湿度对氯氧镁水泥二氧化碳吸附能力影响研究  

Effect of Humidity on Carbon Dioxide Sorption Capacity of Magnesium Oxychloride Cement

作　　者：冯超[1] 关博文[1] 张奔[1] 陈华鑫[1] 房建宏 FENG Chao;GUAN Bo-wen;ZHANG Ben;CHEN Hua-xin;FANG Jian-hong(School of Materials Science and Engineering,Chang an University,Xian 710064,China;Qinghai Research Institute of Transportation,Xining 810000,China)

机构地区：[1]长安大学材料科学与工程学院,西安710064 [2]青海省交通科学研究院,西宁810000

出　　处：《硅酸盐通报》2018年第8期2355-2360,共6页Bulletin of the Chinese Ceramic Society

基　　金：国家重点研发计划(2017YFB0309903);青海省自然科学基金(2017-ZJ-764);中央高校基本科研业务费专项资金(310831172201;300102318401;300102318501)

摘　　要：氯氧镁水泥(MOC)是一种可以大量吸附二氧化碳的生态水泥,以单位面积质量变化作为碳化能力指标,研究了不同湿度条件下MOC的碳化过程。试验结果表明,低湿度下碳化缓慢,随着湿度的升高MOC碳化过程明显加速。XRD结果表明在不同湿度下MOC碳化反应和碳化产物不尽相同:低湿度下的反应物主要是Mg(OH)_2,碳化产物为MgCO_3;而高湿度下的反应物主要是Mg(OH)_2,和MgO,碳化产物为MgCO_3·3H_2O和少量Mg+2CO+3ClOH·2H_2O。碳化后MOC耐水性明显改善,SEM图像证实碳化后MOC表面被碳酸镁或碳酸镁三水合物覆盖,阻隔了外部水分和MOC接触。灰度分析表明碳化行为降低了水分对骨料-砂浆界面的破坏,进而提高MOC的耐水性。Magnesium oxychloride cement(MOC)is an ecological cement that can absorb large amounts of carbon dioxide.The carbonation process of MOC under different humidity conditions was studied,and the mass change per unit area was used as an index of carbonation capacity.The test results showed that the carbonation was slow at low humidity,and the MOC carbonation process was significantly accelerated with increasing humidity.The XRD results showed that the MOC carbonation reaction and carbonation resultant were diverse under different humidity conditions.The main resultant was MgC03 at low humidity,while the Mg(0H)2 was the main reactant.However the main products were MgC03.3H20 and a small quantity of Mg2C03 C10H.2H20 while Mg(OH)2 and MgO as the reactant.The water resistance of the MOC after carbonation was significantly improved.SEM images confirmed that the surface of the MOC after carbonation was covered with MgC03or MgC03.3H20,which protected the MOC from contact by external moisture.And the gray scale analysis showed that the external moisture was prevented from damaging effect at aggregate-mortar interface by carbonation.

关 键 词：氯氧镁水泥 碳化 湿度 耐水性能 

分 类 号：U414[交通运输工程—道路与铁道工程]