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发布时间:2020-01-06 00:00:00
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复合矿粉再生骨料CFG桩桩身材料强度试验研究
复合矿粉再生骨料CFG桩桩身材料强度试验研究
  • 陈 辉1,高 强2,陈 甦1,孙 飞2,钱林根1
2020年1期
摘要
引用本文
摘要:研究了复合矿粉(矿粉+粉煤灰)再生骨料CFG桩桩身材料强度随矿粉替代粉煤灰百分比和养护龄期的变化规律;通过正交试验设计,分析了复合矿粉再生骨料CFG桩桩身材料强度的影响因素,并对正交试验结果进行数值拟合,提出了强度预测公式。研究结果表明,复合矿粉再生骨料CFG桩桩身材料强度随矿粉替代粉煤灰百分比的增加而增加,但当矿粉替代粉煤灰百分比大于50%时,强度增长速率开始减小;复合矿粉再生骨料桩桩身材料强度随龄期增加而增大;影响复合矿粉CFG桩桩身材料强度的因素顺序依次为:龄期>矿粉取代粉煤灰>矿粉取代水泥,最优组合为矿粉取代粉煤灰100%、矿粉取代水泥0、龄期90 d;桩身材料强度预测公式精度较高。
Abstract: Through mixture ratio test of CFG pile with composite mineral powder (mineral powder + fly ash) recycled aggregate, the change rules of material strength under different replacement percentage of fly ash with mineral powder and various curing age were studied, and the influencing factors of material strength of CFG pile with composite mineral powder recycled aggregate was analyzed by orthogonal test, and the material strength prediction formula was proposed by mathematical fitting. The results show that the strength of composite mineral powder recycled aggregate pile increases with the increase of the percentage of fly ash replaced by mineral powder, but when the replacement percentage is greater than 50%, the growth rate of strength begins to decrease. The strength of composite mineral powder recycled aggregate pile increases with the increase of curing age. The importance ranking of factors affecting the strength of CFG pile material is: curing age > replacement percentage of fly ash with mineral powder > replacement percentage of cement with mineral powder, and the optimal combination is 100% fly ash replaced by mineral powder, 0% cement replaced by mineral powder, and 90 days curing age. The prediction formula of material strength has high accuracy
陈辉,高强,陈甦,等.复合矿粉再生骨料CFG桩桩身材料强度试验研究[J].混凝土与水泥制品,2020(1):97-100.
CHEN H,GAO Q,CHEN S,et al.Experimental Study on the Strength of Materials of Composite Mineral Powder Recycled Aggregate CFG Piles[J].China Concrete and Cement Products,2020(1):97-100.
铁尾矿砂混凝土与HRB500钢筋锚固性能试验研究
铁尾矿砂混凝土与HRB500钢筋锚固性能试验研究
  • 康洪震1,2,王 宇2,李 强1,3
2020年1期
摘要
引用本文
摘要:为研究HRB500高强钢筋在铁尾矿砂混凝土中的锚固性能,通过两类共27个不同锚固类型试件的直接拉拔试验方法,分析了不同锚固形式钢筋的受力特征,研究了铁尾矿砂混凝土强度、保护层厚度和锚固长度等因素对锚固性能的影响。结果表明,随着混凝土强度、保护层厚度和锚固长度的增加,锚固强度逐渐增大,且呈一定的线性关系,并在保护层厚度和锚固长度方面存在限值。同时,与GB 50010—2010《混凝土结构设计规范》中的锚固长度进行对比,提出了HRB500钢筋在铁尾矿砂混凝土中锚固长度设计建议。
Abstract: In order to study the anchorage performance of HRB500 high-strength steel bar in iron tailings sand concrete, the mechanical characteristics of different anchorage forms of steel bar were analyzed by direct pull-out test of 27 specimens of different anchorage types, and the effects of strength of iron tailings sand concrete, thickness of protective layer and anchorage length on anchorage performance were studied. The results show that with the increase of concrete strength, protective layer thickness and anchorage length, anchorage strength increases gradually and has a certain linear relationship, and there are limits in protective layer thickness and anchorage length. At the same time, compared with the anchorage length in GB 50010—2010 The Code Design of Concrete Structures, the design proposal of anchorage length of HRB500 steel bar in iron tailings sand concrete is put forward.
