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第十一期

炼钢铸余渣回收及综合利用研究
炼钢铸余渣回收及综合利用研究
  • 钱 强
2017年第11期
摘要
引用本文
摘  要:铸余渣主要含有C2S、C3S及少量铝酸盐和玻璃质,粒度小于1mm的铸余渣占比为53.11%,通过10mm过筛可获得41%的铸余渣尾粉。在水泥预粉磨中外掺6%的铸余渣,粉磨过程没有出现“饱磨返料”的现象,表明其易磨性较好,但粉磨产量下降4t/h,因此,单独粉磨铸余渣经济性不佳,需搭配各类混合材共同粉磨。在水泥中外掺6%的铸余渣后各项指标满足GB175—2007《通用硅酸盐水泥》。将铸余渣用于替代28%的磷渣微粉后的强度均有所降低,但后期强度可满足GB/T14902—2012《预拌混凝土》的使用要求。Abstract:ThecastingresiduemainlycontainsC2SandC3S,asmallamountofaluminatesandglass.Theratioofcastingresiduetograinsizelessthan1mmis53.11%,and41%ofthetailingspowdercanbeobtainedby10mmscreeningof.Incastingslagcementpregrindingandgrindingprocesswith6%,no"returnsaturation"phenomenon,showitsgoodgrindability,butthegrindingproductiondeclines4t/hours,soseparategrindingslaghasthepooreconomy,whichneedsallkindsofcollocationmixedmaterialgrindingtogether.Afteradding6%ofthecastingresiduetothecement,theindexesmeetGB175—2007GeneralPortlandCement.Thestrengthoftheslagusedtoreplacethe28%slagpowderhasbeenreduced,butthelaterstrengthstillmeetstherequirementsofGB/T14902—2012ReadyMixedConcrete.
钱强.炼钢铸余渣回收及综合利用研究[J].混凝土与水泥制品,2017(11):91-94. QIAN Q.Research on Recovery and Comprehensive Utilization of Steelmaking Refining Slag[J].China Concrete and Cement Products,2017(11):91-94.
几种低品位非金属矿及高硅铝工业废渣的火山灰活性研究
几种低品位非金属矿及高硅铝工业废渣的火山灰活性研究
  • 胡俊阳1,刘冬雪1,冯启明1,2,黄 阳1,2,徐中慧1,2
2017年第11期
摘要
引用本文
摘 要:对几种低品位非金属矿及高硅铝工业废渣等固体废物的火山灰活性进行了研究。结果表明,这些固体废物通过一定工艺条件处理后,具有很好的火山灰活性,是良好的水泥活性混合材和高性能混凝土掺合料。 Abstract: The ash activity of the several kinds of solid waste such as low grade non-metallic mineral and high silicon-aluminum industry waste residues were studied. The result shows that these solid waste has the very good ash activity in a certain process condition treatment, so it’s the good activity of cement mixed material and high performance concrete admixture.
胡俊阳,刘冬雪,冯启明,等.几种低品位非金属矿及高硅铝工业废渣的火山灰活性研究[J].混凝土与水泥制品,2017(11):87-90. HU J Y, LIU D X, FENG Q M,et al.Study on the Ash Activity of Low Grade Non-metallic Minerals and High Silicon-aluminum Industry Waste Residues[J].China Concrete and Cement Products,2017(11):87-90.
无粘结预应力地下室外墙板施工技术
无粘结预应力地下室外墙板施工技术
  • 张永军,徐 群
2017年第11期
摘要
引用本文
摘 要:地下室超长结构在温差、混凝土收缩等作用下,极易出现裂缝,不但影响工程质量,还影响使用功能。通过对地下室外墙板采用无粘结预应力抗裂施工工艺,克服了温差、收缩等引起的拉应力,达到了控制裂缝的目的。 Abstract: Under the influence of temperature difference and concrete shrinkage, the ultra-long structure of basement can easily crack, which not only affects the engineering quality, but also affects the function. The tensile stress caused by temperature difference and shrinkage is overcome by using non-bonding prestressed anti-crack construction technology for underground and outdoor wallboard, which achieves the purpose of controlling crack.
