现场混凝土坍落度和抗压强度离散性的影响因素分析

运用正交设计法对影响CFG桩混凝土坍落度和抗压强度的水胶比、砂率、拌合物温度、养护温度以及砂子含水率等控制因素进行了试验研究,采用极差分析和方差分析方法定量分析了这几个主要控制因素对搅拌站现场混凝土拌合物坍落度和抗压强度的影响程度。研究发现,砂子含水率是影响现场混凝土坍落度的主要因素,拌合物的出机温度和环境温度成为CFG桩现场混凝土抗压强度离散性的显著影响因素。

Analysis of the Influential Factors of the Slump and the Discreteness of the Compressive Strength of Site-Mixed Concrete

By the orthogonal design method,a test study is made,in the paper,of the ratio of water to binder,sand ratio,the temperature of the mixed materials,the curing temperature,and the sand moisture,all of which are referred to as the control factors affecting the slump and compressive strength of the concrete of CFG piles.These control factors are quantitatively analyzed,by the range analysis and variance analysis methods,to find out to what extent these factors will affect the the slump and compressive strength of the site-mixed concrete.The research shows that sand moisture is the main influential factor that affects the slump of the site-mixed concrete while the temperature of the concrete that has just been turned out and the environmental temperature significantly influence the discreteness of the compressive strength of the concrete of CFG piles.