混凝土研究_2023_《混凝土与水泥制品》杂志社

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混凝土研究

陶粒内养护超高性能混凝土（UHPC）的制备与性能研究

黄展魏1,2，王安辉1,2，张艳芳1,2，倪娇娇1,2，陈晓君1

2023年第10期

摘要

引用本文

摘要：针对超高性能混凝土（UHPC）因胶凝材料用量大、水胶比小导致的体积稳定性问题，采用0、5%、10%、15%、20%陶粒等体积取代细骨料，制备了一种陶粒内养护UHPC，研究了陶粒取代率对UHPC工作性、力学性能、体积稳定性的影响，并运用压汞法、XPS、SEM微观测试方法分析了陶粒对UHPC微观结构的影响。结果表明：陶粒在胶凝材料水化过程中因内部相对湿度差释放水分，促进了水化反应，提高了水化产物的数量，增加了结构的致密性，改善了UHPC的力学性能、体积稳定性和孔结构；但当陶粒超过一定掺量时，也会带来不利影响。 Abstract: Aiming at the volume stability problem of ultra-high performance concrete (UHPC) caused by large amount of cementitious materials and small water binder ratio, a ceramsite self-curing UHPC was prepared by using the volume method of 0, 5%, 10%, 15% and 20% ceramsite instead of fine aggregate. The influence of ceramsite on the workability, mechanical properties and volume stability of UHPC was studied. The microstructure of UHPC was analyzed by mercury injection method, XPS and SEM. The results show that the ceramsite releases water driven by the internal relative humidity difference in the hydration process of cementitious materials, which promotes the hydration reaction, improves the amout of hydration products, increases the compactness of structure, and improves the mechanical properties, volume stability and pore structure of UHPC. When the amount of ceramsite is high, it can bring adverse effects.

黄展魏,王安辉,张艳芳,等.陶粒内养护超高性能混凝土（UHPC）的制备与性能研究[J].混凝土与水泥制品,2023(10):1-5. HUANG Z W,WANG A H,ZHANG Y F,et al.Study on preparation and properties of ceramsite self-curing ultra-high performance concrete(UHPC) [J].China Concrete and Cement Products,2023(10):1-5.

船闸大体积混凝土抗裂性能提高试验研究

嵇旭红1，周泽聪2，*，潘利2，王育江2，王瑞2

2023年第10期

摘要

引用本文

摘要：为提升船闸大体积混凝土的抗裂性能，探究抗裂剂对混凝土综合性能的影响，研究了复掺矿物掺合料和抗裂剂条件下砂浆的水化放热、混凝土的工作性、力学性能及收缩变形，结合微观试验分析了抗裂剂对混凝土水化的影响，并进行了工程现场试验室应用。结果表明：抗裂剂能够推迟砂浆的水化放热速率峰值，降低砂浆的早期放热量和混凝土的早期强度，但对混凝土后期强度影响不大；抗裂剂能够有效补偿混凝土的收缩，在粉煤灰和矿粉双掺体系中掺入抗裂剂后，混凝土的28 d干燥收缩降低了38%；抗裂剂有效降低了水泥净浆28 d的孔隙率；该抗裂剂在工程现场试验室中应用效果良好。 Abstract: In order to improve the anti-cracking performance of mass concrete in ship locks and investigate the effect of anti-cracking agent on the comprehensive performance of concrete, the hydration heat release of mortar, workability, mechanical properties and shrinkage deformation of concrete under the conditions of compounding mineral admixture and anti-cracking agent were studied, and the effect of anti-cracking agent on the hydration of concrete was analyzed by combining the paste microscopic test, and the anti-cracking agent was applied in the engineering field laboratory. The results show that the anti-cracking agent can delay the peak rate of hydration heat release of mortar and reduce the early exothermic heat of mortar and early strength of concrete, but it has little effect on the later strength of concrete. The anti-cracking agent can effectively compensate for the shrinkage of concrete. In the fly ash and mineral powder double-mixing system, after mixing anti-cracking agent, the 28 d drying shrinkage of concrete is decreased by 38%. The anti-cracking agent can reduce the 28 d porosity of cement paste. The anti-cracking agent has been applied effectively in the engineering field laboratory.

嵇旭红,周泽聪,潘利,等.船闸大体积混凝土抗裂性能提高试验研究[J].混凝土与水泥制品,2023(10):6-10. JI X H,ZHOU Z C,PAN L,et la.Experimental study on the improvement of cracking resistance of mass concrete in ship locks[J].China Concrete and Cement Products,2023(10):6-10.

