摘   要：制备了适用于高低温环境的混凝土有机-无机复合抗裂养护剂（OICCA养护剂），研究了其对混凝土保水性能、力学性能及耐久性能的影响，并与两种市售养护剂（E-201、TSD）进行了对比，分析了其作用机理。结果表明：在40 ℃高温和-8 ℃低温环境下，与未涂覆养护剂的空白组相比，涂覆OICCA养护剂试件的抗裂性能显著提高；涂覆养护剂有效提高了混凝土的保水性能、力学性能及耐久性能；与E-201、TSD养护剂相比，OICCA养护剂的养护效果总体上相对较好；OICCA养护剂中的有机组分能使其成膜效果较好，无机组分能与水泥水化产物反应生成结晶物质密实孔隙，二者协同作用提升了混凝土的性能。 A concrete organic-inorganic composite anti-cracking curing agent(OICCA curing agent) suitable for high and low temperature environments was prepared. Its effects on the water retention, mechanical properties, and durability of concrete were studied, and compared with two commercially available curing agents(E-201, TSD) to analyze their mechanisms of action. The results show that under high temperature of 40 ℃ and low temperature of -8 ℃, compared with the blank group without coating curing agent, the crack resistance of OICCA curing agent coated specimens is significantly improved. The application of curing agents effectively improves the water retention, mechanical properties, and durability of concrete. Compared with E-201 and TSD curing agents, OICCA curing agent has a relatively better overall curing effect. The organic components in OICCA curing agent can achieve better film-forming effect, while the inorganic components can react with cement hydration products to form crystalline substances and compact pores. The synergistic effect of the two enhances the performance of concrete.

吉久发,叶梦煊,曹志国,等.高低温环境下混凝土有机-无机复合抗裂养护剂的制备及性能研究[J].混凝土与水泥制品,2024(12):1-8. JI J F,YE M X,CAO Z G,et al.Preparation and performance study of organic-inorganic composite anti-cracking curing agent for concrete in high and low temperature environments[J].China Concrete and Cement Products,2024(12):1-8.

摘   要：通过改变粉煤灰在矿物掺合料中的占比和水化热抑制剂（TRI）掺量，研究了TRI对水泥-粉煤灰-矿粉复合胶凝材料（复合胶材）水化过程和力学性能的影响，并通过测试TRI的吸附性能分析了其影响机理。结果表明：水泥对TRI的吸附能力最强，TRI虽能显著降低复合胶材早期水化放热速率峰值而不影响最终的水化程度，但会降低复合胶材的早期抗压强度；矿粉对TRI的吸附能力最弱，TRI对矿粉早期水化和火山灰反应的影响较小，且不影响其最终水化；粉煤灰对TRI的吸附能力相对较强，且TRI会严重影响粉煤灰的水化。 Abstract: The influence of hydration heat inhibitor(TRI) on the hydration process and mechanical properties of cement fly ash mineral powder composite cementitious materials(composite cementitious materials) was studied by changing the proportion of fly ash in mineral admixtures and the content of TRI added. The influence mechanism was analyzed by testing the adsorption performance of TRI. The results show that cement has the strongest adsorption capacity for TRI, which can significantly reduce the peak hydration heat release rate of composite cementitious materials in the early stage without affecting the final hydration degree, but will reduce the early compressive strength of composite cementitious materials. The adsorption capacity of mineral powder for TRI is the weakest, and TRI has little effect on the early hydration and volcanic ash reaction of mineral powder, and does not affect its final hydration. Fly ash has a relatively strong adsorption capacity for TRI, and TRI seriously affects the hydration of fly ash.

温东昌,曾柯林,杨蓉,等.水化热抑制剂对水泥-粉煤灰-矿粉复合胶凝材料水化反应的影响[J].混凝土与水泥制品,2024(12):9-13,28. WEN D C,ZENG K L,YANG R,et al.Effect of hydration heat inhibitor on the hydration reaction of composite cementitious materials with cement-fly ash-mineral powder[J].China Concrete and Cement Products,2024(12):9-13,28.

