摘   要：研究了不同冻融工况下黏附砂浆含量对高强再生透水混凝土抗冻耐久性的影响，并用SEM对其微观机理进行了分析。结果表明，300次冻融循环后，以相对动弹性模量不低于60%和抗压强度损失率不高于25%为失效准则，确定了再生粗骨料黏附砂浆的界限含量分别为41.19%和43.89%。在设计使用年限分别为100年、50年和30年的严寒地区高度饱水条件下，再生粗骨料最大黏附砂浆含量分别为33.00%、38.94%和40.27%。 Abstract: The influence of attached mortar content on the frost resistance of high strength recycled pervious concrete under different freeze-thaw conditions was studied, and the microscopic mechanism was analyzed by SEM. The results show that after 300 freezing-thawing cycles, taking the relative dynamic elastic modulus of not less than 60% and the loss rate of compressive strength not more than 25% as the failure criterion, the limit content of recycled coarse aggregate attached mortar is determined to be 41.19% and 43.89%, respectively. When the designed service life is 100 years, 50 years and 30 years respectively, the maximum attached mortar content of recycled coarse aggregate applied for structural concrete is 33.00%, 38.94% and 40.27%, respectively.

臧旭航,朱平华,王新杰,等.再生骨料黏附砂浆含量对人工成孔透水混凝土抗冻性的影响[J].混凝土与水泥制品,2021(1):80-84,99. ZANG X H,ZHU P H,WANG X J,et al.Effect of Recycled Aggregate Attached Mortar Content on Frost Resistance of Artificial Porous Pervious Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(1):80-84,99.

摘   要：为更好研究机制砂的合理应用，选取了3种不同岩性的机制砂，通过分级筛分后调配成Ⅱ区中砂，设计了三种不同级配的机制砂。研究了不同机制砂的化学组成、矿物组成和微观形貌，以及不同机制砂对胶砂性能的影响。研究表明：不同机制砂颗粒的长径比和圆形度有一定的差异，个别粒级的参数差异较大；级配对钙基机制砂胶砂强度影响没有硅基机制砂显著；细度模数较大时，钙基机制砂胶砂强度大于硅基机制砂。 Abstract: In order to study the reasonable application of machine-made sands, 3 kinds of machine-made sands with different lithology were selected and mixed into the middle sands of Area Ⅱ through classification and screening, and three different gradations of machine-made sands were prepared. The influence on the properties of mortar of the chemical composition, mineral composition, and micro-morphology of machine-made sands, different machine-made sands were analyzed. The results indicate that the slenderness ratio and roundness of different machine-made sands are different, and the parameters of individual grades are also different. The effect of gradation on the strength of silicon-based sands is more significant than that of calcium-based sands. When the fineness modulus is larger, the strength of calcium-based machine-made sand is higher than that of silicon-based machine-made sand.

孙星海,刘泽,王军伟,等.不同机制砂微观形貌和胶砂性能研究[J].混凝土与水泥制品,2021(1):85-89. SUN X H,LIU Z,WANG J W,et al.Study on Microstructure and Mortar Properties of Different Machine-made Sands[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(1):85-89.

摘   要：研究了不同粉煤灰掺量的碱矿渣-粉煤灰砂浆在20 ℃、200 ℃、400 ℃、600 ℃、800 ℃下力学性能的变化规律，并通过X射线衍射（XRD）、红外光谱（FTIR）和压汞法（MIP）分析了浆体的水化及孔结构。结果表明：掺粉煤灰可优化浆体的孔径分布，降低内部孔隙率，提高砂浆的耐高温性能，粉煤灰的适宜掺量为30%~50%；200 ℃时，掺30%粉煤灰砂浆的抗压强度最高，较20 ℃时提高了49.3%；600 ℃时，发生了固相反应，C-S-H凝胶减少，少害孔（20~50 nm）数量增加，砂浆保持了与20 ℃相当的抗压强度；800 ℃时，浆体生成大量钙黄长石，砂浆的抗压强度为20 ℃时的11.5%，基本失去工作性能。综合考虑，碱矿渣-粉煤灰砂浆的使用温度不宜超过600 ℃。 Abstract: The mechanical properties of alkali slag-fly ash mortar with different fly ash content at 20 ℃, 200 ℃, 400 ℃, 600 ℃, 800 ℃ were studied, and the hydration and pore structure were examined by using XRD, FTIR and MIP. The results show that adding fly ash can optimize the pore size distribution of the slurry, reduce the internal porosity, and improve the high-temperature resistance of the mortar, and the suitable blending amount is 30%~50%. At 200 ℃, the compressive strength of 30% fly ash mortar is the highest, which is 49.3% higher than that at 20 ℃. At 600 ℃, the mortar maintains the same compressive strength as 20 ℃, but the solid phase reaction occurs in the slurry, the number of less harmful pores (20~50 nm) increases and the C-S-H decreases. At 800 ℃, a large amount of calcium feldspar is formed in the slurry, and the compressive strength of the mortar is 11.5% of that at 20 ℃, which basically loses the working performance. Comprehensive consideration, the use temperature of alkali slag-fly ash mortar should not exceed 600 ℃.

