摘   要：基于工程实际要求，对内衬高密度聚乙烯（HDPE）片材化学物理性能及内衬HDPE片材钢筋混凝土管节进行了试验研究，包括内衬HDPE单键和多键的抗拉拔试验、管节接头抗内水压和外水压试验、HDPE片材覆贴接头抗外水压试验、外压荷载试验， 可为HDPE片材在钢筋混凝土排水管中的应用和推广提供参考。 Abstract: Based on the actual requirements of project,  the chemical and physical properties tests of HDPE sheets and pipe section tests of large diameter HDPE lining reinforced concrete sewer pipes are carried out, including single and multiple bond pull-out tests of HDPE lining, internal and external water pressure tests of pipe joints, external water pressure test of concrete sewer pipe joint with HDPE sheet, interface and external pressure load tests, which can provide a reference for the application and promotion of HDPE sheet in the corrosion resistance of reinforced concrete sewer pipe.

吕根喜,高武,毛海明,等.内衬HDPE片材大口径钢筋混凝土排水管检测试验初探[J].混凝土与水泥制品,2021(2):37-43. LYU G X,GAO W,MAO H M,et al.Tests of Large Diameter HDPE Lining Reinforced Concrete Sewer Pipes[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(2):37-43.

摘  要：基于ABAQUS有限元软件，模拟分析了PHC管桩抱箍式机械连接轴拉承载性能。结果表明：抱箍式机械连接的零部件均可满足PHC管桩桩身轴拉设计值要求；抱箍式机械连接轴拉力传力路线不直接，位移变形相对大；零部件应力分布相对不均匀，六角高强螺钉与U型抱箍卡之间存在先后屈服的现象。建议将U型抱箍卡上的六角高强螺钉孔设置为椭圆孔，预留一定的滑动空间，避免螺钉发生材料屈服现象。 Abstract: Based on ABAQUS, the axial tension bearing capacity of hoop type mechanical connection of PHC pile is analyzed by finite element method. The results show that the mechanical parts of hoop type connection joint can meet the bearing requirements of PHC piles axial tension design value; the tension transmission route of hoop type mechanical connection shaft is not direct, and the displacement deformation is relatively large; the stress distribution of parts is relatively uneven, and there is the phenomenon of yielding successively between hexagon high strength screw and U-shaped hoop clamp. It is suggested that the hexagon high-strength screw hole on the U-type hoop should be set as an ellipse hole, and a certain sliding space should be reserved to avoid the material yield phenomenon of the screw.

安增军,贺武斌,刘佳龙,等.PHC管桩抱箍式机械连接轴拉承载性能数值分析[J].混凝土与水泥制品,2021(2):44-48. AN Z J,HE W B,LIU J L,et al.Numerical Analysis of Axial Tension Bearing Capacity of Hoop Type Mechanical Connection of PHC Piles[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(2):44-48.

摘   要：大跨度先张法预应力混凝土双T板具有跨度大、结构性能好、成本低、整体性好等特点，被广泛应用于工业建筑。结合实际工程，介绍了大跨度双T板的生产工艺，并重点阐述了钢绞线张拉、预应力控制、混凝土浇筑和养护工艺，可为大跨度双T板的生产应用提供参考。 Abstract： Large-span pre-tensioned prestressed concrete double-T slabs have the advantages of large span, good structural performance, low cost, good integrity and are widely used in the industrial buildings. Combined with the practical engineering, the production technology of the double-T slab is introduced, and the steel strand tension, prestress control, concrete pouring and maintenance technology are described in detail, which can provide a reference for the production and application of long-span double-T slabs.

刘洋,高名扬,任端城,等.大跨度先张法预应力混凝土双T板的生产[J].混凝土与水泥制品,2021(2):49-50,60. LIU Y,GAO M Y,REN D C,et al.Manufacture of Large-span Pre-tensioned Prestressed Concrete Double-T Slabs[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(2):49-50,60.

摘   要：为了探究改善超高性能混凝土（UHPC）高温性能的措施，从力学性能、质量损失、超声检测等方面研究了纤维（不掺纤维、单掺钢纤维、混掺钢纤维与合成纤维）对UHPC高温性能的影响。结果表明：当纤维掺量增加时，UHPC的工作性与抗压强度均随之下降，抗折强度则先升后降；随着目标温度的升高，UHPC的残余抗压强度先升后降，损伤逐步加重；纤维的加入可以延缓裂缝的发展，混掺钢纤维与合成纤维可以有效改善UHPC高温爆裂行为。 Abstract: In order to explore the measures to improve the high temperature performance of ultra-high performance concrete(UHPC), the influence of fiber(non-fiber, single steel fiber, mixed steel fiber and synthetic fiber) on the high temperature performance of UHPC was studied from the aspects of mechanical properties, mass loss and ultrasonic testing. The results show that when the fiber content increases, the workability and compressive strength of UHPC decrease, while the flexural strength increases first and then decreases. With the increase of the target temperature, the residual compressive strength increases first and then decreases. The addition of fiber can delay the development of cracks, and the mixing of steel fiber and synthetic fiber can effectively improve the high temperature burst behavior of UHPC.