康洪震,王宇,李强.铁尾矿砂混凝土与HRB500钢筋锚固性能试验研究[J].混凝土与水泥制品,2020(1):92-96. KANG H Z,WANG Y,LI Q.Experimental Study on Anchorage Performance of Iron Tailings Sand Concrete and HRB500 Steel Bar[J].China Concrete and Cement Products,2020(1):92-96.
河道疏浚底泥制备泡沫混凝土试验研究
河道疏浚底泥制备泡沫混凝土试验研究
  • 杨小云1,赵 玲1,2;陈 兵3,仁 增1,张 颖2,李德平2,申哲民1
2020年1期
摘要
引用本文
摘要:利用河道疏浚底泥制备泡沫混凝土,研究了石灰、粉煤灰和微硅粉部分代替水泥,以及外掺偏硅酸钠、水玻璃和生物炭对所制备的底泥基泡沫混凝土抗压强度、导热系数和吸水耐水性能的影响。结果表明,微硅粉的加入优化了孔隙分布,可诱发火山灰反应,改善底泥基泡沫混凝土的综合性能;外掺2%的大麦草生物炭(500 ℃)可使底泥基泡沫混凝土的抗压强度提高14.2%,导热系数降低4.78%;添加石灰、粉煤灰和偏硅酸钠降低了泡沫混凝土的综合性能;水玻璃对泡沫混凝土的性能影响不大。
Abstract: Dredged sediment was used to produce foamed concrete, and the effects of partial replacement of cement by lime, fly ash and silica fume, and doping sodium metasilicate, water glass and biochar on the compressive strength, thermal conductivity and water absorption of the foamed concrete were studied. The results show that the addition of silica fume optimizes the pore distribution, induce the pozzolanic reaction, which can improve the comprehensive properties of the sediment foamed concrete. Dosage of 2% barley grass biochar (500 ℃) can increase the compressive strength of the sediment foamed concrete by 14.2% and reduce the thermal conductivity by 4.78%. The addition of lime, fly ash and sodium metasilicate reduce the comprehensive properties of foam concrete, and water glass has little effect on the properties of foam concrete.
杨小云,赵玲,陈兵,等.河道疏浚底泥制备泡沫混凝土试验研究[J].混凝土与水泥制品,2020(1):86-91.
YANG X Y,ZHAO L,CHEN B,et al.Experiment Study on Preparation of Foamed Concrete with Dredged River Sediment[J].China Concrete and Cement Products,2020(1):86-91.
基于装配式建筑中拆分设计的控制条件研究
基于装配式建筑中拆分设计的控制条件研究
  • 邹 灵,易 郴,吴 彦
2020年1期
摘要
引用本文
摘要:从影响预制构件拆分的设计、生产、运输、施工等限制条件入手,全面分析了装配式建筑的拆分设计要点,提出了装配式建筑设计的基本要求。
Abstract: Starting with the restrictions on the design, production, transportation and construction of the precast component splitting, the main points of the splitting design of the assembly building are comprehensively analyzed, and the basic requirements of the assembly building design are put forward.
邹灵,易郴,吴彦.基于装配式建筑中拆分设计的控制条件研究[J].混凝土与水泥制品,2020(1):83-85.
ZOU L, YI C, WU Y.Research on Control Conditions of Split Design Based on Assembly Buildings[J].China Concrete and Cement Products,2020(1):83-85.
