Based on orthogonal experiments, the ultra-high-strength lightweight concrete (UHPLC) with a strength exceeding 100 MPa was prepared using pottery sand (PS) and hollow glass microspheres (HGM) as the weight-reducing material and steel fibres as reinforcement. Through workability, apparent density, strength and early autogenous shrinkage tests, as well as scanning electron microscopy examinations, the effect of various material parameters on the basic performance of UHPLC was investigated, and their mechanisms were explored. The results revealed the optimal mix ratio of ordinary Portland cement : fly ash : silica fume : PS : HGM = 1 : 0.200 : 0.133 : 0.533 : 0.067, a water/binder ratio of 0.16 and a volume ratio of steel fibres of 2%. Under steam curing at 90°C for 48 h, the prepared UHPLC had an apparent density of 2031 kg/m³, compressive/flexural strengths of 112/16 MPa a slump/expansion of 260/590 mm, and specific strength of 0.055, achieving the goal of light weight and high strength. As the filler of composite materials, HGM can achieve lightweight and high strengthening of cement-based materials. HGM had a large water demand, increasing the autogenous shrinkage of UHPLC to a certain extent. The incorporation of steel fibres significantly increased the strength and apparent density of UHPLC, and its high elastic modulus inhibited the UHPLC shrinkage.

中文翻译：

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超高性能轻质混凝土的制备及性能

基于正交试验，以陶砂（PS）和空心玻璃微球（HGM）为减重材料，钢纤维为增强体，制备了强度超过100 MPa的超高强轻质混凝土（UHPLC）。通过和易性、表观密度、强度和早期自收缩试验，以及扫描电子显微镜检查，研究了各种材料参数对UHPLC基本性能的影响，并探讨了其作用机理。结果表明，普通硅酸盐水泥：粉煤灰：微硅粉：PS：HGM = 1：0.200：0.133：0.533：0.067，水胶比为0.16，钢纤维体积比为2%的最佳配合比。在 90°C 蒸汽固化 48 h 下，制备的 UHPLC 的表观密度为 2031 kg/m³、抗压抗弯强度112/16 MPa，坍落度/膨胀度260/590 mm，比强度0.055，达到了轻量化、高强化的目的。HGM作为复合材料的填料，可实现水泥基材料的轻量化、高强化。HGM需水量大，一定程度上增加了UHPLC的自收缩。钢纤维的加入显着提高了 UHPLC 的强度和表观密度，其高弹性模量抑制了 UHPLC 的收缩。