超轻高强水泥基复合材料（ULCC）是一种由高强水泥浆体和均布其中的漂珠组成的混合物，其密度仅为1450kg/m3，但抗压强度高达60MPa。ULCC可作为芯材取代聚氨酯弹性体用于钢夹层结构。相同承载力条件下，ULCC钢夹层结构的自重仅为钢结构的44%，目标应用于船舶、油气开发平台等海洋工程装备。本项目将提出基于多元粉体最紧密堆积设计模型的ULCC配合比计算机辅助设计方法，以进一步提升其力学性能和实现ULCC配合比设计的科学化。申请人将首先构建多分散粒子（一元粉体）的最紧密堆积密度的数值计算模型，然后构建多元粉体最紧密堆积设计模型，并基于硅灰-超细粉-水泥三元胶凝体系构建关于具备更高比强度和不同设计密度的新型ULCC的配合比计算机辅助设计方法。最后利用国内原材料制备一系列新型ULCC，并研究其力学性能（轴压、轴拉应力应变全曲线）及本构关系，为新型ULCC应用为钢夹层结构的芯材提供基础支持。

Ultra lightweight cement composite (ULCC) is a type of mixture composed of high strength cement paste and cenospheres homogeneously distributing inside. The ULCC processes a compressive strength of 60MPa under a density of 1450kg/m3. The ULCC can be used to replace the polyurethane elastomer as the core material in the sandwich plate system (SPS). Given same loading capacity, the self-weight of the SPS with 1450kg/m3 ULCC as core material is only 44% of the steel construction. The SPS with ULCC as core material aims at the application in manufacturing the offshore structures, for example, working platforms in offshore & marine structures, ship building etc. In this project, based on a maximum packing density optimization model for multi-powders, a computer aided design method for mix design of ULCC mixtures will be proposed to further improve the mechanical properties of ULCC and design the mix proportion of ULCC more scientifically. Firstly, the applicant will develop a numerical model for calculation of maximum packing density of polydisperse particles (single type of powder) and then develop a maximum packing density optimization model for the multi-powders. Based on these models and a silica fume/ultra fine powder/cement ternary cementitious material mixtures, a computer aided design method will be developed for the new generation of ULCC with higher specific strength and different levels of densities. A series of ULCCs will be developed by using raw materials from our country. Studies will be conducted to investigate the mechanical properties, including compressive and tensile stress-strain curves, and then the constitutive relations. All these studies will provide a basic support for the application of ULCC as core materials in SCS sandwich construction.