关键词:喷射混凝土;硅灰;粉煤灰;抗压强度;抗折强度;坍落度 中图分类号:TU528.041文献标识码:A文章编号:1005-8249(2013)02-0003-05 Ding Peng, Yang Jian-hui, Li Yang-fei, Xiong Zheng-zhuan, Ding Sheng-jun (1. School of Civil Engineering of Henan Polytechnic University, Jiaozuo 454000, Henan; 2.Henan Haitian construction cost consultation firm Co. Zhengzhou branch pany, Zhengzhou 450ooo, Henan) Abstract:It is tested on the physical and mechanical properties of shotcrete whenmixed silicon ah and fly ash in this paperbsd on the shortings of shotcrete in lower strength at early stage,unstable strength at later stage and simple mix proportion, etcat present, It shows that silia fume can improve carly strength, but reduce the concrete slump degrees; and fly ash reduce early strengh, but improve post strength when it is activated after a period of time. In the nd, the optimal mixture ratio and the best proportion of esch submaterials are determined according to the analysis of orthogonal test results, which can meet enginering requirements in general. Key wordsshotcrete; silica fumeflyash pressiv strength;flexural strength: slump 喷射混凝土是借助喷射机械,利用压缩空气或其易性好、强度易于保证等优点,但施工工艺较复杂,成 他动力,将按一定配比的水泥、砂、石子和外加剂等拌本较高2。
粉煤灰综合利用 FLYASHCOMPREHENSIVEUTILIZATION2015 NO.6
建筑科技
砌体结构不同部位在地震力作用下的破坏特点及相关建议 Damage Characteristies on DifferentParts of Masonry Structure under the Earthguake and Related Suggestion
张雷 (河北建研科技有限公司,石家庄050000) 摘要:对砌体结构的常见震害现象进行了简要描述,归纳了砌体结构的震害特点,对砌体结构窗间墙、楼梯间及 小塔楼等抗震薄弱部位进行了简要分析。
粉煤灰综合利用 2016N0.4 FLY ASH COMPREHENSIVE UTILIZATION 试验与应用 短龄期养护条件下高抗硫硅酸盐水泥的抗侵蚀能力初探* Preliminary Study about the Ability of High Sulfate Resistance Portland Cement(PHSR) Resistance to Sulfate Erosion in Short Curing Age Conditions 李双喜 (新疆农业大学水利与土木工程学院,乌鲁木齐市830052) 摘要:在一些实际工程中,基础混凝土在浇筑完成不久后就会遭受硫酸盐侵蚀,此时,高抗硫硅酸盐水泥配制的 混凝土抗侵蚀能力研究成果较少.本文模拟混凝土浇筑完成不久就遭受硫酸盐侵蚀的特殊情况,分析探讨了不同水灰 比条件下高抗硫硅酸盐水泥胶砂试件在短龄期养护时抵抗硫酸盐侵蚀的能力.通过研究发现:①在短龄期养护条件下, 当水灰比≥0.45时,高抗硫硅酸盐水泥混凝土无抵抗硫酸盐侵蚀的能力;②在短龄期养护条件下,当混凝土所处的硫酸 根离子浓度≤2500mg/L时,高抗硫硅酸盐水泥混凝土的水灰比应≤0.35;当混凝土所处的硫酸根离子浓度≤4000mg/L 时,高抗硫硅酸盐水泥混凝土的水灰比应≤0.30;③在短龄期养护条件下,若环境水中硫酸根离子浓度≥4000mg/L时, 直接采用高抗硫水泥配制的混凝土就有遭受侵蚀破坏的危险,为避免给工程留下安全隐患,宜采用其他更为稳妥的抗侵 蚀措施. 关键词:高抗硫水泥;混凝土;短龄期养护;抗侵蚀能力 中图分类号:TQ172.73*3 文献标识码:A 文章编号:1005-8249(2016)04-0038-03 Li Shuangxi (College of water conservancy and civil engineering of Xinjiang Agricultural University 830052) Abstract:This article simulated the special case of concrete pouring finish soon after eroded by Sulfate analysed and probed the ability of PHSR mortar Test block resistance to erosion in short curing age conditions with different water-cement ratio.Through the study found:①When Water-cement ratio≥0.45 in short curing age there'no ability for P.HSR conerete resistance to Sulfate erosion.②When in the condition of S0 2-concentration≤2500mg/L in short curing age PHSR Water-cement ratio should≤0.35;When in the condition of S0 2 concentrationt 4000mg/L in short curing age PHSR Water-cement ratio should≤0.30.③If concrete in the condition of S0 2-concen...
