摘 要：将不同钢粒掺量（0、5%、10%、20%）和1.2 kg/m3聚丙烯纤维掺入再生骨料取代率为100%的再生混凝土中，研究其工作性和力学性能。结果表明，钢粒可以有效改善聚丙烯纤维再生混凝土的流动性，且对其保水性能影响较小；不同钢粒掺量会引起聚丙烯纤维再生混凝土抗压强度波动，随着钢粒掺量的增加其劈拉强度有一定降低，较优的钢粒掺量为5%。 Abstract: To study the working performance and mechanical properties of recycled concrete with 100% replacement rate of recycled aggregate, different steel content (0, 5%, 10%, 20%) and 1.2 kg/m3 polypropylene fiber were mixed into recycled concrete. The results show that the fluidity of polypropylene fiber recycled concrete can be effectively improved by adding steel particles, and there is a little influence on water retention property of concrete. The different content of steel particles causes the fluctuation of compressive strength of polypropylene fiber recycled concrete, and the splitting tensile strength of concrete is reduced to a certain extent with the increase of steel particles and the better steel particles content of polypropylene recycled concrete is 5%.

王兵,朱平华,许飞,等.钢粒对聚丙烯纤维再生混凝土性能的影响[J].混凝土与水泥制品,2019(4):97-100. WANG B,ZHU P H,XU F,et al.The Influence of Steel Particles on Properties of Polypropylene Fiber Recycled Concrete[J].China Concrete and Cement Products,2019(4):97-100.

摘 要：通过对某地下车库混凝土框架柱的施工质量缺陷进行分析，得到施工质量缺陷产生的原因、危害、影响范围等。根据缺陷情况制定了相应的加固处理方案，指出了混凝土框架结构浇筑施工时应注意的关键点。 Abstract: By analyzing the construction quality defects of concrete frame columns in an underground garage, the causes, harm and influence range of the construction quality defects are obtained. The corresponding reinforcement schemes are worked out according to the defects and the key points that should be paid attention to in pouring construction of concrete frame structure are emphasized.

史永恒.某地下车库混凝土框架柱施工质量事故分析[J].混凝土与水泥制品,2019(4):92-96. SHI Y H.Analysis on Construction Quality Accidents of Concrete Frame Columns in an Underground Garage[J].China Concrete and Cement Products,2019(4):92-96.

摘 要：以重庆市寨子坪大桥为工程背景，研究了管冷的布置线形、布置间距、入水方向以及入水温度对承台水化热分析的影响。通过研究冷水管的三种布置形状和两种入水方式，同时改变冷水管布置间距、入水水温等参数，得到了冷水管布置形状和入水方式对承台水化热分析的影响规律，并对冷水管布置间距和入水水温提出了建议取值。 Abstract: Taking the Zhaiziping Bridge in Chongqing as the engineering background, the effects of tube cooling layout line, arrangement spacing, inlet water direction and inlet water temperature on the hydration heat analysis of the cap are studied. By studying the three layout shapes of the cold water pipe and the two water inlet modes, and changing the parameters such as the interval of the cold water pipe and the water temperature of the water inlet, the law of influence of the layout line of the cold water pipe and the water inlet mode on the hydration heat analysis of the cap is obtained. Suggested values are proposed for the spacing of the cold water pipes and the temperature of the incoming water.

唐杨,曹海洋,谭红梅,等.冷水管布置线形及设置参数对承台水化热分析的影响[J].混凝土与水泥制品,2019(4):86-91. TANG Y,CAO H Y,TAN H M,et al.Effects of Layout Line of Cold Water Pipes and Setting Parameters on Hydration Heat of the Caps[J].China Concrete and Cement Products,2019(4):86-91.

