Impact of Rolled and Crushed Aggregate with Natural Pozzolan on the Behavior of HPC

Abstract

High performance concrete (HPC) has several advantages in building construction that cannot be achieved using conventional concrete in terms of strength durability, resistance to chemical attack, and workability of high performance concrete are high. The introduction of fillers and additives contributed to the improvement of high-performance concrete (HPC), other parameters also influence the performance of these HPCs, coarse aggregate fraction is known to strongly influence both fresh and hardened concrete’s properties. Consequently, selection of both content and particle size distribution for (HPC) mixture is an important issue regarding the predicted performance of concrete. For to make concrete more improvement , the porosity of the granular skeleton as well as the rheology of our HPC, 3/8 fraction of rolled gravel with smooth and rounded surfaces was introduced, in substitution for the crushed gravel of the same fraction , by testing various combinations of fractions 3/8 of rolled gravel and fraction 8/15 of crushed gravel in the present study, and based on previous results obtained the combinations 35,40 and 45% fraction 3/8 of rolled gravel and 65 , 60 and 55% fraction 8/15 of crushed gravel (binary granular system) respectively, gives a minimal porosity . Super plasticizer and four percentages of pozzolan were experimented. Compressive strength function of coarse aggregate was determined at 7, 14 and 28 days. Results have revealed that the mixtures with modified granule size distribution system ,1.5% of superplasticizer and 5% by weight of pozzolan allow an improvement in the compressive strength of 35.1% relative to the control concrete.

Effect of Natural Pozzolana on Physical and Mechanical Properties of Concrete

“…That is through using as a partial substitution of cement by NP to reduce cement consumption and at the same time improve concrete performance [30][31][32][33][34][35][36][37][38]. Besides these, the employment of NP is beneficial in the reduction of deformations while improving the compressive strength of concrete [14,30,35,[39][40][41][42][43][44][45][46][47][48][49][50][51][52][53]. Also, NP can improve concrete resistance to chloride ion penetration which is directly indicated by electric resistivity and durability of concrete by reducing shrinkage cracks and significantly reducing crack width of concrete matrices [1,12,[54][55][56].…”