高速公路施工中高性能机制砂混凝土的应用研究

发布时间：2019-04-03 08:53

【摘要】：以C60D为基础的机制砂混凝土为对象,研究了石粉含量、水胶比、砂率、矿粉和硅粉含量配比对混凝土性能的影响规律,并在确定最佳配合比的基础上对高性能机制砂混凝土的力学性能和工作性能进行了验证性分析。研究结果表明:当水胶比和砂率分别为0.3和0.37,矿粉和硅粉分别为80 kg/m3和30 kg/m3,采用复合掺配获得的机制砂混凝土具有最优的力学性能和工作性能;随石粉含量的增加,以7 d龄期为界,在界限早期的机制砂混凝土收缩性随着石粉含量增加而不断上升,当超过7 d龄期后,混凝土的收缩率随着石粉含量的增加呈现下降趋势;石粉掺和料的作用,提高了混凝土的密实性,能有效避免混凝土的碳化反应,从而进一步提高了机制砂混凝土的抗碳化能力。
[Abstract]:Taking C60D-based mechanical sand concrete as an object, the effects of stone powder content, water-binder ratio, sand ratio, mineral powder and silica content ratio on the performance of concrete were studied. On the basis of determining the optimum mix ratio, the mechanical and working properties of high performance mechanical sand concrete are analyzed. The results show that when the ratio of water to binder and sand ratio are 0.3,0.37, 80 kg/m3 and 30 kg/m3, respectively, the mechanical properties and working properties of the mechanical sand concrete prepared by composite mixing have the best mechanical properties and working properties. With the increase of the content of stone powder, the shrinkage of the mechanical sand concrete at the early stage of the boundary increases with the increase of the stone powder content, and when the age is over 7 days, the shrinkage of the mechanical sand concrete increases with the increase of the stone powder content. The shrinkage of concrete decreases with the increase of stone powder content. The effect of stone powder admixture can improve the compactness of concrete, effectively avoid the carbonation reaction of concrete, and further improve the carbonation resistance of mechanical sand concrete.
【作者单位】：重庆工程职业技术学院;昆明理工大学建筑工程学院;
【基金】：国家自然科学基金(51408283)
【分类号】：U414;U415

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