Behera Diptikar, Liu Kuang-Yen, Gopalakrishnan Dineshkumar
Department of Civil Engineering, National Cheng Kung University, Tainan 701, Taiwan.
Department of Civil Engineering, Vaagdevi College of Engineering, Warangal 506005, India.
Materials (Basel). 2022 Jul 20;15(14):5051. doi: 10.3390/ma15145051.
To create cost-effective structures, the modern construction industry has sought to reduce the dead load of buildings. Lightweight concrete is a quick way to reduce dead load. The current study is primarily concerned with identifying modern substitutes for coarse aggregate likely to aid in waste management and offer potential alternatives to the most exploited natural resources. According to ACI C 39-M, this study developed a novel lightweight hybrid fiber-reinforced concrete (LWHFRC) with a density of less than 1825 kg/m and compressive strength of 50 to 75 MPa. Ordinary Portland cement (53 Grade) was mixed with fly ash, silica fume, and GGBS. Sintered fly ash aggregate (SFA) and palm oil shell aggregate (POS) were used as coarse aggregates. Hooked steel fibers and polyvinyl alcohol fibers were combined in a hybrid form to improve crack propagation properties at the initial and subsequent stages. The water-to-binder ratio was kept constant at 0.30 to 0.35 with a 1% superplasticizer. Four volume fractions of hybrid fibers (both steel and PVA with Vf = 0%, 1%, 1.5%, and 2%) were added. In addition, XRD, SEM, EDS, and EDS mapping tests were performed to finalize the material's chemical composition and crystalline structure. Furthermore, beams and cylinders were tested to determine the modulus of rupture, which was determined to be between 9.5 and 14 MPa by ACI code C 1609-M, and indirect tensile strength, achieved as 10 to 14 MPa by ACI code C 496-M. The researcher altered the modulus of elasticity (Ec) formula for lightweight concrete and discovered a relationship between fc' and fcb, fc' and fspt, and fcb and fspt. Finally, ANOVA and regression tests were run to check the significance of the experiment. The cost analysis revealed that the cost of LWHFRC increased by approximately 16.46%, while the strength increased by 55.98% compared to regular concrete.
为了构建具有成本效益的结构，现代建筑业一直在寻求减轻建筑物的自重。轻质混凝土是减轻自重的一种快捷方法。当前的研究主要关注于确定可能有助于废物管理的粗骨料现代替代品，并为最常被开采的自然资源提供潜在替代方案。根据美国混凝土学会（ACI）C 39-M标准，本研究开发了一种新型轻质混杂纤维增强混凝土（LWHFRC），其密度小于1825 kg/m³，抗压强度为50至75 MPa。普通硅酸盐水泥（53级）与粉煤灰、硅灰和粒化高炉矿渣（GGBS）混合。烧结粉煤灰骨料（SFA）和棕榈油壳骨料（POS）用作粗骨料。钩状钢纤维和聚乙烯醇纤维以混杂形式组合，以改善初始阶段和后续阶段的裂缝扩展性能。水胶比保持在0.30至0.35之间，并添加1%的高效减水剂。添加了四种体积分数的混杂纤维（钢纤维和聚乙烯醇纤维，Vf分别为0%、1%、1.5%和2%）。此外，进行了X射线衍射（XRD）、扫描电子显微镜（SEM）、能谱分析（EDS）和能谱映射测试，以确定材料的化学成分和晶体结构。此外，对梁和圆柱体进行了测试，以确定抗折强度，根据ACI规范C 1609-M，抗折强度在9.5至14 MPa之间，间接抗拉强度根据ACI规范C 496-M达到10至14 MPa。研究人员改变了轻质混凝土的弹性模量（Ec）公式，并发现了fc'与fcb、fc'与fspt以及fcb与fspt之间的关系。最后，进行了方差分析（ANOVA）和回归测试，以检验实验的显著性。成本分析表明，与普通混凝土相比，LWHFRC的成本增加了约16.46%，而强度提高了55.98%。
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