摘   要：对DT-PHC 400-350（80）AB-8和D-PHC 800-750（110）AB-12这两种竹节管桩开展了抗剪试验研究，得到了抗剪承载力、裂缝分布、破坏特征等指标，并将抗剪承载力试验值与计算值进行了对比。结果表明：采用桩身外径计算竹节管桩的抗剪承载力较为安全；竹节管桩的破坏形式为纯弯段底部受拉区钢棒拉断或桩身中部水平裂缝开展宽度过大；桩身裂缝出现前，各测点应变基本呈线性增长趋势；竹节管桩跨中受压区测点应变随荷载的增加而稳定增长，弯剪段测点应变与斜裂缝开展密切相关；桩身中部环向测点应变与水平裂缝开展密切相关。 Abstract: Shear tests were conducted on two types of nodular concrete piles, specifically DT-PHC 400-350(80)AB-8 and D-PHC 800-750(110)AB-12, to evaluate their shear bearing capacity, crack distribution, and failure characteristics. And the shear bearing capacity test values were compared with the calculated values. The results indicate that using the outer diameter of the pile body for calculating the shear bearing capacity of nodular concrete piles is relatively conservative and safe. The failure mode of nodular concrete piles is that the steel rod in the tensile zone at the bottom of the pure bending section breaks or the horizontal crack in the middle of the pile body develops too wide. Prior to cracks formation, strain at each measuring point shows a linear growth trend. In the mid-span compression zone, strain steadily increases with the increase of the applied load. Strain at the measuring point in the bending shear section is closely associated with the development of diagonal cracks. The strain of the circumferential measuring point in the middle of the pile body correlates with the progression of horizontal cracks.

陈克伟,曹伟伟.先张法预应力混凝土竹节管桩抗剪性能试验研究[J].混凝土与水泥制品,2025(3):44-47,53. CHEN K W,CAO W W.Experimental study on shear performance of pretensioned spun nodular concrete piles[J].China Concrete and Cement Products,2025(3):44-47,53.

摘   要：介绍了低碳混凝土的基本理念，总结了实现低碳混凝土的技术途径（直接减碳、间接减碳和碳汇技术）和混凝土碳排放评价方法，分析了低碳混凝土发展面临的挑战，并提出了低碳混凝土和抽水蓄能协同发展的技术理念。 Abstract: The fundamental concept of low-carbon concrete is introduced, the technical approaches(direct carbon reduction, indirect carbon reduction and carbon sequestration technology) to realize low-carbon concrete are summarized, and the evaluation methods of concrete carbon emission are sorted out, the challenges to the development of low-carbon concrete are analyzed. Furthermore, the technical concept of the synergistic development of low-carbon concrete and pumped storage is put forward.

刘硕,关彬.低碳混凝土技术研究与应用综述[J].混凝土与水泥制品,2025(3):86-89,93. LIU S,GUAN B.A review of research and application of low-carbon concrete technology[J].China Concrete and Cement Products,2025(3):86-89,93.

摘   要：通过正交试验研究了矿渣掺量（20%、30%、40%）、水胶比（0.30、0.33、0.36）和碱激发剂模数（1.2、1.4、1.6）对地聚物混凝土与既有混凝土试件（组合试件）界面黏结性能的影响。结果表明：组合试件呈脆性破坏，断裂面位于界面处；各因素对组合试件界面黏结性能影响的大小顺序为矿渣掺量＞碱激发剂模数＞水胶比，最佳配合比为矿渣掺量40%、水胶比0.36、碱激发剂模数1.4。 Abstract: The effects of the slag content(20%, 30%, 40%), water-binder ratio (0.30, 0.33, 0.36) and modulus(1.2, 1.4, 1.6) of alkali activator on the interfacial bonding performance between geopolymer concrete and existing concrete specimens(combined specimens) were investigated using an orthogonal experimental design. The results show that the combined specimens exhibit brittle failure, with the fracture surface primarily located at the interface. The effect of these factors on the interfacial bonding performance of combined specimens is ranked as follows: the content of slag ＞ modulus of alkali activator ＞ water-binder ratio. The optimal mix proportion is determined to be a slag content of 40%, the water-binder ratio of 0.36, and the modulus of alkali activator of 1.4.

姜天华,张淳,万聪聪,等.地聚物混凝土与既有混凝土界面黏结性能的试验研究[J].混凝土与水泥制品,2025(3):90-93. JIANG T H,ZHANG C,WAN C C,et al.Experimental study on the interfacial bonding performance between geopolymer concrete and existing concrete[J].China Concrete and Cement Products,2025(3):90-93.

