基于地铁工程的大体积混凝土配合比优化

Optimization of mix proportion of mass concrete based on metro engineering

研究胶凝材料用量、胶水比和矿物掺合料对混凝土工作性和力学性能的影响,对其配合比进行优化后以实现矿物掺合料的最大化工程应用。采用线性回归拟合方法,依次考虑不同矿物掺合料用量混凝土的抗压强度和原材料成本,保证混凝土在不同强度等级下可以满足力学性能,工作性能以及原材料最低成本要求。结果表明,混凝土的用水量-胶凝材料用量以及抗压强度-胶凝材料用量/胶水比之间均表现出较好的线性关系;配合比优化后的原材料成本较初始配合比最大降幅达27.9%,优化后的混凝土配合比具有很好的工程适用性和经济性,有效地扩大了矿物掺合料的使用范围。

Researching the effect of cementitious material content,cement/water ratio and mineral admixtures on workability and mechanical properties of concrete,and realize the optimization of the mix proportion of the mineral admixture to the maximum engineering application.By using linear regression method,followed by consideration of the concrete compressive strength,workability and the cost of raw materials,which can meet the mechanical properties as well as raw materials for the lowest cost requirements in different strength grades of concrete.It is found that the water consumption-cementitious materials content and compressive strength-cementitious materials content or cement/water ratio of concrete all showed good linear relationship;compared with the initial proportion of concrete.the largest decline in the cost of raw materials up by 27.9% after optimization of mix proportion.Moreover,the optimum mix proportion of the concrete can bring a good engineering applicability and economy,and effectively expand the scope of the use of the mineral admixture.