摘要
通过温度-应力试验研究了钙质和镁质膨胀剂(Type-CaO, Type-MgO)对混凝土早期抗开裂性能的影响。结果表明,掺10%Type-MgO和Type-CaO膨胀剂混凝土的绝热温升较基准混凝土分别提高了3.6%和14.0%,断裂温度相对基准混凝土分别降低了9.7℃和1.7℃;约束条件下,掺10%Type-MgO膨胀剂混凝土的极限拉伸值和断裂应力相对基准混凝土均提高约27%,而掺10%Type-CaO膨胀剂混凝土的极限拉伸值和断裂应力与基准混凝土无明显区别;数据表明,镁质膨胀剂相比钙质膨胀剂可以明显提高混凝土的早期抗开裂性能,钙质膨胀剂不宜用于大体积混凝土的裂缝控制。
The early-age cracking resistance of concrete with CaO and MgO expansive agent were investigated based on the temperature-stress testing. The results show that compared with reference concrete, the adiabatic temperature rise of concrete with 10% MgO and CaO expansive agent tested in adiabatic model increases by 3.6% and 14.0%, and the cracking temperature decreases by 9.7 ℃ and 1.7 ℃. In restrained condition, the ultimate extension value and cracking stress of concrete with 10% MgO expansive agent increase by 27%, while concrete with 10% CaO expansive agent has no significant difference with reference concrete. MgO expansive agent could evidently improve the early-age Cracking resistance of concrete, and CaO expansive agent can not be applied to crack control of mass concrete.
作者
纪宪坤
刘猛
向飞
饶蔚兰
王海龙
刘勇
JI Xian-kun;LIU Meng;XIANG Fei;RAO Wei-lan;WANG Hai-long;LIU Yong(Wuhan Sanyuan Special Building Materials Co.,Ltd.,430080)
出处
《混凝土与水泥制品》
北大核心
2020年第2期14-18,共5页
China Concrete and Cement Products
基金
湖北省知识产权局2018年度高价值专利培育、转化和产业化项目“建筑结构自防水关键材料的产业化应用与拓展研究”
关键词
温度应力试验
钙质膨胀剂
镁质膨胀剂
抗裂性能
绝热温升
Temperature-stress testing machine
CaO expansive agent
MgO expansive agent
Early-age cracking resistance
Adiabatic temperature rise
