摘   要：分别研究了矿物掺合料（粉煤灰、矿渣）、养护方式对普通混凝土比强度的影响；陶粒、橡胶颗粒、聚苯颗粒对轻骨料混凝土比强度的影响以及陶砂、钢纤维对(超)高强混凝土比强度的影响。结果表明：适量掺入矿渣，普通混凝土28 d的比强度提高更大；轻骨料混凝土的比强度分别随陶粒、橡胶颗粒、聚苯颗粒取代率的增加而降低，其中，陶粒对轻骨料混凝土比强度的不利影响相对较小；当掺入1.5%的钢纤维和18%的陶砂时，（超）高强混凝土的比强度提升幅度最大。 Abstract: The influence of mineral admixtures (fly ash, slag) and curing methods on the specific strength of ordinary concrete, and the influence of ceramsite, rubber particles, and polystyrene particles on the specific strength of lightweight aggregate concrete, and the influence of ceramic sand and steel fiber on the (super)high-strength concrete were studied. The results show that the proper amount of slag can improve the specific strength of ordinary concrete at 28 d age. And the specific strength of lightweight aggregate concrete decreases as the volume of aggregates replaced by ceramsite, rubber particles, and expanded polystyrene increases. The adverse effect of ceramsite on the specific strength of lightweight aggregate concrete is relatively small. When mixed with 1.5% steel fiber and 18% ceramic sand, the specific strength of (super) high-strength concrete increases the most.

周倩倩,谢友均,龙广成,等.混凝土比强度的主要影响因素研究[J].混凝土与水泥制品,2021(11):39-43. ZHOU Qian-qian, XIE You-jun, LONG Guang-cheng,et al.Research on Main Influencing Factors of Specific Strength of Lightweight High Strength Concrete[J].China Concrete and Cement Products,2021(11):39-43.

摘   要：采用物理发泡技术制备了硫氧镁水泥复合吸波多孔材料，并对其进行了孔径特征和电磁参数测试。基于有效介质理论和传输线理论，模拟了此多孔材料对8~18 GHz频段电磁波的吸收性能。结果表明：多孔材料的孔隙率和气孔的平均孔径随设计密度的增大而减小；多孔结构可以降低材料的有效介电常数，提高阻抗匹配性能；数值模拟吸波性能曲线的变化规律与测试结果基本一致。 Abstract: A composite microwave absorbing material of porous magnesium oxysulfide cement was prepared by physical foaming technology. The pore size characteristics and electromagnetic parameters of porous materials were measured and analyzed. Based on the the effective medium theory and transmission line theory, the electromagnetic wave absorption performance of porous materials in the 8~18 GHz frequency band was simulated. The results show that with the increasing density, the porosity and the average pore size of the pores in the porous material decrease. The porous structure can reduce the effective dielectric constant of the material and improve the impedance matching performance. The curve of absorbing property of numerical simulation materials is consistent with the test results.

何楠,陈乐,周旺,等.多孔结构对硫氧镁水泥吸波性能的影响[J].混凝土与水泥制品,2021(11):34-38. HE N,CHEN L,ZHOU W,et al.The Influence of Porous Structure on the Microwave Absorbing Properties of Magnesium Oxysulfide Cement[J].China Concrete and Cement Products,2021(11):34-38.

摘   要：开展了养护温度（20 ℃、40 ℃、60 ℃）和粉煤灰掺量（10%、20%、30%）对掺钙镁复合膨胀剂（CM）砂浆膨胀效能的影响研究，并结合微观测试手段，分析了其影响机理。结果表明：CM对温度较为敏感，养护温度越高，CM水化速率越快，膨胀量增幅越大；20~60 ℃时，粉煤灰可显著抑制CM的膨胀，且粉煤灰掺量越大，对CM的抑制作用越明显；CM中CaO组分反应速率较快，其水化产物Ca(OH)2有效促进了MgO的水化。 Abstract: The effect of curing temperature(20 ℃, 40 ℃, 60 ℃) and fly ash content(10%、20%、30%) on the expansion performance of calcium-magnesium composite expansion agent(CM) mortar was carried out. Through the use of a series of micro-testing methods, the influence mechanism was analyzed. The results show that CM is more sensitive to temperature. The higher the curing temperature, the faster the hydration rate of CM, the greater the increase in expansion. When the curing temperature is 20~60 ℃, the expansion of CM is significantly inhibited by fly ash, and the greater the amount of fly ash, the more obvious the expansion efficiency of CM is inhibited. The CaO component of CM has a faster reaction rate. The hydration product Ca(OH)2 is an alkaline environment created by MgO, which promotes the hydration of MgO. 

盛智博,于方,肖尹文,等.养护温度与粉煤灰掺量对钙镁复合膨胀剂膨胀效能的影响[J].混凝土与水泥制品,2021(11):29-33. SHENG Z B,YU F,XIAO Y W,et al.Effect of Curing Temperature and Fly Ash Content on the Expansion Performance of Calcium-magnesium Composite Expansion Agent[J].China Concrete and Cement Products,2021(11):29-33.

