基于正交分析的粒化高炉矿渣代砂混凝土冻融试验

Freezing and thawing cycle experiment of granulated blast furnace slag concrete based on orthogonal analysis

为了研究粒化高炉矿渣代砂混凝土的冻融性能,通过快冻法试验,在正交设计的基础上,利用极差分析法来评价代砂率、冻融循环和水胶比对混凝土抗压强度和质量损失率的影响程度。结果表明:3个影响指标对混凝土抗压强度的影响程度为水胶比>冻融循环>代砂率,而对质量损失率的影响程度为水胶比>代砂率>冻融循环;掺粒化高炉矿渣可以很好的提高混凝土的抗压强度,且质量损失率和普通混凝土相差无几;100%代砂率和水胶比为0.25的粒化高炉矿渣混凝土具有很好的抗压强度和质量损失率,可以很好的抵抗冻融破坏。

In order to study the freeze-thaw performance of granulated blast furnace slag concrete.By the fast freezing method, on the basis of orthogonal design, range analysis is used to evaluate the effect degree that the replaced sand ratio, the freezeing-thawing cycle and W/B ratio influence the compressive strength and the mass loss of concrete.Results show that the effect degree of the three influencing factors of the compressive strength is W/B ratio〉freezeing-thawing cycle〉replaced sand ratio, and the effect degree of the three influencing factors of the mass loss is W/B ratio〉replaced sand ratio〉freeze-thaw cycle.Mixed granulation blast furnace slag can well improve the compressive strength of concrete, and the mass loss rate and ordinary concrete are very much. 100% replaced sand ratio and 0.25 W/C ratio of granulated blast furnace slag concrete has good compressive strength and mass loss rate,and can very good resistance to freezeing-thawing damage.