不同养护制度下低热水泥超高性能混凝土力学性能研究  

Study on mechanical properties of ultra-high-performance concrete with low heatcement under different curing systems

作　　者：王敏 李依芮 张坤悦 高显束 黄文 沈鑫 WANG Min(China Building Materials Academy Co.Ltd.,Beijing 100024,China)

机构地区：[1]中国建筑材料科学研究总院有限公司,北京100024 [2]中建材中研益科技有限公司,北京100024

出　　处：《水泥》2023年第7期1-4,17,共5页Cement

基　　金：中国建材集团关键核心技术攻关“揭榜挂帅”项目(2021HX0708)。

摘　　要：基于超高性能混凝土(UHPC)绿色化发展趋势及低热水泥(贝利特相为主)早期强度低的背景,对比研究了标准养护、蒸汽养护、蒸压养护条件下制备的低热水泥UHPC与硅酸盐水泥UHPC的强度及水化微结构。结果表明:低热水泥UHPC的拆模强度(标准养护)即1 d强度低于硅酸盐水泥UHPC,但在28 d和90 d时高于硅酸盐水泥UHPC。低热水泥UHPC热养护后即时力学强度发展明显提高,超过硅酸盐水泥UHPC。低热水泥UHPC浆体的C-S-H含量更高,CH含量更低,基体密实度更高,热养护后尤为明显。在蒸压养护90 d时,低热水泥UHPC的最高抗压强度为197.5MPa。Based on the backgrounds of green development trend of ultra-high-performance concrete(UHPC)and low early strength of low-heat cement(mainly belite phase),the strength and hydration microstructure of low heat cement UHPC and Portland cement UHPC prepared under standard curing,steam curing and autoclave curing conditions were studied.The results showed that the compressive strength and flexural strength of UHPC were lower than ordinary Portland cement after 1 day of standard curing,but which was higher than ordinary Portland cement at 28 days age and 90 days age.After thermal curing,the mechanical strength of low heat cement UHPC is significantly improved,exceeding the ordinary Portland cement UHPC.UHPC paste of low-heat cement has higher C-S-H content,lower CH content and higher density of matrix,which is especially obvious after thermal curing.When autoclaved curing for 90 days,the maximum compressive strength of low heat cement UHPC is 197.5 MPa.

关 键 词：超高强混凝土 低热硅酸盐水泥 蒸汽养护 蒸压养护 力学性能 

分 类 号：TU528[建筑科学—建筑技术科学] TQ172.7[化学工程—水泥工业]