全沙漠砂混凝土的动弹性模量研究  

Research on the Dynamic Elastic Modulus of Full Desert Sand Concrete

作　　者：连泽立 赵文娟[2] 杨建森[1] 

机构地区：[1]宁夏大学土木与水利工程学院,宁夏银川750021 [2]宁夏大学建筑学院,宁夏银川750021

出　　处：《混凝土世界》2024年第11期32-37,共6页China Concrete

基　　金：国家自然科学基金资助项目(52368038);宁夏高等学校一流学科建设项目(NXYLXK2021A03)

摘　　要：为了考察细骨料为沙漠砂的全沙漠砂混凝土(Full Desert Sand Concrete,FDSC)的抗变形能力,本文研究了不同水胶比下FDSC的动弹性模量,运用回归分析建立了FDSC动弹性模量与水胶比的相关性模型。结果表明:采用合理的配合比可以制备和易性良好的FDSC;FDSC与普通混凝土具有相近的动弹性模量,细骨料粒度变细以及颗粒增多,并没有降低FDSC的动弹性模量;沙漠砂具有数量更多的小中心质效应,分散和均匀了混凝土中胶凝材料浆体,使水化产物分布更加均匀,骨料界面过渡区连结更加牢固,混凝土基体结构更加致密,故FDSC的抗变形能力与普通混凝土相近;FDSC的动弹性模量(y)与水胶比(x)符合y=-32.695x+58.128函数关系的模型,且在显著性水平α=0.01下相关性显著,据此可以估算FDSC的动弹性模量。To investigate the deformation resistance of full desert sand concrete(FDSC)with desert sand as the sole fine aggregate,this paper mainly researched the dynamic elastic modulus of FDSC under different water-cement ratios,and established a numerical correlation model between the dynamic elastic modulus of FDSC and the water-cement ratio by regression analysis.The results indicate that FDSC with good workability can be prepared by using an appropriate mix proportion;FDSC exhibits a similar dynamic elastic modulus with ordinary concrete.The finer particle size and increased number of fine aggregates do not reduce the dynamic elastic modulus of FDSC;desert sand has a more significant micro-aggregate effect,which disperses and homogenizes the cementitious materials in the concrete,and it also leads to a more uniform distribution of hydration products,a stronger bonding in the aggregate interfacial transition zone,and a denser concrete matrix structure.Therefore,the deformation resistance of FDSC is similar to that of ordinary concrete.The dynamic elastic modulus(y)of FDSC and the water-cement ratio(x)follow the function modely=-32.695x+58.128,showing a significant correlation at the 0.01 level.According to this model,the dynamic elastic modulus of FDSC can be estimated based on the water-cement ratio.

关 键 词：全沙漠砂混凝土 动弹性模量 水胶比 沙漠砂 

分 类 号：TU528[建筑科学—建筑技术科学]