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预养护对二氧化碳养护混凝土过程及显微结构的影响
作者:史才军1 2 何平平1 涂贞军1 曹张1 
单位:1.湖南大学土木工程学院 长沙 410082  2.绿色建材国家重点实验室 中国建材科学研究总院 北京 100024 
关键词:二氧化碳养护 预养护 养护程度 微观结构 
分类号:TU502
出版年,卷(期):页码:2014,42(8):00-00
DOI:
摘要:

研究了干硬性混凝土经干燥环境预养护后的剩余水灰比对其二氧化碳养护过程及显微结构发展的影响。用热重分析和Fourier红外光谱测试等对二氧化碳养护砂浆过程中形成的产物进行了定性和定量分析,并利用压汞测孔仪分别测试了二氧化碳养护3 h和自然养护5 h的砂浆的孔径分布。结果表明:剩余水灰比为0.16~0.20时二养护碳养护程度及抗压强度最高;养护过程中反应物为水泥颗粒及少量水化产物,生成方解石及硅胶;养护程度较高的试件生成的碳酸钙结晶度较高;二氧化碳养护后混凝土孔隙率明显降低,50~1 000 nm的毛细孔含量降低,养护程度越高的混凝土,孔结构改善程度越高。

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This paper investigated the effect of remaining water-cement ratio on the curing process and microstructure of concrete subjected to CO2 curing. The microstructure of CO2 cured products was characterized by thermogravimetry,Fourier transform infrared spectroscopy and mercury porosimetry, respectively. The result indicates that CO2 curing of cement mortar occurs on fresh concrete based on the reactions between cement clinker and CO2. The optimal optimal CO2 curing degree and compressive strength can be obtained at the remaining water-cement ratio of 0.16-0.20. The specimen with a greater CO2 curing degree produces carbonates with a better crystallinity. After CO2 curing, the total porosity and portion of capillary pore (50-1 000 nm) of concrete decreases evidently.

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基金项目:
作者简介:
第一作者:史才军(1963—),男,教授。
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参考文献:

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