| 马昆林,贺炯煌,龙广成,党晗菲,谢友均.蒸养温度效应及其对水泥基材料热伤损的影响＊[J].材料导报,2017,31(23):171-176 |
| 蒸养温度效应及其对水泥基材料热伤损的影响＊ |
| Steam-curing Temperature Effect and Its Influence on Heat Damage of Cement-based Material |
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| DOI：10.11896/j.issn.1005-023X.2017.023.025 |
| 中文关键词: 蒸养混凝土 温度 微观结构 孔隙率 热伤损 |
| 英文关键词: steam-curing concrete, temperature, microstructure, porosity, heat damage |
| 基金项目:高铁联合基金(U1534207)；中南大学中央高校基本科研业务费专项资金(2017zzts751) |
| 作者 | 单位 | E-mail | | 马昆林 | 中南大学土木工程学院,高速铁路建造技术国家工程实验室,长沙 410075 | makunlin@csu.edu.cn | | 贺炯煌 | 中南大学土木工程学院,高速铁路建造技术国家工程实验室,长沙 410075 | | | 龙广成 | 中南大学土木工程学院,高速铁路建造技术国家工程实验室,长沙 410075 | | | 党晗菲 | 中南大学土木工程学院,高速铁路建造技术国家工程实验室,长沙 410075 | | | 谢友均 | 中南大学土木工程学院,高速铁路建造技术国家工程实验室,长沙 410075 | |
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| 中文摘要: |
| 采用温度传感器测试了水泥基材料在标养和蒸养条件下温度的变化,结合X射线衍射(XRD)、扫描电子显微镜(SEM)、热重分析(TGA)及压汞(MIP)等方法,研究了水化产物和微结构的变化。结果表明,蒸养中试件表层首先开始升温,升温结束时表层温度比内部高约30 ℃；随后内部升温超过表层,恒温3 h,内部温度比表层高约25 ℃。蒸养温度效应对水化产物的生成未产生较显著的影响,但对表层孔结构和微观形貌影响显著。蒸养结束时,试件表层的总孔隙率以及大于200 nm的有害孔比例分别是内部的1.22倍和10.3倍；继续标养至28 d时有效降低了总孔隙率,但大于200 nm的有害孔比例仍为标养试件的1.6倍。 |
| 英文摘要: |
| The temperature change of cement-based material in moist-curing and steam-curing were measured by temperature sensors. The evolutions of hydration products and microstructure were investigated by means of XRD, SEM, TGA and MIP. Results show that in the steam-curing process, temperature of specimen surface increases first. At the end of temperature increasing, surface temperature is about 30 ℃ higher than the internal temperature. Afterwards, the internal temperature increasing exceeds the surface. Internal temperature is about 25 ℃ higher than surface after constant temperature(60 ℃) curing for 3 hours. The change of temperature and time exerts limited effects on the formation of hydration products, but it brings about remarkable influence on pore structure and microtopography on surface layer. At the end of steam-curing, the total porosity and harmful pore ratio with diameter larger than 200 nm in surface layer are 1.22 and 10.3 times of that of internal structure. The total porosity is reduced effectively in moist-curing at 28 d. However, the pore ratio with diameter greater than 200 nm is still 1.6 times of moist-curing specimens. |
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