摘   要：配制了浓度为2 g/L的盐酸多巴胺改性溶液，并配合超声分散法对聚对苯二甲酸乙二醇酯（Polyethylene terephthalate，PET）纤维进行了表面改性处理，研究了浸泡改性时间（0、24、48、72 h）和超声分散处理对PET纤维及其水泥基材料性能的影响。结果表明：随着浸泡改性时间的延长，PET纤维表面的多巴胺沉积量增多，亲水性增强，掺改性PET纤维水泥基材料的力学性能提升；在浸泡改性基础上，辅以超声分散处理，可有效提高PET纤维的亲水性，增强其与水泥基体的界面结合力，进而提高水泥基材料的抗压和抗折强度。研究成果可为表面改性技术的应用及纤维增强混凝土性能的优化提供参考。Abstract: In order to investigate the effects of different modification times and ultrasonic dispersion treatment on the microstructure and functional properties of hydrochloride dopamine modified polyethylene terephthalate (PET) fibers, and further analyze their improvement effect on the properties of cement-based materials, a hydrochloride dopamine-modified solution with a concentration of 2 g/L was prepared, and the surface modification treatment was carried out on PET fibers using ultrasonic dispersion method. The effects of immersion modification time (0, 24, 48, 72 h) and ultrasonic dispersion treatment on the properties of PET fiber and its cement-based materials were investigated. The results show that, as the immersion modification time increases, the dopamine deposition on the surface of PET fiber increases, the hydrophilicity is enhanced, and the mechanical properties of cement-based materials doped with modified PET fiber are improved. Additionally, supplementary ultrasonic dispersion treatment further enhances the hydrophilicity of PET fiber and strengthens the interfacial bonding with the cement matrix, thereby improving the compressive strength and flexural strength of the cement-based materials. The research results can provide reference for the application of surface modification technology and the optimization of fiber reinforced concrete performance.

龙武剑,赵泰淇,罗启灵,等.多巴胺改性与超声分散处理对PET纤维及其水泥基材料性能的影响研究[J].混凝土与水泥制品,2026,53(3):42-46. LONG W J,ZHAO T Q,LUO Q L,et al.Study on effects of dopamine modification and ultrasonic dispersion treatment on the properties of PET fiber and its cement-based materials[J].China Concrete and Cement Products,2026,53(3):42-46 (in Chinese).

摘   要：选取了与水泥和非离子型水性环氧树脂（Nonionic waterborne epoxy，NEP）具有良好相容性的聚丙烯酸酯乳液（Polyacrylate emulsion，PAE）对掺NEP的水下不分散砂浆进行了改性，通过测试砂浆的流动度、凝结时间和水下抗分散性能（浊度、质量损失率），研究了PAE掺量（15.0%、17.5%、20.0%、22.5%、25.0%）、胶砂比（1∶1.25、1∶1.50、1∶1.75）对砂浆性能的影响。结果表明：相同胶砂比下，随着PAE掺量的增加，砂浆的流动度增加；相同PAE掺量下，随着胶砂比的增加，砂浆的流动度增加；相同胶砂比下，随着PAE掺量的增加，砂浆的浊度及质量损失率均增加，PAE的掺入对砂浆水下抗分散性能具有削弱作用；相同PAE掺量下，当胶砂比为1∶1.50时，砂浆的水下抗分散性能最佳；相同胶砂比下，随着PAE掺量的增加，砂浆的凝结时间延长；整体上，胶砂比变化对砂浆的凝结时间并无显著影响。研究结果可为水工建筑的高质量修补加固提供参考。Abstract: Polyacrylate emulsion (PAE), which had good compatibility with cement and nonionic waterborne epoxy (NEP), was selected to modify the underwater non dispersible mortar containing NEP. By testing the flowability, setting time, and underwater anti-dispersion performance (turbidity, mass loss rate) of mortar, the influence of PAE dosage (15.0%, 17.5%, 20.0%, 22.5%, 25.0%) and binder-sand ratio (1∶1.25, 1∶1.50, 1∶1.75) on mortar performance was studied. The results show that under the same binder-sand ratio, the flowability of the mortar increases with the increase of PAE dosage. Under the same PAE dosage, the flowability of the mortar increases with the increase of the binder-sand ratio. Under the same binder-sand ratio, with the increase of PAE content, the turbidity and mass loss rate of the mortar increase. The addition of PAE has a weakening effect on the underwater anti-dispersion performance of the mortar. Under the same PAE dosage, when the binder-sand ratio is 1∶1.50, the underwater anti-dispersion performance of the mortar is optimal. Under the same binder-sand ratio, as the PAE dosage increases, the setting time of the mortar is prolonged. Overall, variations in the binder-sand ratio have no significant effect on the mortar setting time. The research findings can provide a reference for the high-quality repair and reinforcement of hydraulic structures.

韩雪松,王强,孟星宇,等.PAE对掺NEP水下不分散砂浆性能的影响研究[J].混凝土与水泥制品,2026,53(3):38-41,46. HAN X S,WANG Q,MENG X Y,et al.Study on the effect of PAE on the performance of underwater non dispersible mortar with NEP addition[J].China Concrete and Cement Products,2026,53(3):38-41,46 (in Chinese).