张永军,徐群.无粘结预应力地下室外墙板施工技术[J].混凝土与水泥制品,2017(11):84-86. ZHANG Y J, XU Q.Construction Technology of Unbonded Prestress Basement Wallboard[J].China Concrete and Cement Products,2017(11):84-86.
一种检测混凝土早期体积变形的简便方法
一种检测混凝土早期体积变形的简便方法
  • 臧 军1,沈晓冬1,祖庆贺2,王志学2
2017年第11期
摘要
引用本文
摘 要:利用自制的简易装置可测试混凝土早期的体积变形,测试数据准确可靠,可以较好的反应混凝土的体积变形趋势,对于体积变形量较大的高强度等级自密实混凝土亦与红外测试装置相差不大,此种测试方法具有广泛的适用性,具有一定的推广价值。测试结果表明,聚羧酸减水剂和膨胀剂对混凝土的收缩有较好的抑制作用。矿粉对混凝土的收缩起促进作用,粉煤灰对混凝土的收缩有一定的抑制作用。 Abstract: The simple homemade device is used to determine the early-age volume deformation of concrete, the accurate and reliable results show that this method could reflect the trend of volume deformation of concrete effectively. For the high-strength self-compacting concrete with large volume deformation, the differences of results between the infrared testing device and the method are small. Therefore, this method could be widely applied and worth a certain of promotional value. The results show that polycarboxylate- superplasticizer and expansion agent have the preferable inhibitory action on shrinkage of concrete. Mineral powder play a role in promoting the shrinkage of concrete, while, the fly ash has a certain of inhibitory action on shrinkage of concrete.
臧军,沈晓冬,祖庆贺,等.一种检测混凝土早期体积变形的简便方法[J].混凝土与水泥制品,2017(11):81-83. ZANG J, SHEN X D, ZU Q H,et al.The Method of a Kind of Testing Early-age Volume Deformation of Concrete[J].China Concrete and Cement Products,2017(11):81-83.
一种新型混凝土缺陷测试方法
一种新型混凝土缺陷测试方法
  • 张兴斌1,张行毅2,房 厦1
2017年第11期
摘要
引用本文
摘 要:在我国在建和待建的核电站中,存在大量的大体块混凝土结构及其他形式的复杂混凝土结构,利用传统的超声波测混凝土缺陷方法测试这些结构的内部缺陷存在一定的困难。针对这种检测需要,设计了一种新型混凝土缺陷测试方法,采用能够向四周空间均匀发射超声波的球形埋置式超声波探头,在结构内部组成阵列布置,相互之间收发超声波信号,或与外部手持式平面超声波探头搭配使用,从而分析混凝土内部的密实度状况。 Abstract: Mass concrete structure and other complex concrete structure are commonly utilized in nuclear power plant under construction and to be built in our country. There are different difficulties to detect the internal defect of these structures with traditional test methods. A new method of concrete defect test was researched which utilized a spherical embedded ultrasonic transducer as the core component. The transducers can be located inside the concrete structure in a preset pattern, and motivate or receive the ultrasonic signal with other transducers around or the traditional transducer handled by test personnel on the structure surface to analyze the compactness situation of concrete inside the structure.
张兴斌,张行毅,房厦.一种新型混凝土缺陷测试方法[J].混凝土与水泥制品,2017(11):77-80. ZHANG X B, ZHANG X Y ,FANG X.Testing Method of a New Type of Concrete Defects[J].China Concrete and Cement Products,2017(11):77-80.
