粉煤灰综合利用 FLYASHCOMPREHENSIVEUTILIZATION 2018 NO.2 建筑科技 分层注浆法在既有建筑物地基加固中的应用 Application of Stratified Grouting Method in the Reinforcement of Existing Buildings Ground 贾文亮1,褚少辉12,闫敏鸣”,周立欣“ (1.河北建研科技有限公司,石家庄050021;2.河北省既有建筑综合改造工程技术研究中心,石家庄050021; 3.石家庄铁道大学,石家庄050043;4.中国核电工程有限公司河北分公司,石家庄050000) 摘要:以某注浆加固工程为例,研究了分层注浆加固技术在处理既有建筑物不均匀沉降问题中的应用。
结果显 示,分层注浆可以有效的提高地基承载力,减小建筑物的沉降,加固效果显著。
关键词:既有建筑;回填土;分层注浆;沉降观测 中图分类号:TU472文献标识码:A文章编号:1005-8249(2018)02-0075-03 Jia Wenliang', Chu Shaohui², Yan Minming,Zhou Lixin ( 1. Hebei Building Research Technology Co. Ltd, Shijiazhuang 050021; 2.The engineering technical research centre of prehensive reconstruction existing buildings of Hebei province. Shijiazhuang, 050021;3. Shijiazhuang Tiedao University,Shijiazhuang, 050043; 4. China nuclear power engineering co.,LTD. He Bei Branch Shijazhuang, 050000.) Abstraet:The paprgave nxamplefgrouting reinforement projctwhih studied the appliction of stratiied groting reinforcement teciqu in dealing with the uneven etlement problm of th existing buildings.The results how that the stratiedgroing can feetively mprove the bearing capacity of thefoundation and decrease the setlement of bildings and ge a significant reinforcment effect. Keywords: existing buildings; backfillsoil; the stratified grouting; the settlement measurement 注浆加固技术研究各种注浆浆液在土体孔隙或 岩体裂隙中流动扩散的规律,揭示地质情况、浆液 1工程概况 性质和注浆工艺之间的相互关系,为注浆设计和注浆 项目位于河北省任丘市境内,重车调车机行走 施工提供科学依据。
粉煤灰综合利用 2011 NO.5FLYASHCOMPREHENSIVEUTILIZATION 专题研究
减水剂对C80PHC 混凝土拉/压比的影响研究 Study on the Influces of Water-reducing Admixture on CSoPHC Concrete Tension and Compression Ratio
何燕,张雄,张永娟 (同济大学材料科学与工程学院建筑材料研究所,上海201804) 摘要:以管桩生产配合比为基本参照,分别研究了蔡系、聚羧酸、氨基磺酸盐和磺化丙酮等4种减水剂对C80PHC 混凝土抗压强度、劈裂抗拉强度,拉/压比以及密实性的影响。
粉煤灰综合利用 FLYASHCOMPREHENSIVEUTILIZATION2015 NO.1
专题研究
冻融循环过程中砂浆电阻率变化及其机理分析 Mechanism Analysis and Change of Mortar Elecrical Resistivity during Freezing-thawing Cycles
侯云芬',王玲²,吴越恺,王振地² (1.北京建筑大学,北京,100044;2.中国建筑材料科学研究总院,北京,100024) 摘要:混凝土或砂浆内部孔隙中液相的变化直接影响其导电特性,在冻融循环过程中,随着温度-湿度的变化,砂 浆孔隙不仅液相离子浓度会变化,而且还会结冰,最终引起其电阻率变化,具体表现为:无论是降温段,还是升温段,电阻 率均随温度降低而增大;在低温区段,电阻率变化幅度较大,在高温区段,电阻率变化幅度很小,且在结冰温度范围内出 现了突变现象;在每一个冻融循环内电阻率均出现滞回现象,且滞回环并不饱满,在-10℃~5℃温度(即结冰和融化温 度)范围内曲线出现了转折;随冻融循环次数的增加,电阻率呈现增大趋势,尤其是温度最低点时的电阻率增加幅度 较大。
关键词:电阻率;冻融循环;湿度;变形 中图分类号:TU528.1文献标识码:A文章编号:1005-8249(2015)01-0003-04 Hou Yunfen', Wang Ling', Wu Yuekai', Wang Zhendi² Abstract; The change of fuid in voids of concrete and mortar willaffect their elctrical resistivity.During frezing thawing cycle, the concentration of fuid in voids changes with the change of temperaturehumidity, even frze to result in the change of elctrical resistivity. The lectrical resistivity ces with thereducing f tempeae; nd therangeity f elcrical resistivity is biggeriw tmetue eriod t i ismaller nhightee eriodThe eticresistivity shw sude cae dring fnteeaue erod and ars the hstei phenomenon in cach frzingthawing cycleThe letrical resistivity inceases with creing f frezingthawing cycle index,especially at th lowest temperature. Key Words :electrical resistivity; freezing=thawing cycle; humidity; deformation 混凝土是固相、液相、气相共存的组合体。
