钢渣碳化砖的碱激发-碳化协同作用机制  

Synergistic mechanisms of alkali-activation and carbonation of carbonated steel slag bricks

作　　者：史迪 叶家元 张文生 司政凯 张梦安 张寒月 SHI Di;YE Jiayuan;ZHANG Wensheng;SI Zhengkai;ZHANG Meng'an;ZHANG Hanyue(State Key Laboratory of Green Building Materials,China Building Materials Academy,Beijing 100024,China;Henan Xing'an New Building Materials Co.,Ltd.,Zhengzhou 450100,Henan,China)

机构地区：[1]中国建筑材料科学研究总院有限公司绿色建筑材料国家重点实验室,北京100024 [2]河南兴安新型建筑材料有限公司,河南郑州450100

出　　处：《钢铁研究学报》2021年第11期1127-1133,共7页Journal of Iron and Steel Research

基　　金：国家863计划资助项目(2009AA03Z506);河南省智汇郑州·1125聚才计划资助项目。

摘　　要：以钢渣为原料,标准砂为骨料,碳酸钠为碱激发剂,基于碱激发-碳化协同作用制备钢渣碳化砖。采用X射线衍射、热重/差示扫描量热分析、压汞法以及扫描电子显微镜分别对试样的物相组成、孔隙率以及微观形貌进行表征。通过对比研究"碱激发"、"碳化"以及"碱激发+碳化"作用对试样强度、产物组成、孔隙率以及微观形貌的影响,对碱激发-碳化协同作用机制进行深入探讨。结果表明,碳酸钠可激发钢渣胶凝活性,生成薄片状水化硅酸钙(C-S-H)凝胶,为试样提供初始性能。碳化过程中生成的CaCO_(3)等反应产物对试样具有"填充效应",这是试样强度性能提高的主要原因。碱激发过程中生成的C-S-H凝胶为碳化反应提供碳化源,促进碳化反应的发生;碳化反应利用碱激发反应产物C-S-H凝胶为碳化源,生成CaCO_(3)等反应产物,使基体致密程度提高,从而使试样性能得到进一步优化。Based on the synergistic effect of alkali-activation and carbonation,carbonated steel slag bricks were prepared by steel slag,ISO sand and sodium carbonate.The mineralogy,porosity and morphology of steel slag bricks were analyzed by X-ray diffraction,thermogravimetry/differential scanning calorimetry analysis,mercury intrusion porosimeter and scanning electron microscopy,respectively.The effects of alkali-activation,carbonation and“alkali-activation+carbonation”on strength,reaction products,porosity and morphology were investigated.Then,the synergistic mechanisms of alkali-activation and carbonation were discussed.The results show that sodium carbonate can improve the cementitions activity of steel slag and produce flaky-like calcium silicate hydrate(C-S-H)gels to provide the initial properties of steel slag bricks.The CaCO_(3) and other reaction products generated during the carbonization process have a"filling effect"on the sample,which is the main reason for the improvement of the strength of the sample.The synergistic effect of alkali-activation and carbonation was observed.The C-S-H gels resulted from the alkali-activation of steel slag,which can be easily carbonated,is favorable to the carbonation process.The carbonation products of C-S-H gels filled into the pores,consequently resulting into the increase of compactness and strength of steel slag bricks.

关 键 词：钢渣砖 碳化 碱激发 协同作用 机制 

分 类 号：X757[环境科学与工程—环境工程]