粉煤灰综合利用 FLY ASH COMPREHENSIVE UTILIZATION 2013NO.4 试验与应用 短龄期养护条件下不同混凝土长期抗硫酸盐侵蚀性能对比* The Long -term Performance of Sulfate Salt Erosion Resistance for Different Concrete in Shortage Curing 李方元1,唐新军2,胡小虎3 (1.新疆维吾尔自治区水利管理总站,乌鲁木齐830000;2.新疆农业大学水利与土木工程学院, 乌鲁木齐830052;3.新疆维吾尔自治区水利水电勘测设计研究院,乌鲁木齐830000) 摘要:通过制配胶砂试件进行长达2年的硫酸盐侵蚀试验,对比研究了短龄期养护条件下硫铝酸盐水泥混凝土 (SAC)、高抗硫水泥混凝土(HSR)和粉煤灰高性能混凝土(PFAC)的抗硫酸盐侵蚀能力.结果表明:短龄期养护条件下 硫铝酸盐水泥混凝土和大掺量(60%)粉煤灰高性能混凝土具有长期抵抗高浓度硫酸盐侵蚀的能力,小掺量(30%)粉煤 灰高性能混凝土和高抗硫水泥混凝土长期抵抗高浓度硫酸盐侵蚀的能力具有局限性. 关键词:硫铝酸盐水泥;高性能混凝土;高抗硫水泥;短龄期养护;硫酸盐侵蚀 中图分类号:TU528.33 文献标识码:A文章编号:1005-8249(2013)04-0021-04 Li Fang-yuan' Tang Xin-jun2 Hu Xiao -hu (1.Water Management Station of Xinjiang Uygur Autonomous Region Urumqi 830000 China; 2.College of Water Conservancy Civil Engineering Xinjiang Agricultural University Urumqi 830052 China; 3.Survey Design Institute of Water Resources and Hydropower of Xinjiang Uygur Autonomous Region Urumgi 830000 China) Abstract:The capability of resisting sulfate corrode of sulphoaluminate cement concrete(SAC) high sulfur resistant cement concrete (HSR)and high performance fly -ash concrete PFAC)was tested by the sulfate erosion experiment for 2 years.It indicates that sulphoaluminate cement concrete and high volume(60%)fly -ash Concrete can resist the erosion of high concentration sulfate for a long time but fly-ash Con- crete with low admixture of 30%and high sulfur resistant cement concrete HSR)has limitations. Key words:sulphoaluminate cement;high performance concrete;high sulfate resistant cement;short term curing:sulfate attack 硫酸盐侵蚀是混凝土耐久性重要内容之一.混凝不利影响.本文以实际工程会遇到基础混凝土浇筑完 土遭受硫酸盐侵蚀破坏是我国西北高寒干旱区(如新 成不久或得不到充分养护时就遭受硫酸盐侵蚀的问题 疆),尤其是盐碱地地区普遍存在的混凝土病害问题. 为试验背景,通过以往长达2年的硫酸盐侵蚀试验,对 混凝土受硫酸盐侵蚀是一个长期的较为复杂的物理和 比研究了短龄期养护条件下硫铝酸盐水泥混凝土、粉 化学过程,影响和评价混凝土的抗硫酸盐侵蚀的因素 煤灰高性能混凝土和高抗硫水泥混凝土长期抵抗高浓 也较多,如水泥品种、养护制度、侵蚀溶液浓度、侵蚀龄 度硫酸盐性能的差异,希望能为有硫酸盐侵蚀性能要 期等.目前提高混凝土抵抗硫酸盐侵蚀能力的研究对 求的混凝土结构设计提供较为广泛的参考依据. 象主要集中为抗硫水泥混凝土和掺超细掺合料(如粉 1试验材料与试验方法 煤灰、矿渣微粉等)的高性能混凝土,笔者在前期也 开展过硫酸盐水泥混凝土抗硫酸盐侵蚀性的研究2, 1.1试验原材料 但多数侵蚀试验时间偏短,侵蚀...
