摘   要：研究了水化温升抑制剂TR01B对掺钙类膨胀剂砂浆性能的影响。结果表明：TR01B主要影响砂浆的早期抗压强度，对凝结时间也有一定的影响，但对后期抗压强度的影响较小；掺TR01B可以降低水泥早期水化放热速率峰值、温度峰值及放热量；TR01B能够调控钙类膨胀剂的膨胀效能，延缓了水泥早期水化产物的生成，同时不影响水泥后期的水化程度。 Abstract: The effect of hydration temperature rise inhibitor TR01B on the performance of mortar with calcium based expansion agents was studied. The results show that TR01B mainly affects the early compressive strength of mortar and has a certain impact on the setting time, but its impact on the later compressive strength is relatively small. Adding TR01B can reduce the early hydration heat release peak rate, temperature peak, and heat release of cement. TR01B can regulate the expansion efficiency of calcium based expansion agents, delay the generation of early hydration products of cement, while do not affect the hydration degree of cement in the later stage.

储阳,王瑞,王文彬,等.水化温升抑制剂对钙类膨胀剂变温膨胀效能的影响[J].混凝土与水泥制品,2024(6):1-5,11. CHU Y,WANG R,WANG W B,et al.Effect of hydration temperature rise inhibitor on the temperature varying expansion efficiency of calcium based expansion agents[J].China Concrete and Cement Products,2024(6):1-5,11.

摘   要：通过模糊层次分析法（FAHP）确定了花岗岩混凝土最优配合比为总目标，准则层影响因素包括制作成本B1、性能B2、生产效益B3；指标层影响因素包括人工成本C1、机械设备成本C2、原材料成本C3、7 d抗压强度C4、28 d抗压强度C5、坍落度C6、扩展度C7、经济效益C8、环境效益C9，并对试验组配合比进行了评价，建立了模糊一致性矩阵，最终得到了模糊综合评价结果。该模型可相对客观地选择花岗岩混凝土的最优配合比。 Abstract: The fuzzy analytic hierarchy process(FAHP) was used to determine the optimal mix proportion of granite concrete as the overall objective, with the influencing factors of the criterion layer including production cost B1, performance B2, and production efficiency B3. The influencing factors of the indicator layer included labor cost C1, mechanical equipment cost C2, raw material cost C3, 7 d compressive strength C4, 28 d compressive strength C5, slump C6, expansion C7, economic benefit C8, and environmental benefit C9. The experimental group mix proportions were evaluated, and a fuzzy consistency matrix was established, and the final fuzzy comprehensive evaluation result was obtained. This model can objectively select the optimal mix proportion of granite concrete.  

吕韶全.基于FAHP模型的C50花岗岩混凝土配合比评价与优选[J].混凝土与水泥制品,2024(6):6-11. LYU S Q.Evaluation and optimization of C50 granite concrete mix proportions based on FAHP model[J].China Concrete and Cement Products,2024(6):6-11.

