水泥混凝土制品_2020_《混凝土与水泥制品》杂志社

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发布时间：2020-01-06 00:00:00

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水泥混凝土制品

矿物掺合料对PVA-ECC性能的影响

周旭，李晓琴，丁捷，黄可

2020年第9期

摘要

引用本文

摘要：研究了单掺粉煤灰和复掺粉煤灰与硅灰代替部分水泥对PVA-ECC试件力学性能、裂缝宽度及抗渗性能的影响。结果表明，单掺粉煤灰会导致PVA-ECC试件强度下降，但可显著增加其韧性。复掺粉煤灰与硅灰时，PVA-ECC试件表现出优异的应变硬化特性以及多缝开裂现象，力学性能得到提升，基体均匀性增加，抗渗性能得到改善，最大提升了约33%。试验得到了具有良好性能的粉煤灰-硅灰-水泥三元体系PVA-ECC试件，其极限拉伸应变达到2.07%，抗压强度达到42.6 MPa，裂缝宽度较小且分布均匀，渗透系数仅为2.136×10-11 m/s，抗渗性能较优。 Abstract: The effects of single-doped fly ash and mixed fly ash and silica fume instead of part of cement on the mechanical properties, crack width and impermeability of PVA-ECC specimen were studied. The results show that the single-doped fly ash can reduce the strength of PVA-ECC specimen, but significantly increase its toughness. When mixed with fly ash and silica fume, PVA-ECC specimen shows excellent strain hardening characteristics and multi-slit cracking, the mechanical properties are improved, the matrix uniformity is increased, and the impermeability is improved with a maximum increase of about 33%. The good performance of fly ash-silica fume-cement ternary system PVA-ECC specimen is obtained, and its ultimate tensile strain is 2.07%, compressive strength is 42.6 MPa, crack width is small and uniformly distributed, permeability coefficient is only 2.136 × 10-11 m/s, and its impermeability is good.

周旭,李晓琴,丁捷,等.矿物掺合料对PVA-ECC性能的影响[J].混凝土与水泥制品,2020(9):43-46. ZHOU X,LI X Q,DING J,et al.The Effect of Mineral Admixture on the Performance of PVA-ECC[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(9):43-46.

预制混凝土板桩式结构在公路改扩建中的应用

朱俊1，胡可2，吴平平1，于春江2

2020年第9期

摘要

引用本文

摘要：为解决高速公路改扩建工程在局部路段面临的取土、征地困难等问题，研发了一种预制混凝土桩板式结构。该结构以预制混凝土管桩直接支撑预制钢筋混凝土梁板为承载结构，分析了该结构的特征和优势，阐述了该结构的构造细节和设计方法，并介绍了该结构在改扩建工程中的应用。 Abstract: In order to solve the difficult problems of collecting land and land requisition faced in the highway reconstruction and expansion project, a new type of highway pile-slab structure was developed. The structure is a simple and permeable load-bearing structure formed by precast piles directly supporting precast reinforced concrete slabs. The typical characteristics and advantages of the structural system are analyzed, the structural details and design methods of the structure are expound and the application of the structure in the reconstruction and expansion project is introduced.

朱俊,胡可,吴平平,等.预制混凝土板桩式结构在公路改扩建中的应用[J].混凝土与水泥制品,2020(9):40-42,51. ZHU J,HU K,WU P P,et al.Application of Precast Pile-slab Structure in Highway Reconstruction and Expansion Project[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(9):40-42,51.

城市地下综合管廊力学性能研究现状综述

林桂武1，常志凯1，林志南1，王家全1，钟张宝2，胡锋2

2020年第9期

摘要

引用本文

摘要：归纳总结了大量城市地下综合管廊运营过程中遇到的问题，指出地下综合管廊建设和运营过程中遇到的最主要问题为动荷载以及穿越非均匀地基，叙述了地下综合管廊的研究发展趋势及其在动荷载和非均匀地基下的力学性能的研究现状，提出了现有主要成果研究的不足，并对未来研究进行了展望。 Abstract: The problems encountered in the operation of urban underground utility tunnel are summarized, the dynamic load and crossing non-uniform foundation as the most important problems encountered in the construction and operation of underground utility tunnel are concluded. The research development trend of underground utility tunnel and its mechanical properties under dynamic load and non-uniform foundation are reviewed, the main shortcomings of existing research are put forward，and the future research is prospected.

林桂武,常志凯,林志南,等.城市地下综合管廊力学性能研究现状综述[J].混凝土与水泥制品,2020(9):34-39. LIN G W,CHANG Z K,LIN Z N,et al.Research Status Review of Mechanical Properties of Urban Utility Tunnel[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(9):34-39.

机制砂在免蒸压管桩混凝土中的应用研究

王孟波，明维，张芳芳，余柯宁

2020年第9期

摘要

引用本文

摘要：通过使用机制砂替代天然砂进行免蒸压管桩混凝土配制试验，主要对比了不同品质机制砂取代天然砂对管桩混凝土拌和物工作性、力学性能、耐久性能以及桩身抗弯性能的影响，探讨了高品质机制砂在免蒸压管桩混凝土中应用的可行性。结果表明，采用高品质机制砂制备的混凝土拌和物具有较好的和易性，能够满足免蒸压管桩的生产工艺要求。同时，采用高品质机制砂生产的管桩桩身结构性能也满足相关标准要求。 Abstract: The effect of sand substitution rate of different quality manufactured sand instead of river sand on working performance, mechanical properties and durability of pile concrete as well as bending performance of piles was studied. And the feasibility of high performance mechanical sand in autoclaved pile concrete was also discussed. The test result show that the performance of non-autoclaved pile can meet therequirements of local and national standards, which maded of the high performance mechanism sand, whose concrete performance can meet the non-autoclaved process requirements.

王孟波,明维,张芳芳,等.机制砂在免蒸压管桩混凝土中的应用研究[J].混凝土与水泥制品,2020(9):30-33,39. WANG M B,MING W,ZHANG F F,et al.Application Research of Manufactured Sand in Non-autoclaved Pile Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(9):30-33,39.

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