摘要
围绕钢渣再利用、钢渣矿渣复合材料强度提升及微观作用机理这3个问题,从无侧限抗压强度和劈裂强度两个指标分析混合料不同养护龄期下的宏观强度,同时进行XRD、SEM和热重分析等微观试验,探讨了在石灰激发作用下,钢渣矿渣基层材料的水化产物生成和强度变化内在机制。强度试验结果表明:当矿渣掺量在10%(质量分数)以内,石灰与矿渣的质量比在1∶1~1∶2时,混合材料各龄期的无侧限抗压强度和劈裂强度较高。微观试验结果表明:适量Ca(OH)2能够提高矿渣中SiO 2的水化反应速率,从而提升复合材料早期强度。此外,水化反应生成钙矾石、粉煤灰及钢渣中惰性组分的细料填充作用也是材料早强增长的有利因素。而粉煤灰的火山灰效应和钢渣中C 2S的持续水化反应则有助于复合材料后期强度的提升。
Focusing on the three issues of steel slag recycling,the strength enhancement of steel slag-blast furnace slag composite material as well as the microscopic action mechanism,the macroscopic strength of the mixture under different curing ages was analyzed from the two indicators of unconfined compressive strength and splitting strength.Besides,the internal mechanism of hydration products and strength formation of steel slag-blast furnace slag road base material under the lime activated were researched by XRD,SEM and thermogravimetric analysis.The strength test results show that when the mineral slag content is within 10%(mass fraction)and the mass ratio of lime and slag is between 1∶1 and 1∶2,the unconfined compressive strength and splitting strength of the mixed materials are higher than other lime and slag ratio at all ages.The microscopic test results reveal that an appropriate amount of Ca(OH)2 can promote the hydration reaction rate of SiO 2 in the mineral slag,and improve the early strength of the composite material.In addition,the filling effect of the ettringite generated by the hydration reaction,fly ash and the inert components in the steel slag is also a favorable factor for the early strength growth of the material.The pozzolanic effect of fly ash and the continuous hydration reaction of C 2S in steel slag are contributed to the improvement of the later strength of the composite material.
作者
吴旻
谢胜华
葛根旺
WU Min;XIE Shenghua;GE Genwang(School of Civil Engineering and Architecture,Anhui University of Technology,Maanshan 243002,China;School of Civil Engineering and Architecture,Maanshan University,Maanshan 243100,China)
出处
《硅酸盐通报》
CAS
北大核心
2021年第8期2640-2646,共7页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金面上项目(51978002)
金属矿山安全与健康国家重点实验室开放研究基金(2018JSKSSYS02)
安徽省高校自然科学研究重大项目(KJ2016SD08)。
关键词
道路工程
基层材料
钢渣
矿渣
水化反应
强度特性
road engineering
road base material
steel slag
blast furnace slag
hydration
strength chatacteristic