摘   要：研究了养护方式及不同风积沙掺量对3D打印砂浆力学性能及收缩性能的影响，并进行了现场打印试验。结果表明：现场养护（覆膜、洒水）有利于3D打印砂浆抗折强度的发展，而试验室养护（恒温水浴）有利于3D打印砂浆抗压强度的发展；随着风积沙取代率的增加，3D打印砂浆各龄期的抗压强度先增加后降低，当风积沙取代率为60%时，28 d抗压强度达到峰值；现场养护条件下，3D打印砂浆的体积变化表现为收缩；试验室养护条件下，3D打印砂浆表现为微膨胀；现场养护条件下，水泥水化生成较多AFt穿插在胶凝体系中，充当骨架作用，提高了3D打印砂浆的抗折强度；试验室养护条件下，水泥水化生成较多较致密的C-S-H、Al(OH)3等水化产物，提高了3D打印砂浆的抗压强度；现场打印试验也进一步证实了掺风积沙3D打印砂浆具有优异的性能。 Abstract: The effects of curing methods and different amounts of aeolian sand on the mechanical and shrinkage properties of 3D printed mortar were studied, and field printing experiments were conducted. The results show that the field curing method(film coating and watering) is beneficial to the development of flexural strength of 3D printed mortar, while the laboratory curing method(thermostatic water bath) shows a positive impact on the compressive strength of 3D printed mortar. With the increase of aeolian sand replacement rate, the compressive strength of 3D printed mortar at each age increases first and then decreases. When the replacement rate of aeolian sand is 60%, the compressive strength at 28 d reaches maximum values. Under the condition of field curing, the 3D printed mortar is shrinkage, and it shows micro-expansion under the condition of laboratory curing. For the field curing method, more hydration products of AFt generated by cement hydration are interspersed in the cementitious system, which acts as a skeleton and improves the flexural strength of 3D printed mortar. Under the condition of laboratory curing, there are more dense hydration products of C-S-H, Al(OH)3, etc. induced by the hydration of cement, thus improving the compressive strength of 3D printed mortar. The field printing tests also confirmes that the 3D printed mortar incorporates with aeolian sand exhibites better performance.

周港明,杨富民,孙成晓,等.风积沙3D打印砂浆力学及收缩性能试验研究[J].混凝土与水泥制品,2024(6):12-17. ZHOU G M,YANG F M,SUN C X,et al.Experimental study on the mechanical and shrinkage properties of 3D printed mortar with aeolian sand[J].China Concrete and Cement Products,2024(6):12-17.

摘   要：研究了不同掺量的减缩剂（SRA）对水泥砂浆塑性收缩开裂、水泥水化热、水泥砂浆毛细管负压的影响，以及SRA掺量（1%、3%、4%）对超高性能混凝土（UHPC）抗压强度和收缩性能的影响。结果表明：SRA可显著降低水泥砂浆的开裂面积、平均和最大裂缝宽度，当SRA掺量为4%时，缓解塑性收缩开裂的效果最佳，开裂面积、平均和最大裂缝宽度与基准组相比分别降低了52.1%、35.0%和48.4%；SRA通过延缓毛细管负压的发展，降低了水泥砂浆的塑性收缩开裂；随着SRA掺量的增加，UHPC的抗压强度提高越明显，UHPC的收缩显著降低；当减缩剂掺量为4%时，UHPC的28 d抗压强度达140.0 MPa，收缩率最低。 Abstract: The effects of different contents of shrinkage reducer(SRA) on plastic shrinkage cracking of cement mortar, heat of hydration of cement, and negative capillary pressure of cement mortar were studied. The effects of SRA content (1%, 3% and 4%) on the compressive strength and shrinkage properties of ultra-high performance concrete(UHPC) were investigated. The results show that SRA can significantly reduce the cracking area, average and maximum crack width of cement mortar. The best effect of mitigating plastic shrinkage cracking is achieved when the SRA content is 4%, and the cracking area, average and maximum crack widths are reduced by 52.1%, 35.0% and 48.4%, respectively, compared with the baseline group. SRA reduces the plastic shrinkage cracking of cement mortar by delaying the development of capillary negative pressure. With the increase of SRA content, the compressive strength of UHPC improves significantly, and the shrinkage of UHPC decreases significantly. When the content of shrinkage reducer is 4%, the 28 d compressive strength of UHPC reaches 140.0 MPa, with the lowest shrinkage rate.

邹小童,武建好,李星辰,等.减缩剂对水泥砂浆及超高性能混凝土收缩性能的影响[J].混凝土与水泥制品,2024(6):18-21,26. ZOU X T,WU J H,LI X C,et al.Effect of shrinkage reducer on shrinkage properties of mortar and ultra-high performance concrete[J].China Concrete and Cement Products,2024(6):18-21,26.

