This paper presents an experimental investigation on lightweight aggregate mortars containing high volume cement replacement materials. For this purpose, expanded perlite (EP) and expanded vermiculite (EV) are used as the lightweight aggregate (at sand replacements of 50% and 100%), while ground granulated blast furnace slag (GGBS) (35% and 70% replacement level) and fly ash (25% and 50% replacement level) are adopted as the supplementary cementitious materials (SCMs). The results showed that EP is beneficial for improving the flow of fresh mortar, and soft mortar (flow diameter > 200 mm) can be produced by using EP in SCM-cement blends. Both EP and EV can be utilised to produce lightweight mortar in the density range of 1400–1700 kg/m³ and 900–1100 kg/m³ at 50% and 100% sand replacements, respectively. Although the lightweight aggregates resulted in compressive strength decrease, the developed lightweight mortar using 50% EP (with or without SCMs) can be classified as type N mortar (compressive strength exceeding 5.17 MPa) while those prepared with 100% EP as well as 50% EV can be categorised as type O mortar. Response surface methodology carried out in this study also demonstrated that the mathematical equations can suitably estimate the studied performances of the lightweight mortars.

本文介绍了一种含有大量水泥替代材料的轻质骨料砂浆的实验研究。为此，将膨胀珍珠岩（EP）和膨胀ver石（EV）用作轻质骨料（砂替代量为50％和100％时），而磨碎的高炉矿渣（GGBS）（替代量为35％和70％） ）和粉煤灰（替代含量分别为25％和50％）用作辅助水泥材料（SCM）。结果表明，EP有利于改善新鲜砂浆的流动性，在SCM-水泥共混物中使用EP可以生产软砂浆（流动直径> 200 mm）。EP和EV均可用于生产密度范围为1400-1700 kg / m ³和900-1100 kg / m ^3的轻质砂浆分别更换50％和100％的砂子。尽管轻质骨料导致抗压强度降低，但使用50％EP（有或没有SCM）开发的轻质砂浆可以归为N型砂浆（抗压强度超过5.17 MPa），而用100％EP和50％EP制备的砂浆EV可以归为O型砂浆。在这项研究中进行的响应面方法还证明，数学方程式可以适当地估计轻质砂浆的研究性能。