天然和人工骨料水工混凝土的配制及性能研究

Study on Preparation and Properties of Hydraulic Concrete with Natural and Artificial Aggregate

分别选择天然砂砾石、花岗岩人工骨料开展了C30、C20水工混凝土配合比设计及性能试验,研究了骨料品种对相同强度等级混凝土拌和物性能、力学性能、绝热温升、耐久性能等方面的影响。结果表明:采用天然骨料或人工骨料,以绝对体积法设计、制备的C20W6F300、C30W6F350混凝土的强度、抗渗等级、抗冻等级均能满足设计指标要求;当强度等级相同时,两种骨料制备的混凝土拌和物性能相近,人工骨料混凝土的力学性能、抗裂性、抗冻性均优于天然骨料混凝土,但天然骨料混凝土的渗水高度小于人工骨料混凝土,C20人工骨料混凝土的绝热温升值略高于天然骨料混凝土,但两者的平均温升值相近。

Natural sand gravel and granite artificial aggregates were selected respectively to carry out C30 and C20 hydraulic concrete mix proportion and performance tests,and the influences of aggregate variety on the mixture properties,mechanical properties,adiabatic temperature rise and durability performance of concrete of the same strength grade were studied.The results show that C20W6F300 and C30W6F350 concrete designed and prepared by the absolute volume method using natural aggregates or artificial aggregates can meet the requirements of design technical indicators in terms of strength,impermeability and frost resistance.The properties of the concrete mixture prepared from the 2 aggregates are similar.The mechanical properties and frost resistance of the artificial aggregate concrete are better than those of the natural aggregate concrete,but the water seepage height of the natural aggregate concrete is smaller than that of the artificial aggregate concrete,and the adiabatic temperature rise of artificial aggregate C20 concrete is slightly higher than that of natural aggregate C20 concrete,but the average temperature rise of the two is similar.