EFFECT OF CEMENT TYPE IN CONCRETE MIX DESIGN BASED ON EXPERIMENTAL DATABASE

Quality of cement is evaluated via group of tests. The most important, and close to understanding, is the compressive strength test. Recently, Egyptian standards adopted the European standards EN-196 and EN-197 for specifying and evaluating quality of cements. This resulted in new types of cements to replace the types that local construction companies used to apply for decades. Many doubts appeared about whether the rules applied for concrete mix proportioning are still valid. In the current research, an experimental investigation of concrete properties is made using two of the locally most common types of cements CEM I 32.5 R & CEM I 42.5 N. Slump, compressive strength, rebound number and ultrasonic pulse velocities were investigated for 64 mixes. The current study represents a comparative investigation, experimental and numerical, of the effect of different parameters on evaluation of compressive strength. The main parameters were type of cement, cement content, water content, and fine/coarse aggregate ratio. Data base was established for the mix proportions and corresponding properties. Regression technique is developed in the present work to simulate the concrete slump and concrete compressive strength for different mix proportions at different ages for the two types of cement and thenpredict the concrete behavior for different mix proportions at ages rather than those investigated in the experimental work.

Keywords:

Cement type , Sand type , Strength , Modeling , Slump