施工技术

2022, v.51;No.609(14) 97-104

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基于单纯形重心设计法的地聚物混凝土配合比设计研究
Mix Proportion of Geopolymer Concrete Based on Simplex-centroid Design Method

王德法;丁磊;许丽影;朱梦雲;
WANG Defa;DING Lei;XU Liying;ZHU Mengyun;School of Civil Engineering and Architecture, Xi'an University Technology;School of Civil Engineering, Jilin Jianzhu University;

摘要(Abstract):

以偏高岭土、粉煤灰、矿渣微粉作为原材料制备一种高强地聚物混凝土,采用单纯形重心设计法对原材料进行定量及优化设计,设计3组碱激发剂模数分别为1.3M,1.5M,1.8M的材料配合比,分析不同模数、不同原材料用量对混凝土力学性能及内部结构的影响。结果表明:随着碱激发剂模数的增加,坍落度呈先下降后上升趋势;原材料含量对混凝土坍落度同样影响较大;混凝土稠度值均>31s,表明此类地聚物混凝土具有超干硬性指标。随着模数增加,混凝土抗压强度显著降低;矿渣微粉对混凝土强度增长的影响较显著,粉煤灰和偏高岭土则相反。SEM测试结果表明,低模数激发下的地聚物混凝土越致密,裂缝越少;原材料含量对混凝土内部结构致密性影响较大,从而影响混凝土宏观性能。
The metakaolin, fly ash and slag powder were used as raw materials to prepare a high strength geopolymer concrete. The simplex-centroid design method was used to quantitatively and optimally design the raw materials. The material ratios of three groups of alkali activator modulus of 1.3 M, 1.5 M,1.8 M were designed, and the effects of different modulus and raw material dosage on the mechanical properties and internal structure of concrete were analyzed. The results show that with the increasing of modulus of alkali activator, the slump first decreases and then increases. Raw material content also has great influence on concrete slump. Concrete vebe consistency values > 31 s, indicating that such geopolymer concrete has super-dry hardness index.With the increasing of modulus, the compressive strength of concrete decreases significantly. Slag powder has a significant effect on the strength growth of concrete, while fly ash and metakaolin are opposite. SEM results show that the denser geopolymer concrete under low modulus excitation, the less cracks. The content of raw materials has a great influence on the internal structure compactness of concrete, thus affecting the macroscopic properties of concrete.

关键词(KeyWords): 地聚物混凝土;单纯形重心设计法;坍落度;稠度;抗压强度;微观形态
geopolymer concrete;simplex-centroid design method;slump;consistency;compressive strength;micromorphology

Abstract:

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基金项目(Foundation): 榆林市2020年科技计划项目(CXY-2020-081,CXY-2020-080)

作者(Authors): 王德法;丁磊;许丽影;朱梦雲;
WANG Defa;DING Lei;XU Liying;ZHU Mengyun;School of Civil Engineering and Architecture, Xi'an University Technology;School of Civil Engineering, Jilin Jianzhu University;

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