混凝土研究_2021_《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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混凝土研究

挤出型3D打印混凝土力学性能研究进展

黎宝山，姚一鸣，鲁聪

2021年第3期

摘要

引用本文

摘要：介绍了3D打印混凝土的特点与前景，综述了挤出型工艺的3D打印混凝土的压、拉、折、剪基本力学性能以及增强措施。研究表明：打印层在喷嘴的挤压作用下密实度有所提高，但同时层间易形成薄弱界面，造成性能的各向异性，通过调整胶凝材料、掺入纤维、优化工艺、水浴养护、布筋等措施能有效改善。此外，提出了还需进一步研究的问题。 Abstract: The characteristics and developing trend of 3D printed concrete technique are introduced. The mechanical properties including compression, tension, bending, shear and reinforcement measures of the 3D printed concrete are reviewed. The researches show the compactness of 3D printing layer is improved under the extrusion effect of nozzle, but there are obvious weak interface between the layers, leading to a great anisotropy. However, it can be effectively improved by adjusting the material composition, optimizing the processing manner, adopting special cured methods and steel reinforcement. In addition, the problems required for further research are put forword.

黎宝山,姚一鸣,鲁聪.挤出型3D打印混凝土力学性能研究进展[J].混凝土与水泥制品,2021(3):1-6. LI B S, YAO Y M, LU C.Research Progress of Mechanical Properties for Extrusion-based 3D Printed Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(3):1-6.

g-C3N4光催化混凝土对NO降解性能研究

张瑜都1，孔文琼1，赵建昌2，张晴3

2020年第3期

摘要

引用本文

摘要：研究了不同制备工艺及掺量的石墨相氮化碳（g-C3N4）对混凝土的力学性能及对NO气体光催化降解性能的影响及变化规律。通过TEM、SEM、XRD分别对材料的物相及微观结构进行了表征，利用微机控制全自动压力试验机和氮氧化物分析仪分别研究了掺g-C3N4后混凝土的抗压强度及对NO的降解性能。结果表明，四种不同种类的g-C3N4掺入后混凝土都具有对NO的降解作用，其中，少层g-C3N4的降解率最高，且在紫外线等照射24 h后其仍能保持较高的降解率；g-C3N4掺量不超过0.8％时混凝土的抗压强度不会有太大影响，在此范围内尽可能提高g-C3N4的掺量来提高其对NO的降解作用。 Abstract: The effects of different preparation technology and amount of graphite phase carbon nitride (g-C3N4) on the mechanical properties of the concrete and photocatalytic degradation of NO gas were studied. The phase and microstructure of the materials were characterized by TEM, SEM and XRD. The compressive strength and NO degradation of the concrete with g-C3N4 were studied by means of a microcomputer controlled automatic pressure tester and a nitrogen oxide analyzer. The results show that four kinds of g-C3N4 added in concrete have obvious degradation effect on NO, among which the degradation rate of a few layers g-C3N4 is the highest, and it can still maintain a high degradation rate 24 h after UV irradiation. The compressive strength of concrete will not be greatly affected when the amount of g-C3N4 does not exceed 0.8%, and the adding g-C3N4 can be improved as much as possible in this range to improve the degradation of NO.

张瑜都,孔文琼,赵建昌,等.7 g-C3N4光催化混凝土对NO降解性能研究[J].混凝土与水泥制品,2021(3):7-10. ZHANG Y D,KONG W Q,ZHAO J C,et al.Photocatalytic Concrete Loaded with g-C3N4 and Its Degradation Performance of NO[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(3):7-10.

