摘   要：介绍了一种利用X-CT技术表征透水混凝土试件内部孔结构并获得连通孔隙的方法，研究了水灰比、骨灰比和骨料粒径对试件透水系数、孔结构的影响，分析了有效孔隙率与总孔隙率之间的关系，并建立了透水混凝土透水系数的经验模型。结果表明：增加水灰比会降低试件的透水系数和连通孔隙率；随着骨灰比和骨料粒径的增加，试件的连通孔隙率和透水系数呈上升趋势。 Abstract: A method was introduced to characterize the internal pore structure of pervious concrete specimens and obtain connected pores using X-CT technology. The effects of water-cement ratio, aggregate-cement ratio, and aggregate particle size on the pervious coefficient and pore structure of specimens were studied. The relationship between effective porosity and total porosity was analyzed, and an empirical model for the pervious coefficient of pervious concrete was established. The results indicate that increasing the water-cement ratio will reduce the pervious coefficient and connectivity porosity of the specimens. As the aggregate-cement ratio and aggregate size increase, the connectivity porosity and pervious coefficient of the specimen show an upward trend.

杨枫林,赵亚松,倪凯翔,等.基于X-CT技术的透水混凝土透水性能研究[J].混凝土与水泥制品,2025(1):1-6. YANG F L,ZHAO Y S,NI K X,et al.Research on the pervious performance of pervious concrete based on X-CT technology[J].China Concrete and Cement Products,2025(1):1-6.

摘   要：提出了一种基于水胶密度比规律的配合比设计方法，以抗压强度和表观密度为设计目标制备了砂浆和混凝土，对设计目标进行了试验验证，并对比了基于水胶密度比规律设计方法与鲍罗米公式设计方法在计算结果在主要参数上的不同。结果表明：采用基于水胶密度比规律设计方法制备的砂浆与混凝土的表观密度和实测28 d抗压强度与设计目标基本一致，R2分别达到0.891和0.888，且砂浆与混凝土具有可控的工作性；基于水胶密度比规律的设计方法能够实现砂浆与混凝土抗压强度和表观密度的同时设计，具有一定的科学性和实用性。 Abstract: A mix proportion design method based on the water-binder-density ratio law was proposed, and mortar and concrete were prepared with compressive strength and apparent density as design objectives. The design objectives were experimentally verified, and the differences in the main parameters of the calculation results between the design method based on the water-binder-density ratio law and the Baum formula design method were compared. The results show that the apparent density and measured 28 d compressive strength of mortar and concrete prepared by the design method based on the water-binder-density ratio law are basically consistent with the design objectives, with R2 values of 0.891 and 0.888, respectively, and the mortar and concrete have controllable workability. The design method based on the water-binder-density ratio law can achieve the simultaneous design of compressive strength and apparent density of mortar and concrete, and has a certain degree of scientific and practical significance.

张宇,杨进波,李瑞超,等.基于水胶密度比规律的砂浆与混凝土设计方法研究[J].混凝土与水泥制品,2025(1):7-11. ZHANG Y,YANG J B,LI R C,et al.Research on the design method of mortar and concrete based on the water-binder-density ratio law[J].China Concrete and Cement Products,2025(1):7-11.

摘   要：掺入30%、50%比例的Ⅲ类水泥基灌浆料制备了混合料，采用普通混凝土力学性能试验方法和工程岩体试验方法研究了Ⅲ类、Ⅳ类水泥基灌浆料及其混合料的力学性能与单轴受压应力-应变关系，建立了立方体抗压强度与轴心抗压强度转化、弹性模量、峰值应变等的计算公式，并基于过镇海模型应力-应变曲线公式，提出了适用于水泥基灌浆料及其混合料的单轴受压本构模型。结果表明：Ⅲ类水泥基灌浆料的韧性高于Ⅳ类水泥基灌浆料；随着Ⅲ类水泥基灌浆料掺量的提高，50%混合料的韧性也得到了一定的提高；过镇海模型拟合曲线与试验曲线总体上吻合较好。 Abstract: A mixture was prepared by adding 30% and 50% of Class Ⅲ cement-based grouting. The mechanical properties and uniaxial compressive stress-strain relationship of Class Ⅲ and Ⅳ cement-based grouting and their mixture were studied using ordinary concrete mechanical property testing methods and engineering rock mass testing methods. Calculation formulas for the conversion between cubic compressive strength and axial compressive strength, elastic modulus, peak strain, etc. were established. Based on the stress-strain curve formula of the Guozhenhai model, a uniaxial compression constitutive model applicable to cement-based grouting materials and its mixtures was proposed. The results indicate that the toughness of Class Ⅲ cement-based grouting is higher than that of Class Ⅳ cement-based grouting. With the increase of the dosage of Class Ⅲ cement-based grouting, the toughness of the mixture has also been improved to a certain extent. The fitting curves of the Guozhenhai model is generally in good agreement with the experimental curves.

李其廉,刘毅,敦彦茹,等.水泥基灌浆料及其混合料的单轴受压应力-应变研究[J].混凝土与水泥制品,2025(1):12-18,24. LI Q L,LIU Y,DUN Y R,et al.Study on uniaxial compressive stress-strain of cement-based grouting and its mixture[J].China Concrete and Cement Products,2025(1):12-18,24.

