摘要
本文以硅钙渣、矿渣、脱硫石膏为主要原材料,通过调整新拌浆体温度、预养护温度和预养护时间等工艺参数,研究了硅钙渣复合蒸压加气混凝土制备工艺对干密度、抗压强度及微观结构的影响。结果表明,随着新拌浆体温度的升高,试样抗压强度呈先增大后减小的趋势,在45℃时达到峰值,较25℃时提升96.3%。随着预养护温度的升高,试样抗压强度呈先增大后减小的趋势,预养护温度为62.5℃时抗压强度较52.5℃时提高19.6%。预养护时间为8 h时托勃莫来石呈大叶片状有序排列,试样达到A05强度级别,预养护时间过短(<8 h)会导致主要水化产物托勃莫来石分布不均匀,预养护时间过长(>8 h)则会引发界面劣化。通过优化工艺参数(新拌浆体温度45℃、预养护温度62.5℃、预养护时间8 h)可协同提升硅钙渣复合蒸压加气混凝土力学性能与孔隙结构均匀性,为硅钙渣建材工业化应用提供理论支撑。
In this paper,silicon calcium slag,slag,and desulfurization gypsum were used as the main raw materials.By adjusting the process parameters such as fresh slurry temperature,pre-curing temperature and pre-curing time,the influence of the preparation process of silicon calcium slag composite autoclaved aerated concrete on dry density,compressive strength,and microstructure was studied.The results show that with the increase of fresh slurry temperature,the compressive strength of the test block shows a trend of increasing first and then decreasing,reaching a peak at 45℃,an increase of 96.3%compared to 25℃.With the increase of pre-curing temperature,the compressive strength of the test block shows a trend of increasing first and then decreasing.When the pre-curing temperature is 62.5℃,the compressive strength increases by 19.6%compared to the 52.5℃group.When the pre-curing time is 8 h,the tobermorite is arranged in a large leaf like orderly manner,and the test block reaches the A05 strength level.If the pre-curing time is too short(<8 h),it will cause uneven distribution of the main hydration product tobermorite.If the pre-curing time is too long(>8 h),it will cause interface degradation.By optimizing the process parameters(fresh slurry temperature of 45℃,precuring temperature of 62.5℃,pre-curing time of 8 h),the mechanical properties and pore uniformity of silicon calcium slag composite autoclaved aerated concrete can be synergistically improved,providing theoretical support for the industrial application of calcium silicate slag building materials.
作者
梁新星
张敬申
王朝胜
梁李归祖
刘泽
张通
朱颖灿
LIANG Xinxing;ZHANG Jingshen;WANG Chaosheng;LIANG Liguizu;LIU Ze;ZHANG Tong;ZHU Yingcan(School of Chemistry and Environmental Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;Huang Huai Laboratory,Henan Academy of Sciences,Zhengzhou,450046,China;Shanghai Geopoly New Materials Co.,Ltd.,Shanghai 200072,China)
出处
《硅酸盐通报》
北大核心
2026年第1期40-46,共7页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金区域创新联合基金(U20A20324)。
关键词
硅钙渣
蒸压加气混凝土
预养护
力学性能
微观结构
silicon calcium slag
autoclaved aerated concrete
pre-curing
mechanical property
microstructure
