磷铝酸盐水泥浆体抗碳化性能的研究  

Behaviors of Carbonation Resistance of Phosphoaluminate Cement Pastes

作　　者：王卫仑[1] 李仕群[2] 邢锋[1] 丁铸[1] 胡佳山[1,2] 

机构地区：[1]深圳大学深圳市土木工程耐久性重点实验室,广东深圳518060 [2]济南大学材料科学与工程学院,山东济南250022

出　　处：《建筑材料学报》2012年第3期334-339,360,共7页Journal of Building Materials

基　　金：国家自然科学基金资助项目(50572035);国家杰出青年科学基金资助项目(50925829)

摘　　要：应用定量X射线衍射(QXRD)和电子探针微区分析技术,从微观角度考察了磷铝酸盐水泥(phosphoaluminate cement,PALC)浆体的碳化程度.通过对浆体的Ca2+溶出浓度、离子电导、在设定条件下浸出溶液的pH值和孔结构分析,探索了浆体的抗碳化机理.将上述研究与相应的硅酸盐水泥(PC)和硫铝酸盐水泥(SALC)浆体试样进行了比较,结果表明:在CO2(质量分数)>90%、相对湿度为(50±2)%的情况下,经碳化后的PALC浆体强度相对稳定:碳化45d时其抗压强度损失率为4.5%,而SALC和PC浆体抗压强度损失率分别达到了13.4%和29.1%.PALC浆体的碳化系数α为0.030,PC和SALC浆体的α分别为0.092和0.118,后两者分别是前者的3.08及3.94倍.Carbonation degree was analyzed by means of quantitative X-ray diffraction（QXRD） and the elec-tronic probe. The mechanisms of carbonation resistance of phosphoaluminate cement（PALC） pastes were discussed by analyzing the concentration of dissolved Ca^2＋ , ion conductivity, pH of the extracted solution and pore structure of the pastes. The comparisons of the above investigations were conducted with the cor-responding pastes of Portland cement（PC） and sulfate aluminate cement（SALC）. The results reveal that the loss of the compressive strength of PALC pastes is only 4.5% at the condition of exposure in CO2 of concentration 〉90%（by mass） and （50±2）% relative humidity for 45 d compared with exposure for 0 d; while the loss for the corresponding PC and SALC pastes is 13.4% and 29.1% respectively. The carbona-tion factor α of PALC paste is 0.030, which is 3.08 and 3.94 times lower than that of the corresponding PC （α=0. 092） and SALC（α=0. 118） pastes.

关 键 词：抗碳化特性 磷铝酸盐水泥浆体 抗碳化机理 

分 类 号：TU528.0[建筑科学—建筑技术科学]