T/CBMF 64—2019《预应力高强混凝土管桩免压蒸生产技术要求》标准解读
T/CBMF 64—2019《预应力高强混凝土管桩免压蒸生产技术要求》标准解读
  • 蒋元海,刘红飞,熊厚仁,陈 海
2020年1期
摘要
引用本文
摘要:为了便于标准使用各方准确贯彻实施标准的具体要求和规定,简述了中国建筑材料联合会团体标准T/CBMF 64—2019《预应力高强混凝土管桩免压蒸生产技术要求》的编制背景、编制目的和意义,详细说明了标准条文的具体内容,提出了实施过程中应注意的问题。
Abstract: In order to carry out and implement the specifications of the standard, the background, purpose and significance of the T/CBMF 64—2019 Technical Requirements for the No-autoclave Curing Production Process of Prestressed High Strength Concrete Pipe are introduced briefly by the China Building Materials Federation, and the specific contents of the standard provisions is described in detail, and the problems that should be paid attention to in the implementation process are put forwoard.
蒋元海,刘红飞,熊厚仁,等.T/CBMF 64—2019《预应力高强混凝土管桩免压蒸生产技术要求》标准解读[J].混凝土与水泥制品,2020(1):78-82.
JIANG Y H,LIU H F,XIONG H R,et al.Introduction of T/CBMF 64-2019 Technical Requirements for the No-autoclave Curing Production Process of Prestressed High Strength Concrete Pipe[J].China Concrete and Cement Products,2020(1):78-82.
冲击荷载作用下钢筋混凝土梁力学特性
冲击荷载作用下钢筋混凝土梁力学特性
  • 葛文慧
2020年1期   No.285   P73-77+91
摘要
引用本文
摘要:为研究RC梁在冲击荷载作用下的力学特性,以混凝土强度、纵筋与箍筋配筋率、冲击体的冲击速度以及RC梁的跨度为主要参数对RC梁在冲击作用下的力学性能进行了数值分析,通过与已有试验结果对数值模型进行标定,获取了冲击力时程曲线、位移时程曲线以及破坏形态,验证了数值结果的正确性。分析结果表明,混凝土强度主要影响RC梁的破坏形态;纵筋配筋率对RC梁跨中位移影响较大;冲击体速度会同时对RC梁的破坏区域和跨中位移产生影响;RC梁跨度不仅会改变梁跨中位移也会改变梁的振动频率与反弹速度。
Abstract: In order to study the mechanical properties of RC beams subjected to impact loads, the mechanical properties of RC beams subjected to impact loads were numerically analyzed by taking concrete strength, ratio of longitudinal reinforcement to stirrup reinforcement, impact velocity of impact body and span of RC beams as main parameters. The numerical models were calibrated with the existing experimental results, and the impact force time history curve, displacement time history curve and breakage were obtained, and the correctness of the numerical results was verified. The results show that the concrete strength mainly affects the failure mode of RC beams. The reinforcement ratio of longitudinal bars has a great influence on the mid-span displacement of RC beams. The impact velocity also affect the damage area and mid-span displacement of RC beams. The span of RC beams can not only change the mid-span displacement of beams, but also change the vibration frequency and rebound speed of beams.
葛文慧.冲击荷载作用下钢筋混凝土梁力学特性数值研究[J].混凝土与水泥制品,2020(1):73-77+91.
GE W H.Numerical Study on Mechanical Properties of Reinforced Concrete Beams under Impact Loads[J].China Concrete and Cement Products,2020(1):73-77+91.