粉煤灰综合利用 FLYASHCOMPREHENSIVEUTILIZATION2014 NO.6
试验与应用
冻融循环过程中混凝土的过冷现象及其原因分析 The Concrete Surfusion and its Causein Freezing and Thawing Cycle
侯云芬,王玲²,吴越恺,王振地
(1.北京建筑大学,北京100044;2.中国建筑材料科学研究总院,北京100024)
摘要:在研究冻融循环过程中混凝土和砂浆试件湿度和变形随温度变化规律时发现,在降温段混凝土和砂浆试件 在0℃时并没有结冰,其冰点为-15℃,即出现了过冷现象。
关键词:过冷现象;碘化银;胆固醇;冻融循环;混凝土 中图分类号:TU528.0文献标识码:A文章编号:1005-8249(2014)06-0015-04 Hou Yunfen', Wang Ling², Wu Yuekai', Wang Zhendi² (1.Bejingniversity fCivilEnginering andrchitecture,Bejing,10004,Chn; 2.China Building Materials Academy,Beijing,100024, China) Abstract:It shows that the freezing point is 15°℃,instead of 0°℃which is surfusion during freezing and thawing cycle of concrete. By analyzing thecauefurfusiitolethat sufusicanb liminatbyaddingcondenatinnleussuhassilverodidendcholete which can increase the frezing point for 5°℃. Key words:surfusion; silver iodide; cholesterin; freezing and thawing cycle; concrete 耐久性是混凝土的主要技术性能,而抗冻性是耐碎石。
粉煤灰综合利用 FLY ASH COMPREHENSIVE UTILIZATION 2014N0.4 专题研究 再生骨料透水混凝土体积法配比设计关键参数的优化选择* Optimal Selection for Key Parameters of Porous Pervious Concrete made from Recycled aggregates's Mix Design with Method of Volume 龚平,张高波,周余 (长江大学城市建设学院,湖北荆州434023) 摘要:以再生骨料配制的透水生态混凝土为研究对象,用体积法进行配合比设计并调整不同的配比参数,研究保 证再生骨料配制透水生态混凝土透水性和强度的最佳配比参数,并比较再生骨料与天然骨料配比设计中参数选择的异同. 关键词:再生骨料;透水混凝土;体积法配比设计;抗压强度;透水系数 中图分类号:TU528.0 文献标识码:A文章编号:1005-8249(2014)04-0003-03 Gong Ping' Zhou Yu? (Civil Construction College of Yangtze University Hubei Jingzhou 434000 China Abstract:The porous pervious concrete made from recycled aggregates was selected as the object of study.With method of volume the mix design parameters of various ratios were adjusted to study out the optimal mix parameters to obtain good permeability and enough strength.The similarities and differences of the optimal mix parameters'selection between the concrete made of recycled aggregate and natural aggregate was pared. Key words:Recycled aggregates Porous pervious concrete;Mix design with method of volume;Compressive strength;Permeability coefficient; 透水混凝土配合比设计常用方法有质量法、体积 1原材料及试验方法 法和比表面法,再生骨料配制透水生态混凝土,成熟经 验较少,不适用利用经验图表的质量法,比表面积法以 1.1原材料 假设骨料颗粒为球形计算而得,而再生骨料为天然骨 水泥:P042.5水泥,华新水泥股份有限公司生 料破碎而成,表面与球形差异巨大,因而也不适用比表 产.粗骨料:由引江济汉荆州段实验试块C25废弃混 面积法.体积法是以原有粗骨料孔隙率为基础,依据 凝土试块人工破碎,粒径16mm~20mm.砂:建筑中 目标孔隙率经过详细计算,以控制填浆体积,采用体积 砂,细度模数2.36.减水剂:聚羧酸盐类高效减水剂, 法进行透水混凝土配合比设计的关键是对主要参数的 掺量2%~3%.水:自来水. 确定1.本文采用体积法进行配合比设计并调整不1.2试验方法 同的配比参数,以再生骨料配制的透水生态混凝土为 1.2.1成型方法成型方法为人工插捣...
