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Metakaolin based geopolymers with high limestone contents – statistical modeling of strength and environmental and cost analyses
Cement & Concrete Composites ( IF 10.5 ) Pub Date : 2019-11-07 , DOI: 10.1016/j.cemconcomp.2019.103450
Pedro Perez-Cortes , J. Ivan Escalante-Garcia

The mechanical properties of alkaline binders of precursors of metakaolin with up to 80% limestone and molar ratios of Na/Al=0.5-1.86 and Si/Al=1.81-3.13 were modelled and optimized using the surface response method. A quadratic model (R-squared=94.31%) indicated an optimal formulation of 32.32%LS, Na/Al=1.34 and Si/Al=2.96 with a predicted 28-day strength of 70±3.9MPa, experimentally corroborated at 69MPa; that was higher than references of 100%MK and blended Portland cement (BPC). Other optimized blends of 0 and 60%LS reached 51 and 62MPa, respectively, were successfully corroborated experimentally. The microstructural features were in agreement with the high strength. The analyses of cost, CO2-emissions and energy demand indicated that pastes of 100% metakaolin are better than BPC only regarding CO2 emissions, while blends with %LS>32.12% were better in all indicators relative to both of the former. As limestone is abundant, cheap, reduces the demand of alkalis and do not require calcination, these binders are actually sustainable.



中文翻译:

石灰石含量高的偏高岭土基聚合物–强度,环境和成本分析的统计模型

使用表面响应方法对偏高岭土前驱体的碱性粘合剂的机械性能进行了建模和优化,其中偏高岭土的前驱体具有高达80%的石灰石和Na / Al = 0.5-1.86和Si / Al = 1.81-3.13的摩尔比。二次模型(R-平方= 94.31%)表明最佳配方为32.32%LS,Na / Al = 1.34和Si / Al = 2.96,预计28天强度为70±3.9MPa,实验上证实为69MPa。高于100%MK和混合波特兰水泥(BPC)的参考值。通过实验成功地证实了0和60%LS的其他优化共混物分别达到51和62MPa。显微组织特征与高强度相符。成本,CO 2排放和能源需求的分析表明,仅就CO而言,100%偏高岭土的浆料优于BPC2种排放,而%LS> 32.12%的混合气在所有指标中均优于前两者。由于石灰石丰富,便宜,减少了对碱的需求并且不需要煅烧,因此这些粘合剂实际上是可持续的。

更新日期:2019-12-11
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