水泥混凝土宏观性能与孔结构量化关系模型

Quantitative relation model between macro performance and pore structure of cement concrete

为建立水泥混凝土宏观与微观性能之间的量化关系,以交通基础设施经常承受的干湿循环、氯盐侵蚀、碳化和冻融循环4种劣化因素为对象,设计了模拟自然环境的多种劣化因素综合作用的水泥混凝土室内耐久性试验方法。分别测试混凝土的宏观和微观性能,提出相对变化率概念,并给出相对变化率指标的计算方法。运用层次分析法、归一化方法以及灰色关联理论,计算宏微观性能关联度及孔结构对宏观性能的影响权重。最终建立了微观孔结构特征变化与宏观性能变化之间的量化关系模型。通过测试混凝土微观孔结构参数变化,运用该模型,可以推算出混凝土宏观性能的劣化程度。

To find the relationship between macro and micro performance of cement concrete, an experiment for tes- ting indoor durability of cement concrete was designed. It simulated the comprehensive effects of multiple deterioration elements in a natural environment. There are four deterioration factors that are usually borne by transportation infra- structure ： dry and wet cycling, chlorine salt erosion, carbonization, and freeze and thaw cycling. The micro and mac- ro performance indexes were tested separately, the term of relative change rate was put forward and the calculation method for the index of the relative change rate was given. Based on the analytic hierarchy process （ AHP）, normaliza- tion and grey correlation theory, the degree of association between micro and macro performance, and the influence weight of pore structure on macro performance, were calculated. Finally, a quantitative relation model was established between macro performance change and micro pore structure performance change. The variability in macro perform- ance of concrete can be calculated from the variable quantity of micro parameters according to the model.