钙铝石（C12A7）对普通硅酸盐水泥浆体电阻率的影响

李杨1，2，彭子凌1，何真2

2023年第10期

摘要

引用本文

摘要：通过混凝土非接触式电阻率测量技术，研究了钙铝石（C12A7）掺量（0、2.5%、5.0%、7.5%）对普通硅酸盐水泥浆体电阻率及电阻率特性的影响，并计算了水泥浆体完全水化时的极限电阻率值。结果表明：C12A7能够促进离子沉淀和水化产物的生成，加快AFt向AFm的转变，使浆体较早进入硬化期和离子扩散阶段；当C12A7掺量不超过5.0%时，浆体的电阻率随C12A7掺量的增加而增大；当C12A7掺量从5.0%增加到7.5%时，浆体的电阻率反而减小。 Abstract: The effect of mayenite(C12A7) content(0, 2.5%, 5.0%, 7.5%)on the resistivity and resistivity characteristics of the ordinary Portland cement pastes was investigated by the meaning of non-contact resistivity measurement techniques for concrete, and the limiting resistivity values were calculated when the cement paste was fully hydrated. The results show that C12A7 can promote the generation of ionic precipitation and hydration products, and accelerate the transition from AFt to AFm, allowing the pastes to enter the hardening stage and ion diffusion stage earlier. When the dosage of C12A7 does not exceed 5.0%, the resistivity of the pastes increases with the increase of C12A7. When the dosage of C12A7 increases from 5.0% to 7.5%, the resistivity of the paste decreases instead.

李杨,彭子凌,何真.钙铝石（C12A7）对普通硅酸盐水泥浆体电阻率的影响[J].混凝土与水泥制品,2023(10):11-15. LI Y,PENG Z L,HE Z.Influence of mayenite(C12A7) on electrical resistivity of ordinary Portland cement pastes[J].China Concrete and Cement Products,2023(10):11-15.

水下不分散灌浆料的制备及性能研究

逄鲁峰1，黄凌苗1，*，贾广贺3，付鹏2

2023年第10期

摘要

引用本文

摘要：以普通硅酸盐水泥为主要胶凝材料制备了一种水下不分散灌浆料，选取硅酸盐水泥、硫铝酸盐水泥和无水石膏的三元胶凝体系，采用单因素试验法，研究了水料比、高分子絮凝剂掺量、聚羧酸减水剂粉末掺量这3个关键因素对水下不分散灌浆料流动度、抗分散性、抗压强度的影响，确定出了最佳掺量。结果表明：当水料比为0.14、高分子絮凝剂掺量为0.15%、聚羧酸减水剂粉末掺量为0.55%时，水下不分散灌浆料的初始流动度为258 mm，30 min流动度为256 mm；7 d、28 d水下抗压强度分别为35.76 MPa、53.09 MPa；水下抗分散性为Ⅰ，水下不分散灌浆料的水下抗分散性好，可用于C40混凝土修补加固。 Abstract: An anti-washout underwater grout material was prepared with ordinary Portland cement as the main cementitious material. The ternary cementitious system of Portland cement, sulphoaluminate cement, anhydrite was selected. The single factor test method was used to study the influence of the three key factors, namely, the water to material ratio, the content of polymer flocculant, and the content of polycarboxylate superplasticizer powder, on the fluidity, anti dispersibility, and compressive strength of anti-washout underwater grout material, and the optimal content was determined. The results show that when the water to material ratio is 0.14, the content of polymer flocculant is 0.15%, and the content of polycarboxylate superplasticizer powder is 0.55%, the initial flowability of the anti-washout underwater grout material is 258 mm, and the flowability is 256 mm after 30 min. The underwater compressive strength at 7 d and 28 d is 35.76 MPa and 53.09 MPa, respectively. The underwater anti dispersibility is I, and the anti-washout underwater grout material has good underwater anti dispersibility, which can be used for repairing and strengthening C40 concrete.

逄鲁峰,黄凌苗,贾广贺,等.水下不分散灌浆料的制备及性能研究[J].混凝土与水泥制品,2023(10):16-20. PANG L F,HUANG L M,JIA G H,et la.Preparation and performance study of anti-washout underwater grout material[J].China Concrete and Cement Products,2023(10):16-20.

刚构桥承台大体积混凝土水化热温度场模拟分析

贾毅1，2，李琪1，韦朝宽1，黄子秋1，刘勇弘 1

2023年第10期

摘要

引用本文

摘要：为研究不同因素（冷却水管直径、环境温度等）下大体积混凝土的水化放热反应，以地泗河特大桥工程为背景，建立了承台大体积混凝土模型，并对不同影响参数进行了模拟分析。结果表明：通过在大体积混凝土中设置冷却水管以减小其内部温度梯度；控制冷却水管直径0.02 m、冷却水的进水温度20 ℃、冷却水流速1.2 m3/h、冷却水管间距1.2 m纵向布置、环境温度为20 ℃时，可以有效降低大体积混凝土的水化放热。 Abstract: In order to study the hydration exothermic reaction of mass concrete under different factors(diameter of cooling water pipe, environmental temperature, etc), the mass concrete for cushion cap model was established and different influence parameters were simulated with the background of the Disi River Special Bridge Project. The results show that by setting cooling water pipes in mass concrete, the internal temperature gradient is reduced. When the diameter of the cooling water pipe is 0.02 m, the inlet temperature of the cooling water is 20 ℃, the flow rate of the cooling water is 1.2 m3/h, longitudinal arrangement of cooling water pipes with a spacing of 1.2 m, and the environmental temperature is 20 ℃, the hydration heat release of mass concrete can be effectively reduced.