粉煤灰综合利用 FLY ASH COMPREHENSIVE UTILIZATION 2010NO.4 试验与应用 白泥混合土处理渗滤液效果的试验研究* Research of Leachate Treatment Effect by Soil Mixed with White Mud 李青松13,乔志香2,金春姬3,马晓雁 (1.厦门理工学院水资源环境研究所,福建厦门361005;2.国家海洋局北海预报中心,山东青岛266033; 3.中国海洋大学环境科学与工程学院,山东青岛266003;4.浙江工业大学建筑工程学院,浙江杭州310014) 摘要:研究了白泥含量为20%的混合土对C0D和氨氮的去除效果及影响因素.结果表明,进水C0D负荷在 36.14-144.58g/(m2.d) 水力负荷15.92~191.08L/(m2.d)之间变化时,混合土对C0D去除率一般为60%,对氨氮的 去除率在90%以上.水力负荷和污染物负荷对渗滤液中污染物的去除率有较大的影响,水力负荷与污染物的去除率呈 负相关,污染物浓度负荷与污染物的去除率呈正相关,且污染物的浓度负荷影响较大. 关键词:白泥;填埋场;COD;氨氮 中图分类号:X781.2 X703.1 文献标识码:A文章编号:1005-8249(2010)04-0013-04 LE Qing-song13 Qiao Zhi-xiang' Jin Chun-ji Ma Xiao-yan' (1.Water Resources and Environmental Institute Xiamen University of Technology Xiamen Fujian 361005 China; 2.North Sea Marine Forecast center of State Oceanic Administration Qingdao Shandong 266033 China; 3.College of Environmental Science and Engineering Ocean University of China Qingdao Shandong 266003 China; 4.College of Civil Engineering and Architecture Zhejiang University of Technology Hangzhou Zhejiang 310014 China) Abstract:The removal rates and influence factors of COD and ammonia -nitrogen dealt by the mixed soil which coatained 20%white mud was invested.The result shows that the removal of COD is above 60% the removal cf ammonia-nitrogen is above 90%when hydraulie loading change froem 15.92 L/(m2.d)to 191.08L/m2.d) COD loading change froem 36.14 g/(m2.d)to 144.58g/(m2.d).The removal of COD and ammonia nitrogen are poeitively correlated with the concentrati...
粉煤灰综合利用 2018 NO.4FLYASHCOMPREHENSIVEUTILIZATION 试验与应用
电场条件石灰改良盐渍土及消除盐胀机理研究 Study On ImprovingSalty Soil usingLime inElectrochemistry for Eliminating Salt-swelling
刘屹斯1,黄雪峰12,张彭成1,周俊鹏,殷鹤,方晟1
(1.陆军勤务学院军事设施系,重庆401311;2.兰州理工大学土木工程学院,甘肃兰州730050) 摘要:本次试验是针对盐渍土的盐胀特性,采用加人石灰并外加电场条件的方式对盐渍土进行了改良并开展相应 盐渍土改良为非盐渍土;(2)通过试验对比,改良前后的盐胀差异性很大,改良后的盐渍土在低温下具有很好的稳定性, 消除了盐胀特性;(3)在盐渍土地区,采用少量石灰外加电场条件改良技术能有效改良盐渍土,可作为盐渍土消除盐胀 有效的地基处理技术,也为局部土地消除盐碱化提供有效手段和应用前景。
关键词:盐渍土;石灰;盐胀;电化学 中图分类号:TU448文献标识码:A文章编号:1005-8249(2018)04-0044-04 Liu Yisi,Huang XuefengZhang PengchengZhou Junpeng,Yin He,Fang Sheng 1.DeparmntfMilitaryFaciltiesAmyLgisticalUniversityfPLA,Chngqing401311h; 2. College of Civil Engineering,Lanzhou Univ.of Tech.Lanzhou 730050, China) Abstrat:hxperntsedatlnatingthsaltwellingaatristifsaltyilIstheal xpanion testhatrvedaly soil using lime in electrochemistry at low temperatureTheresult shows that: (1) Sulphate sals remove saltby adding a certain proportion of the lime and eletrochemistry. ( 2) Improved salty soil remove the saltswelling characteristics through experimental parison. 3) In actual engineering, electrochemistry modified salty soil ill be used as a technical process for sulhate saly soil treatment. Keywords: sulphate salty soil;lime; salt-swelling: electrochemistry
近年来,随着我国西部大开发战略不断推进和具备潜伏性、隐蔽性和长期性等特点,对低荷载的 “一带一路”战略规划和进人实施阶段,西北地区发工程建筑具有很高的危害[2。