加气混凝土砌块墙体裂缝产生的机理及防治

加气混凝土砌块在应用中,由于本身的干缩变形等特点会导致墙体裂缝现象。本文从分析加气混凝土砌块的主要特点入手,探讨了加气混凝土砌块墙体裂缝形成的机理及产生的原因,并提出了相应的防治措施。     

蒸压加气混凝土砌块墙体裂缝的防治

介绍了蒸压加气混凝土砌块的特性，施工准备及施工工艺，分析了蒸压加气混凝土砌块墙体裂缝产生的原因，提出了有效防治墙体裂缝的措施，需从设计和施工两个方面入手，才能确保砌块墙体的施工质量。     

干法脱硫灰在加气混凝土砌块中的开发与应用

根据公司产的脱硫灰具有的胶凝性、颗粒细、密度轻等特性提出了将其应用于加气混凝土砌块的设想,通过实验和工业化生产实践,表明了将干法脱硫灰应用于加气保温砌块是完全可行的。目前,加气混凝土砌块是公司产的脱硫灰的主要应用途径之一,该技术的使用既为梅钢创造了效益,又践行了绿色经营的理念。     

谈蒸压加气混凝土自保温墙体工程质量监督要点

针对当前蒸压加气混凝土砌块自保温墙体工程设计、施工及质量监督管理中存在的问题,结合工程质量监督工作实践,进行了分析和讨论,研究了推进质量监督模式向动态监督方式转变的必要性,并提出做好蒸压加气混凝土砌块自保温墙体工程质量监督的工作要点.     

新型墙体材料在建筑中的应用

发展新型墙体材料和推广节能建筑，其中混凝土小型空心砌块和加气混凝砌块土已广泛用于工业及民用建筑，它们具有轻质高强、保温隔音好等特点，作为承重或非承重的结构材料和保温材料，对建筑节能、节约土地、利用废料等方面具有显著的效果。     

利用选金尾矿生产系列硅酸盐墙体材料的工艺技术研究

本文对以选矿金尾矿为主要原料，生产蒸压标准砖，榫式砖，空心砌块，加气砌块等硅酸盐墙体材料的生产工艺流程和工艺参数进行了全面论述和详细讨论。     

黄金生产尾矿综合利用的研究与应用

对山东金洲矿业集团有限公司选金尾矿和尾矿库堆存尾矿进行综合回收利用研究,高品位尾矿首先进行堆浸提金处理,然后堆浸提金处理后的尾矿和低品位尾矿作为生产加气混凝土砌块、蒸压砖、多孔砖等建筑材料的原料。通过尾矿堆浸提金、尾矿生产建筑材料的方式充分利用尾矿资源,达到有效解决尾矿堆放问题、充分利用尾矿资源价值、发挥矿产资源最大经济效益的目的。     

污酸中和渣制备高性能建筑胶凝材料的研究

污酸中和渣为冶炼过程中产生的废渣,固含量中的主要成分为硫酸钙,另含微量的砷、汞、铅、锌、镉等重金属元素。现污酸中和渣一直未进行有效利用,处于堆存状态,而废渣的堆存有可能使废渣中的重金属发生迁移导致污染。文章对污酸中和渣制备高性能建筑凝胶材料进行了试验研究,成功制备了符合要求的凝胶材料(混凝土加气砌块),为该渣料的高值资源化利用提供了参考。     

山东金洲矿业集团

山东金洲矿业集团始建于1970年4月，是集黄金勘探、采选、冶炼以及尾矿综合回收利用于一体的现代化矿山企业，为全国黄金行业率先跨入吨金矿山和利税过亿元企业之一。2004年11月，公司改制为山东黄金集团控股的有限责任公司。目前公司下辖4个成员单位，拥有总资产5亿元，职工2000余人，年生产黄金5万两，年产尾矿加气混凝土砌块15万方、蒸压砖6000万块。     

钒钛磁铁矿尾矿对蒸压加气混凝土砌块的影响

以承德地区的钒钛磁铁矿选铁尾矿为主要原料制备了加气混凝土砌块,研究了尾矿细度及添加量对制品干密度与抗压强度的影响,采用XRD和SEM分析了尾矿添加量调控样品相组成与显微结构的机理,检测了制品的吸水率与耐水性等相关性能。结果表明:尾矿经球磨20 min后,-0.074μm颗粒含量增至90.23%。提高尾矿细度增大了样品的致密度,引入尾矿使样品的干密度与抗压强度先增大后减小。采用尾矿(球磨20 min)∶水泥∶石灰∶石膏=60∶20∶15∶5的工艺条件,制备出加气混凝土砌块的抗压强度大于4.0 MPa,干密度小于595 kg·m~(-3),综合性能满足GB11968—2006标准中A4.5等级的要求。XRD与SEM分析表明,添加40%～60%尾矿有利于生成C-S-H凝胶与托贝莫来石。两者相互胶结,使制品具有较高的强度,较优的吸水率及耐水性。     

球墨铸铁管的质量改进

对球墨铸铁管的不合格品进行统计分析，根据因果图分析认为产生承口及中部水压试验不合格的因素主要是人、设备、原材料、工艺等几方面，并就相关因素采取了具体的改进措施，使球铁管的打压合格率由86.22%提高到95%以上。     

Lateral Out-of-Plane Strengthening of Masonry Walls with Composite Materials

The structural behavior of masonry walls laterally strengthened with externally bonded composite materials to resist out-of-plane loads is theoretically and experimentally studied. Hollow concrete block masonry walls and solid autoclaved aerated concrete (AAC) block masonry walls are examined. A theoretical model that accounts for the cracking and the physical nonlinear behavior, the debonding of the composite layers, the arching effect, the interfacial stresses, and the unique modeling aspects of the laterally strengthened wall is presented. The experimental study includes loading to failure of 4 laterally strengthened masonry walls and 2 control walls. The experimental and analytical results point at the unique aspects of the lateral strengthening of masonry walls with composite materials. In particular, they reveal and explain the premature shear failure in laterally strengthened hollow concrete blocks walls and, on the other hand, demonstrate the potential of lateral fiber-reinforced polymer strengthening of AAC masonry walls. The laterally strengthened AAC masonry walls reveal improved strength, deformability, and integrity at failure characteristics.     

