混凝土研究_2024_《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

基于复合胶凝材料体系的超高性能混凝土性能研究

李响1，王佳男1，胡江海1，付文翔1，徐方2，*

2024年第2期

摘要

引用本文

摘要：针对桥梁伸缩缝过渡区频繁出现的混凝土破损问题，研发了一种用于桥梁伸缩缝过渡区修复的硅酸盐-硫铝酸盐复合水泥胶凝材料体系超高性能混凝土（UHPC），并对其性能及微观结构进行了研究；优选了硫铝酸盐水泥的掺入比例，在某公路伸缩缝修复工程中进行了实际应用。结果表明：合适掺量的硫铝酸盐水泥能够有效提高UHPC的综合性能；当硫铝酸盐水泥质量为水泥总质量的10%时，所制备的UHPC在实际修复工程中的应用效果较好，养护24 h后抗压强度已经达到40 MPa。 Abstract: In response to the frequent occurrence of concrete damage in the transition zone of bridge expansion joints, a ultra-high performance concrete(UHPC) based on silicate sulfoaluminate composite cement cementitious material system was developed for the repair of bridge expansion joint transition zone, and its performance and microstructure were studied. The mix proportion of sulfoaluminate cement was optimized, which was actually applied in a highway expansion joint repair project. The results show that a suitable amount of sulfoaluminate cement can effectively improve the comprehensive performance of UHPC. When the mass of sulfoaluminate cement is 10% of the total cement mass, the prepared UHPC has a good application effect in practical repair project, and the compressive strength has reached 40 MPa after 24 h curing.

李响,王佳男,胡江海,等.基于复合胶凝材料体系的超高性能混凝土性能研究[J].混凝土与水泥制品,2024(2):1-5. LI X,WANG J N,HU J H,et al.Research on performance of ultra-high performance concrete based on composite cementitious material system[J].China Concrete and Cement Products,2024(2):1-5.

基于正交试验的矿物掺合料透水混凝土性能研究

丁伟正，朱洪威*，程军旺

2024年第2期

摘要

引用本文

摘要：在透水混凝土中掺入硅灰和矿粉，设计了四因素四水平正交试验，采用极差法分析了目标孔隙率、水胶比、硅灰掺量、矿粉掺量对透水混凝土抗压强度和透水性能的影响，并对其微观形貌进行了分析。结果表明：各因素对透水混凝土抗压强度和透水性能影响的大小顺序为目标孔隙率＞水胶比＞硅灰掺量＞矿粉掺量；透水混凝土的抗压强度和透水系数之间呈负相关关系；微观分析发现，未掺硅灰、矿粉的透水混凝土微观结构存在明显孔洞，硅灰或矿粉的掺入可以对孔洞进行有效填充，在一定程度上减少了孔隙数量，可改善透水混凝土的综合性能。 Abstract: A four factor and four level orthogonal test was designed by adding silica fume and mineral powder to pervious concrete. The range analysis method was used to analyze the effects of target porosity, water cement ratio, silica fume content, and mineral powder content on the compressive strength and permeability of pervious concrete, and the microstructure was analyzed. The results show that the order of influence of various factors on the compressive strength and permeability of pervious concrete is target porosity>water cement ratio>silica fume content>mineral powder content. There is a negative correlation between the compressive strength and permeability coefficient of the pervious concrete. Microscopic analysis shows that there are obvious pores in the microstructure of pervious concrete without silica fume or mineral powder. The addition of silica fume or mineral powder can effectively fill the pores, reduce the number of pores to a certain extent and improve the comprehensive performance of pervious concrete.

