that all the cement types tested comply with the requirements for the Egyptian standards 4756 for compressive strength at 2 or 7 and 28 days.

The results of the comparative study clearly indicated that the cement produced according to the new standard ES 4756 are meeting the strength requirements stated in the old withdrawn standard ES 373 and it's relevant.

More research is still needed to explore the durability performance of the new cements.