水泥混凝土制品_2022_《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

预制管片混凝土裂缝控制技术研究

温泉武

2022年第1期

摘要

引用本文

摘　要：为抑止混凝土收缩，配制出满足工作性、力学性能、耐久性要求，又经济合理的预制管片用混凝土，依据SL/T 352—2020《水工混凝土试验规程》，通过降低混凝土浆体总量等方法，试验研究了不同水胶比和粉煤灰掺量对管片用混凝土强度的影响。在配合比优选基础上，提出了管片生产浇筑和养护过程中的工艺控制措施，可为管片的生产提供参考。 Abstract: In order to inhibit concrete shrinkage, and prepare precast segment concrete that meets the requirements of workability, mechanical properties and durability, according to the SL/T 352—2020 Test Code for Hydraulic Concrete, the effects of different water binder ratio and fly ash content on concrete strength are studied by reducing the total amount of concrete slurry. On the basis of mix proportion optimization, the precautions in the process of segment production, pouring and maintenance are put forward, which can provide technical solutions for the production site.

温泉武.预制管片混凝土裂缝控制技术研究[J].混凝土与水泥制品,2022(1):44-47. WEN Q W.Research Crack Control Technology of Precast Segment Concrete[J].China Concrete and Cement Products,2022(1):44-47.

C105管桩混凝土设计参数取值的探讨

何友林，茹军辉，李龙

2022年第1期

摘要

引用本文

通过试验得出了C105混凝土100 mm×100 mm×100 mm立方体非标准试件抗压强度换算系数以及C105混凝土的标准方差和强度变异系数。采用理论计算，得到了棱柱体抗压强度与立方体抗压强度的比值αc1，并与试验实测平均值进行了比较，验证了理论计算方法的可行性。此外，通过对比分析，探讨了直接外延法和引用公式法两种C105混凝土设计参数计算方法的正确性，研究结果可为C105管桩混凝土的设计和应用提供参考。 Abstract: The conversion coefficient of C105 concrete compressive strength was obtained for the size of the 100 mm×100 mm×100 mm cubic specimen by testing. And the standard deviation and strength variable coefficient were obtained by statistical analysis. The ratio αc1 of prismatic compressive strength to cubic compressive strength was obtained by theoretical calculation, and compared with the measured average value, which verifies the feasibility of the theoretical calculation method. In addition, through the comparative analysis, the correctness of the direct epitaxy method and quoted formula method of C105 concrete design parameters was systematically discussed, and the research results can provide a reference for the design and application of C105 pile concrete.

何友林,茹军辉,李龙.C105管桩混凝土设计参数取值的探讨[J].混凝土与水泥制品,2022(1):41-43,47. HE Y L,RU J H,LI L.Discussion on Design Parameters Value Selection of C105 Piles Concrete[J].China Concrete and Cement Products,2022(1):41-43,47.

纤维种类对超高性能混凝土电杆性能的影响研究

骆静静1，田寅1，张立力1，陈晶晶1，王涛2，苏强2

2022年第1期

摘要

引用本文

摘要：为研究聚丙烯纤维（PP纤维）、耐碱玻璃纤维（BX纤维）、钢纤维（GX纤维）对超高性能混凝土（UHPC）电杆力学性能和耐久性能的影响，在前期掺量优选试验基础上，采用卧式离心工艺成型了规格为?覫190×12×M×BY的UHPC 电杆，并进行了力学性能和耐久性能试验。结果表明：不同纤维种类对UHPC 折压比的影响从高到底依次为：GX纤维、BX纤维、PP纤维；三种纤维均可提高UHPC 的耐久性，但效果不显著；三种纤维对UHPC 电杆力学性能的影响由高到低依次为：GX纤维、BX纤维、PP纤维；三种纤维UHPC 电杆均满足相关标准要求，考虑电杆外观和经济性，可使用PP纤维和BX纤维生产UHPC 电杆。 Abstract: In order to study the effects of polypropylene fiber, alkali resistant glass fiber and steel fiber on the mechanical properties and durability of ultra-high performance concrete poles, based on the preliminary content optimization test, the ?覫190×12×M×BY ultra-high performance concrete poles were produced by horizontal centrifugal process, and the mechanical properties and durability tests were carried out. The results show that the effects of different fiber types on the flexural compression ratio of ultra-high performance concrete from high to low are steel fiber, alkali resistant glass fiber and polypropylene fiber. Three kinds of fibers can improve the durability of ultra-high performance concrete, but the effect is not significant. The effects of three fibers on the mechanical properties of UHPC poles from high to low are steel fiber, alkali resistant glass fiber and polypropylene fiber. Three kinds of fibers all can meet the requirements of relevant standards. Considering the appearance and economy of poles, polypropylene fiber, alkali resistant glass fiber can be recommended to used to produce UHPC poles.

骆静静,田寅,张立力,等.纤维种类对超高性能混凝土电杆性能的影响研究[J].混凝土与水泥制品,2022(1):38-40. LUO J J,TIAN Y,ZHANG L L,et al.Study on the Influence of Fiber Types on the Performance of Ultra-high Performance Concrete Poles[J].China Concrete and Cement Products,2022(1):38-40.

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