摘   要：对比了不同品质海砂（未处理原状基坑砂、净化基坑砂）、花岗岩机制砂的基本特性，结合海洋环境下某地铁结构混凝土的设计要求，研究了净化基坑砂、机制砂对混凝土工作性、力学性能、耐久性能、钢筋锈蚀、抗裂性能的影响。结果表明：基坑砂处理前后的Cl-含量均较低，均属于中砂，若按泥块含量分类属于Ⅱ类砂，若按含泥量、Cl-含量、贝壳含量分类则属于Ⅰ类砂；净化基坑砂具有颗粒细且均匀、表面光滑圆润等特性；XM1（净化基坑砂）、XM2（机制砂）混凝土的工作性、抗压强度基本相当，抗压强度发展规律相似，XM1混凝土的单轴拉伸性能略低于XM2混凝土，但抗氯离子渗透性能、抗渗性能、早期抗裂性能均高于XM2混凝土；采用净化基坑砂不会引起钢筋锈蚀；XM1混凝土的性能均满足海洋环境下某地铁结构混凝土的设计要求。Abstract: The basic properties of sea sand with varying qualities (untreated original foundation pit sand, purified foundation pit sand), and granite manufactured sand were compared. Based on the design requirements for concrete in a metro structure under marine conditions, the effects of purified foundation pit sand and manufactured sand on concrete workability, mechanical properties, durability, reinforcement corrosion, and crack resistance were studied. The results indicate that the Cl- content in both untreated and purified foundation pit sand is relatively low, and both are classified as medium sand. According to the mud lump content classification, they belong to Class Ⅱ sand, while according to the classification based on mud content, Cl- content, and shell content, they belong to Class Ⅰ sand. Purified foundation pit sand features fine and uniform particles with smooth and rounded surfaces. The workability and compressive strength of XM1 (purified foundation pit sand) and XM2 (manufactured sand) concrete are essentially equivalent, with similar development patterns in compressive strength. However, the uniaxial tensile performance of XM1 concrete is slightly lower than that of XM2 concrete, but its chloride ion penetration resistance, impermeability, and early crack resistance are superior. Using purified foundation pit sand does not cause reinforcement corrosion. The performance of XM1 concrete meets the design requirements for a metro structure concrete in marine conditions.

钱刚.不同品质海砂对海洋环境下地铁结构混凝土性能的影响研究[J].混凝土与水泥制品,2026(2):57-61,68. QIAN G.Reasearch on the influence of sea sand with varying qualities on the performance of metro structural concrete in marine environments[J].China Concrete and Cement Products,2026(2):57-61,68.

摘   要：基于单纯形重心设计法，研究了矿渣、石灰石粉和偏高岭土掺量对碱激发全固废超高性能混凝土（Alkali-activated all-solid waste ultra-high performance concrete，A-UHPC）力学性能、抗氯离子侵蚀性能、干燥收缩和微观结构的影响，并建立了抗压强度、抗氯离子渗透性能和干燥收缩性能预测模型。结果表明：石灰石粉的成核效应有效提高了体系的水化反应效率；适量偏高岭土能提高C-A-S-H凝胶和N-A-S-H凝胶产物的聚合度，优化孔结构；石灰石粉和偏高岭土的协同作用可促进水化进程，优化胶凝物质微观结构；A-UHPC的7 d、28 d抗压强度预测模型、氯离子渗透深度、氯离子扩散系数和干燥收缩性能预测模型均具有较高的精度和显著性；基于力学和耐久性能优化，并兼顾降低矿渣消耗的目标，A-UHPC三元胶凝材料的推荐配合比为矿渣掺量50%~70%、偏高岭土掺量10%~30%、石灰石粉掺量10%~30%。Abstract：The effects of slag, limestone powder, and metakaolin content on the mechanical properties, chloride ion penetration resistance, drying shrinkage, and microstructure of alkali-activated all-solid waste ultra-high performance concrete (A-UHPC) were investigated on the basis of the simplex centroid design method, and predictive models for compressive strength, chloride ion penetration resistance, and drying shrinkage were established. The results show that the nucleation effect of limestone powder effectively enhances the hydration reaction efficiency of the system, the appropriate content of metakaolin improves the polymerization degree of C-A-S-H and N-A-S-H gel products and optimizes the pore structure, and the synergistic effect of limestone powder and metakaolin promotes the hydration process and optimizes the microstructure of cementitious materials. The prediction models for 7 d and 28 d compressive strength, chloride ion penetration depth, chloride ion diffusion coefficient, and drying shrinkage rate of A-UHPC have high accuracy and significance. Based on the optimization of mechanical properties and durability, and considering the goal of reducing slag consumption, the recommended mix proportion of A-UHPC ternary cementitious materials is as follows: slag content of 50%~70%, metakaolin content of 10%~30%, and limestone powder content of 10%~30%.

