摘要
以钾水玻璃为激发剂、偏高岭土和粉煤灰为主要硅铝原料制备地聚物,测试了地聚物净浆、砂浆和混凝土的常温和高温后抗折及抗压强度,并与矿渣硅酸盐水泥净浆、砂浆和混凝土的试验结果进行了比较。通过地聚物热重分析以及高温后地聚物试样的收缩变形量测,对试验结果进行了分析及解释。结果表明,配制出的地聚物净浆、砂浆和混凝土的抗压及抗折强度均随温度升高而降低,但无论是常温还是高温后,其强度都基本能达到或超过水泥净浆、砂浆和混凝土的相应强度;高温下地聚物收缩而骨料膨胀,两者变形的不一致将导致地聚物混凝土高温开裂。
Geopolymer was prepared by using potassium silicate as activator solution, metaKaolin and fly ash blend as main silicoaluminate materials. The bending and compressive strength before and after exposure to high temperature was tested on geopolymer paste, mortar and concrete specimens, and the results were compared with that of cement paste, mortar and concrete speci- mens. The trends of test results and phenomena were explained by thermogravity analysis and thermal contraction measurement of geopolymer. The test results show that the bending and compressive strength of geopolymer paste, mortar and concrete decrease with increase of temper- atures, but either at ambient temperature or after exposure to high temperature the strength of geopolymer paste, mortar and concrete prepared in this study can almost reach or exceed that of cement paste, mortar and concrete. The incompatibility between thermal contraction of geopoly- mer and thermal expansion of aggregates induces cracking of geopolymer concrete at elevated temperatures.
出处
《防灾减灾工程学报》
CSCD
北大核心
2015年第1期11-16,共6页
Journal of Disaster Prevention and Mitigation Engineering
基金
国家自然科学基金项目(51108193)
华南理工大学亚热带建筑科学国家重点实验室自主课题(2011ZC30
2013ZC21)
广州白云区科技项目(2011-KZ-48)资助
关键词
地聚物
水泥
抗折强度
抗压强度
高温
力学性能
geopolymer
cement
bending strength
compressive strength
high temperature mechanial performance