TBM压注式超高性能混凝土试验研究

高玉军1,2,3，李亚隆4，毛锦波4，王文荣1,2,3

2021年第3期

摘要

引用本文

摘要：针对天山胜利隧道TBM压注式超高性能混凝土（UHPC）的性能要求，基于紧密堆积理论，优化了混凝土中胶凝材料各组分的比例。通过掺入钢渣粉、纳米早强剂和塑性膨胀剂配制出了大流动度、超长保坍、超早强、低收缩的UHPC，并研究了胶凝材料体系紧密堆积孔隙率、钢纤维掺量、混凝土流动性三者之间的关系。结果表明：采用复合掺合料、钢渣粉优化胶凝体系、骨料体系可制备出工作性良好、各项性能指标均能满足要求的UHPC，初始流动度大于700 mm，4 h流动度经时损失小于5%，1 d拆模且抗压强度大于设计要求51.6 MPa，28 d干燥收缩仅为200×10-6。纳米早强剂的掺入不但保证了混凝土早期强度的增长，而且不影响混凝土流动性的长时间保持和后期强度的增长。 Abstract: According to the performance requirements of TBM pressure-pumping ultra high-performance concrete (UHPC) in Tianshan Shengli Tunnel, based on the compact packing theory, the proportion of each component of the cementitious material system in the concrete was optimized. The plastic expansion agent UHPC with high fluidity, ultra-long time slump retention, ultra-early strength and low shrinkage was prepared by adding steel slag powder, nano early strength agent. The relationship between the tightly packed porosity of the cementitious material system and the steel fiber content and concrete fluidity was researched. The results show that the use of compound admixtures, steel slag powder, aggregate system to optimize the cementing system materials can prepare UHPC with excellent working performance and all performance indexes can meet the requirements. The initial fluidity is greater than 700 mm and the 4 h fluidity loss is less than 5%, 1 d demolding and compressive strength is greater than the design requirements of 51.6 MPa, 28 d drying shrinkage is only 200×10-6. The incorporation of nano early strength agent not only guarantees the increase of the concrete’s ultra-early strength, but also has no effect on the concrete’s long-term retention of fluidity and the growth of its strength in the later period.

高玉军,李亚隆,毛锦波,等.TBM压注式超高性能混凝土试验研究[J].混凝土与水泥制品,2021(3):11-14,19. GAO Y J,LI Ya-long,MAO Jin-bo,et al.Experimental Research on TBM Pressure-pumping Ultra-high Performance Concrete (UHPC)[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(3):11-14,19.

基于损伤理论的硅藻土混凝土冻融损伤研究

王艺程，郑一峰，秦泳，于泽

2021年第3期

摘要

引用本文

摘要：通过快速冻融试验，对不同强度等级的掺硅藻土混凝土的抗冻性进行了分析。在损伤理论的基础上构建了多次冻融后混凝土劣化失效的数学模型，使用Matlab程序模拟了混凝土内部各单元点的损伤失效与时间的函数关系，并生成了混凝土的截面损伤概率图。在冻融循环时间相同的条件下对不同硅藻土掺量的混凝土进行了对比分析。结果表明：硅藻土的加入使混凝土的抗冻性能得到了提高；模型模拟的混凝土损伤过程符合冻融破坏的变化规律。 Abstract: Through the rapid freeze-thaw experiment, the frost resistance of diatomite mixed with concrete of different strength levels was systematically analyzed. Based on the damage theory, a mathematical model of concrete degradation and failure after multiple freeze-thaw cycles was constructed. The Matlab program was used to simulate the functional relationship between the damage failure and time of each unit point in the concrete material, and a cross-sectional damage probability map of concrete was generated. Under the condition of the same freeze-thaw cycle time, the concrete with different diatomite content was compared. The results show that the frost resistance of concrete is improved by adding diatomite. And using the damage model for performance analysis, the concrete damage process simulated by the model conforms to the change law of freeze-thaw damage.

王艺程,郑一峰,秦泳,等.基于损伤理论的硅藻土混凝土冻融损伤研究[J].混凝土与水泥制品,2021(3):15-19. WANG Y C,ZHENG Y F,QIN Y,et al.Study on Freeze-thaw Damage of Diatomite Concrete Based on the Damage Theory[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(3):15-19.

