粉煤灰微珠-沙漠砂陶粒混凝土力学性能试验  

Experimental study on mechanical properties of fly ash cenospheres-desert sand ceramsite concrete

作　　者：许建疆 郭军林[1,2] 甘丹 袁康[1,3] 何明胜[1,3] XU Jianjiang;GUO Junlin;GAN Dan;YUAN Kang;HE Mingsheng(College of Water Conservancy&Architectural Engineering,Shihezi University,Shihezi 832000,China;College of Civil Engineering,Chongqing University,Chongqing 400045,China;Xinjiang Production&Construction Groups Engineering Laboratory for Seismic and Energy-Saving Building in High Earthquake Intensity and Cold Zone,Shihezi 832000,China)

机构地区：[1]石河子大学水利建筑工程学院,石河子832000 [2]重庆大学土木工程学院,重庆400045 [3]新疆兵团高烈度寒区建筑抗震节能技术工程实验室,石河子832000

出　　处：《复合材料学报》2024年第1期348-360,共13页Acta Materiae Compositae Sinica

基　　金：兵团重点领域科技攻关项目(2021AB027);石河子大学青年创新人才培育项目(CXPY202014)。

摘　　要：以沙漠砂(DS)和粉煤灰微珠(FAC)部分代替河砂,并掺入聚合物乳液(PL)制备新型陶粒混凝土−粉煤灰微珠-沙漠砂陶粒混凝土(FDCC)。通过单因素变量研究DS替代率、FAC替代率和PL掺量对FDCC工作性能及力学性能影响规律,并建立了FDCC抗压强度预测模型。研究结果表明:DS和FAC可部分替代河砂用于制备轻骨料混凝土。FDCC表观密度与抗压强度呈线性关系,坍落度随DS替代率的增加而降低,随FAC替代率和PL掺量的增加而增加。FDCC抗压强度随DS替代率增加先上升后下降,随FAC替代率增加先下降后上升。DS、FAC最优替代率及PL最优掺量分别为20vol%、30vol%和1wt%。FDCC劈裂抗拉强度随DS替代率、FAC替代率和PL掺量增加而降低。DS和FAC的掺入能促进水化产物生成,对FDCC混凝土微观结构有利。A new ceramsite concrete,fly ash cenosphere-desert sand ceramsite concrete(FDCC),was prepared using desert sand(DS)and fly ash cenosphere(FAC)as a partial replacement for river sand and mixed with polymer(PL).The effects of the DS replacement rate,FAC replacement rate and PL admixture on the workability and mechanical properties of the FDCC were investigated by means of univariate variables,and prediction models for compressive strength and splitting tensile strength of the FDCC were established.The results show that the DS and FAC can partly replace river sand to prepare the lightweight aggregate concrete.The apparent density of the FDCC is linearly related to the compressive strength,the slump decreases with the DS replacement rate increasing and increases with the FAC replacement rate and the PL admixture increasing.The compressive strength of the FDCC increases and then decreases with the DS replacement rate increasing,and decreases then increases with the FAC replacement rate increasing.The optimal DS and FAC replacement rates and the optimal PL admixture are 20vol%,30vol%and 1wt%,respectively.The splitting tensile strength of the FDCC decreases with the DS and FAC replacement rates and PL admixture increasing.The incorporation of the DS and FAC promotes the formation of hydration products and is beneficial to the microstructure of FDCC concrete.

关 键 词：沙漠砂 粉煤灰微珠 聚合物乳液 陶粒混凝土 力学性能 

分 类 号：TU502[建筑科学—建筑技术科学] TB332[一般工业技术—材料科学与工程]