基于粉煤灰的自密实地质聚合物混凝土的新鲜度、力学性能及耐久性：矿渣含量和不同养护条件的影响

Fresh, Mechanical, and Durability Behavior of Fly Ash-Based Self Compacted Geopolymer Concrete: Effect of Slag Content and Various Curing Conditions.

作者信息

Sherwani Aryan Far H, Younis Khaleel H, Arndt Ralf W

机构信息

Department of Civil Engineering, Faculty of Engineering, Soran University, Soran 44008, Kurdistan Region, Iraq.

Department of Civil Engineering, Fachhochschule Erfurt, University of Applied Sciences Erfurt, 99084 Erfurt, Germany.

出版信息

Polymers (Basel). 2022 Aug 6;14(15):3209. doi: 10.3390/polym14153209.

DOI:10.3390/polym14153209

PMID:35956725

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9370972/

Abstract

This investigation evaluates the influence of various curing conditions and slag inclusion on the fresh, mechanical, and durability properties of self-compacting geopolymer concrete (SCGC) based on fly ash (FA). Curing temperature and curing time have a vital role in the strength and microstructure of geopolymer concrete. Therefore, to begin the research, the impacts of different curing conditions (curing temperature and curing time) and slag content on the compressive strength of FA-based SCGC were examined to determine the optimum curing method. A series of four SCGC mixes with a fixed binder content (450 kg/m) and an alkaline/binder ratio of 0.5 was designated to conduct a parametric study. FA was replaced with slag at four different substitution percentages, including 0%, 30%, 50%, and 100% of the total weight of the binder. The fresh properties of the produced SCGC specimens were investigated in terms of slump flow diameter, T50 flow time, and L-box height ratio. Additionally, the following mechanical properties of SCGC specimens were investigated: modulus of elasticity and fracture parameters. The water permeability and freezing-thawing resistance were studied to determine the durability behavior of SCGC. In this study, the optimum curing temperature was 85 °C for the duration of 24 h, which provided the maximum compressive strength. The results confirmed that adding slag affected the workability of SCGC mixtures. However, the mechanical characteristics, fracture parameters, and durability performance of SCGC were improved for slag-rich mixtures. When using 50% slag instead of FA, the percentage increase in compressive, flexural, elastic module, and fracture energy test values were about 100%, 43%, 58%, and 55%, respectively, whilst the percentage decrease in water permeability was 65% and the resistance to freeze-thaw test in terms of surface scaling was enhanced by 79%.

摘要

本研究评估了各种养护条件和矿渣掺入量对基于粉煤灰（FA）的自密实地质聚合物混凝土（SCGC）的新拌性能、力学性能和耐久性的影响。养护温度和养护时间对地质聚合物混凝土的强度和微观结构起着至关重要的作用。因此，为开展本研究，考察了不同养护条件（养护温度和养护时间）及矿渣含量对基于FA的SCGC抗压强度的影响，以确定最佳养护方法。设计了一系列四种SCGC混合料，其固定胶凝材料含量为450 kg/m³，碱/胶凝材料比为0.5，以进行参数研究。用矿渣以四种不同替代百分比取代FA，替代百分比包括胶凝材料总重量的0%、30%、50%和100%。根据坍落流动直径、T50流动时间和L型箱高度比研究了所制备的SCGC试件的新拌性能。此外，还研究了SCGC试件的以下力学性能：弹性模量和断裂参数。研究了水渗透性和抗冻融性，以确定SCGC的耐久性表现。在本研究中，最佳养护温度为85℃，养护持续时间为24 h，此条件下提供了最大抗压强度。结果证实，添加矿渣影响了SCGC混合料的工作性。然而，富含矿渣的混合料改善了SCGC的力学特性、断裂参数和耐久性性能。当使用50%矿渣替代FA时，抗压、抗弯、弹性模量和断裂能测试值的百分比增加分别约为100%、43%、58%和55%，而水渗透性的百分比降低为65%，表面剥落方面的抗冻融试验性能提高了79%。