摘 要：为了研究不同纤维对超高性能混凝土（UHPC）力学性能和抗冲磨性能的影响，分别在UHPC中掺入不同体积分数的钢纤维和 PVA纤维，进行了抗压、抗拉及抗冲磨试验。结果表明，钢纤维对UHPC抗压性能的提升效果优于PVA纤维；钢纤维与PVA纤维均能显著提升UHPC的抗拉性能；PVA纤维对UHPC抗冲磨性能的提升效果优于钢纤维。 Abstract： In order to study the influence of different fibers on the mechanical properties and impact wear resistance of Ultra-high performance concrete (UHPC), different volume fractions of steel fiber and PVA fiber were mixed in UHPC to carry out compression, tensile and impact wear resistance tests. The results show that the effect of steel fiber on UHPC compression performance is better than PVA fiber. Steel fiber and PVA fiber can significantly improve the tensile properties of UHPC. The effect of PVA fiber on UHPC impact wear resistance is better than steel fiber.

苏骏,李磊,吴鹏,等.钢纤维与PVA纤维对超高性能混凝土强度及抗冲磨性能影响研究[J].混凝土与水泥制品,2019(11):39-42. SU J,LI L,WU P,et al.Effect of Steel Fiber and PVA Fiber on Strength and Abrasion Resistance Performance of Ultra High Performance Concrete[J].China Concrete and Cement Products,2019(11):39-42.

为了提高盾构隧道内预埋件的防腐抗渗能力，结合实际工程，考虑选材、几何形状等因素，设计了预埋陶瓷螺母，并预埋在管片混凝土结构层中，与传统C型预埋槽道进行了对比分析，其力学性能和使用功能能满足设计要求，经济性上也存在较大优势。 Abstract: In order to improve the anti-corrosion and anti-seepage ability of shield tunnel, combined with the actual project, considering the factors of material selection and geometry, the embedded ceramic nuts are designed and embedded in the segment concrete structure layer. Compared with the traditional C-type embedded channel, the mechanical properties and use functions of the embedded channel can meet the design requirements, and there are also greater advantages in economy.

明廷洪,余晓文,滕耀华,等.高温饱和蒸汽环境下管桩混凝土的碱骨料反应研究[J].混凝土与水泥制品,2019(11):33-35. MING T H,YU X W,TENG Y H,et al.Study on the Alkali Aggregate Reaction of Concrete for Piles under High Temperature Saturated Steam Environment[J].China Concrete and Cement Products,2019(11):33-35.

摘 要：从碱骨料反应的定义、分类、条件、机理、预防措施等方面介绍了碱骨料反应的原理。利用白云岩制作了两组胶砂试件，一组试件胶材采用纯水泥，另一组掺入10%的硅灰等量替代水泥，并在水泥标准养护箱中养护24 h，脱模后在常温蒸汽中养护6 h，再到高温蒸压养护8 h。通过骨料碱活性试验方法中的评定方式对结果进行评定。试验结果表明，碱骨料反应在高温环境下可快速发生，且硅灰掺入量为10%时，能够有效抑制碱骨料反应。 Abstract: The definition and classification of alkali aggregate reaction, reaction conditions, mechanism and preventive measures were introduced. Two groups of mortar specimens were made from dolomite. One group was made of pure cement. The other group was mixed with 10% silica fume to replace cement. The cement was maintained in standard curing box for 24 h. After demoulding, it was maintained in normal temperature steam for 6 h, and then in high temperature steam for 8 h. The results were evaluated by the evaluation method of the alkali activity test of aggregate. The results show that the alkali aggregate reaction can occur quickly under high temperature and the alkali aggregate reaction can be effectively inhibited by adding 10% silica fume.

余洪方,钮如嵩.国内预应力钢筒混凝土管发展面临问题的几点思考与对策[J].混凝土与水泥制品,2019(11):30-32. YU H F,NIU R S.Thoughts and Countermeasures on Problems Faced by the Development of Prestressed Concrete Cylinder Pipes In China[J].China Concrete and Cement Products,2019(11):30-32.

摘 要：基于目前国内预应力钢筒混凝土管（PCCP）发展面临的几大问题，结合具体工程，从产品结构设计、主要原材料采购、生产质量控制、铺设使用场合和运行管理等方面提出了相应建议，以利于促进PCCP行业健康有序发展。 Abstract: Based on several major problems faced by the development of PCCP in China, and combined with specific projects, the corresponding suggestions are put forward from the aspects of product structure design, purchase of main raw materials, quality control of production, laying and using occasions and operation management to promote the healthy and orderly development of PCCP industry.

姜正平,宋旭艳,明维.矿物掺合料对混凝土内部碱度影响研究[J].混凝土与水泥制品,2019(11):25-29. JIANG Z P,SONG X Y,MING W.Effect of Mineral Admixture on the Internal Alkalinity of Concrete[J].China Concrete and Cement Products,2019(11):25-29.

摘 要：通过掺加粉煤灰、矿粉、磨细石英砂等矿物掺合料制备了不同强度等级的混凝土，研究了矿物掺合料掺量、种类以及水灰比、混凝土内部不同深度对混凝土内部碱度的影响，并对比分析了不同矿物掺合料混凝土的抗硫酸盐侵蚀性能。研究结果表明，适量的矿物掺合料不仅可节约水泥，优化混凝土结构，提高混凝土抗硫酸盐侵蚀能力，同时对混凝土内部碱度影响较小。混凝土内部碱度分布基本均匀，不同深度的孔溶液中pH值基本一致；且混凝土的水灰比对其碱度几乎没有影响。 Abstract: The concrete with different strength grades was prepared by adding mineral admixtures such as fly ash, slag and ground quartz sand. The effects of mineral admixture content and type, W/C and different depth of concrete on the internal alkalinity of concrete were studied. The sulfate corrosion resistance of concrete with different mineral admixtures was compared. The results show that appropriate mineral admixtures can not only save cement, optimize concrete structure and improve the sulfate resistance of concrete, but also have little influence on the internal alkalinity of concrete. The alkalinity distribution in concrete is basically uniform, and the pH value in pore solution of different depths is basically the same, and the water cement ratio in concrete has little effect on its alkalinity.

董超,冯晨,杨进波,等.机制砂质量指标及对混凝土性能的影响分析[J].混凝土与水泥制品,2019(11):21-24. DONG C,FENG C,YANG J B,et al.Analysis of the Quality Index of Manufactured Sand and Its Influence on Concrete Performance[J].China Concrete and Cement Products,2019(11):21-24.

摘 要：机制砂作为天然砂替代品，在颗粒形貌、石粉含量等质量指标上均不同于天然砂，因此，导致混凝土性能存在差异。本文在分析国内外标准规范的基础上，研究了不同规范中机制砂的定义及质量指标，叙述了机制砂质量指标对混凝土性能的影响，进而为机制砂的工程应用提出建议。 As a substitute for natural sand, manufactured sand is different from natural sand in quality indexes such as particle morphology and stone powder content, which will lead to differences in concrete performance. Based on the analysis of standards and specifications at home and abroad, the definition and quality index of manufactured sand in different specifications are studied. The influence of quality index of manufactured sand on performance of concrete is summarized, and some suggestion for engineering applications of manufactured sand are put forward.

陈登,张钰晖,高世明,等.改性Ⅲ级粉煤灰对混凝土强度和自收缩的影响[J].混凝土与水泥制品,2019(11):17-20. CHEN D,ZHANG Y H,GAO S M,et al.Influence of Modified Grade Ⅲ Fly Ash on Strength and Autogenous Shrinkage of Concrete[J].China Concrete and Cement Products,2019(11):17-20.