水下隧道工程清水混凝土外观砂斑的成因分析

姜骞，于诚

2021年第3期

摘要

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摘要：为了研究清水混凝土外观砂斑的形成原因，对某水下隧道工程敞开段侧墙清水混凝土进行了质量调研与试验分析。结果表明：砂斑主要与混凝土用水量增加有关；原材料中粉煤灰品质的波动增加了混凝土用水量；为了在相同减水剂掺量下满足混凝土拌合物的流动性要求，大幅增加用水量造成混凝土中自由水过多，析出带走混凝土表面的胶凝材料颗粒，由此导致砂斑缺陷；针对缺陷的成因，从原材料品质控制、拌合生产、浇筑施工和及时养护等角度，提出了提升清水混凝土外观质量的建议。 Abstract: Aiming at a better understanding of cause of sand spots formation on fair-faced concrete for side wall in open section of some underwater tunnel, concrete construction quality on-site and experimental research within-laboratory were conducted. The results show that the concrete defect is found to be related to overuse of mixing water. To fulfill the workability of fresh concrete with same dosage of water reducer, water demand of concrete mixtures is increased for quality variation of fly ash. The excessive quantities of mixing water in the system lead to too much free water in paste. Binder particles on the surface of concrete are flushed away, and the sand spots appear. In addition, considering the cause of the defect, concrete surface quality promotion advices, including control of raw materials quality, pouring construction, and immediately curing, are put forward.

姜骞,于诚.水下隧道工程清水混凝土外观砂斑的成因分析[J].混凝土与水泥制品,2021(3):20-23,27. JIANG Q,YU C.Causes Analysis for Sand Spots on Fair-faced Concrete for Side Wall in Underwater Tunnel[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(3):20-23,27.

寒区隧道混凝土衬砌结构耐久性研究综述

韩少渊

2021年第3期

摘要

引用本文

韩少渊.寒区隧道混凝土衬砌结构耐久性研究综述[J].混凝土与水泥制品,2021(3):24-27. HAN S Y.Review on Durability of Tunnel Concrete Lining Structure in Cold Region[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(3):24-27.

粉煤灰、矿粉对水泥浆体变形性能的影响

陈红星1，戴惠兰1，贾志强1，张守治2，刘建新2，徐文3

2021年第3期

摘要

引用本文

摘要：以高性能混凝土用胶凝材料为研究对象，研究了粉煤灰、矿粉在不同养护湿度和温度下对水泥浆体变形性能的影响规律。结果表明：饱水养护时，粉煤灰的掺入降低了水泥浆体的水养膨胀变形；养护温度升高、粉煤灰掺量增加，水泥浆体水养膨胀变形降低幅度增大，但不同水养温度下掺入矿粉对水泥浆体膨胀变形无明显影响；密封养护时，掺入粉煤灰可有效抑制水泥浆体的自收缩，但矿粉掺入会增大水泥浆体自收缩；干燥养护时，掺入粉煤灰对水泥浆体有一定的减缩作用，而矿粉的掺入会增大水泥浆体的干燥收缩。 Abstract: Taking the cement material for high performance concrete as the research object，the deformation of cement based materials containing fly ash and slag under different curing humidity and curing temperature was studied. Experimental results show that fly ash reduces expansion deformation of cement paste under saturated condition. When the curing temperature increases, the expansion deformation of the cement paste containing fly ash decreases. However, slag has no effect on the expansion deformation of cement paste whatever under different temperature. Fly ash can reduce the shrinkage of cement paste whatever under sealed condition or under dried condition, but the slag increases the self-shrinkage and drying shrinkage of the cement paste.

陈红星,戴惠兰,贾志强,等.粉煤灰、矿粉对水泥浆体变形性能的影响[J].混凝土与水泥制品,2021(3):28-31. CHEN H X,DAI H L,JIA Z Q,et al.Influence of Fly Ash and Slag on the Deformation Performance of Cement Paste[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(3):28-31.

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