膨胀剂对混凝土变形性能的影响  

Effects of Different Expansive Agents on Mass Concrete Deformation Property

作　　者：高培伟[1] 卢小琳[1] 唐明述[2] 

机构地区：[1]南京航空航天大学航空宇航学院,南京210016 [2]南京工业大学材料学院,南京210009

出　　处：《南京航空航天大学学报》2006年第2期251-255,共5页Journal of Nanjing University of Aeronautics & Astronautics

基　　金：国家自然科学基金(50278031)资助项目;"973"国家重点基础研究基金(2001CB61070503)资助项目

摘　　要：膨胀剂在我国被广泛地应用于补偿大体积混凝土收缩。不同品种的膨胀剂对混凝土的补偿收缩效果有所不同。氧化钙类和硫铝酸钙类(AF t)可补偿混凝土的早期收缩,但分别在28和60 d后仍会出现后期收缩现象。水泥品种、养护条件对膨胀剂的膨胀效果有不同的影响。掺氧化镁类膨胀剂的混凝土没有出现后期收缩现象,比较适合水工大体积混凝土。在做好基础混凝土温度控制的同时,选择适宜品种的膨胀剂,可有效地控制混凝土的变形,减少收缩开裂,提高混凝土的结构耐久性能和建筑物的质量。Various expansive agents are developed recently in China to compensate the concrete shrinkage in different mechanisms. The early concrete shrinkage with CaO-type and AFt-type expansive agents may be compensated, but the later shrinkage after 28 and 60 d cannot be compensated. The expansive effects of these agents are different under different cement curing conditions. The later shrinkage does not exist in the hydraulic concrete with the MgO-type expansive agent. With a good control of temperature differences in the concrete near the foundation, expansive agents can reduce shrinkage and cracking in massive concrete constructions, thus improving their durability and quality.

关 键 词：大体积混凝土 膨胀剂 变形 耐久性 

分 类 号：TU377[建筑科学—结构工程]