Study on the Influence of Elongated and Flaky Particles on the Performance of High Strength Concrete
From the perspective of coarse aggregate elongated and flaky particles,the effect of its content and particle size on the properties of high strength concrete was investigated.The concrete was prepared with four kinds of coarse aggregates with 5％,15％and 25％of the content of elongated and flaky particles,and the working,mechanical and durability properties of the concrete were investigated,and three kinds of elongated and flaky particles in the size range of 5-10 mm,10-16 mm and 16-20 mm were selected to investigate the influence of the size on the performance of the concrete.The results show that the increase in the content of elongated and flaky particles,high-strength concrete ease and pumping performance deterioration,concrete compressive strength decreased,concrete shrinkage increased,and the durability of high-strength concrete is unfavourable;concrete mix slump and expansion,hardened concrete compressive strength at various ages with the increase in the size of the elongated and flaky particles in the coarse aggregate and reduce.Considering the influence of elongated and flaky particles on the performance of high-strength concrete,it is suggested to control the content of elongated and flaky particles not more than 5％;at the same time,when calculating the content of elongated and flaky particles,it is necessary to multiply the influence coefficients of elongated and flaky particles of different particle sizes on the basis of the standard method of calculation,so as to achieve a better control on the particle shape of the coarse aggregates.
coarse aggregateselongated and flaky particleshigh strength concreteperformance influence
万方数据
维普
