粉煤灰品质及掺量对水工混凝土耐久性的影响研究

Study on Influence of Fly Ash Quality and Content on Durability of Hydraulic Concrete

试验探讨了F·Ⅰ级和F·Ⅱ级两种品质粉煤灰以及10%、20%、30%、40%和50%五种粉煤灰掺量,对水工混凝土抗渗性能、工作性和抗压强度的影响作用。研究表明,相同配合比时,F·Ⅰ级优于F·Ⅱ级粉煤灰配制的混凝土性能;混凝土抗渗性、坍落度和后期抗压强度随着粉煤灰掺量的提高表现出先上升后下降的变化趋势,结合试验数据确定最优掺量20%。

The effects of two kinds of grade F·I and grade F·II fly ash and five kinds of fly ash content of 10%,20%,30%,40%and 50%on impermability,workability and compressive strength of hydraulic concrete were investigated.The results show that grade F·I is superior to grade F·II fly ash in concrete performance with the same mixture ratio.The permeability resistance,slump and late compressive strength of concrete show a trend of first increase and then decrease with the increase of fly ash content,and the optimal content of 20%is determined based on the test data.