快硬早强无收缩混凝土在外墙板中的应用  

Application of fast-hardening and early-strength non-shrinkage concrete in exterior wall panel

作　　者：钮旋敏 NIU Xuanmin(Tianjin North China Geological Exploration Bureau,Tianjin 300170)

机构地区：[1]天津华北地质勘查局,天津300170

出　　处：《中国建材科技》2023年第2期25-28,共4页China Building Materials Science & Technology

基　　金：“十三五”国家重点研发计划(2018YFD1101004)。

摘　　要：利用超细钢渣微粉f-CaO、f-MgO的梯度水化特性,开发了一种外墙用快硬早强无收缩混凝土,解决了收缩开裂难题。快硬无收缩混凝土具有良好的流动性与填充性,不离析、不泌水,快硬早强,扩展度达到680mm以上,泌水率为0,12h抗压强度19.4MPa以上,不掺膨胀剂保证混凝土无收缩不开裂,24h竖向膨胀率0.42%以上。快硬早强无收缩混凝土制备的外墙板,180min耐火试验后,背火面平均温升34℃、最高温升39℃,未出现火焰。Based on the gradient hydration characteristics of ultrafine steel slag powder f-CaO and f-MgO,a kind of fasthardening and early-strength non-shrinkage concrete(FHESNFC)for exterior wall is prepared,which solves the problem of shrinkage cracking.This concrete has good fluidity and filling property,no segregation,no bleeding,fast-hardening and early-strength.The expansion degree is greater than 680mm,bleeding rate is 0,and 12-hour compressive strength is greater than 19.4MPa.This concrete has no shrinkage cracking without expansive agent,and 24-hour vertical expansion rate is 0.42%.An exterior wall panel is prepared by FHESNFC.After 180 minutes of fire resistance test,the average temperature rise of the back fire surface of exterior wall panel is 34℃,and the maximum temperature rise is 39℃,without any flame.

关 键 词：无收缩混凝土 快硬早强 超细钢渣粉 外墙板 膨胀剂 

分 类 号：TU528[建筑科学—建筑技术科学]