基于灰色关联度的超细水泥灌浆料的制备与性能研究

李彦江1，2，冯月娥1，2，*

2024年第2期

摘要

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摘要：采用超细水泥、抗裂防水剂、膨胀剂、减水剂等制备了大流动度高强超细水泥灌浆料，基于灰色关联度研究了各因素对灌浆料性能的影响，确定了灌浆料的最优配合比，并进行了微观结构分析。结果表明：采用最优配合比制备的灌浆料具有良好的工作性和力学性能，初始稠度为17.38 s，28 d抗压、抗折强度为95.7 MPa、15.9 MPa；56 d内灌浆料均表现为微膨胀；灌浆料的微观结构相对致密。 Abstract: A high fluidity, high strength, and ultra fine cement grouting material was prepared by using ultrafine cement, crack resistant and waterproof agents, expansion agents, and water reducing agents. The influence of various factors on the performance of the grouting material was studied based on grey relational analysis, and the optimal mix proportion of the grouting material was determined, and microstructure analysis was conducted. The results show that the grouting material prepared with the optimal mix proportion has good workability and mechanical properties, with an initial consistency of 17.38 s and 28 d compressive and flexural strength of 95.7 MPa and 15.9 MPa. The grouting material shows slight expansion within 56 d. The microstructure of the grouting material is relatively dense.

李彦江,冯月娥.基于灰色关联度的超细水泥灌浆料的制备与性能研究[J].混凝土与水泥制品,2024(2):11-14. LI Y J,FENG Y E.Preparation and performance study of ultrafine cement grouting materials based on grey relational analysis[J].China Concrete and Cement Products,2024(2):11-14.

巴基斯坦废弃粉细砂抹灰砂浆的耐久性能研究

吴筱文1，乌呢日1，申和庆2，3，*，叶武平2，3，王小燕2，3，夏京亮2，3

2024年第2期

摘要

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摘要：为了解决巴基斯坦废弃粉细砂抹灰砂浆易开裂、空鼓、脱落等问题，研究了纤维掺量（0、0.3、0.6、0.9、1.2、1.5 kg/m3）和膨胀剂掺量（0、4%、8%、12%、16%）对砂浆干燥收缩和弹性模量的影响。结果表明：随着纤维掺量的增加，砂浆的干燥收缩先降低后增加，弹性模量先增加后降低，纤维的最佳掺量为0.9 kg/m3；随着膨胀剂掺量的增加，砂浆的干燥收缩和弹性模量均降低；掺入适量的纤维和膨胀剂可以提高砂浆的耐久性能。 Abstract: To solve the problems of cracking, hollowing, and detachment of plastering mortar with waste fine sand from Pakistani, the effects of fiber contents(0, 0.3, 0.6, 0.9, 1.2, 1.5 kg/m3) and expansion agent contents(0、4%、8%、12%、16%) on the drying shrinkage and elastic modulus of mortar were studied. The results show that with the increase of fiber content, the drying shrinkage of mortar first decreases and then increases, and the elastic modulus first increases and then decreases. The optimal fiber content is 0.9 kg/m3. With the increase of expansion agent content, the drying shrinkage and elastic modulus of mortar decrease. Adding an appropriate content of fiber and expansion agent can improve the durability of mortar.

吴筱文,乌呢日,申和庆,等.巴基斯坦废弃粉细砂抹灰砂浆的耐久性能研究[J].混凝土与水泥制品,2024(2):15-17. WU X W,WU N R,SHEN H Q,et al.Study on the durability of plastering mortar with waste fine sand from Pakistani[J].China Concrete and Cement Products,2024(2):15-17.

高温作用后混凝土的动态轴拉力学性能研究

蒋奇勇，陈平

2024年第2期

摘要

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摘要：进行了高温作用后混凝土的单调拉伸和往复拉伸试验，分析了其主要力学特征参数（抗拉强度、初始弹性模量、峰值应变、残余应变、割线模量等）的温度效应和应变率效应。采用混凝土损伤模型，引入温度参数，提出了基于应变率效应和温度效应的混凝土加卸载模型，验证了模型的适用性。结果表明：混凝土的抗拉强度及初始弹性模量随着温度的升高而降低，峰值应变随着温度的升高而增大，残余应变累积与温度无关，而随应变率的增大而累积速率加快；混凝土卸载曲线的非线性程度与应变率呈正相关，与温度无明显关系；混凝土再加载曲线的非线性程度与温度呈正相关，与应变率无明显关系；通过对比得出，所提出的模型计算结果与实测结果吻合程度较好。 Abstract: The monotonic and reciprocating tensile tests of concrete after high temperature were carried out, and the temperature and strain rate effects of the main mechanical characteristic parameters of concrete (including tensile strength, initial elastic modulus, peak strain, residual strain, secant modulus, etc.) were analyzed. A concrete loading and unloading model based on strain rate effect and temperature effect was proposed by using the existing concrete damage model, and the applicability of the model was verified. The results show that the tensile strength and initial elastic modulus of concrete decrease with the increase of temperature. The peak strain increases with the increase of temperature, the accumulation of residual strain is independent of temperature, and the accumulation rate increases with the increase of strain rate. The nonlinearity of concrete unloading curve is positively related to strain rate, but has no obvious relationship with temperature. The nonlinearity of the concrete reloading curve is positively correlated with temperature, but has no obvious relationship with strain rate. By comparing the calculated results of the model with the measured results, the proposed model is in good agreement with the measured results.

