Siddique Salman, Gupta Vivek, Chaudhary Sandeep, Park Solmoi, Jang Jeong-Gook
Division of Architecture and Urban Design, Urban Science Institute, Incheon National University, 119 Academy-ro, Yeonsu-gu, Incheon 22012, Korea.
Department of Civil Engineering, Indian Institute of Technology Indore, Simrol, Indore 453552, India.
Materials (Basel). 2021 Jun 27;14(13):3590. doi: 10.3390/ma14133590.
This study presents an investigation of the effects of the precursor, alkalinity and temperature on the rheology and structural buildup of alkali activated materials. Here, 100% fly ash, 100% slag and blended mixes of fly ash and slag were activated by 4 M, 6 M, 8 M or 10 M (only for sodium hydroxide) solutions at 25 °C, 35 °C, 45 °C and 55 °C. The rheological properties were investigated to obtain the flow curves, viscosity, storage modulus, and loss factor of these materials. The results showed that for the presence of slag, a higher molarity of the alkali activating solution and a high temperature all caused greater interparticle force, leading to an increase in the shear stress and viscosity of the alkali activated materials. It was also observed that slag had the greatest effect on the increase in the storage modulus of the blended mixes. Furthermore, the higher alkalinity and temperature levels were instrumental in initiating the dissolution of fly ash and improving its rate of structural buildup. Moreover, the interdependence of various factors showed that the type of precursor, as well as the concentration of alkali activating solution, were the primary influencing factors on the polymerization process, as well as the rheological measurements of alkali-activated materials.
本研究对前驱体、碱度和温度对碱激发材料的流变学和结构形成的影响进行了调查。在此，100%粉煤灰、100%矿渣以及粉煤灰与矿渣的混合混合料分别在25℃、35℃、45℃和55℃下用4M、6M、8M或10M（仅针对氢氧化钠）溶液进行激发。对这些材料的流变特性进行了研究，以获得其流动曲线、粘度、储能模量和损耗因子。结果表明，由于矿渣的存在，较高摩尔浓度的碱激发溶液和较高温度均会导致颗粒间作用力增大，从而使碱激发材料的剪切应力和粘度增加。还观察到，矿渣对混合混合料储能模量的增加影响最大。此外，较高的碱度和温度水平有助于引发粉煤灰的溶解并提高其结构形成速率。而且，各种因素的相互依存关系表明，前驱体类型以及碱激发溶液的浓度是对碱激发材料聚合过程以及流变学测量的主要影响因素。
