Okoro Wilson, Oyebisi Solomon
Department of Civil Engineering, Covenant University, P.M.B. 1023, Ota, Nigeria.
Heliyon. 2023 Jan 26;9(2):e13188. doi: 10.1016/j.heliyon.2023.e13188. eCollection 2023 Feb.
Globally, an increasing carbon footprint has had a negative effect on the ecosystem and all living things. One of the sources that produces these footprints is the cement manufacturing process. Therefore, it is crucial to produce a cement substitute to reduce these footprints. The production of a geopolymer binder (GPB) is one of these possibilities. In this study, sodium silicate (NaSiO) was used as an activator in the production of geopolymer concrete (GPC) together with steel slag and oyster seashell as precursors. The materials of the concrete were prepared, cured, and tested. Workability, mechanical, durability and characterization test were conducted on the GPC. The results showed that adding a seashell increased the slump value. The optimum GPC compressive strength on a 100 × 100 × 100 mm cube for 3, 7, 14, 28, and 56 curing days was obtained with 10% seashell, while seashell replacement exceeded 10% declined in strength. Portland cement concrete achieved better mechanical strength when compared to steel slag seashell powder geopolymer concrete. However, steel slag seashell powder-based geopolymer gained better thermal properties than Portland cement concrete at 20% seashell replacement.
在全球范围内，不断增加的碳足迹已对生态系统和所有生物产生了负面影响。产生这些碳足迹的来源之一是水泥制造过程。因此，生产水泥替代品以减少这些碳足迹至关重要。生产地质聚合物粘结剂（GPB）就是其中一种可能性。在本研究中，硅酸钠（NaSiO）与钢渣和牡蛎壳作为前驱体一起用于生产地质聚合物混凝土（GPC）的活化剂。制备、养护并测试了混凝土材料。对GPC进行了工作性、力学性能、耐久性和特性测试。结果表明，添加贝壳会增加坍落度值。对于边长为100×100×100mm的立方体，在养护3、7、14、28和56天时，使用10%贝壳时GPC的抗压强度最佳，而贝壳替代量超过10%时强度会下降。与钢渣贝壳粉地质聚合物混凝土相比，波特兰水泥混凝土具有更好的力学强度。然而，在贝壳替代量为20%时，钢渣贝壳粉基地质聚合物比波特兰水泥混凝土具有更好的热性能。