预制混凝土箱涵卧式可调模具的制作研究
预制混凝土箱涵卧式可调模具的制作研究
  • 尹怀秀
2017年第11期
摘要
引用本文
摘 要:结合箱涵卧式模具的结构特点以及预制混凝土箱涵产品的成型工艺,针对现有的定型箱涵模具,设计了一种可调节的、模块化的组合式预制混凝土箱涵模具;通过分析现有模具的结构特点与功能,在现有模具的基础上设计了各部件的可调节模块。该可调节模具具有制作精度高、操作简单、生产效率高等优点,通过安装可调节模块实现了卧式箱涵模具的一模多用,从而减少了构件厂的设备投资,满足了目前预制混凝土箱涵产品规格多样化的需求。 Abstract:Based on the structural characteristics of horizontal culvert box mould and the shaping technics of pre-fabricated concrete box culvert products and combined with the existing shaped box culvert mould, the adjustable and modularized composite prefabricated concrete box culvert mould is designed. By analyzing the structural characteristics and functions of the existing mould, the adjustable mould of each component is designed based on the current mould. The adjustable mould has the advantages such as high precision of manufacturing, simple operation, and high production efficiency, the plurality of functions of one horizontal box culvert mould are achieved through adjustable module, the equipment investment of the component factory is reduced, and the demand of the diverse product specification of the prefabricated concrete box culvert is satisfied.
尹怀秀.预制混凝土箱涵卧式可调模具的制作研究[J].混凝土与水泥制品,2017(11):74-76. YIN H X.Research on Preparation of Horizontal Adjustable Mould for Pre-fabricated Concrete Box Culvert[J].China Concrete and Cement Products,2017(11):74-76.
混凝土空心砌块多模式非稳态周期传热特性
混凝土空心砌块多模式非稳态周期传热特性
  • 孙甲鹏1,韩 静2,方 亮3
2017年第11期
摘要
引用本文
摘 要:在建立混凝土空心砌块非稳态导热-自然对流-辐射多模式耦合传热模型基础上,研究了基于稳态热优化的混凝土空心砌块在徐州地区采暖期的非稳态周期传热特性;分析了空心砌块温度场、热流率随时间的变化规律。定义了非稳态周期传热条件下混凝土空心砌块保温性能评价参数—失热量,并与常用的保温性能评价参数—等效导热系数对比。结果显示,非稳态周期传热时空心砌块优化的效果并没有等效导热系数表征的优越;因此,在空心砌块的设计中应该重视非稳态传热的重要性。 Abstract: The multi-model unsteady heat transfer model of concrete hollow brick was established to investigate the unsteady periodic heat transfer performance of the optimal concrete hollow brick in heating periods of Xuzhou. The change rule of the temperature field and heat flux with the time was analyzed. A new parameter of the losing heat was defined under unsteady periodic heat transfer to evaluate the thermal insulation property of concrete hollow brick, comparing with the equivalent thermal conductivity. The results show that the optimized degree minimizing equivalent thermal conductivity weakens unsteady periodic heat transfer. The present results emphasize the significance of the unsteady heat transfer on designing the concrete hollow brick.
孙甲鹏,韩静,方亮.混凝土空心砌块多模式非稳态周期传热特性[J].混凝土与水泥制品,2017(11):70-73. SUN J P, HAN J ,FANG L.Muti-model Unsteady Periodic Heat Transfer Performance of Concrete Hollow Brick[J].China Concrete and Cement Products,2017(11):70-73.
