CO_2浓度对氢氧化钙碳化性能的影响  

Influence of CO_2 Concentrations on Carbonation Property of Ca(OH)_2

作　　者：乔欣元 

机构地区：[1]大连港湾工程有限公司,辽宁大连116020

出　　处：《广州化工》2015年第15期3-4,25,共3页GuangZhou Chemical Industry

基　　金：国家自然科学基金:基于多层次结构特征的新型混杂纤维增强水泥基复合材料(HyFRCC)的性能及机理研究(项目编号:51478082)

摘　　要：碳化时间及CO2浓度,显著影响氢氧化钙的碳化特性。本试验中,保持CO2压力为0.2 MPa、用水量为10%,控制CO2浓度变化范围为10%~99%,碳化时间为5 min^24 h。试验结果显示,在同一CO2浓度下,随碳化时间延长,氢氧化钙碳化速率逐渐提高,试块强度也不断增加;而随着气体浓度的不断增加,氢氧化钙的碳化速度也不断增加。研究发现,在试块达到相同碳化程度时,试块在低浓度CO2气体下的碳化强度要高于高浓度气体条件下的碳化强度。对碳化样品的XRD分析表明,碳化产物中仅含有方解石型碳酸钙。The influence of different CO 2 concentrations on carbonation properties of Ca（ OH） 2 was investigated.In this research, CO2 concentration and carbonation time were ranged from 10% to 99% and 5 min to 24 h, respectively. 0.2 MPa gas pressure and 10% water content were applied.The results showed that with the increasing of carbonation time, the carbonation degree and compressive strength of Ca（ OH）2 compacts were improved, and with the increasing of CO2 concentration, the rate of carbonation also increased.In addition, the lower CO2 concentration condition, the higher compressive strength, which carbonated compacts had a same carbonation degree. XRD patterns showed that the carbonated product only had calcite.

关 键 词：氢氧化钙 碳化 二氧化碳 抗压强度 

分 类 号：TU528.01[建筑科学—建筑技术科学]