摘   要：研究了不同再生粗骨料掺量（30%、40%、50%）混凝土在不同损伤程度（S1、S2、S3）下的破坏形态、微观形貌和轴压应力-应变曲线，并对其损伤程度进行了定量分析。结果表明：再生粗骨料混凝土的初始损伤发生在试件角部，随后扩展、汇聚形成主裂缝；随着损伤程度的增加，混凝土试件中骨料与砂浆的界面过渡区裂缝增大；随着再生粗骨料掺量的增加，混凝土试件的裂缝数量基本增多，宽度基本增大，基体密实度有所降低，轴压应力-应变曲线的塑性阶段前移，下降段提前，试件延性变差；基于试验提出了再生粗骨料混凝土损伤评价准则的定量表达。 Abstract: The damage morphology, microstructure and axial compressive stress-strain curves of concrete with varying recycled coarse aggregate content(30%, 40%, 50%) under different damage degrees(S1, S2, S3) were investigated, and the damage degrees were quantitatively analyzed. The results show that, the initial damage of recycled coarse aggregate concrete occurs in the corner of the specimen, and then expands and converges to form the main crack. As the damage degree increases, the cracks in the interface transition zone between aggregate and mortar in the concrete specimen expand. With the increase of the recycled coarse aggregate content, the number of cracks in concrete specimens basically increases, the width basically expands, the matrix compactness decreases, the plastic phase of the axial compressive stress-strain curve shifts forward, the descending section advances, the ductility of specimen deteriorates. A quantitative expression of damage evaluation criteria for recycled coarse aggregate concrete is proposed based on the experiment.

彭胜,饶仕航,孙杰.再生混凝土的轴压损伤程度评估与定量分析[J].混凝土与水泥制品,2025(5):87-91. PENG S,RAO S H,SUN J.Evaluation and quantitative analysis of axial compression damage degree of recycled concrete[J].China Concrete and Cement Products,2025(5):87-91.

摘   要：对比研究了三种矿物掺合料（粉煤灰、铁尾矿粉、石灰石粉）对不同设计强度等级（M5、M10、M15）湿拌砂浆工作性、抗压强度、拉伸黏结强度、体积稳定性和抗氯离子渗透性能的影响。结果表明：随着时间的推移，砂浆的稠度不断降低；当砂浆的设计强度等级为M5时，三种矿物掺合料对其28 d、42 d抗压强度的贡献效果接近；当砂浆的设计强度等级为M10、M15时，掺合料对砂浆28 d、42 d抗压强度的贡献大小顺序为粉煤灰＞铁尾矿粉＞石灰石粉；对砂浆各龄期拉伸黏结强度的贡献大小顺序为粉煤灰＞铁尾矿粉＞石灰石粉；对干燥收缩值的贡献大小顺序为石灰石粉＞铁尾矿粉＞粉煤灰；对电通量的贡献大小顺序为石灰石粉＞粉煤灰＞铁尾矿粉。 Abstract: The effects of three types of mineral admixtures(fly ash, iron tailings powder, and limestone powder) on the workability, compressive strength, tensile bond strength, volume stability and chloride ion penetration resistance of wet-mixed mortar of various design strength grades(M5, M10, M15) were comparatively studied. The results show that, the consistency of the mortar decreases with time. When the design strength grade of mortar is M5, the contributions of the three types of mineral admixtures to the 28 d and 42 d compressive strength of mortar are close to each other. When the design strength grade of mortar is M10 and M15, the order of contribution of the admixtures to the 28 d and 42 d compressive strength of mortar is ranked as follows: fly ash ＞ iron tailings powder ＞ limestone powder. The order of contribution of the admixtures to the tensile bond strength of mortar at various ages is ranked as follows: fly ash ＞ iron tailings powder ＞ limestone powder. The order of contribution of the admixtures to drying shrinkage value is ranked as follows: limestone powder > iron tailings powder > fly ash, and the order of contribution of the admixtures to electrical flux is ranked as follows: limestone powder > fly ash > iron tailings powder.

张林啸,邰炜,宁长城,等.铁尾矿粉对湿拌砂浆性能的影响研究[J].混凝土与水泥制品,2025(5):92-95,105. ZHANG L X,TAI W,NING C C,et al.Study on the effect of iron tailings powder on the performance of wet-mixed mortar[J].China Concrete and Cement Products,2025(5):92-95,105.

摘   要：将隧道弃渣[全断面隧道掘进机（TBM）洞挖料、爆破开挖料]制成机制骨料，设计了C30、C35混凝土配合比，对比研究了不同设计强度等级TBM骨料混凝土和爆破骨料混凝土的力学及耐久性能。结果表明：在相同设计强度等级下，TBM骨料混凝土的力学、抗冻和干燥收缩性能基本低于爆破骨料混凝土；不同设计强度等级TBM骨料混凝土和爆破骨料混凝土的28 d抗压强度、28 d极限拉伸值、抗冻性能、抗渗性能均满足设计技术要求。 Abstract: The tunnel waste slag[tunnel boring machine(TBM) hole excavated materials, and blasting excavated materials] were made into manufactured aggregates, the mix proportions of C30 and C35 concrete were designed, and the mechanical properties and durability of TBM aggregate and blasting aggregate concrete of different design strength grades were studied comparatively. The results show that, under the same design strength grade, the mechanical properties, frost resistance and drying shrinkage properties of TBM aggregate concrete are basically lower than those of blasting aggregate concrete. The 28 d compressive strength, 28 d ultimate tensile value, frost resistance and impermeability of TBM aggregate concrete and blasting aggregate concrete of different design strength grades meet the design technical requirements.