摘   要：以辽宁省某隧道工程为依托，采用数值模拟方法研究了隧道高强衬砌混凝土的水化热，分析了其内部温度的变化规律，采用极差、方差分析方法研究了冷却水管的流量、入流温度和直径3个因素对混凝土水化热的影响。结果表明：冷却水管的3个因素对混凝土水化热的影响程度依次为：入流温度＞直径＞流量；温度调控建议冷却水管设置间距为1 m、流量为1.2 m3/h、入流温度为20 ℃、直径为30 mm，该控温措施有助于降低混凝土的内外温差，有效预防温度裂缝的产生，从而提高隧道高强衬砌混凝土结构的安全性和耐久性能。 Abstract: Based on a tunnel project in Liaoning Province, a numerical simulation method was used to study the hydration heat and the temperature changes of high-strength lining concrete during the hydration process. Further, the polar variance method was used to systematically analyze the effects of flow rate, inflow temperature, and diameter of cooling water pipe on the hydration heat of high-strength lining concrete in tunnels. The results indicate that the degree of influence of the three factors of cooling water pipes on the hydration heat of high-strength lining concrete in tunnels is as follows: inlet temperature > diameter > flow rate. Specific suggestions for temperature regulation include using cooling water pipes with a spacing of 1 m, a flow rate of 1.2 m3/h, an inlet temperature of 20 ℃, and a diameter of 30 mm. These measures help to reduce temperature differences and effectively prevent the occurrence of temperature cracks, thereby improving the safety and durability of high-strength lining concrete structures in tunnels.

张恺瑞,陈四利,王军祥,等.隧道高强衬砌混凝土水化热与温度调控技术研究[J].混凝土与水泥制品,2025(1):19-24. ZHANG K R,CHEN S L,WANG J X,et al.Research on hydration heat and temperature control technology of high-strength lining concrete in tunnels[J].China Concrete and Cement Products,2025(1):19-24.

摘   要：采用N-羟甲基丙烯酰胺水溶液与粒径为0.08~0.10 mm的蛇纹石粉末制备了外加剂，研究了掺该外加剂的蛇纹石混凝土高温后的性能。结果表明：掺N-羟甲基丙烯酰胺蛇纹石粉末复合外加剂的蛇纹石混凝土具有良好的高温防辐射能力；N-羟甲基丙烯酰胺蛇纹石粉末复合外加剂对蛇纹石混凝土高温前后的轴心抗压强度均有提高作用，同时，还可以提高高温后力学性能的稳定性。 Abstract: An admixture was prepared using N-hydroxymethacrylamide aqueous solution and serpentine powder with a particle size of 0.08~0.10 mm, and the properties of serpentine concrete after high temperature were studied. The results indicate that the serpentine concrete mixed with N-hydroxymethylacrylamide serpentine powder composite admixture has good high-temperature radiation resistance. The N-hydroxymethylacrylamide serpentine powder composite admixture can improve the axial compressive strength of serpentine concrete before and after high temperature, and also enhance the stability of mechanical properties after high temperature.

石建军,汪佳乐,李景阳,等.掺蛇纹石粉末的N-羟甲基丙烯酰胺复合外加剂对混凝土性能的影响[J].混凝土与水泥制品,2025(1):25-28,33. SHI J J,WANG J L,LI J Y,et al.Effect of N-hydroxymethylacrylamide composite admixture with serpentine powder on the properties of concrete[J].China Concrete and Cement Products,2025(1):25-28,33.

摘   要：为满足长沙黄花机场T3航站楼指廊区域对混凝土高耐久补偿收缩的要求，制备了C35高耐久补偿收缩混凝土，并研究了单掺粉煤灰、复掺矿粉和粉煤灰、膨胀剂掺量对该类混凝土力学性能、限制膨胀率和耐久性能的影响。结果表明：高耐久补偿收缩混凝土的最佳配合比为C35-3组；工程实际应用表明，混凝土的28 d抗压强度为47.2 MPa，14 d水中限制膨胀率为2.6×10-4，28 d干燥收缩为189με，28 d电通量为284 C，28 d碳化深度为12 mm，抗硫酸盐侵蚀等级达KS90，均满足工程使用要求。 Abstract: In order to meet the requirements of high durability compensating shrinkage of concrete in the pier area of Terminal 3 of Changsha Huanghua Airport, C35 high durability compensated shrinkage concrete was prepared, and the effects of single fly ash, composite mineral powder and fly ash, and content of expansion agent on the mechanical properties, limited expansion rate, and durability of this type of concrete were studied. The results show that the optimal mix proportion for high durability compensated shrinkage concrete is C35-3 group. Practical engineering applications show that the compressive strength of concrete at 28 d is 47.2 MPa, the limited expansion rate in water at 14 d is 2.6×10-4, the drying shrinkage at 28 d is 189με, the electrical flux at 28 d is 284 C, the carbonation depth at 28 d is 12 mm, and the resistance to sulfate corrosion reaches KS90, all of which meet the requirements for engineering use.

林清,朱正荣,周栋,等.高耐久补偿收缩混凝土试验研究及工程应用[J].混凝土与水泥制品,2025(1):29-33. LIN Q,ZHU Z R,ZHOU D,et al.Experimental study and engineering application of high durability compensated shrinkage concrete[J].China Concrete and Cement Products,2025(1):29-33.