第三期_2016_《混凝土与水泥制品》杂志社

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发布时间：2020-01-06 00:00:00

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第三期

锂渣超细粉作混凝土用矿物外加剂的试验研究

黄阳，王瑜，王维清，杨群，冯启明，徐中慧，颜翠平

２０16年第3期

摘要

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摘要：利用气流粉碎机将锂渣加工成三种不同细度的超细粉，研究了锂渣超细粉的粒度分布、活性指数、掺量、水化热等技术指标。结果表明，平均粒径分布为5.55μm、4.32μm和2.96μm的三种锂渣超细粉的比表面积分别达到9.39m2/g、11.81m2/g和13.80m2/g，28d活性指数分别达到102.8%、104%和107%，但3d和7d的活性指数低于90%，这说明锂渣超细粉活性较高，但水化反应速率较慢。掺入锂渣超细粉的水泥水化热显著降低，超细加工有利于提升锂渣的性能。Abstract:Lithiumslagisprocessedintothreekindsofultrafinepowdersbyairflowsplinteredmachine.Thetechnologyindexasparticlesizedistribution,dosage,activityindexandhydrationheatofultrafinelithiumslagareinvestigated.Theresultsshowthat,theaverageparticlesizeofthreekindsofultrafinelithiumslagis5.55μm,4.32μmand2.96μm,andspecificsurfaceareais9.39m2/g、11.81m2/gand13.80m2/g,respectively.The28-dayactivityindexis102.8%,104%and107%,respectively.However,3-dayactivityindexand7-dayactivityindexarelowerthan90%whichindicatestheactivityoftheultrafinelithiumslagishighandthereactionrateisslow.Atthesametime,thehydrationheatofthecementmixedwithultrafinelithiumslagissignificantlydecreased.Obviously,ultra-fineprocessingisbeneficialtoimprovetheperformanceoflithiumslag.

磷渣-磷尾矿制备硅酸钙板的研究

梁兴荣1,2，薛俊2，曹宏2

２０16年第3期

摘要

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摘要：通过对比不同粒度磷渣作为胶凝材料的火山灰活性、磷尾矿作为惰性填料和将磷尾矿处理后物料制备硅酸钙板制品，结果表明，S95级磷渣28d火山灰活性指数>90%；磷尾矿作为惰性填料制备出的制品抗折强度<6MPa且尾矿的掺量<10%；磷尾矿处理后物料制备出制品抗折强度>9MPa且配比中废弃物的掺量>40%，制品抗折强度随着保温时间延长逐渐降低，最佳保温时间为6h。 Abstract: Preparation calcium silicate board by using solid waste from phosphorus chemical industry, the volcanic activity of different particle size of phosphorus slag as cementitious material is compared, phosphorus tailings as inert fillers and calcium silicate board is prepared by materials after phosphorus tailings had processed. The results show that, level S95 phosphorus slag of 28d volcanic activity index is more than 90%; flexural strength of the product which is prepared by phosphorus tailings as inert filler is less than 6MPa and the tailings content is less than 10%; flexural strength of the product which is prepared after phosphorus tailings had processed is more than 9MPa and the tailings content is more than 40%, the flexural strength of the products is gradually decreased with the prolonging of holding time, the optimal holding time is 6h.

隧道衬砌混凝土覆膜自动控制蒸汽养护施工技术

石迎新

２０16年第3期

摘要

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摘要：近年来在隧道二衬混凝土的回弹检测中，时有因养护不到位而影响混凝土质量，或因养护方法不当导致二衬混凝土表面开裂等情况的出现。针对此情况，固西公路炸嘴山隧道研发了蒸汽覆模养护技术，系统主要由养护罩、蒸汽系统和控制系统三部分组成，实现了对隧道衬砌混凝土采取蒸汽高温养护和标准养护两个阶段，取得了很好的效果。 Abstract: In springback inspection for tunnel lining concrete in recent years, the situation of tunnel lining concrete surface cracking is produced by not reaching curing or improper curing method. Aiming this situation, steam mulching model curing technology is researched in Guxi highway Zhazui mountain tunnel, that system mainly consists three parts of curing cover, steam system and control system, two stages that contains steam high temperature and standard curing are reached for tunnel lining concrete, which can achieve good effects.

U形混凝土板桩振动沉桩工艺研究

朱建舟1，张后禅2

２０16年第3期

摘要

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摘要：介绍了U形混凝土板桩振动沉桩工艺原理、特点及振动沉桩阻力计算和振动锤的设备选型计算，并对U形混凝土板桩的沉桩施工工艺及流程进行了阐述，提出了U形混凝土板桩振动沉桩的几种施工顺序组织方法。 Abstract: Technology principle, characteristic of U-shaped concrete sheet vibratory sinking pile, the sinking resistance calculation of vibratory sinking pile and equipment selection calculation of vibratory hammer are introduced, sinking construction process and construction process of U-shaped concrete sheet sinking pile are elaborated. Several kinds of construction organization method of U-shaped concrete sheet vibratory sinking pile are put forward.

