不同粗细骨料组合下的混凝土性能研究

Research on the concrete properties with different coarse and fine aggregates

选取了10种不同性质的粗细骨料组合,在相同的配合比条件下进行了混凝土强度、变形及热学性能试验,并对试验结果进行了比较分析。研究结果表明,不同骨料组合下混凝土的性能有一定差异,这种差异既和骨料的特性有关,也和骨料与砂浆间的界面特性有关。混凝土的弹性模量、线膨胀系数和导温系数主要决定于粗骨料的性质,而粗、细骨料的强度对混凝土强度影响不大。

Experiments of concrete with 10 different coarse and fine aggregates are made in this paper.Concrete strength,deformation and thermal properties of concrete are measured at the same mix proportion.Experimental results are analyzed both with mechanical and statistical way.It is shown that concrete properties is influenced by properties of coarse and fine aggregates,also the interface between aggregates and cement pasted.The elastic modulus,linear expansion coefficient and thermal diffusivity of concrete mainly depends on coarse aggregate,however,aggregate strength has almost no influence to normal concrete strength.