The most evident properties of LWAC by which it is differentiated from normal weight concrete are its lower density and better insulating potential. The aim of this study is to examine the combined effect of lightweight coarse aggregate and steel fibers on concrete’s mechanical properties. In this study, three different types of coarse aggregate (normal weight, crushed clay brick and Attapulgite) with different percentages of steel fiber (0%, 0.5%, and 1%) were used. The results show that replacing normal weight concrete with lightweight concrete leads to a decrease in unit weight, compressive strength, splitting-tensile strength and modulus of elasticity, while water absorption increases. With the increase of steel fiber ratios in the mixtures, the mechanical properties of lightweight concrete improve significantly compared with the control sample with no fiber. When 1% steel fiber is used, the splitting-tensile strength increases by about 115.6% and 55.7% and compressive strength decreases by about 7.4% and 22.2% for crushed clay brick and Attapulgite, respectively, compared with normal weight concrete.

LWAC 与普通混凝土区别的最明显的特性是其较低的密度和更好的绝缘潜力。本研究的目的是检验轻质粗骨料和钢纤维对混凝土力学性能的综合影响。在这项研究中，使用了三种不同类型的粗骨料（正常重量、碎粘土砖和凹凸棒石）和不同百分比的钢纤维（0%、0.5% 和 1%）。结果表明，用轻质混凝土代替普通重量混凝土导致单位重量、抗压强度、劈拉强度和弹性模量降低，而吸水率增加。随着混合物中钢纤维比例的增加，与不含纤维的对照样品相比，轻质混凝土的力学性能显着提高。当使用1%的钢纤维时，破碎粘土砖和凹凸棒石与普通混凝土相比，劈裂抗拉强度分别增加约115.6%和55.7%，抗压强度分别降低约7.4%和22.2%。