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发布时间:2020-01-06 00:00:00
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2021

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
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
  • 臧旭航1,朱平华1,王新杰1,陈春红1,刘 惠1,许 鸣2
2021年第1期
摘要
引用本文
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.
不同机制砂微观形貌和胶砂性能研究
不同机制砂微观形貌和胶砂性能研究
  • 孙星海1,刘 泽1,王军伟2,姜启衎1
2021年第1期
摘要
引用本文
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.
碱矿渣-粉煤灰砂浆的耐高温性能及孔结构研究
碱矿渣-粉煤灰砂浆的耐高温性能及孔结构研究
  • 高 帅1,吴岳峻2,唐海涛3,汪峻峰2,4,鲁刘磊3
2021年第1期
摘要
引用本文
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.
蒸养机制砂混凝土的毛细吸水特性
蒸养机制砂混凝土的毛细吸水特性
  • 贡鑫茹1,2,3,李 东1,耿 健2,3
2021年第1期
摘要
引用本文
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.
碳纤维网与短切丝协同增强混凝土梁试验研究
碳纤维网与短切丝协同增强混凝土梁试验研究
  • 雷小磊,黄国栋,崔玉龙
2021年第1期
摘要
引用本文
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.
钢板-超高性能混凝土梁有限元分析研究
钢板-超高性能混凝土梁有限元分析研究
  • 赵 明1,黄飞新1,刘琼伟2,邱明红2,黄 政2,胡伟业2,邵旭东2
2021年第1期
摘要
引用本文
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.
装配式大板结构老旧住宅楼的修复加固研究
装配式大板结构老旧住宅楼的修复加固研究
  • 厉见芬1,李书进1,肖耀军2
2021年第1期
摘要
引用本文
摘   要:以常州市某老旧小区的28栋装配式大板结构住宅楼为例,在原结构存在缺陷和工程造价、施工工期、对住户的影响等多重技术难题条件下,基于房屋渗漏现状和检测报告,进行了原因分析,提出了合理的修复加固方案。研究成果对类似老旧小区的综合性能提升和改造关键技术有一定的参考价值。 Abstract: Taking 28 residential buildings with prefabricated large panel structure in an old residential in Changzhou as an example, and considering multiple technical problems such as defects of original structure, project cost, construction period and impact on households, based on housing leakage status and inspection report, the causes are analyzed, and reasonable restoration and reinforcement program is put forward. The research results have a certain reference value for the improvement of comprehensive performance and the key technology of transformation in similar old residential areas.
厉见芬,李书进,肖耀军.装配式大板结构老旧住宅楼的修复加固研究[J].混凝土与水泥制品,2021(1):72-74,79. LI J F,LI S J,XIAO Y J.Research on Restoration and Reinforcement of Old Residential Buildings with Prefabricated Large Panel Structure[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(1):72-74,79.
可再分散乳胶粉及玻化微珠对泡沫混凝土性能的影响
可再分散乳胶粉及玻化微珠对泡沫混凝土性能的影响
  • 马建斌
2021年第1期
摘要
引用本文
摘   要:泡沫混凝土(FC)作为一种轻质多孔材料具有优良的保温隔热效果,将其用作建筑保温墙体材料可以有效降低建筑能耗。利用可再分散乳胶粉(RDL)和玻化微珠(GB)改性FC,研究了RDL和GB单独取代以及RDL和GB共同取代快硬硫铝酸盐水泥对FC干密度、抗压强度、导热系数和拉伸黏结强度的影响。结果表明:RDL可以显著提高FC的拉伸黏结强度,GB可以显著降低FC的干密度和导热系数;RDL和GB共同取代水泥时更有利于改善FC的综合性能;RDL和GB总掺量为3%时改善效果最佳, 此时FC的干密度为311.7 kg/m3,抗压强度为0.42 MPa,导热系数为0.078 3 W/(m·K),拉伸黏结强度为0.113 9 MPa。 Abstract: As a kind of lightweight porous material, foam concrete(FC) has excellent thermal insulation effect and can be used as building insulation wall material to effectively reduce building energy consumption. Using redispersible latex powder(RDL) and glass beads(GB) to modify FC, and the effect of RDL and GB alone substitution and RDL and GB joint substitution of rapid hardening sulphoaluminate cement on the dry density, compressive strength, thermal conductivity and tensile bond strength of FC were explored. The results show that RDL can significantly improve tensile bond strength of FC, and GB can significantly reduce dry density and thermal conductivity of FC. When RDL and GB replace cement together, it is more conducive to improve the comprehensive performance of FC. The improvement effect is best when the total content of RDL and GB is 3%. At this time, the dry density, compressive strength, thermal conductivity and tensile bond strength of FC are 311.7 kg/m3, 0.42 MPa, 0.078 3 W/(m·K), and 0.113 9 MPa, respectively.
