摘   要：为充分发挥无机修复材料在混凝土结构损伤中的应用，研究了骨料种类及粒径、减水剂掺量、胶砂比、胶粉掺量、聚丙烯（PP）纤维掺量、消泡剂掺量对自密实快速修复砂浆工作性及力学性能的影响。结果表明：石英砂砂浆比河砂砂浆有更高的抗压强度，但韧性较差；综合考虑性能及经济性，减水剂掺量为1.6%较为适宜；随着胶砂比降低，砂浆的力学性能下降；掺入2.5%胶粉的砂浆比空白组流动度提高了3.1%，抗折强度提高了8.5%，但过量的胶粉对砂浆性能产生消极影响；PP纤维对砂浆的工作性无明显影响，但随着其掺量增加，砂浆的抗压强度下降；消泡剂的掺入减小了砂浆的流动度，但掺量超过0.1%后几乎不再变化，而砂浆的力学性能随着其掺量的增加先上升后下降。 Abstract: To enhance the application of inorganic repair materials in the damage of concrete structures, the effects of sand type and particle size, superplasticizer dosage, binder sand ratio, latex powder and PP fiber, defoamer dosage on the basic performance of self-compacting rapid repair mortar were studied. The results show that the mortar made of quartz sand has higher compressive strength but lower toughness compared with river sand. From the performance and economy point of view, 1.6% dosage of superplasticizer is more suitable. The mechanical properties of the mortar decrease with the decrease of the binder sand ratio. 2.5% latex powder can improve 3.1% fluidity and 8.5% flexural strength of mortar, but too much latex powder will have a negative impact on the properties. PP fiber has no obvious effect on the workability of mortar, but with the increase of its content, the compressive strength shows a downward trend. The addition of defoamer reduces the fluidity of mortar, but it almost does not change when the content exceeds 0.1%. The mechanical strength first increases and then decreases with the increase of defoamer dosage.

郭超,李秋义,岳公冰.水泥基自密实修复砂浆的制备及性能研究[J].混凝土与水泥制品,2022(6):1-5. GUO C,LI Q Y,YUE G B.Research on Preparation and Properties of Cement-based Self-compacting Repair Mortar[J].China Concrete and Cement Products,2022(6):1-5.

摘   要：研究了减缩剂（SRA）掺量对超高性能混凝土（UHPC）抗压强度、抗折强度、自收缩和干燥收缩的影响。结果表明：随着减缩剂掺量的增加，UHPC的自收缩和干燥收缩显著降低，特别是早期自收缩减小效果更为明显，但同时会降低试件的抗压强度、抗折强度，且随着减缩剂掺量的增加，抗压强度不断降低。 Abstract: The effects of shrinkage reducing agent(SRA) dosage on compressive strength, flexural strength, self-shrinkage and drying shrinkage of UHPC were studied. The results show that with the increase of SRA, the self-shrinkage and drying shrinkage of UHPC are significantly reduced, especially for the early self-shrinkage reduction effect is more obvious, but at the same time the compressive strength and the flexural strength of the UHPC specimen are reduced, and with the increase of SRA, the compressive strength is continuously reduced.

刘菲凡.减缩剂对超高性能混凝土性能的影响研究[J].混凝土与水泥制品,2022(6):6-9,16. LIU F F.Effect of Shrinkage Reducing Admixture on the Properties of UHPC[J].China Concrete and Cement Products,2022(6):6-9,16.

摘   要：综述了掺微胶囊的水泥基复合材料自修复性能的研究成果，包括微胶囊的制备方法、微胶囊的自身性质、微胶囊对水泥基复合材料性能的影响、微胶囊修复水泥基复合材料的机理和修复效果，对比讨论了相关文献的试验结果，并展望了水泥基复合材料自修复性能研究的发展方向。 Abstract: The research results of self-healing properties of microcapsule cement-based composites are reviewed, including the preparation method of microcapsules, the properties of microcapsules, the effect of microcapsules on the properties of cement-based composites materials, mechanism and effect of microcapsules repairing cement-based composites materials. The experimental results of relevant literatures are compared and analyzed. In addition, the future research trend of self-healing properties of cement-based composites is summarized and discussed.

徐天辰,宋玉峰,欧阳利军,等.微胶囊对水泥基复合材料自修复性能的影响综述[J].混凝土与水泥制品,2022(6):10-16. XU T C,SONG Y F,OUYANG L J,et al.A Review of the Effect of Microcapsules on Self-healing Properties of Cement-based Composites[J].China Concrete and Cement Products,2022(6):10-16.