粉煤灰综合利用 2015NO.6FLYASHCOMPREHENSIVEUTILIZATION 专题研究
再生细骨料及矿物掺合料对再生砂浆强度及微观结构的影响 The Influence of The Recycled Fine Aggregate andMineral Admixture on the Microstructure and Strength of Recycled Motar
李滢,代大虎,龚志起
(青海大学土木工程学院,西宁810016) 摘要:将不同来源的2种再生细骨料及矿物掺合料以不同的掺配方式掺人砂浆中,研究了再生砂浆强度及微观 结构的变化。
关键词:再生细骨料;再生砂浆;水泥石;矿物掺合料;再生细骨料取代率 中图分类号:TU52*.09文献标识码:A文章编号:1005-8249(2015)06-0006-04
Li Ying,Dai Dahu,Gong Zhiqi (School of Civil Engineering, Qinghai University, Xining, 810016) Abstract:ymixing two series recycled fine aggregates derived from diferent origins and mineraladmixtures into cemen mortar, the infuence on themirostrueture and stength of recycledmortaris studied.It is demnstrated that with th increasing ofreycled fineaggregate replarathhanef thstnhfttwithtiswreleatareifWherlet replamentrats%mixdfyahnsilfutrelmarparatlynjoilythartteeyfcprevesth andmitewthrlygthfydebtdeyelh microstructure of the cement gel tends to be more dense. Key Wordsrecycled fine aggregaterecycled mortarcement gel;mineral admixturesrecycled fine aggregate replacement rate 随着城市建设的不断发展,建筑行业在消耗大量块、废砖、废砂浆)作为一种资源,经裂解、破碎、清洗 自然资源的同时,还会产生庞大的固体废弃物,如拆除和筛分等加工处理,可以得到再次用于生产混凝土的 旧建筑所产生的废弃混凝土等建筑垃圾。
粉煤灰综合利用 FLYASHCOMPREHENSIVEUTILIZATION 2013 NO.5 试验与应用 保温墙体系统体积稳定性影响因素研究* Study on Volume Stability of Wall Insulation System 娄建永',张立明²,郑林军3 (1.杭州永翔建设集团有限公司,杭州,311000;2.浙江明杰建设有限公司, 杭州,311000;3.浙江申盛建筑工程有限公司,杭州,311000) 摘要:保温系统面层的裂缝是保温建筑的质量通病,保温层、抗裂保护层若发生开裂,墙体保温性能就会发生很大 改变,不能满足设计的节能要求。
粉煤灰综合利用 2011NO.3 FLY ASH COMPREHENSIVE UTILIZATION 低碱水泥对粉煤灰混凝土开裂敏感性影响研究 Study on the Influence of Low-alkaline Cement on Crack Susceptibility for the Concrete with Fly Ash 李红君2,屠柳青,陈伟2,邓波1,刘松1 (1.中交武汉港湾工程设计研究院有限公司,武汉430040;2.武汉理工大学,武汉430070) 摘要:荆岳长江公路大桥地处洪涝灾害频发的长江中游地区,具有重要的交通枢纽作用.为保障混凝土的高性 能、高耐久性,同时避免碱集料反应破坏、劣化混凝土结构,工程上部结构采用低碱水泥混凝土.本文在比较低碱水泥混 凝土的力学、热学性能与普通混凝土规律一致的基础上,通过温度应力试验研究表明,粉煤灰对低碱水泥混凝土开裂敏 感性影响与普通混凝土一致,且降低混凝土浇筑温度,更有利于降低低碱水泥混凝土应力积累速率,有利于控制混凝土 早期开裂. 关键词:低碱水泥;粉煤灰;混凝土;温度应力试验;应力积累速率;开裂 中图分类号:TU528.2 文献标识码:A文章编号:1005-8249(2011)03-0020-05 Li Hong-jun12 Tu Liu-qing' Chen Wei? Deng Bo' Liu Song' (1.CCCC Wuhan Harbour Engineer Design and Research Co Ltd Wuhan 430040 China: 2.Wuhan University of Technology Wuhan 430070 China) Abstract:The location of Jing Yue Yangtze River bridge is in the middle of Yangtze River where the flood is frequent.This bridge is important for the road net of China.In order to ensure the durability and performance of concrete and to prevent the alkali-aggregate reaction from destroyed the elements low alkaline cement is adopted to prepare concrete.This article pared the properties of mechanical and thermal for the concrete with low alkaline content cement to the normal concrete.The temperature-stress test indicated that the cracking sensitivity of fly ash for the concrete with low alkali content cement was the same with the normal conerete and the fly ash mixed ean reduce the placement temperature whieh was more advantageous to reduce stress accumulatio...