贾毅,李琪,韦朝宽,等,刚构桥承台大体积混凝土水化热温度场模拟分析[J].混凝土与水泥制品,2023(10):21-26. JIA Y,LI Qi WEI C K,et al.Simulation analysis on hydration heat temperature field of mass concrete for rigid frame bridge cushion capl[J].China Concrete and Cement Products,2023(10):21-26.

寒旱-盐渍土环境下风积沙混凝土的制备及性能研究

吴俊臣1，褚菁晶1，何青虎2，牛恒茂1

2023年第10期

摘要

引用本文

摘要：针对沙漠腹地与近沙漠区农业工程、基础设施建设原材料短缺、服役环境差、混凝土耐久性能差等问题，采用西部寒旱-盐渍地区的风积沙为原材料制备了C25风积沙混凝土（ASC），得到了最优配合比，并基于微观分析研究了盐冻、干湿循环耦合作用下ASC的耐久性能。结果表明：随着风积沙掺量从0增加到100%，ASC的损伤速度越慢，其抗盐冻、干湿循环耦合作用的能力也越好；高掺量（≥60%）ASC试件抗盐冻、干湿循环耦合作用的性能良好；高掺量ASC在寒旱-盐渍土地区道路与水利工程中具有较好的适用性。 Abstract: Aiming at the shortage of raw materials for agricultural engineering and infrastructure construction in the desert hinterland and near-desert area, poor service environment and concrete durability and other problems, the sands from the cold-arid and saline areas in the west as the raw materials for the preparation of C25 aeolian sand concrete(ASC) was used, and the optimal mix proportion was obtained. The durability of ASC under the coupling effect of salt freezing and dry wet cycles was studied based on the microscopic analysis. The results show that as the content of aeolian sand increases from 0 to 100%, the damage rate of ASC slows down, and its ability to resist the coupling effects of salt freezing and dry wet cycles also improves. ASC specimens with high content(≥60%) have good performance to resist the coupling effects of salt freezing and dry wet cycles. ASC with high content has good applicability in road and hydraulic engineering in cold-arid and saline areas.

吴俊臣,褚菁晶,何青虎,等.寒旱-盐渍土环境下风积沙混凝土的制备及性能研究[J].混凝土与水泥制品,2023(10):27-31,36. WU J C,CHU J J,HE Q H,et al.Preparation and performance study of aeolian sand concrete in cold-arid and saline environment[J].China Concrete and Cement Products,2023(10):27-31,36.

含水率对不同强度等级混凝土力学性能的影响试验研究

宋致科1，张国辉2，*，顾艳霜2，李虎1，杨茂开1

2023年第10期

摘要

引用本文

摘要：通过调整不同浸泡时间（0、2、5、24、120 h）来研究C20、C30及C40混凝土的含水率，并研究了含水率对混凝土抗压强度、劈裂抗拉强度、应力-应变的影响规律。结果表明：随浸泡时间的延长，混凝土的含水率总体表现出前期快速增加，后期缓慢增加，120 h时基本达到饱和状态；混凝土的抗压强度与劈裂抗拉强度均随含水率的增加呈降低趋势，含水率的影响作用显著；在饱和状态下，混凝土的抗压强度、劈裂抗拉强度较干燥状态时的最大降幅分别达36.35%、32.36%；相对较低强度等级混凝土的力学性能对含水率的敏感性更强；随着含水率的增加，混凝土的单轴抗压及劈裂抗拉峰值应变呈下降趋势，单轴抗压及劈裂抗拉应力-应变曲线的上升段斜率逐渐增大。 Abstract: The moisture content of C20, C30 and C40 concrete was studied by adjusting different soaking times(0, 2, 5, 24, 120 h), and the influence of moisture content on the compressive strength, splitting tensile strength, and stress-strain of concrete was studied. The results show that with the extension of soaking time, the moisture content of concrete increases rapidly in the early stage and slowly in the later stage, and basically reaches saturation state at 120 h. The compressive strength and splitting tensile strength of concrete decreases with the increase of moisture content, and the effect of moisture content is significant. The compressive strength and splitting tensile strength of saturated concrete are decreased by 36.35% and 32.36% compared with those of dry concrete. The mechanical properties of relatively lower strength grade concrete are more sensitive to moisture content. With the increase of moisture content, the peak strain of uniaxial compression and splitting tensile of concrete show a downward trend, and the slope of the rising section of uniaxial compression and splitting tensile stress-strain curve increases gradually.

宋致科,张国辉,顾艳霜,等.含水率对不同强度等级混凝土力学性能的影响试验研究[J].混凝土与水泥制品,2023(10):32-36. SONG Z K,ZHANG G H,GU Y S,et al.Experimental study on the effect of moisture content on the mechanical properties of concrete with different strength grades[J].China Concrete and Cement Products,2023(10):32-36.

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