摘   要：研究了黏土陶砂预湿度（预湿水量分别为0、17.1、34.2 kg/m3）对轻质超高性能混凝土（LUHPC）工作性、力学性能、体积稳定性、抗氯离子渗透性能、抗盐雾侵蚀性能、抗低温性能和抗冻性能的影响，并分析了微观机理。结果表明：对黏土陶砂进行适当的预湿处理有助于改善LUHPC的工作性、力学性能、体积稳定性能、抗氯离子渗透性能、抗盐雾侵蚀性能、抗低温性能和抗冻性能；黏土陶砂预湿处理对LUHPC性能的提升主要归因于其优化了界面过渡区及改善了C-S-H凝胶结构。 Abstract: The effects of the pre-wetting degree of clay ceramic sand(pre-wetting water content was 0, 17.1 kg/m3, and 34.2 kg/m3, respectively) on the workability, mechanical property, volume stability, chloride ion penetration resistance, salt spray corrosion resistance, low temperature resistance, and frost resistance of lightweight ultra-high performance concrete (LUHPC) were investigated, and the micro-mechanisms were analyzed. The results show that, appropriate pre-wetting treatment of clay ceramic sand can help to improve the workability, mechanical property, volume stability, chlorine ion penetration resistance, salt spray corrosion resistance, low temperature resistance and frost resistance of LUHPC. The enhancement of LUHPC performance by the pre-wetting treatment of clay ceramic sand is attributed to the optimization of the interfacial transition zone and the improvement of the C-S-H gel structure.

鄢亦斌,刘开志,高立强,等.轻骨料预湿度对轻质UHPC性能及微观结构的影响[J].混凝土与水泥制品,2024(12):14-21. YAN Y B,LIU K Z,GAO L Q,et al.Effects of pre-wetting degree of lightweight aggregate on performance and microstructure of lightweight UHPC[J].China Concrete and Cement Products,2024(12):14-21.

摘   要：研究了SAP掺量、再生粗骨料（RCA）取代率对自密实混凝土（SCC）工作性、力学性能和收缩性能的影响规律。结果表明：SAP对SCC工作性的影响不大，而RCA取代率对SCC工作性的影响较大；当SAP掺量一定时，SCC的坍落扩展度随RCA取代率的增加而降低；当SAP掺量一定时，SCC的抗压强度、劈裂抗拉强度随RCA取代率的增加而降低；当RCA取代率为75%、100%时，SCC的抗压强度、劈裂抗拉强度相对接近；SCC的劈裂抗拉强度发展速率随RCA取代率的增加而降低；与对照组相比，掺SAP及RCA的SCC的28 d自收缩均有显著降低；当SAP掺量一定时，SCC的自收缩随着RCA取代率的增加而降低；当RCA取代率一定时，SCC的自收缩基本随着SAP掺量的增加而降低。 Abstract: The influence of SAP dosage and recycled coarse aggregate(RCA) substitution rate on the workability, mechanical properties, and shrinkage performance of self-compacting concrete(SCC) was studied. The results show that SAP has little effect on the workability of SCC, while RCA substitution rate has a greater impact on SCC workability. When the SAP dosage is constant, the slump expansion of SCC decreases with the increase of RCA substitution rate. When the SAP dosage is constant, the compressive strength and splitting tensile strength of SCC decrease with the increase of RCA substitution rate. When the RCA substitution rate is 75% and 100%, the compressive strength and splitting tensile strength of SCC are relatively close. The development rate of splitting tensile strength of SCC decreases with the increase of RCA substitution rate. Compared with the control group, the 28 d self-shrinkage of SCC doped with SAP and RCA is significantly reduced. When the SAP  dosage is constant, the self-shrinkage of SCC decreases with the increase of RCA substitution rate. When the RCA substitution rate is constant, the self-shrinkage of SCC basically decreases with the increase of SAP dosage.