马建斌.可再分散乳胶粉及玻化微珠对泡沫混凝土性能的影响[J].混凝土与水泥制品,2021(1):75-79. MA J B.Influence of Redispersible Latex Powder and Glass Beads on the Properties of Foam Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(1):75-79.
海水冻融侵蚀下PVA-纳米SiO2混凝土性能试验研究
海水冻融侵蚀下PVA-纳米SiO2混凝土性能试验研究
  • 孔令康1,2,孙 敏1,2
2021年第1期
摘要
引用本文
摘   要:采用快冻法研究了海水冻融环境下PVA纤维和纳米SiO2对混凝土抗冻性能的影响。结果表明:每25次冻融循环结束后,不同类型混凝土的相对动弹性模量和抗压强度剩余比都有不同程度的下降;PVA纤维和纳米SiO2均能提升混凝土的抗冻性能;单掺PVA纤维或纳米SiO2试验组的抗冻性普遍低于PVA-纳米SiO2混掺试验组;混掺0.1% PVA纤维和1.0%纳米SiO2试验组的抗冻性最好。 Abstract: The effect of PVA fiber and nano-SiO2 on the frost resistance of concrete under the seawater freeze-thaw erosion was studied by the rapid freezing method. The results show that after every 25 freeze-thaw cycles, the relative dynamic elastic modulus and compressive strength residual ratio of various types of concrete decrease to varying degrees. Both PVA fiber and nano-SiO2 can improve the frost resistance of concrete. The frost resistance of the PVA fiber or nano-SiO2 test group is generally lower than that of the PVA-nano-SiO2 mixed test group. The frost resistance of the test group mixed with 0.1% PVA fiber and 1.0% nano-SiO2 is the best.
孔令康,孙敏.海水冻融侵蚀下PVA-纳米SiO2混凝土性能试验研究[J].混凝土与水泥制品,2021(1):50-53. KONG L K,SUN M.Experimental Study on the Performance of PVA-nano-SiO2 Concrete Under the Seawater Freeze-thaw Erosion[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(1):50-53.
竹叶纤维混凝土工作性和力学性能试验研究
竹叶纤维混凝土工作性和力学性能试验研究
  • 王贵忠
2021年第1期
摘要
引用本文
摘   要:研究了不同掺量(0、0.3%、0.5%、0.7%、0.9%和1.1%)的竹叶纤维对混凝土工作性和力学性能的影响。结果表明:随着竹叶纤维掺量的增加,混凝土的坍落度逐渐降低;混凝土吸水率随着竹叶纤维掺量增加而增加;竹叶纤维的掺入对混凝土抗压强度不利,但有利于提高混凝土的劈裂抗拉强度和抗折强度;综合考虑各种因素,建议竹叶纤维的最佳掺量取0.7%。 Abstract: The effects of bamboo leaf fiber with different content(0, 0.3%, 0.5%, 0.7%, 0.9% and 1.1%) on the workability and mechanical properties of concrete were studied. The results show that with the increase of bamboo leaf fiber content, the slump of concrete gradually decreases. The water absorption rate of concrete increases with the increase of bamboo leaf fiber content. The incorporation of bamboo leaf fiber is unfavorable to the compressive strength of concrete, but it can improve the splitting tensile strength and flexural strength of concrete. Considering various factors, it is recommended that the optimal content of bamboo leaf fiber is 0.7%.
王贵忠.竹叶纤维混凝土工作性和力学性能试验研究[J].混凝土与水泥制品,2021(1):54-56. WANG G Z.Experimental Research on Workability and Mechanical Properties of Bamboo Leaf Fiber Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(1):54-56.
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