钱云峰,杨鼎宜,夏旸昊,等.纤维对含粗骨料超高性能混凝土高温性能的影响[J].混凝土与水泥制品,2021(2):51-56. QIAN Y F,YANG D Y,XIA Y H,et al.Influence of Fiber on High Temperature Performance of Ultra-high Performance Concrete With Coarse Aggregate[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(2):51-56.

摘   要：对掺加聚丙烯-玄武岩混杂纤维的陶粒混凝土进行了抗压强度、抗折强度、劈裂抗拉强度试验，得到了混杂纤维对陶粒混凝土力学性能的影响规律。结果表明：混杂纤维掺量为0.2%时，陶粒混凝土的抗压强度、劈裂抗拉强度、抗折强度提升幅度最大，分别较基准组提高了11.21%、30.73%、15.26%，但掺量过大时陶粒混凝土的力学性能会下降，甚至出现负效应；聚丙烯纤维与玄武岩纤维的混杂比为2∶1时，其对陶粒混凝土的增强效果较好；混杂纤维能增强陶粒混凝土的韧性，对抗折强度和抗拉强度提升效果明显，对抗压强度提升效果较小。 Abstract: The compressive strength, flexural strength and splitting tensile strength tests of ceramsite concrete with polypropylene-basalt hybrid fiber were carried out, and the influence rules of hybrid fiber on the mechanical properties of ceramsite concrete were obtained. The results show that when the hybrid fiber content is 0.2%, the compressive strength, splitting tensile strength and flexural strength of ceramsite concrete have the largest increase, which are increased by 11.21%, 30.73% and 15.26% respectively compared with blank group, but when the hybrid fiber content is too high, the mechanical properties of ceramsite concrete will be decreased or even have negative effect. When the mixing ratio of polypropylene fiber and basalt fiber is 2∶1, the reinforcement effect of ceramsite concrete is great. The toughness of ceramsite concrete can be enhanced by adding hybrid fiber, and the tensile strength and flexural strength are obviously improved, but the effect of improving compressive strength is small.

朱红兵,施旭刚,李秀.聚丙烯-玄武岩混杂纤维对陶粒混凝土力学性能的影响[J].混凝土与水泥制品,2021(2):57-60. ZHU H B,SHI X G,LI X.Influence of Polypropylene-basalt Hybrid Fiber on Mechanical Properties of Ceramsite Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(2)::57-60.

摘   要：采用振动搅拌技术，选取碳纤维为导电相制备用于杆塔基础接地的导电混凝土，并对碳纤维导电混凝土的振动搅拌工艺参数、配合比和接地性能进行了试验研究。结果表明：采用振动搅拌技术制备碳纤维导电混凝土的最优工艺参数组合为：干拌时间10 s、湿拌时间70 s、加碳纤维搅拌时间60 s；最优配合比为：碳纤维掺量0.3%、水灰比0.46、单位用水量200 kg、砂率36%；此工艺参数和配合比下，导电混凝土的28 d抗压强度为46.3 MPa，抗折强度为5.7 MPa，28 d电阻率为2.09 Ω·m，导电性能优良，满足输电线路杆塔基础接地的性能要求。 Abstract: Based on the vibration mixing technology, carbon fiber was selected as the conductive phase to prepare the conductive concrete for tower foundation grounding. The vibration mixing process parameters, mix proportion and grounding performance of carbon fiber conductive concrete were studied. The results show that the best combination of process parameters for the preparation of carbon fiber conductive concrete are: dry mixing time of 10 s, wet mixing time of 70 s and carbon fiber mixing time of 60 s. The best mix proportion is: carbon fiber content of 0.3%, water cement ratio of 0.46, unit water ues of 200 kg, sand ratio of 36%. Under this process parameter and mix proportion, the 28 d compressive strength and bending strength of the conductive concrete are 46.3 MPa and 5.7 MPa respectively, and the 28 d resistivity of the conductive concrete is 2.09 Ω·m, which has excellent electrical conductivity and meets the requirements of the grounding performance of the transmission line tower foundation. 

程育林,周迁,刘宇彬,等.基于振动搅拌技术的碳纤维接地导电混凝土制备及性能研究[J].混凝土与水泥制品,2021(2):61-64,100. CHENG Y L,ZHOU Q,LIU Y B,et al.Study on Preparation and Performance of Carbon Fiber Grounded Conductive Concrete Based on Vibration Mixing Technology[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(2):61-64,100.