摘   要：以水泥、铁尾矿砂和羟丙基甲基纤维素为主要原材料配制了干混砂浆，研究铁尾矿砂的颗粒级配对砂浆工作性和力学性能的影响，并进行了机理分析。结果表明：随着铁尾矿砂中粒径＜0.075 mm颗粒占比的减少，砂浆的稠度增大，保水率降低，7 d、28 d抗折与抗压强度均先增大后减小；综合考虑工作性和力学性能，建议铁尾矿砂的最佳颗粒级配为粒径＜0.075、0.075~0.150、0.150~0.300、0.300~0.600 mm的颗粒占比分别为10%、10%、50%、30%。 Abstract: A dry-mixed mortar was prepared by using cement, iron tailings sand, and hydroxypropyl methyl cellulose as the main raw materials. The influence of particle size distribution of iron tailings sand on the workability and mechanical properties of the mortar was studied, and the mechanism was analyzed. The results show that as the proportion of particles with particle size of less than 0.075 mm in the iron tailings sand decreases, the consistency of the mortar increases, the water retention rate decreases, and the 7 d and 28 d flexural strength and compressive strength first increase and then decrease. Taking into account both workability and mechanical properties, it is recommended that the optimal particle size distribution for iron tailings sand be 10%, 10%, 50%, and 30% of particles with particle sizes <0.075, 0.075~0.150, 0.150~0.300, and 0.300~0.600 mm, respectively.

宿常智,黄勇,杨秋菊,等.铁尾矿砂的颗粒级配对干混砂浆性能的影响[J].混凝土与水泥制品,2025(3):94-96,100. SU C Z,HUANG Y,YANG Q J,et al.Effects of particle size distribution of iron tailings sand on performance of dry-mixed mortar[J].China Concrete and Cement Products,2025(3):94-96,100.

摘  要：对比研究了单掺和复掺矿物掺合料（粉煤灰、超细矿粉、普通矿粉）对高性能混凝土（HPC）工作性、力学性能和早期抗裂性能的影响。结果表明：当超细矿粉与粉煤灰以8∶2质量比复掺时，混凝土的工作性较好，28 d抗压强度最高，早期抗裂性能最好；单掺超细矿粉组试件的28 d抗折强度略均低于单掺普通矿粉组试件，矿粉与粉煤灰复掺组试件的28 d抗折强度略低于对应的单掺矿粉组试件；综合而言，相比超细矿粉与粉煤灰2∶8和5∶5的复掺比例，8∶2复掺时，HPC的综合性能最好。 Abstract: The effects of individual and compound mixing of mineral admixtures(fly ash, ultrafine mineral powder, and ordinary mineral powder) on the workability, mechanical properties, and early cracking resistance of high-performance concrete(HPC) were investigated comparatively. The results show that when ultrafine mineral powder and fly ash are mixed in the mass ratio of 8∶2, the concrete has the good workability, the highest 28 d compressive strength, and the greatest early cracking resistance. The 28 d flexural strength of specimen with ultrafine mineral powder alone is slightly lower than that of the specimen with ordinary mineral powder alone, and the 28 d flexural strength of specimen with composite addition of mineral powder and fly ash is slightly lower than that of specimen with mineral powder alone. Overall, compared to the compounding ratios of 2∶8 and 5∶5 for ultrafine mineral powder and fly ash, when the compounding ratio is 8∶2, HPC exhibits the best comprehensive performance.

摘   要：研究了粉磨时间对循环流化床粉煤灰（CFB灰）性能及水化特性的影响。结果表明：随着粉磨时间的增加，CFB灰颗粒变细，表面粗糙程度降低，28 d强度活性指数基本呈先增大后减小的趋势，最佳粉磨时间为4 min；适当时间的粉磨处理使得水泥-CFB灰复合胶凝材料的水化诱导期延长，累计放热量减小，水化产物C-S-H、AFt的生成量增多；水泥-CFB灰复合胶凝材料的早期反应以水泥水化为主，CFB灰主要起微集料填充效应，随着龄期的增加，CFB灰的火山灰活性增强。 Abstract: The influence of grinding time on the performance and hydration characteristics of circulating fluidized bed fly ash (CFB ash) was studied. The results show that with the increase of grinding time, the CFB ash particles become finer, the surface roughness decreases, and the 28 d strength activity index show a trend of first increasing and then decreasing, and the optimal grinding time is 4 min. Appropriate time for grinding treatment prolongs the hydration induction period of cement-CFB ash composite cementitious materials, reduces the cumulative heat release, and increases the generation of hydration products C-S-H and AFt. The early reaction of cement-CFB ash composite cementitious material is mainly cement hydration, and CFB ash mainly plays a role in micro aggregate filling. With the increase of age, the volcanic ash activity of CFB ash increases.

胡瑶瑶,邵明扬,张宁,等.粉磨时间对循环流化床粉煤灰性能及水化特性的影响[J].混凝土与水泥制品,2025(3):101-105. HU Y Y,SHAO M Y,ZHANG N,et al.Effect of grinding time on performance and hydration characteristics of circulating fluidized bed fly ash[J].China Concrete and Cement Products,2025(3):101-105.