铝酸盐水泥基砂浆抗分散性研究
铝酸盐水泥基砂浆抗分散性研究
  • 高礼雄,崔 皓
2020年1期   No.285   P69-72
摘要
引用本文
摘要:选用m(铝酸盐水泥)∶m(普通硅酸盐水泥)∶m(水石膏)= 85%∶4%∶11%的三元胶凝体系,通过控制凝结时间制备出了自流平水下抗分散铝酸盐水泥基砂浆。通过测试其水陆强度、pH值、浊度并结合SEM微观分析,探究了铝酸盐水泥基砂浆抗分散性。结果表明,通过酒石酸和葡萄糖酸钠双掺解决了铝酸盐水泥基砂浆流动度损失大的问题。再生乳胶掺量增加优化了砂浆的抗分散能力。通过模拟水下现场浇筑,发现水下成型的铝酸盐水泥基砂浆试件的28 d抗压强度均在70 MPa以上,形成了控制凝结时间的水下成型制备技术。SEM揭示控制凝结时间的浇筑技术,水下成型的铝酸盐水泥砂浆试件内部密实、孔隙率低。
Abstract: A ternary cementing system of m(aluminate cement)∶m(ordinary portland cement)∶m(water gypsum) = 85%∶4%∶11% was used to control the setting time to produce a self-leveling water dispersion resistant aluminate cement-based mortar. The anti-dispersibility of aluminate cement-based mortar was explored by testing its water and land strength, pH value, turbidity and SEM microanalysis. The results show that the problem of large fluidity loss of aluminate cement-based mortar is solved by double mixing of tartaric acid and sodium gluconate. Increasing the amount of recycled latex optimizes anti-dispersion ability of the mortar. By simulating underwater in-situ pouring, the aluminate cement-based mortar specimens molded under water at 28 days has a compressive strength of more than 70 MPa, forming an underwater molding preparation technology to control the setting time. SEM reveals the pouring technology that controls the setting time, and the aluminate cement mortar specimens formed underwater are compact and have low porosity.
高礼雄,崔皓.铝酸盐水泥基砂浆抗分散性研究[J].混凝土与水泥制品,2020(1):69-72.
GAO L X,CUI H.Study on Anti-dispersion of Aluminate Cement Based Mortar[J].China Concrete and Cement Products,2020(1):69-72.
装配式建筑预制轻质保温墙体系统设计与性能研究
装配式建筑预制轻质保温墙体系统设计与性能研究
  • 於林锋,管 文,樊俊江
2020年1期   No.285   P65-68+72
摘要
引用本文
摘要:以轻骨料混凝土技术为基础,开展装配式建筑预制轻质保温墙体系统设计,并对保温墙体系统性能进行了综合测试分析。研究结果表明:与相同强度等级的普通混凝土相比,轻骨料混凝土保温墙体的防水性能不及普通混凝土,其与FRP拉接件的抗拉拔承载力和抗剪承载力分别降低了12%和13%,系统自重减轻了23%;设计了由轻骨料混凝土内叶墙板100 mm、XPS保温板40 mm、轻骨料混凝土外叶墙板55 mm和面砖饰面层组成的预制轻骨料混凝土夹心保温外挂墙板系统,可满足65%的建筑节能设计要求和防水要求。
Abstract: Based on the technology of lightweight aggregate concrete, the design of precast lightweight thermal insulation wall system for prefabricated buildings was carried out, and the performance of thermal insulation wall system was comprehensively tested and analyzed. The results show that the waterproofing performance of lightweight aggregate concrete insulation wall is inferior to that of ordinary concrete in the same strength grade. The pull-out and shear bearing capacity of lightweight aggregate concrete insulation wall and its FRP connectors are reduced by 12% and 13%, respectively, and the weight of the system can be reduced by 23%. The design of lightweight aggregate concrete inner-leaf wall board is 100 mm, XPS insulation board is 40 mm, and lightweight aggregate concrete outer-leaf wall board is 55 mm. The prefabricated lightweight aggregate concrete sandwich thermal insulation external wall panel system composed of face brick decoration layer can meet 65% of the building energy saving design requirements and waterproof requirements.
於林锋,管文,樊俊江.装配式建筑预制轻质保温墙体系统设计与性能研究[J].混凝土与水泥制品,2020(1):65-68+72.
YU L F,GUAN W,FAN J J.Design and Research on Precast Lightweight Insulation Wall System of Prefabricated Buildings[J].China Concrete and Cement Products,2020(1):65-68+72.