蒋奇勇,陈平.高温作用后混凝土的动态轴拉力学性能研究[J].混凝土与水泥制品,2024(2):18-23,27. JIANG Q Y,CHEN P.Study on dynamic axial tensile properties of concrete subjected to high temperature[J].China Concrete and Cement Products,2024(2):18-23,27.

葡萄糖酸钠对水泥浆体流动度的影响及作用机理

栗翔，毛永琳，张建纲，周栋梁，杨勇

2024年第2期

摘要

引用本文

摘要：研究了葡萄糖酸钠对掺减水剂水泥浆体流动度的影响，并通过测试减水剂在水泥颗粒表面的吸附率、水化产物含量、固体颗粒的比表面积，分析了葡萄糖酸钠对流动度的影响机理。结果表明：葡萄糖酸钠的掺入提高了水泥浆体的流动度，降低了减水剂的吸附率，抑制了水泥浆体中早期钙矾石生成，但加速了中期钙矾石的生成速率，使钙矾石总量提高；葡萄糖酸钠降低了水泥浆体早期的比表面积，但后期比表面积明显增加。 Abstract: The effect of sodium gluconate on the fluidity of cement slurry with polycarboxylate superplasticizer was studied, and the mechanism of its influence on fluidity was analyzed by testing the adsorption rate of polycarboxylate superplasticizer on the surface of cement particles, the content of hydration products, and the specific surface area of solid particles. The results show that the addition of sodium gluconate improves the fluidity of cement slurry, reduces the adsorption rate of polycarboxylate superplasticizer, inhibites the formation of ettringite in cement slurry in the early age, but accelerates the formation rate of ettringite in the midium age, resulting in an increase in the total amount of ettringite. Sodium gluconate reduces the specific surface area of cement slurry at early age, but the specific surface area significantly increases in the later age.

栗翔,毛永琳,张建纲,等.葡萄糖酸钠对水泥浆体流动度的影响及作用机理[J].混凝土与水泥制品,2024(2):24-27. LI X,MAO Y L,ZHANG J G,et al.Influence and mechanism of sodium gluconate on the fluidity of cement slurry[J].China Concrete and Cement Products,2024(2):24-27.

硫酸盐环境下水泥砂浆的腐蚀产物及孔结构研究

王学兵1，郭声波1，潘志华2

2024年第2期

摘要

引用本文

摘要：采用激光拉曼光谱和压汞法研究了硫酸盐环境下水泥砂浆的腐蚀产物及孔结构，并引入分形维数，建立了水泥砂浆的抗折强度与平均孔径和分形维数的关系。结果表明：不同浓度的Na2SO4溶液浸泡下，砂浆表层腐蚀产物有所不同，且腐蚀产物在砂浆表层分布是不均匀的；砂浆的抗折强度与平均孔径r成反比，与分形维数d成正比，通过三种公式拟合可知，d/r2和抗折强度具有较好的相关性。 Abstract: The corrosion products and pore structure of cement mortar under sulfate corrosion were studied by using laser Raman spectroscopy and mercury intrusion method. Fractal dimension was introduced, and the relationship between the flexural strength of cement mortar and the average pore size and fractal dimension was established. The results show that the corrosion products on the surface of mortar are different when soaked in Na2SO4 solutions with different concentrations, and the distribution of corrosion products on the surface of mortar is uneven. The flexural strength of mortar is inversely proportional to the average pore size r and directly proportional to the fractal dimension d. By fitting three formulas, d/r2 and flexural strength has a good correlation.