黄英杰,张萌,曹建青,等.SAP内养护再生粗骨料自密实混凝土的性能研究[J].混凝土与水泥制品,2024(12):22-28. HUANG Y J,ZHANG M,CAO J Q,et al.Study on the performance of SAP internal curing recycled coarse aggregate self-compacting concrete[J].China Concrete and Cement Products,2024(12):22-28.

摘   要：研究了膨胀剂掺量（0、8%、10%、12%）对复掺粉煤灰及矿粉自密实混凝土工作性、力学性能、体积稳定性和耐久性能的影响，并分析了作用机理。结果表明：膨胀剂的掺入降低了自密实混凝土的扩展度，当膨胀剂掺量在8%~12%范围内时，其对自密实混凝土扩展度的影响较小；掺入适量膨胀剂能有效提高自密实混凝土的抗压强度和限制膨胀率，降低干燥收缩值、碳化深度和电通量；膨胀剂能与水反应，生成膨胀性结晶水化物钙矾石，适量可提高基体的密实度，补偿混凝土硬化过程中的收缩。 Abstract: The effect of the content of expansion agent(0, 8%, 10% and 12%) on the workability, mechanical property, volume stability and durability of self-compacting concrete mixed with fly ash and slag was investigated, and the action mechanism was analyzed. The results show that, the incorporation of expansion agent reduces the slump-flow of self-compacting concrete, and when the content of expansion agent is 8%~12%, it has small effect on the slump-flow of self-compacting concrete. The incorporation of appropriate content of expansion agent can effectively improve the compressive strength and restricted expansion rate, and reduce the drying shrinkage value, carbonation depth and electric flux of self-compacting concrete. Expansion agent can react with water and generate expansive hydration product ettringite, which improves the matrix compactness and compensates the shrinkage of concrete during hardening.

杨舜太,吕永进,杨俊,等.膨胀剂对复掺粉煤灰及矿粉自密实混凝土性能的影响[J].混凝土与水泥制品,2024(12):29-32,46. YANG S T,LYU Y J,YANG J,et al.Effect of the expansion agent on the performance of self-compacting concrete mixed with fly ash and slag[J].China Concrete and Cement Products,2024(12):29-32,46.

摘   要：研究了石灰石粉细度（比表面积分别为218、448、596 m2/kg）、水胶比（0.40、0.45、0.50）、水化温度（20 ℃、40 ℃）对胶凝材料体系水化进程的影响，并分析了石灰石粉的作用机理。结果表明：在20 ℃水化温度下，石灰石粉发挥填充、稀释、成核效应，随着石灰石粉掺量的增加，胶凝材料体系的水化放热速率峰值不断降低，诱导期结束时间基本提前；适当降低石灰石粉细度能促进胶凝材料体系的水化进程，但降低水胶比则起相反作用；适当升高水化温度可有效激发石灰石粉的水化活性，加速其火山灰效应，促进胶凝材料体系的水化进程。 Abstract: The effects of the fineness of limestone powder(specific surface area of 218, 448, 596 m2/kg, respectively), the water-binder ratio(0.40, 0.45, 0.50), and the hydration temperature(20 ℃, 40 ℃) on the hydration process of the cementitious material system were investigated, and the mechanism of the limestone powder was analyzed. The results show that, under the hydration temperature of 20 ℃, limestone powder plays the filling effect, dilution effect and nucleation effect, with the increase of the content of limestone powder, the peak value of the hydration exothermic rate of the cementitious material system decreases, and the terminal time of the induction period is basically in advance. Appropriate reduction of limestone powder fineness can promote the hydration process of cementitious material system, but reducing the water-binder ratio works in the opposite way. Appropriately elevating the hydration temperature can effectively stimulate the hydration activity of limestone powder, accelerate its volcanic ash effect, and promote the hydration process of cementitious material system.

朱鹏飞,余熠,石研然,等.水泥-石灰石粉胶凝材料体系水化放热规律研究[J].混凝土与水泥制品,2024(12):33-36. ZHU P F,YU Y,SHI Y R,et al.Study on the hydration exothermic law of cement-limestone powder cementitious material system[J].China Concrete and Cement Products,2024(12):33-36.