梅支耀,唐翰林,蔡卫东,等.碱激发全固废超高性能混凝土（A-UHPC）的优化设计与性能研究[J].混凝土与水泥制品,2026(2):62-68. MEI Z Y,TANG H L,CAI W D,et al.Optimization design and performance study of alkali-activated all-solid waste ultra-high performance concrete (A-UHPC)[J].China Concrete and Cement Products,2026(2):62-68.

孙宝昌,郭春志,陈兆志,等.冻融循环作用下路基再生混凝土的力学性能及能量演化规律研究[J].混凝土与水泥制品,2026(2):69-75. SUN B C,GUO C Z,CHEN Z Z,et al.Study on mechanical properties and energy evolution of roadbed recycled concrete under freeze-thaw cycles[J].China Concrete and Cement Products,2026(2):69-75.

雷利剑,杨起,张士前,等.水泥基沙漠砂免烧砖的制备及性能研究[J].混凝土与水泥制品,2026(2):76-80,85. LEI L J,YANG Q,ZHANG S Q,et al.Preparation and performance study of cement-based unburned bricks with desert sand[J].China Concrete and Cement Products,2026(2):76-80,85.

摘   要：对比研究了普通混凝土（Normal concrete，NC）和再生骨料混凝土（Recycled aggregate concrete，RAC）在氯盐单因素侵蚀和氯盐侵蚀-钢筋锈蚀耦合作用下的损伤演变规律。结果表明：在氯盐单因素侵蚀下，随着干湿循环时间的延长，NC和RAC的抗压强度均先增后降，但均高于未侵蚀对照组；在氯盐侵蚀－钢筋锈蚀耦合作用下，随着干湿循环时间的延长，NC和RAC的平均、最大锈胀裂缝宽度及钢筋的实际锈蚀率均增大，抗压强度基本降低；钢筋锈蚀引发的体积膨胀效应会加剧混凝土内部微裂纹扩展，导致力学性能退化；基于平均锈胀裂缝宽度的NC和RAC抗压强度预测模型，其拟合相关系数分别为0.949 4和0.966 4，模型精度较高，具有一定的工程适用性。Abstract： The damage evolution patterns of normal concrete (NC) and recycled aggregate concrete (RAC) were compared under single-factor chloride salt erosion and the coupled action of chloride erosion and reinforcement rust. The results show that under single-factor chloride salt erosion, with the dry-wet cycle duration extends, the compressive strength of both NC and RAC first increases and then decreases, but remains higher than that of the non-erosion control group. Under the coupled action of chloride erosion and reinforcement rust, with the dry-wet cycle duration extends, the average and maximum rust crack widths of NC and RAC, along with the actual corrosion rate of reinforcement increase, while compressive strength generally decreases. The volume expansion effect caused by reinforcement rust accelerates the propagation of microcracks within concrete, resulting in mechanical property degradation. The fitting coefficients of the compressive strength prediction models of NC and RAC based on the average rust crack width are 0.949 4 and 0.966 4, respectively. The models have high accuracy and are applicable to engineering practice.

高晓悦,高明显,程建波,,等.氯盐侵蚀-钢筋锈蚀耦合作用下再生骨料混凝土抗压强度预测模型[J].混凝土与水泥制品,2026(2):81-85. GAO X Y,GAO M X,CHENG J B,et al.Compressive strength prediction model of recycled aggregate concrete under the coupled action of chloride erosion and reinforcement rust[J].China Concrete and Cement Products,2026(2):81-85.