摘 要：结合短切玻璃纤维的特征，对EN 14649:2005（E）《预制混凝土制品-水泥和混凝土中玻璃纤维残留强力的测试方法（SIC TEST）》（欧标）中长玻璃纤维耐碱性能测试方法进行了改进，研发出了一种适用于短切玻璃纤维耐碱性能的测试方法。采用欧标法及改进欧标法对同一品种的玻璃纤维进行试验，同时进行了平行试验以验证改进欧标法的可靠性。结果表明，对于短切玻璃纤维而言，改进欧标法相较于欧标法具有更好的适用性；两种方法的试验结果具有一致性，说明了改进欧标法具有较强的实用性和可操作性。 Abstract：According to the characteristics of chopped glass fibers, the testing method of alkali resistance of long glass fibers in EN 14649:2005 (E) Precast concrete products-Test method for strength retention of glass fibers in cement and concrete (SIC test) was improved. The glass fibers of the same variety were tested and compared using the Eurocode method and the improved Eurocode method, then the relevant parallel experiments were carried out to verify the reliability of the improved European standard method. The results show that , the improved Eurocode method has better applicability than the Eurocode method for testing alkali resistance of the chopped glass fibers. The experimental results of the two methods are consistent, which indicates that the improved Eurocode method has strong practicability and operability.

葛晨,王金辉,谈永泉,等.短切玻璃纤维耐碱性能评价方法研究[J].混凝土与水泥制品,2019(4):82-85. GE C,WANG J H,TAN Y Q,et al.Evaluation Method Study on Alkali Resistance Performance of Chopped Glass Fibers[J].China Concrete and Cement Products,2019(4):82-85.

摘 要：介绍了DBJ 61/T 139—2017《陕西省城镇综合管廊施工与质量验收规程》的编制背景、编制目的、编制原则，详细阐述了规程的主要内容、编制重点以及关键技术要点，梳理统计了国内相关标准现状。 Abstract: The background, purpose and principle of the compilation of DBJ 61/T 139—2017 Specification for Construction and Quality Acceptance for Urban Utility Tunnel of Shaanxi Provinceis are systematically introduced, the main contents of the regulations， the emphasis of the compilation and the key technical points of DBJ 61/T 139—2017 are expounded in detail, and the domestic related standard situation is combed and counted.

崔国静,师莹莹,张磊,等.DBJ 61/T 139—2017《陕西省城镇综合管廊施工与质量验收规程》编制说明[J].混凝土与水泥制品,2019(4):78-81. CUI G J,SHI Y Y,ZHANG L,et al.Instruction to the Standard DBJ 61/T 139—2017 Specification for Construction and Quality Acceptance for Urban Utility Tunnel of Shanxi Province[J].China Concrete and Cement Products,2019(4):78-81.

摘 要：基于有限元分析建立了钢筋混凝土框架节点不同受火时间的温度场模型及火后的力学计算模型，采用热力耦合的方法，对节点进行低周反复加载，研究火后节点的抗震性能包括滞回曲线、骨架曲线的变化规律。结果表明，未受火和不同受火时间下，节点弹性阶段承载力几乎不变，而极限承载力在受火后将出现不同程度的降低，随着受火时间的增加，结构的承载力和刚度明显降低。 Abstract: The temperature field model of the reinforced concrete frame joints with different fire time and the mechanical calculation model after fire are established based on the finite element analysis. The joints are subjected to low cyclic loading. The post-fire seismic performance of the joints including the variation of the hysteresis curve and the skeleton curve are investigated by using the thermomechanical coupling method. The results show that the bearing capacity in the elastic phase is almost invariable under different fire time, and the ultimate bearing capacity will decrease in different degrees after the fire. The bearing capacity and stiffness of the structure are evidently reduced with the increase of fire time.

王锦燕,岳幸超.火后钢筋混凝土框架节点抗震性能有限元分析[J].混凝土与水泥制品,2019(4):74-77. WANG J Y,YUE X C.Finite Element Analysis on Seismic Performance of Post-fire Steel Reinforced Concrete Frame Joints[J].China Concrete and Cement Products,2019(4):74-77.