摘要
采用高温纯CO2水溶液加速碳化的方法，通过对不同龄期碳化试样的抗压强度和孔结构测试、渗透率测定及微观形貌分析，并结合净浆水泥石的碳化性能进行同步比较，对偏高岭土-矿渣基地聚合物的碳化性能进行了研究。结果表明：偏高岭土．矿渣基地聚合物的抗碳化能力明显优于净浆水泥石。地聚合物碳化28d和90d时，试样的抗压强度分别比同龄期水养试样降低了4．44％和11．08％（水泥石分别降低了8．61％和33．55％）；试样总孔隙率仅为11．47％和14．85％（水泥石总孔隙率分别为27．45％和31．63％），且孔径分布均主要集中于0-50nm区间；地聚合物试样在7．0MPa的驱替压力下不渗滤，而水泥石的渗透率分别为1．27×10^-3μm^2。和1．82×10^-3μm^2。15MPa压力下地聚合物的渗透率为2．80×10^-3μm^2和5．90×10^-3μm^2，仅为水泥石渗透率的1／10左右；地聚合物碳化90d时，试样结构连续致密，而水泥石结构疏松，胶凝相基本消失。
To analysis the anti-carbonation property of metakaolin-slag geopolymer, the method of accelerated carbonation with CO2 water solution at hydrothermal condition was adopted. The compressive strength, pore structure, permeability and micro-morphology of specimens at different ages were analyzed and compared with hardened cement pastes. The results showed that the anti-carbonation property of geopolymer was better than that of Cement paste. After 28 d and 90 d carbonation, the compressive strength of geopolymer declined by 4.44% and 11.08% respectively when compared to those specimens after water curing for 28 d and 90 d （the compressive strength of cement paste was respectively reduced by 8.61% and 33.55%）. The porosity was 11.47% and 14.85% （on the contrary, the porosity of cement paste was 27.45% and 31.63%） and the pore size mainly distributed between 0 nm and 50 nm. Geopolymer samples did not permeate at the driving pressure of 7.0 MPa while cement paste had permeability of 1.27×10^-3μm^2 and 1.82×10.3^-3μm^2. When the driving pressure was improved tel 5.0 MPa, the permeability of geopolymer was respectively 2.80×10^-3μm^2 and 5.90×10^-3μm^2, only about 1/10 of that of cement paste. The microstructure showed that the 90 d carbonation product of geopolymer was compacter than the carbonated cement.
出处
《非金属矿》
CAS
CSCD
北大核心
2011年第3期48-50,共3页
Non-Metallic Mines
基金
国家高技术研究发展计划(2006AA06Z225)
关键词
地聚合物
水泥石
碳化性能
孔结构
渗透率
geopolymer hardened cement paste carbonation property pore structure permeability
