Njoku Chioma Emmanuella, Ekeleme Anthony Chibuzo, Ekwueme Benjamin Nnamdi, Onuoha Chukwudike, Onuzulike Ebube Prince, Chibundu Wisdom, Okon Kooffreh, Ozoh Chibuike Christopher
Department of Materials and Metallurgical Engineering, Federal University of Technology Owerri, P.M.B 1526, Owerri, Imo State, Nigeria.
Department of Civil Engineering, Abia State University, P.M.B 2000, Uturu, Abia State, Nigeria.
Environ Sci Pollut Res Int. 2024 Oct 2. doi: 10.1007/s11356-024-34990-4.
The usage of plentiful raw discarded resources in the manufacturing of concrete has proven to be a sustainable and environmentally beneficial method of making concrete for a variety of purposes. In this study, the physical and mechanical properties of concrete made by partially and fully substituting fine aggregates and ordinary Portland cement with periwinkle shell ash and quarry dust (5%, 10%, 15%, 20%, and 100%), respectively, were examined. The ratio of water to cement utilized for the concrete mixture, 1:2:4, was 0.60. Fresh concrete underwent a slump test, and then 150-mm cubes of cured concrete were subjected to density, compressive strength tests, and morphological and structural property characterizations. The concrete without the waste materials gave an optimum compressive strength of 22.9 N/mm as opposed to those that were partially replaced, having 18.8-15.1 N/mm. The concrete samples with full replacements of periwinkle shell ash and quarry dust have compressive strengths lower than 13.8 N/mm. All the concrete samples produced with partial and full replacements are in the class of normal concrete, but only those with partial replacements of up to 20% can be utilized for load-bearing and non-load-bearing applications. Opting for these alternative waste materials implies taking steps towards creating a cleaner and healthier planet for now and the future.
在混凝土制造中使用大量废弃原材料已被证明是一种可持续且对环境有益的方法，可用于制造各种用途的混凝土。在本研究中，分别用长春花贝壳灰和采石场粉尘（5%、10%、15%、20%和100%）部分或完全替代细骨料和普通硅酸盐水泥制成的混凝土的物理和力学性能进行了研究。混凝土混合物所用的水灰比为1:2:4，即0.60。对新拌混凝土进行坍落度试验，然后对150毫米的养护混凝土立方体进行密度、抗压强度试验以及形态和结构性能表征。未使用废料的混凝土的最佳抗压强度为22.9牛/平方毫米，而部分替代的混凝土的抗压强度为18.8 - 15.1牛/平方毫米。完全用长春花贝壳灰和采石场粉尘替代的混凝土样品的抗压强度低于13.8牛/平方毫米。所有部分和完全替代制成的混凝土样品都属于普通混凝土类别，但只有部分替代量高达20%的混凝土可用于承重和非承重应用。选择这些替代废料意味着朝着为现在和未来创造一个更清洁、更健康的星球迈出了步伐。
