Chiranjeevi Koti, Abraham Marykutty, Rath Badrinarayan, Praveenkumar T R
Department of Civil Engineering, Sathyabama Institute of Science and Technology, Chennai, India.
Center for Remote sensing & Geoinformatics, Sathyabama Institute of Science and Technology, Chennai, India.
Sci Rep. 2023 Oct 12;13(1):17302. doi: 10.1038/s41598-023-44491-y.
Nowadays low calcium fly ash-based geopolymer concrete can be replaced with cement-based concrete to avoid the adverse effect of manufacturing cement on the environment. Utilization of geopolymer concrete instead of traditional concrete using low calcium fly ash and nano silica reduces a significant amount of CO- emission towards the atmosphere. However, the performance of geopolymer concrete is less than that of Portland cement concrete. To improve the performance of geopolymer concrete nano silica was used in the present study. In this work, geopolymer concrete was made utilizing fly ash, ground granular blast furnace slag (GGBS), and sugarcane bagasse ash. In the first instance, binary combinations i.e. fly ash and GGBS were employed as cementitious materials for the production of geopolymer concrete. In the second instance, a ternary mixture of pozzolanic material was prepared by taking 25% GGBS, 65% Fly ash, and 10% bagasse ash. In the third instance, varying percentages of nanoparticles were used for the above ternary mixture. The mechanical and durability properties of the geopolymer composite that was made earlier were tested. The compressive strength and split tensile strength of geopolymer composites were assessed for mechanical properties and a rapid chloride permeability test, water absorption test, and acid attack test were done to know about the porosity of concrete. Results showed that, with a dose of 4% nanoparticles, the durability and strength properties of the concrete had improved the most. The GCBA-N4 mixture had the highest split tensile and compressive strength was measured to be 2.91 MPa and 41.33 MPa and the rapid chloride permeability test, water absorption rate, and percentage of mass loss due to sulfate attack were found as a minimum for GCBA-N4 specimen.
如今，低钙粉煤灰基地质聚合物混凝土可以替代水泥基混凝土，以避免制造水泥对环境产生的不利影响。使用低钙粉煤灰和纳米二氧化硅的地质聚合物混凝土替代传统混凝土，可大幅减少向大气中的二氧化碳排放量。然而，地质聚合物混凝土的性能低于波特兰水泥混凝土。为提高地质聚合物混凝土的性能，本研究使用了纳米二氧化硅。在这项工作中，利用粉煤灰、磨细粒化高炉矿渣（GGBS）和甘蔗渣灰制作地质聚合物混凝土。首先，采用粉煤灰和GGBS这两种二元组合作为胶凝材料来生产地质聚合物混凝土。其次，通过使用25%的GGBS、65%的粉煤灰和10%的甘蔗渣灰制备火山灰质材料的三元混合物。第三，对上述三元混合物使用不同百分比的纳米颗粒。对之前制作的地质聚合物复合材料的力学性能和耐久性进行了测试。对地质聚合物复合材料的抗压强度和劈裂抗拉强度进行了力学性能评估，并进行了快速氯离子渗透性试验、吸水率试验和酸侵蚀试验，以了解混凝土的孔隙率。结果表明,纳米颗粒用量为4%时，混凝土的耐久性和强度性能改善最为显著。GCBA-N4混合物的劈裂抗拉强度和抗压强度最高，分别测得为2.9lMPa和41.33MPa，并且GCBA-N4试件的快速氯离子渗透性试验结果、吸水率和硫酸盐侵蚀导致的质量损失百分比最低。