摘   要：采用凝灰岩湿法制砂工艺产生的废石粉经烘干、粉碎处理后（湿法石粉）部分取代水泥制备了水泥胶砂，研究了此类石粉取代率对水泥胶砂流动度、强度、水化进程和孔结构的影响，并与采用干法制砂工艺产生的废石粉（干法石粉）制备的胶砂性能进行了对比。结果表明：增加湿法石粉取代率会降低水泥胶砂的流动度和强度，且降低程度高于相同条件下采用干法石粉制备的水泥胶砂；当湿法石粉取代率不大于20%时，石粉7 d和28 d的活性指数均高于60%；湿法石粉取代率的增加降低了水泥水化产物含量，导致水泥浆体的总孔隙率增大，但降低了水泥浆体内部多害孔的比例。 Abstract: The waste stone powder generated by the wet sand making process of tuff was dried and crushed to obtain wet process stone powder, and the wet process stone powder was used to replace some cement to prepare cement mortar. The influence of the substitution rate of such stone powder on the fluidity, strength, hydration process, and pore structure of cement mortar was studied, and the performance was compared with the performance of the mortar prepared by dry process stone powder, among which the dry process stone powder was produced by dry sand making process. The results show that increasing the substitution rate of wet process stone powder will reduce the flowability and compressive strength of cement mortar, and the degree of reduction is higher than that of cement mortar prepared by dry process stone powder under the same conditions. When the substitution rate of wet process stone powder is not greater than 20%, the activity index of stone powder at 7 d and 28 d is higher than 60%. The increase in the substitution rate of wet process stone powder reduces the content of cement hydration products, leading to an increase in the total porosity of the cement slurry, but reducing the proportion of multiple harmful pores inside the cement slurry.

麻旭荣,王振,付士帅,等.湿法制砂废石粉取代率对水泥胶砂性能的影响[J].混凝土与水泥制品,2024(6):22-26. MA X R,WANG Z,FU S S,et al.Effect of wet making sand waste stone powder substitution rate on the performance of cement mortar[J].China Concrete and Cement Products,2024(6):22-26.

摘   要：合成了一种丙烯酸-环氧树脂涂层，研究了海水浸泡条件下涂覆丙烯酸-环氧涂层混凝土的力学性能、耐久性能，并对其水化产物及微观结构进行了分析。结果表明：在海水浸泡条件下，相较于无涂层对照组，涂覆丙烯酸-环氧树脂涂层的混凝土抗压、劈裂抗拉强度均相对较高，表面pH值减小幅度较小，抗氯离子渗透性能较好，可以保持混凝土内部的高碱性，水化产物中水化硅酸钙含量相对较高，基体结构致密，孔隙和微裂纹较少。涂覆丙烯酸-环氧树脂涂层可使海工混凝土具有优异的力学性能和耐久性能。 Abstract: A acrylic epoxy-resin coating was synthesized, and the mechanical and durability properties of concrete coated with acrylic epoxy-resin coating under seawater immersion conditions were studied. The hydration products and microstructure of the concrete were analyzed. The results show that under seawater immersion conditions, compared with the uncoated control group, the concrete with acrylic epoxy-resin coating has relatively higher compressive and splitting tensile strength, smaller reduction in surface pH value, better resistance to chloride ion penetration, and can maintain high alkalinity inside the concrete. The content of hydrated calcium silicate in the hydration product is relatively high, the matrix structure is dense, and there are fewer pores and microcracks. The marine concrete coated with acrylic epoxy-resin coating has excellent mechanical and durability properties.

殷铭良,王红霞,戴培赟,等.丙烯酸-环氧树脂涂层对海工混凝土防腐性能的影响[J].混凝土与水泥制品,2024(6):27-30,42. YIN M L,WANG H X,DAI P Y,et al.Influence of acrylic epoxy-resin coating on the anti-corrosion performance of marine concrete[J].China Concrete and Cement Products,2024(6):27-30,42.