养护条件对含SAP高性能水泥基材料强度的影响  

Effect of curing methods on the strength of high performance cement-based materials with SAP

作　　者：马先伟 刘剑辉[3] 禹新 王继娜 李志新 牛季收 MA Xianwei;LIU Jianhui;YU Xin;WANG Jina;LI Zhixin;NIU Jishou(College of Civil and Transport Engineering,Henan University of Urban Construction,Pingdingshan 467036,China;College of Civil Engineering,Hunan University,Changsha 410082,China;College of Civil Engineering,Zhongyuan University of Technology,Zhengzhou 450007,China)

机构地区：[1]河南城建学院土木与交通工程学院办公室,河南平顶山467036 [2]河南城建学院土木与交通工程学院,河南平顶山467036 [3]湖南大学土木工程学院,湖南长沙410082 [4]中原工学院建筑工程学院,河南郑州450007

出　　处：《混凝土》2020年第4期19-22,28,共5页Concrete

基　　金：国家自然基金项目:SAP在超高性能混凝土中释水和内养护机理(U1504508);河南省高等学校重点项目(16A560014)。

摘　　要：高性能水泥基材料的低水胶比使胶凝材料水化非常有限,而外界条件变化会影响体系中含水量及性能发展,这在超高性能混凝土更为明显。采用自然养护、水养、密封养护以及后期短暂水养护,研究了养护方式对水胶比为0.18~0.24的高性能水泥基材料强度的影响,并进一步分析SAP粒径的影响。结果发现:SAP有效消除SAP孔对相同初始水胶比砂浆强度的不利影响,尤其在自然养护下;后期遇水时失水SAP重新吸水,可以弥补早期水养时间不足的缺陷,保证强度进一步增加,且SAP掺量越大,弥补效果越明显。因此,低水胶比水泥基材料早期水养时间较短时,后期短暂的水养非常必要,尤其掺入SAP时。The hydration of high performance cement-based materials,especially with very low water-to-binder ratio,is very limited.Change in external condition will affect its content of water and later properties.This effect is more serious for ultra-high performance concrete.Natural curing,water curing,sealed curing and short later-stage water curing was adopted.The effect of the four curing modes on the strength of high performance cement-based materials with water-to-binder ratio from 0.18 to 0.24 was studied,and the effect of particle size of SAP was also analyzed.The results show that SAP effectively eliminates the adverse effect of SAP hole on the strength of mortar with the same initial water-to-cement ratio,especially under natural curing.When cement-based materials encounter water in the later stage,SAP absorbed water from the outside again make up for the deficiency of insufficient water curing time in the early stage;the strength is also further increased;higher SAP amount can have a more obvious compensation effect.Therefore,if curing time at the early stage is very short,keeping a proper period of water curing at the later stage is very beneficial for cement-based materials with low water-to-binder ratio,especially mixed with SAP.

关 键 词：SAP 高性能水泥基材料 超高性能混凝土 养护 

分 类 号：TU528.064[建筑科学—建筑技术科学]