This study explores the development of fibre reinforced structural lightweight aggregate concrete (SLWAC) using sintered fly ash aggregate (SFA) as coarse aggregate. SFA is manufactured from fly ash, an industrial by-product, thus making SLWAC a sustainable building material. SLWAC of density 1800 kg/m³ is developed with and without the addition of synthetic polyolefin (macro and micro) fibres to achieve a target compressive strength of 40 MPa. The main objective of this study is to understand the mechanical properties of SLWAC made of SFA and the influence of fibres in improving mechanical properties of SLWAC. The effect of monofilament macro-synthetic fibre dosages of 0.2%, 0.4%, and 0.6%, as well as the fibrillated micro fibres of 0.02% on the mechanical properties of SLWAC is studied. Tests were carried out for understanding the stress-strain behaviour under compression, split tensile strength, and fracture behaviour under flexure. Digital image correlation technique is used to study the crack propagation in fracture and splitting tension tests. A significant improvement in flexural strength, splitting tensile strength and toughness of SLWAC is observed due to the addition of synthetic fibres. Fibres significantly contributed to load resistance by arresting both micro and macro cracks. Thus, with the help of synthetic fibres addition in SLWAC, the desirable mechanical properties for structural applications such as strength and ductility can be achieved at reduced density.

这项研究探索了以烧结粉煤灰骨料（SFA）作为粗骨料的纤维增强结构轻质骨料混凝土（SLWAC）的开发。SFA由工业副产品飞灰制造，因此使SLWAC成为可持续的建筑材料。密度1800 kg / m ^3的SLWAC在添加和不添加合成聚烯烃（宏观和微观）纤维的情况下开发出的“聚氯乙烯”可实现40 MPa的目标抗压强度。这项研究的主要目的是了解由SFA制成的SLWAC的机械性能以及纤维对改善SLWAC的机械性能的影响。研究了0.2％，0.4％和0.6％的单丝大分子合成纤维用量以及0.02％的原纤化微纤维对SLWAC力学性能的影响。进行测试以了解在压缩下的应力-应变行为，断裂抗张强度和在挠曲下的断裂行为。数字图像相关技术用于研究裂缝和断裂拉力测试中的裂纹扩展。弯曲强度的显着改善，由于添加了合成纤维，观察到了SLWAC的断裂拉伸强度和韧性。纤维通过阻止微观和宏观裂纹而显着提高了抗负荷能力。因此，借助于在SLWAC中添加合成纤维，可以以降低的密度实现用于结构应用的期望的机械性能，例如强度和延展性。