装配式混凝土框架柱连接节点研究进展
装配式混凝土框架柱连接节点研究进展
  • 姚 兵1,朱张峰1,刘德源1,2,杜 咏1
2020年1期   No.285   P59-64
摘要
引用本文
摘要:装配式混凝土结构由于质量可靠、生产效率高、抗震性能好,近年来在国内得到快速发展。框架柱作为框架结构的重要受力构件,预制柱之间的连接节点则更是其关键部位,节点连接的受力可靠性将决定整体结构的抗震能力,节点连接的构造合理性将影响施工效率与质量。结合近年来国内外装配式混凝土框架柱连接节点领域的发展概况,从试验研究与数值模拟两方面进行总结,并分析了仍然存在的问题及未来发展方向,为我国装配式混凝土框架结构的发展提供参考。
Abstract: The prefabricated concrete structure developed rapidly in China in recent years due to its reliable quality, high production efficiency and good seismic performance. As the important force-bearing member of the frame structure, the frame column is the key part of the prefabricated column. The reliability of the joint connection will determine the seismic capacity of the whole structure. The structural rationality of the joint connection can affect the construction efficiency and quality. Combining with the development situation of fabricated concrete frame column connection joints at home and abroad in recent years, the experimental research and numerical simulation are summarized, and the existing problems and future development direction are analysed, which can provide a reference for the development of fabricated concrete frame structures in China.
尤志国,王璐,刘佳星.多尺寸纤维透水混凝土性能试验研究[J].混凝土与水泥制品,2020(1):55-58.
YOU Z G,WANG L,LIU J X.Experimental Study on the Performance of Multi Size Fiber Permeable Concrete [J].China Concrete and Cement Products,2020(1):55-58.
多尺寸纤维透水混凝土性能试验研究
多尺寸纤维透水混凝土性能试验研究
  • 尤志国1,2,王 璐1,2,刘佳星1,2
2020年1期   No.285   P55-58
摘要
引用本文
摘要:采用尺寸分别为6mm、12mm、20mm的玄武岩纤维和聚丙烯纤维对粗骨料粒径为5~10mm和10~20mm的透水混凝土的透水系数、孔隙率、抗压强度、抗折强度以及冻融耐久性变化规律进行了分析,并与普通透水混凝土进行了对比。结果表明,纤维的掺入以及纤维尺寸的递增能够提升透水混凝土的力学性能和冻融耐久性;透水混凝土的透水性能、力学性能和冻融耐久性均随着骨料粒径的增大而增加;玄武岩纤维在增强透水混凝土性能方面优于聚丙烯纤维;尺寸为12mm的玄武岩纤维和粒径为10~20mm的骨料更适用于改善透水混凝土的性能。 Abstract: Basaltfiberandpolypropylenefiberwithdimensionsof6mm,12mmand20mmwereusedtoanalyzethepermeabilitycoefficient,porosity,compressivestrength,bendingstrengthandfreeze-thawdurabilityofperviousconcretewithcoarseaggregatesizeof5~10mmand10~20mm,andcomparedwithordinaryperviousconcrete.Theresultsshowthattheadditionoffibersandtheincreaseoffibersizecanimprovethemechanicalpropertiesandfreeze-thawdurabilityofperviousconcrete.Withtheincreaseofaggregatesize,thewaterpermeability,mechanicalpropertiesandfreeze-thawdurabilityoftheconcreteareincreased.Basaltfiberissuperiortopolypropylenefiberinenhancingtheperformanceofperviousconcrete.Basaltfiberwiththesizeof12mmandcoarseaggregatewithparticlesizeof10~20mmaremoresuitableforimprovingtheperformanceofperviousconcrete.
尤志国,王璐,刘佳星.多尺寸纤维透水混凝土性能试验研究[J].混凝土与水泥制品,2020(1):55-58.
YOU Z G,WANG L,LIU J X.Experimental Study on the Performance of Multi Size Fiber Permeable Concrete [J].China Concrete and Cement Products,2020(1):55-58.
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