Frost Resistance of Alkali-Activated Combined Slag and Fly Ash Concrete Cured at Ambient Temperature

被引：2
作者：
Rodrigue, Alexandre [1 ]
Duchesne, Josee [1 ,2 ]
Fournier, Benoit [1 ,2 ]
Bissonnette, Benoit [3 ]
机构：
[1] Univ Laval, Geol Engn, Quebec City, PQ, Canada
[2] Univ Laval, Dept Geol & Geol Engn, Quebec City, PQ, Canada
[3] Univ Laval, Dept Civil Engn, Quebec City, PQ, Canada
来源：
ACI MATERIALS JOURNAL | 2022年 / 119卷 / 03期
基金：
加拿大自然科学与工程研究理事会;
关键词：
alkali-activated concrete; deicing salts; durability; fly ash; freezing; scaling; slag; thawing; FREEZE-THAW RESISTANCE; BLAST-FURNACE SLAG; CARBONATION; STRENGTH;
D O I：
10.14359/51734600
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Alkali-activated slag/fly ash concretes were tested regarding their resistance to freezing-and-thawing cycles and deicing salt scaling. Different fly ash contents, added water dosages, and air-entraining admixture (AEA) dosages were tested. The deicing salt-scaling resistance tests were conducted on different types of surfaces (troweled, formed, saw cut). The tested alkali-activated slag/fly ash concretes showed excellent performances to freezing and thawing (300 cycles) with statistically identical values of relative dynamic modulus of elasticity averaging 100%. The performance was also good for specimens tested without addition of AEA. However, they exhibited poor scaling resistance to deicing salts with only one mixture satisfying the 0.50 kg/m(2) (0.102 lb/ft(2)) limit of the Bureau de normalisation du Quebec (BNQ) test procedure, with a value of 0.49 kg/m(2) (0.100 lb/ft(2)). Finished surfaces underwent more scaling than formed or saw-cut surfaces. The curing of the specimens and the scaling test itself may not be suitable to test alkali-activated concrete.
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页码：3 / 13
页数：11
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