王学兵,郭声波,潘志华.硫酸盐环境下水泥砂浆的腐蚀产物及孔结构研究[J].混凝土与水泥制品,2024(2):28-30,40. WANG X B,GUO S B,PAN Z H.Research on corrosion products and pore structure of cement mortar under sulfate environment[J].China Concrete and Cement Products,2024(2):28-30,40.

聚合物乳液改性水泥基材料阻尼性能研究进展

崔天霞1，费腾2，高越青3，梁超锋3，傅洋燕3，*

2024年第2期

摘要

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摘要：总结了不同聚合物乳液改性方式对水泥基材料阻尼性能的增强效果，分析了聚合物乳液增强阻尼性能的机理，并提出了聚合物乳液改性水泥基材料阻尼性能存在的问题与研究方向。 Abstract: The damping enhancement effects of different polymer emulsion modified cement-based materials are summarized, and the related mechanisms of polymer emulsion modification to improve the damping properties of cement-based materials are analyzed. The problems and research directions of the damping properties of polymer emulsion modified cement-based materials are proposed.

崔天霞,费腾,高越青,等.聚合物乳液改性水泥基材料阻尼性能研究进展[J].混凝土与水泥制品,2024(2):31-35. CUI T X,FEI T,GAO Y Q,et al.Research progress on damping properties of cement-based materials modified by polymer emulsion[J].China Concrete and Cement Products,2024(2):31-35.

约束作用下箍筋锈蚀对再生混凝土抗压强度的影响研究

韦炫辰1，秦荷成2，*，叶水斌3，谢静4

2024年第2期

摘要

引用本文

摘要：通过加速锈蚀箍筋约束再生混凝土试件的单轴受压试验，研究了配箍形式、箍筋锈蚀率等因素对抗压强度和破坏形态的影响。并结合再生混凝土的极限强度面和破坏准则，建立了锈蚀箍筋约束再生混凝土的抗压强度模型，验证了模型的有效性。结果表明：随着箍筋锈蚀率的增加，试件的抗压强度减小；当配箍形式相同时，箍筋间距越大，箍筋锈蚀率对抗压强度的影响越显著；当箍筋间距相同时，箍筋锈蚀率对配置方形箍试件的抗压强度影响程度比配置棱形箍试件的影响大；在锈蚀箍筋试件的轴压破坏位置处，箍筋是否发生断裂与配箍形式和箍筋锈蚀率有关；所建立的锈蚀箍筋约束再生混凝土的抗压强度模型考虑了配箍形式、箍筋间距、箍筋锈蚀率等重要因素的影响，适用于各种截面，经试验验证，具有良好的计算精度和适用性。 Abstract: By accelerating the uniaxial compression test of recycled concrete specimens under the constraint of corroded hoops, the influence of factors such as hoop form and hoop corrosion rate on compressive strength and failure mode was studied. Based on the ultimate strength surface and failure criteria of recycled concrete, a compressive strength model of recycled concrete with corroded hoops was established, and the effectiveness of the model was verified. The results show that as the hoop corrosion rate increases, the compressive strength of the specimen decreases. When the form of hoop is the same, the larger the spacing between hoops, the more significant the effect of hoop corrosion rate on compressive strength. When the spacing between hoops is the same, the hoop corrosion rate has a greater impact on the compressive strength of specimens with square hoops than those with prismatic hoops. At the axial compression failure location of specimens constrained by corroded hoops, whether the hoop fractures is related to the form of hoop and the hoop corrosion rate. The established compressive strength model for recycled concrete constrained by corroded hoop takes into account important factors such as hoop form, hoop spacing, and hoop corrosion rate. It is suitable for various cross-sections and was verified by experiments to have good calculation accuracy and applicability.

韦炫辰,秦荷成,叶水斌,等.约束作用下箍筋锈蚀对再生混凝土抗压强度的影响研究[J].混凝土与水泥制品,2024(2):36-40. WEI X C,QIN H C,YE S B,et al.Research on the influence of hoop corrosion under constraint on the compressive strength of recycled concrete[J].China Concrete and Cement Products,2024(2):36-40.

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