Autoclaved Aerated Concrete Produced with Low NOx Burner∕Selective Catalytic Reduction Fly Ash

Electric utility coal combustion processes employing low NOx burner and high-dust selective catalytic reduction (SCR) emission control technologies produce fly ash that is high in carbon and ammonium salt content. Such ash is considered undesirable for use as admixture in standard concrete because of its decreased compressive strength and ammonia odor. This research investigates the use of low NOx burner∕SCR fly ash for production of autoclaved aerated concrete (AAC). For this study, samples were obtained from the Orlando Utility Commission's Stanton Power Generation Plant Unit 2, which contained 6% carbon and 28 mg of ammonium ion∕kg fly ash. A number of AAC recipes were developed with this ash, producing blocks with compressive strength values ranging from 2.268 to 4.435 kPa and densities ranging from 560 to 812 kg∕m3. During block production, carbon particles in the ash exhibited hydrophobic properties and separated from water at the AAC slurry∕gas bubbles boundary that is produced in the rising cake. Separated carbon was unable to physically interfere with calcium silica hydrate gel formation occurring in the slurry. In addition, the alkaline environment inside the reactive AAC slurry was sufficiently high to cause the release of ammonia gas. Consequently, ammonia odor was not observed during the later setting of an undisturbed block or during curing stages of the finished block. The toxicity characteristic leaching procedure and synthetic precipitation leaching procedure were found to be below the appropriate toxicity thresholds. In general, toxicity characteristic leaching procedure concentrations were higher than synthetic precipitation leaching procedure concentrations for all samples and all analytes (As, Ba, B, Cd, Cr, Ni, and Pb). It is concluded that the high carbon, ammonia bearing fly ash from the Stanton Unit 2 Low NOx burner∕SCR pulverized coal combustion process is a suitable source of siliceous material for the production of AAC prototype block, from physical, environmental, and aesthetic perspectives.     

基于生命周期评价法的铜尾矿资源化利用的环境效益分析

以铜尾矿为研究对象,运用生命周期评价(LCA)法对铜尾矿堆存以及3种铜尾矿资源化利用方法的环境影响进行比较.结果表明,处理1t的铜尾矿,方案1:堆存,对环境的主要影响为生态毒性(ET:7.05×10-1)和人体毒性(HT:1.467×10-7);方案2:铜尾矿代替水泥熟料中的黏土,主要环境影响类型初级能源消耗(PED)...     

烧结原料场物料净化工艺改造

指出安钢烧结原料存在的问题,根据原料净化方法与现有工艺流程,提出原料净化改造方案,通过对安钢两个原料场物料净化的改造,降低了皮带机的非正常挂断、磨损等设备故障,提高了设备运行效率,满足了原料系统的生产需求。     

Development and application of performance standards for Naval Petty Officers.

To help accomplish its assigned mission for the Navy, the Bureau of Naval Personnel must fulfill its functions of "Procurement" of kinds and numbers of personnel, "Training" them to the necessary skill level, the "Distribution" of the right men to the right jobs at the right time, and "Promotion." Essential in all aspects of personnel operations are performance standards. These standards must be continuously adjusted to meet and conform to the changing conditions facing the bureau and the Fleet: changes in weapons and equipment, changes in Fleet operations, changes in quality of personnel input, and time-factor changes. The bureau has an integrated system in operation for establishing, maintaining, and applying up-to-date performance standards for enlisted personnel. Starting with field analysis of the weapons and equipment during their developmental and test phases, the occupational analysis data generated are used to phase equipment into the existing occupational classification system of the Navy. The specific performance requirements, after being codified, are then used as a basis for the preparation of study and training materials. The attainment of the requisite performance standards is then given official recognition by the promotion process. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

铜冶炼厂安全设施设计浅析

铜冶炼厂从原辅材料到产品的贮存、使用过程均存在着各种安全因素,铜冶炼厂的安全生产和劳动者的人身安全及周边的环境安全是此类企业工程设计的重要环节。在对铜冶炼厂各工艺过程及设备的危险有害因素进行分析筛选的基础上,简要说明了现阶段国内大型铜冶炼厂设计采用的主要安全防范设施,为铜冶炼厂及类似企业的安全设计提供参考。     

石灰乳制备系统工艺选择与设计

通过对用于处理含重金属的酸性污水的石灰乳制备原料—石灰和消石灰、消化的原理与分类、主要设备和系统设计的分析,认为在石灰乳制备系统的设计中粉、块混合状物料适合采用常温消化工艺,粉状物料则适合采用中温消化工艺。     

采用100%巴西南部硬赤铁矿的球团工程主要设计特点

以100%巴西南部硬赤铁矿为原料,采用链篦机-回转窑球团工艺生产球团矿,一般相对于磁铁矿球团而言,在技术上存在较大难度.本文从原料准备、造球、热工制度、主机设计等方面对其工艺设计特点进行了阐述与分析.