高帅,吴岳峻,唐海涛,等.碱矿渣-粉煤灰砂浆的耐高温性能及孔结构研究[J].混凝土与水泥制品,2021(1):90-94. GAO S,WU Y J,TANG H T,et al. Study on High Temperature Resistance and Pore Structure of Alkali Slag-fly Ash Mortar[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(1):90-94.

贡鑫茹,李东,耿健.蒸养机制砂混凝土的毛细吸水特性[J].混凝土与水泥制品,2021(1):95-99. GONG X R,LI D,GENG J.Water Absorption of Steam Curing Machine-made Sand Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(1):95-99.

摘   要：分析了碳纤维网的密度、层数与预埋位置以及碳纤维短切丝的长度与掺量对混凝土梁抗折性能的影响。结果表明：预埋碳纤维网与掺入碳纤维短切丝均能显著提升混凝土梁的抗折性能；碳纤维网密度为20 mm×20 mm时，距混凝土梁上表面125 mm时的增强效果最佳；双层碳纤维网的增强效果明显优于单层碳纤维网；同时掺入碳纤维短切丝可继续提升混凝土梁的抗折性能，且掺量2%、长度6 mm的碳纤维短切丝提升效果最佳。 Abstract: The weakness of flexural and crack resistance has seriously affected the wide application of concrete in engineering. The influence of the density, the number of layers and the embedded position of carbon fiber mesh, and the length and content of carbon fiber short-cut wire on the flexural performance of concrete beams were analyzed. The results show that both the embedded carbon fiber mesh and the incorporation of carbon fiber short-cut wire can significantly improve the flexural performance of concrete beams. When the density of carbon fiber mesh is 20 mm× 20 mm, the reinforcement effect is the best when it is 125 mm away from the upper surface of the concrete beam. The reinforcement effect of adding double carbon fiber mesh is better than that of single layer. At the same time, adding carbon fiber short-cut wire can continue to improve the flexural performance of concrete beam, and 2% content of carbon fiber short-cut wire with the length of 6 mm is the best.

雷小磊,黄国栋,崔玉龙.碳纤维网与短切丝协同增强混凝土梁试验研究[J].混凝土与水泥制品,2021(1):61-66. LEI X L,HUANG G D,CUI Y L.Experimental Study on Reinforced Concrete Beam with Carbon Fiber Mesh and Short-cut Wire[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(1):61-66.

摘   要：为了研究钢板-超高性能混凝土（UHPC）组合梁的抗弯性能，在钢板-UHPC-T组合梁方案下，以钢板厚度、钢板强度等级、UHPC抗拉强度和UHPC极限拉应变为参数，利用ABAQUS软件进行了有限元分析。结果表明：钢板厚度和钢板强度等级的改变对组合梁抗弯承载力的提高作用较为明显；UHPC抗拉强度的提高可以适当提高开裂荷载；UHPC极限拉应变的增加可适当提高梁体的延性。 Abstract: In order to study the flexural performance of steel plate-ultra-high performance concrete(UHPC) composite beams, under the plan of steel plate-UHPC-T composite beams, the finite element analysis was carried out with ABAQUS finite element analysis software, taking steel plate thickness, steel plate strength grade, UHPC tensile strength and UHPC ultimate tensile strain as parameters. The results show that the change of steel plate thickness and steel plate strength grade have obvious effects on the improvement of the flexural bearing capacity of composite beams. The increase of UHPC tensile strength can appropriately increase the cracking load, and the increase of UHPC ultimate tensile strain can appropriately improve the ductility of the beam.

赵明,黄飞新,刘琼伟,等.钢板-超高性能混凝土梁有限元分析研究[J].混凝土与水泥制品,2021(1):67-71. ZHAO M,HUANG F X,LIU Q W,Finite Element Analysis of Steel Plate-ultra-high Performance Concrete Beams[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(1):67-71.