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 fast-hardening 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.

TU528

“十三五”国家重点研发计划（2018YFD1101004）