JG/T 477—2015《混凝土塑性阶段水分蒸发抑制剂》标准解读

李磊1,2，王伟1,2，田倩1,2，刘加平1,2

２０16年第3期

摘要

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摘要：JG/T 477—2015《混凝土塑性阶段水分蒸发抑制剂》已于2016年1月1日开始实施。为便于准确贯彻实施该标准的具体要求和规定，本文介绍了JG/T 477—2015标准的编制背景、编制目的和意义，并对其主要条款作了解读。 Abstract: The construction industry products industry standard JG/T 477—2015 Evaporation retardants for concrete during plastic stage was officially issued, which was implement on January 1st, 2016. As a new standard, in order to carry out and implement the specifications of the standard reasonably and scientifically for the users, the establishing background, purpose and meanings of the standard are introduced, and the main issues of the standard are interpreted.

憎水剂对超轻发泡混凝土性能的影响研究

何顺爱1，朱晓燕2

２０16年第3期

摘要

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摘要：以普通硅酸盐水泥与硫铝酸盐水泥为胶凝材料，采用物理发泡工艺制备了干密度小于300kg/m3的发泡混凝土，研究了三种憎水剂对发泡混凝土抗压强度、体积吸水率及孔结构的影响。研究表明：憎水剂掺量增加，试样7d及28d抗压强度先增加后降低，憎水剂硬脂酸钙相对于苯丙乳液及有机硅，对试样干密度及气孔结构影响最小，体积吸水率降低最为明显；当硬脂酸钙掺量为2.5%时，干密度为274.1kg/m3的试样28d抗压强度为0.65MPa，体积吸水率为8.6%。Abstract:ForordinaryPortlandcementandsulphoaluminatecementascementitiousmaterials,foamedconcretefordrydensitylessthan300kg/m3ispreparedbyphysicalfoamingprocess,theinfluenceofthreekindsofwaterrepellentsoncompressivestrength,volumewaterabsorptionandporestructureisinvestigated.Theresultsindicatethat,withtheincreasingdosageofwaterrepellent,thecompressivestrengthofsampleswith7daysand28daysisincreasedatfirstthendecreased,comparedwithstyrene-acrylateemulsionandorganicsilicon,theeffectofcalciumstearateondrydensityandporestructureofsamplesistheleast,andvolumewaterabsorptionisdecreasedsignificantly.Whenthedosageofcalciumstearateis2.5%,thedrydensityofsampleis274.1kg/m3,thecompressivestrengthin28daysachieves0.65MPaandthevolumewaterabsorptionis8.6%.

新型节能承重砌块砌体抗剪强度试验研究

武义馨，刘福胜，赵井辉，周涛，温福胜

２０16年第3期

摘要

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摘要：通过对三组（18个试件）新型节能承重混凝土空心砌块砌体进行了抗剪试验研究，分析了该种新型混凝土砌块砌体的变形特征、开裂荷载及极限荷载；揭示了该种新型混凝土砌块砌体抗剪强度影响因素及剪切破坏机理；对现行规范中的抗剪强度计算公式进行了回归分析，得到的计算值与试验值吻合良好，为工程实践提出了参考。 Abstract: The experimental study of shear strength is carried out by 3 groups (18 shear specimens ) of new composite concrete block masonry for load-bearing and energy conservation, the deformation characteristic, cracking load and ultimate load of this new concrete block masonry are analyzed; the influencing factors for shear strength and shear failure mechanism of new concrete block masonry are revealed, meanwhile, the shear strength formula in current code for design of masonry structures is made for regression analysis for engineering practice recommendations which the calculating results are in good agreement with the test results.

锈蚀预应力筋混凝土梁受弯承载性能有限元分析

唐硕1，喻孟雄2，丁权福1，徐晓燕3，明勇1

２０16年第3期

摘要

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摘要：利用ANSYS建立了预应力混凝土梁分离式有限元模型，实现了预应力筋锈蚀后混凝土构件静力承载性能的模拟，分析了预应力筋锈蚀对预应力混凝土构件极限承载力、刚度和破坏形式的影响。结果表明：随着预应力筋锈蚀率的增加，构件的极限荷载和刚度降低，梁顶应变增加，塑性变形能力变差，破坏由延性向脆性发展。 Abstract: Finite element model with disconnect-type of prestressed reinforced concrete beams is established by using ANSYS, the simulation of static load capacity for prestressed tendons with corroded concrete member is achieved, the influence of corroded prestressed tendons on ultimate bearing capacity, stiffness and destructional forms of prestressed concrete members are analyzed. The results show that, with the increase of corrosion rate of prestressed tendons, the ultimate load and stiffness of the member are decreased, meanwhile, the strain of beam is increased, the plastic deformation ability becomes worse, and the failure is developed from the ductile to brittle.

