组合骨料对全级配混凝土性能影响研究

Study on the influence of composite aggregate on the performance of fully-graded concrete

对比研究了全砂岩骨料、砂岩-大理岩组合骨料对全级配混凝土性能的影响,研究结果表明:综合全级配混凝土的力学、变形、耐久等性能试验结果,砂岩-大理岩组合骨料全级配混凝土综合性能更优;同等条件下,与全砂岩骨料相比,砂岩-大理岩组合骨料能提高全级配混凝土的抗压强度、降低混凝土的干缩和自生体积变形,并且其抗渗性能和抗冻性能也可以达到W16和F300。

The effect of sandstone aggregate and sandstone-marble composite aggregate on the performance of fully-graded concrete were studied.The results show that the comprehensive performance of fully-graded concrete with sandstone-marble composite aggregate is better than that with sandstone aggregate full-graded concrete according to the mechanical,deformation and durability test results.Under the same conditions,compared with the sandstone aggregate,the sandstone-marble composite aggregate can improve the compressive strength of the fully-graded concrete,reduce the dry shrinkage and autogenous volume deformation of concrete,and its impermeability and frost resistance can also reach W16 and F300.