摘   要：为研究应变率和尺寸效应对透水混凝土受压动力性能的影响，设置了十种应变率和三种立方体尺寸的试件，对透水混凝土展开单轴受压力学性能试验研究。结果表明：随着应变率的增加，透水混凝土的抗压强度逐渐增大；随着立方体试件边长的增大，应变率对透水混凝土抗压强度的增加幅度逐渐减小，透水混凝土的抗压强度逐渐减小；受应变率增加的影响，尺寸效应对透水混凝土抗压强度的减小幅度逐渐增加；提出的尺寸效应律模型方程能够较好地表述不同应变率下透水混凝土抗压强度的尺寸效应；基于应变率和尺寸效应参数，还提出了透水混凝土抗压强度计算方程。 Abstract: In order to explore the influence of strain rate and size effect on the dynamic performance of pervious concrete under compression, ten different loading strain rates and three different cube sizes specimen were set up. The uniaxial compression performance tests of pervious concrete were carried out. The results show that with the increase of strain rate, the compressive strength of pervious concrete gradually increases. With the increase of cube concrete specimen side length, the increase of strain rate on the compressive strength of pervious concrete gradually decreases, and the compressive strength of pervious concrete gradually decreases. Affected by the increase of strain rate, the size effect on the reduction of the compressive strength of pervious concrete gradually increases. The proposed size effect law model equation can better express the size effect of the compressive strength of pervious concrete under different strain rates. Based on the strain rate and size effect parameters, the calculation equation of the compressive strength of pervious concrete is proposed.

祝秀琴,李维丽,张丽,等.应变率和尺寸效应对透水混凝土受压动力性能的影响[J].混凝土与水泥制品,2021(11):23-28. ZHU X Q,LI W L,ZHANG L,et al.The Influence of Strain Rate and Size Effect on the Dynamic Performance of Pervious Concrete Under Compression[J].China Concrete and Cement Products,2021(11):23-28.

摘   要：总结分析了水泥品种、掺合料及拌和物稠度对3D打印混凝土性能的影响。对比分析了不同水泥品种以及掺合料的3D打印混凝土性能的差异，提出了不同建造工况下水泥品种、掺合料的选择方法，综述了拌和物稠度在3D打印混凝土制备中的重要作用。此外，还提出了3D打印混凝土材料在研发中所面临的问题和挑战，并对未来3D打印混凝土的研究方向进行了展望。 Abstract: The impact of cement types, admixtures and consistency of the mixture on the properties of 3D printed concrete is summarized and analyzed. The performance differences of 3D printed concrete with different types of cement and admixtures are compared and analyzed. The selection methods of cement varieties and admixtures under different construction conditions are proposed. The important role of the consistency of the mixture in the preparation of 3D printed concrete is summarized. The problems and challenges of 3D printed concrete materials in the development are also proposed, and the future research direction of 3D printed concrete is pointed out.

张敏霞,范开均,徐平,等.3D打印混凝土性能的影响因素及研究进展[J].混凝土与水泥制品,2021(11):18-22. ZHANG M X,FAN K J,XU P,et al.Influencing Factors and Research Progress on the Properties of 3D Printed Concrete[J].China Concrete and Cement Products,2021(11):18-22.

摘   要：基于最大湿堆积密度理论优化设计超高性能混凝土（UHPC）。首先，设计了25组试验工况，分别计算出每组工况变量与最大湿堆积密度的关系，建立了最大湿堆积密度预测模型。然后，用石英粉部分替代水泥，研究了不同替代率对UHPC流动性、力学性能的影响。结果表明：预测模型与试验结果具有较好的吻合性；UHPC的流动度随着石英粉掺量的增加而增加，且当石英粉掺量为20%时，UHPC的抗压强度和抗折强度最大。此外，生态评价表明，使用石英粉部分替代水泥生产UHPC，可显著降低对环境的影响。 Abstract: Mix proportion of ultra-high performance concrete (UHPC) was optimal designed based on maximum wet packing density theory. Firstly, 25 groups of test conditions were designed, the relationship between each working condition variable and the maximum wet packing density was calculated, and the prediction model of the maximum wet packing density was established. Then, quartz powder was used to partially replace cement, and the effects of different substitution rates on the fluidity and mechanical properties of UHPC were studied. The results show that the prediction model is in good agreement with the experimental results. The fluidity of UHPC increases with the increase of quartz powder content. When the content of quartz powder is 20%, the compressive strength and flexural strength of UHPC are the largest. In addition, the ecological evaluation shows that using quartz powder to partially replace cement to produce UHPC can significantly reduce the impact on the environment.

韩建军,席壮民,卢鹏,等.基于湿堆积密度方法优化设计超高性能混凝土[J].混凝土与水泥制品,2021(11):12-17. HAN J J,XI Z M,LU P,et al.Optimization Design of Ultra-high Performance Concrete Based on Wet Packing Density Method[J].China Concrete and Cement Products,2021(11):12-17.