摘   要：以超细硅酸盐水泥和超细硫铝酸盐水泥为基准材料，以苯丙乳液和纳米SiO2为改性剂制备了一种混凝土桥梁底板裂缝快速修补胶浆，通过研究改性剂掺量对修补胶浆流动度和凝结时间的影响，确定了其最佳配合比，研究了苯丙乳液掺量对修补胶浆拉伸性能和强度的影响。结果表明：修补胶浆的最佳配合比为：m（超细水泥）∶m(水)∶m(纳米SiO2)∶ m(苯丙乳液)=100∶60∶2∶9；在此配合比下，该修补胶浆的初凝时间为56 min，终凝时间为64 min，初始流动度和 30 min 流动度分别为 250 mm和65 mm， 28 d抗压强度和抗折强度分别为19.4 MPa和6.1 MPa，折压比为31.4%，与裂缝壁的黏结强度为2.57 MPa；该修补胶浆施工性能、强度和韧性优良，与裂缝壁黏结性能良好，可确保裂缝修补后的使用耐久性。 Abstract: With ultrafine portland cement and ultrafine sulphoaluminate cement as the base materials, with styrene-acrylic emulsion and nano-SiO2 as modifiers, a kind of quick repair mortar for concrete bridge base crack was prepared. The optimal mix property of modifier was determined by studying the influence of modifier content on the fluidity and setting time of repair mortar. The effect of the content of styrene-acrylic emulsion on the tensile properties and strength of the repair mortar was systematically studied. The results show that the optimal mix proportion of repair mortar is: m(ultra-fine cement)∶m(water)∶m(nano-SiO2)∶m(styrene-acrylic emulsion)=100∶60∶2∶9. Under the optimal proportion, the initial setting time of the repair mortar is about 56 min, and the final setting time is 64 min, the initial fluidity and the fluidity after 30 minutes are 250 mm and 65 mm. The 28 d compressive strength and flexural strength are 19.4 MPa and 6.1 MPa respectively, and the flexural ratio is 31.4%, and the bond strength to the crack wall is 2.57 MPa. The repair mortar has excellent construction performance, strength and toughness, and has good bonding performance with the crack wall, which can ensure the durability after the crack is repaired.

姜克锦,陈辉强,尹强,等.混凝土裂缝快速修补胶浆的制备及性能研究[J].混凝土与水泥制品,2022(6):17-20,26. JIANG K J,CHEN H Q,YIN Q,et al.Study on Preparation and Properties of Quick Repair Mortar for Concrete Crack[J].China Concrete and Cement Products,2022(6):17-20,26.

摘   要：对冻融混凝土进行了不同单侧压下的劈拉试验，分析了冻融循环次数和单侧压对混凝土劈拉性能的影响，并结合声发射技术研究了混凝土在劈拉过程中的损伤发展，建立了混凝土损伤演化方程。结果表明：随着冻融循环次数的增加，混凝土冻融劣化程度加深，峰值应力明显降低；相同冻融循环次数下，单侧压越大，混凝土的峰值应力越大；经历冻融循环后的混凝土损伤发展速度加快，单侧压的存在对混凝土的损伤发展起到延阻作用；考虑冻融循环次数和单侧压作用的混凝土劈拉损伤演化曲线均可分为损伤初始发展阶段、损伤稳定发展阶段和损伤快速发展阶段。 Abstract: The split tensile test of freeze-thaw concrete under different unilateral compression was carried out. The influence of the number of freeze-thaw cycles and unilateral compression on the split tensile performance of concrete was analyzed, and the damage of concrete during the split tensile process was studied by acoustic emission technology． The concrete damage evolution formula was established． The results show that as the number of freeze-thaw cycles increases, the degree of freeze-thaw degradation of concrete deepens, and the peak stress decreases significantly. Under the same number of freeze-thaw cycles, the greater the unilateral pressure, the greater the peak stress of concrete. The development speed of concrete damage after the freeze-thaw cycles is accelerated, and the existence of unilateral pressure has an effect of extending resistance on concrete damage. The split tensile damage evolution curve of concrete considering the number of freeze-thaw cycles and unilateral pressure can be divided into initial damage development stage, stable damage development stage, and rapid damage development stage．

李文博,王乾峰,彭刚,等.单侧压对冻融混凝土劈拉损伤特性的影响[J].混凝土与水泥制品,2022(6):21-26. LI W B,WANG Q F,PENG G,et al.Influence of Unilateral Pressure on the Split Tensile Damage Characteristics of Freeze-thaw Deteriorated Concrete[J].China Concrete and Cement Products,2022(6):21-26.

基于Drucker-Prager准则对C30、C40再生混凝土动、静态荷载作用下的破坏机理与破坏形式进行了分析。结果表明：在静态荷载作用下，再生混凝土的破坏过程可分为四个阶段，主要表现为由脆性破坏向塑性破坏的转变；动态荷载对再生混凝土的动态抗压强度具有增强效应；在动态荷载作用下，再生混凝土主要表现为粉碎破坏，并随着冲击气压的增加，粉碎程度提高，再生混凝土的应力-应变曲线均呈先上升后下降的趋势，且上升段的斜率随冲击气压的增加而增大，而下降段的斜率相似，总体呈现从应变硬化发展为应变软化的现象。 Based on the Drucker-Prager criterion, the failure mechanism and failure form of C30 and C40 recycled concrete under dynamic and static loads were analyzed. The results show that under static loads, The failure process of recycled concrete can be divided into four stages, mainly manifested as the transition from brittle failure to plastic failure. Dynamic load has an enhancement effect on the dynamic compressive strength of recycled concrete. Under the action of dynamic load, the main performance of recycled concrete is crushing failure, and the crushing degree increases with the increase of impact air pressure. The stress-strain curves of recycled concrete all show a trend of rising first and then falling, and the slope of the ascending section increases with the increase of the impact air pressure, while the slope of the descending section is similar, and the phenomenon of developing from strain hardening to strain softening is generally exhibited.

赵江涛.基于Drucker-Prager准则的再生混凝土破坏研究[J].混凝土与水泥制品,2022(6):27-30,36. ZHAO J T.Study on Failure of Recycled Concrete Based on Drucker-Prager Criterion[J].China Concrete and Cement Products,2022(6):27-30,36.