殷康,贾伟珑,龚振如,等.隧道弃渣机制骨料混凝土的配合比设计及性能研究[J].混凝土与水泥制品,2025(5):96-100. YIN K,JIA W L,GONG Z R,et al.Mix proportion design and performance study of concrete with manufactured aggregate from tunnel waste slag[J].China Concrete and Cement Products,2025(5):96-100.

摘   要：对煤矸石机制砂进行裹浆改性处理，并研究了水泥-硅灰料浆的水胶比（0.6、0.8、1.0）、浸泡时长（2、3、4 h）对煤矸石机制砂压碎指标、吸水率、表观密度、微观结构及其砂浆力学性能的影响。结果表明：相较于未改性煤矸石机制砂，改性煤矸石机制砂的压碎指标降低，吸水率和表观密度均增大；改性煤矸石砂浆的28 d抗压强度、抗折强度较未改性煤矸石砂浆有所提高；当水泥-硅灰料浆水胶比为1.0、浸泡时长为2 h时，FS7组砂浆的28 d抗压强度和抗折强度均最高，分别为39.9 MPa和7.14 MPa；适当裹浆处理改善了砂浆界面过渡区的性能，提高了基体密实度，从而提高了砂浆的力学性能。 Abstract: Wrapping modification treatment was carried out on gangue manufactured sand, and the effects of water-binder ratio(0.6, 0.8, 1.0) of varying cement-silica fume slurry and soaking time(2, 3, 4 h) on the crushing index, water absorption rate, apparent density, microstructure of coal gangue manufactured sand and mechanical properties of its mortar were investigated. The results show that, compared to the unmodified coal gangue manufactured sand, the modified coal gangue manufactured sand exhibits a reduced crushing index, increased water absorption rate and higher apparent density. Furthermore, the 28 d compressive strength and flexural strength of mortar increase compared to the mortar with unmodified coal gangue manufactured sand. When the water-binder ratio of cement-silica fume slurry is 1.0, and the soaking time is 2 h, FS7 group mortar achieves the highest 28 d compressive strength and flexural strength of 39.9 MPa and 7.14 MPa, respectively. Appropriate wrapping treatment improves the performance of the interfacial transition zone of the mortar and the density of the matrix, thereby improving the mechanical properties of mortar.

陈子静,蔡海兵,李晓芳,等.裹浆处理对煤矸石机制砂及其砂浆性能的影响[J].混凝土与水泥制品,2025(5):101-105. CHEN Z J,CAI H B,LI X F,et al.Effect of wrapping treatment on the performance of coal gangue manufactured sand and its mortar[J].China Concrete and Cement Products,2025(5):101-105.

王卫,叶耀,袁继峰.再生骨料透水混凝土的抗压强度与透水性能研究[J].混凝土与水泥制品,2025(5):106-110. WANG W,YE Y,YUAN J F.Study on compressive strength and water permeability of pervious concrete with recycled aggregates[J].China Concrete and Cement Products,2025(5):106-110.

摘   要：研究了单掺或复掺偏高岭土和水晶废渣对氯氧镁水泥凝结时间、强度、表面泛霜性能、耐水性能和耐硫酸盐侵蚀性能的影响。结果表明：单掺或复掺偏高岭土和水晶废渣均延缓了氯氧镁水泥的凝结时间；适量掺入偏高岭土和水晶废渣能改善氯氧镁水泥的水化产物结构，提高基体密实度，从而提高试件的强度、抗泛霜性能、耐水性能和耐硫酸盐侵蚀性能。 Abstract: The effects of individual and combined additions of metakaolin and crystal waste residue on the setting time, strength, surface frost performence, water resistance, and sulfate corrosion resistance of magnesium oxychloride cement were studied. The results show that both the individual and combined additions of metakaolin and crystal waste prolong the setting time of magnesium oxychloride cement. An appropriate content of metakaolin and crystal waste residue can improve the hydration product structure of magnesium oxychloride cement, increase the compactness of the matrix, thereby enhancing the strength, frost resistance, water resistance, and sulfate corrosion resistance of the specimens.

孔贇,田焜,王月兰,等.偏高岭土与水晶废渣复合改性氯氧镁水泥的性能研究[J].混凝土与水泥制品,2025(5):111-114. KONG Y,TIAN K,WANG Y L,et al.Study on properties of magnesium oxychloride cement modified by metakaolin and crystal waste residue[J].China Concrete and Cement Products,2025(5):111-114.