摘   要：研究了丁苯乳液（Styrene-butadiene emulsion，SB）和纳米SiO2（Nano-silica，NS）单掺、复掺（SB掺量为0%、10%、20%，NS掺量为0、0.5%、1.0%、1.5%、2.0%）对聚乙烯醇（Polyvinyl alcohol，PVA）纤维增强砂浆力学性能（抗折强度、抗压强度）、韧性（断裂能、压折比）的影响，并优选出最佳掺量。结果表明：单掺SB会降低砂浆的3 d抗折、抗压强度和7 d、28 d抗压强度，但会提高7 d、28 d抗折强度；随着NS单掺掺量的增加，砂浆3 d和7 d抗折强度波动增加，28 d抗折强度先增后降，3 d抗压强度基本增加，7 d和28 d抗压强度基本先增后降；SB与NS具有良好的协同作用，适宜掺量下二者复掺可以提高砂浆的力学性能；SB对砂浆的韧性影响较大，而NS对砂浆的韧性影响不显著；当NS掺量为1.0%、SB掺量为20%时，砂浆的强度较高，同时具有较好的韧性。Abstract: The effects of styrene-butadiene emulsion (SB) and nano-SiO2 (NS) on the mechanical properties (flexural strength, compressive strength) and toughness (fracture energy, compressive-to-flexural ratio) of polyvinyl alcohol (PVA) fiber reinforced mortar were investigated through single and combined addition methods (SB content is 0, 10%, 20%, and NS content is 0, 0.5%, 1.0%, 1.5%, 2.0%). The optimal content was determined. The results show that single addition of SB reduces the 3 d flexural and compressive strength, as well as the 7 d and 28 d compressive strength, but increases the 7 d and 28 d flexural strength of mortar. With the increase of the single addition content of NS, the flexural strength of the mortar shows a fluctuating increase at 3 d and 7 d, the 28 d flexural strength increases initially and then decreases, the compressive strength basically increases at 3 d, while the compressive strength basically increases first and then decreases at 7 d and 28 d. SB and NS exhibit a good synergistic effect. At appropriate content levels, their combination can enhance the mechanical properties of mortar. SB has a significant impact on the toughness of mortar, while the influence of NS on mortar toughness is not significant. When the NS content is 1.0% and the SB content is 20%, the mortar exhibits relatively high strength along with good toughness.

赵通顺,张旭亮,王博,等.丁苯乳液与纳米SiO2对PVA纤维增强砂浆力学性能的优化研究[J].混凝土与水泥制品,2026,53(3):33-37,46. ZHAO T S,ZHANG X L,WANG B,et al.Optimization of mechanical properties of PVA fiber reinforced mortar based on styrene-butadiene emulsion and nano-SiO2[J].China Concrete and Cement Products,2026,53(3):33-37,46 (in Chinese).

摘   要：研究了纳米CaCO3掺量（0、0.5%、1.0%、1.5%、2.0%、2.5%）对钢-聚丙烯混杂纤维增强混凝土工作性、力学性能、弯曲韧性和断裂性能的影响，并进行了数值模拟分析。结果表明：随着纳米CaCO3掺量的增加，混凝土拌和物的流动度先增大后减小，试件的28 d抗折强度、抗压强度、弯曲韧性和断裂能均先增大后减小；综合考虑性能，纳米CaCO3的最佳掺量为1.5%；所建立的纳米CaCO3与混杂纤维协同增强混凝土的数值模型精度较高，28 d抗折强度、抗压强度模拟值与试验值的误差均小于10.00%，可用于该类混凝土的性能预测。研究结果可为该类高性能混凝土在超高层建筑、大跨度桥梁等工程中的规模化应用提供参考。Abstract: The effects of the content (0, 0.5%, 1.0%, 1.5%, 2.0%, 2.5%) of nano-CaCO3 on the workability, mechanical properties, bending toughness, and fracture performance of steel-polypropylene hybrid fiber reinforced concrete were studied, and the numerical simulation analysis was conducted. The results show that with the increase of the content of nano-CaCO3, the flowability of the concrete mixture first increases and then decreases, and the 28 d flexural strength, compressive strength, bending toughness, and fracture energy of the specimens first increase and then decrease. Considering performance comprehensively, the optimal content of nano-CaCO3 is 1.5%. The numerical model established for the nano-CaCO3 and hybrid fiber synergistically reinforced concrete has high accuracy. The error between the simulated and experimental values of 28 d flexural strength and compressive strength is less than 10.00%, which can be used for predicting the performance of this type of concrete. The research findings can provide a reference for the large-scale application of this type of high-performance concrete in projects such as super high-rise buildings and long-span bridges.

周辰泠,苏谦,吕悦.纳米CaCO3与混杂纤维协同增强混凝土的性能研究与数值模拟分析[J].混凝土与水泥制品,2026,53(3):27-32. ZHOU C L,SU Q,LYU Y.Performance study and numerical simulation analysis of nano-CaCO3 and hybrid fiber synergistically reinforced concrete[J].China Concrete and Cement Products,2026,53(3):27-32 (in Chinese).