多孔砌块外墙孔内自然通风的热过程分析

黄吴畏1，张兰英2，史世英3，孙伟民1，何嘉鹏1

２０16年第3期

摘要

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摘要：基于物理模型，利用MATLAB软件模拟分析了北京和南京地区民用建筑南外墙在夏季典型气候与太阳辐射共同作用下，在结合了绝热材料（EPS）的三排孔砌块中,自然通风对室内的热影响。结果表明：北京地区随着楼层的升高，其节能的效果呈现先升高后降低的趋势，存在一个峰值接近90%；南京地区随着楼层的升高，其节能效果呈现下降的趋势，在3层时为最高值在60%～70%之间。北京通风墙体的热阻相较不通风时的墙体热阻，最高可提高43.4%，最低提高28.4%；南京通风墙体的热阻相较不通风时的墙体热阻，最高提高了23.2%，最低提高了13.7%。通风墙体在北京更加适用于中高层民用建筑，而在南京更加适用于多层民用建筑。 Abstract: Based on physical model, combined effect of a typical summer climate and solar radiation, the simulation for south wall of civil architecture in Nanjing and Beijing is analyzed by MATLAB software that the indoor heat influence of the natural ventilation is effected, combined with thermal insulation material (EPS) in different combination of the three-hole block. The results show that, the energy saving effect is increased at first and then decreased in Beijing as the rising floor in Beijing area, meanwhile, a peak value is nearly 90%; however in Nanjing the trend of the energy saving effect appears fallen along with the increase of floor, there is a peak value between 60% and 70% at the three floor. When the thermal resistance of the wall is unventilated, the highest thermal resistance of the wall in Beijing is increased by 43.4% and the lowest thermal resistance is increased by 28.4%; compared with in Nanjing, the highest thermal resistance of the wall is increased 23.2% and the lowest of that is increased 13.7%. Therefore, the ventilation wall is more suitable for the high-rise building in Beijing, that is more suitable for multiple-story building.

玻璃纤维与聚合物复掺改性水泥砂浆的研究

高妮1，喻刚强2，赵亚丽1，薛振华1，何文敏1

２０16年第3期

摘要

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摘要：在固定水灰比为0.4条件下，对比了玻璃纤维、聚乙烯醇乳液单掺与复掺时对水泥砂浆抗折、抗压强度的影响，同时研究了复掺情况下玻璃纤维的表面状况及其耐碱腐蚀能力。结果表明，玻璃纤维与聚合物乳液复掺时，水泥砂浆的抗压强度和抗折强度较聚合物单掺都有小幅度增加，在纤维掺量为水泥质量的1.0%、聚灰比为7.5%时，玻璃纤维聚合物水泥砂浆的柔性最大，纤维-聚合物复掺能够使其性能得到进一步改善，效果优于两者的单掺效果。通过耐碱性试验及扫描电镜分析探讨了玻璃纤维与聚合物乳液复掺时对纤维耐碱性能的影响，结果表明，两者复掺可有效填充水泥基材料内部的宏观与微观缺陷，提高界面过渡区的密实程度。 Abstract: The influence on flexural strength and the compressive strength of cement mortar is compared with single-mixed and double-mixed glass fiber and polyvinyl alcohol emulsion,under water-cement ratio of 0.4. Meanwhile, the glass fiber surface condition and alkali corrosion resistance ability are studied in double mixed with glass fiber and polyvinyl alcohol emulsion. The results show that, the compressive strength and flexural strength of cement mortar are slightly increased as glass fiber mixed with polyvinyl alcohol emulsion, when fiber content is 1% of cement quality and the ratio of polymer cement mortar is 7.5%, the flexible of glass fiber polymer modified cement mortar is the maximum, the performance can be further improved by mixed with fiber-polymer, which the effects of double-mixed fiber and polymer is better than single-mixed fiber and polymer. Through alkali resistance test and scanning electron microscope (SEM), the influence on alkali resistance of fiber as double mixed glass fiber and polyvinyl alcohol emulsion, the results indicate that, the macro and micro defects of cement-based materials can be effectively filled as double mixed glass fiber and polyvinyl alcohol emulsion, and the density degree of the interface transition zone has been improved.

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