原材料配比对金属尾矿免烧砖抗压强度的影响
原材料配比对金属尾矿免烧砖抗压强度的影响
  • 代文彬1,2,陈旭峰1,苍大强2
2017年第11期
摘要
引用本文
摘 要:大量利用金属尾矿资源,既能减少对生态环境的影响,还可生产满足京津冀地区工程建设需求的建筑材料,具有低碳绿色的显著特征。本文以承德地区金属钼尾矿和石屑为主要原料,以水泥和粉煤灰为胶结材料,采用半干法压制成型工艺,生产混凝土免烧砖制品,研究了各原材料配比对免烧砖抗压强度的影响。试验结果显示:①免烧砖较适宜的原材料配合比为15%水泥、18%石屑、11%粉煤灰和56%钼尾矿;②水泥含量对免烧砖抗压强度具有非常显著性影响,而粉煤灰、石屑、脱硫石膏影响不显著;③减少石屑细粒比例,或掺加铁尾矿替代部分石屑,均能小幅提高试块的抗压强度;④掺加Na2SO4或NaCl早强剂能提高免烧砖强度,而掺加1.0% Na2SO4较合适。 Abstract: With utilizing metal tailing resources in large quantity, its ecological impact on the environment will be reduced and besides, related building materials meet the requirement for Beijing-Tianjin-Hebei region market can be produced, both of which has a remarkably green and low carbon character. A kind of concrete based baking-free bricks is introduced, which are made of molybdenum tailings and stone chips as the main raw materials, and cement and fly ash as the cementing materials, with the method of half-dry pressing molding process. The compressive strength of these bricks is investigated with various composition of raw materials. Results show that: ①the appropriate weight ratio of raw materials is 15% cement, 18% stone chips, 11% fly ash and 56% molybdenum tailings; ②the cement content has significant influence on the compressive strength of the baking-free brick, while fly ash, stone chips and desulfurization gypsum have no significant influence; ③decreasing the fine particle proportion of stone chips, or replacing partial them by iron tailings, the compressive strength will be decreased in a slightly growing rate; ④with addition of the early strength agent like Na2SO4 or NaCl, the compressive strength will be enhanced, and the appropriate ratio is 1.0% of Na2SO4.
代文彬,陈旭峰,苍大强.原材料配比对金属尾矿免烧砖抗压强度的影响[J].混凝土与水泥制品,2017(11):64-69. DAI W B, CHEN X F ,CANG D Q.Effects of Raw Materials Ratio on Compressive Strength of Baking-free Brick with Metal Tailing[J].China Concrete and Cement Products,2017(11):64-69.
两端开口式新型保温承重砌块砌体抗剪强度试验研究
两端开口式新型保温承重砌块砌体抗剪强度试验研究
  • 王 剑1,孙 莉1,温佳斌1,吴 冬1,孙伟民2,何 可2
2017年第11期
摘要
引用本文
摘 要:通过对八组72个试件两端开口式新型保温承重砌块砌体抗剪试验研究,分析了新型保温承重砌块砌体受剪破坏特征,考察了薄层砂浆和销键对该砌块抗剪强度的影响;研究了外墙砌块的外保温层部分对试件抗剪性能的影响,在此基础上,探讨了内、外墙新型保温承重混凝土砌块砌体的抗剪强度计算公式,根据现行砌体规范提出了建议计算方法,为其在实际工程中的应用及规程的编写提供基本理论和试验依据。 Abstract:The experimental study of shear strength was carried out by 8 groups ( 72 shear specimens ) of open-ended new type compound insulation concrete block masonry. The shear failure characteristics of a new type of thermal insulation bearing block masonry was analyzed, the influence of thin layer mortar and pin on the shear strength of the block was investigated, the influence of external thermal insulation layer of exterior wall block on shear performance of specimens was studied. The shear strength calculation formula of new type thermal insulation load-bearing concrete block masonry of internal and external wall was proposed, and the calculation method according to the existing masonry standard was put forward, which provides the basic theory and experimental basis for its application in practical engineering and the compilation of rules.
王剑,孙莉,温佳斌,等.两端开口式新型保温承重砌块砌体抗剪强度试验研究[J].混凝土与水泥制品,2017(11):58-63. WANG J, SUN L, WEN J B,et al.Experimental Study on Shear Strength of Open-ended New Type Compound Insulation Concrete Block Masonry[J].China Concrete and Cement Products,2017(11):58-63.
碳纤维改善沙漠砂混凝土收缩裂缝试验研究
碳纤维改善沙漠砂混凝土收缩裂缝试验研究
  • 冯 娜1,2,张丽芝1,王佳龙3
2017年第11期
摘要
引用本文
摘 要:通过正交试验,分析了粉煤灰掺量、碳纤维掺量、沙漠砂替代率对沙漠砂混凝土28d抗压强度、劈裂抗拉强度、拉压比的影响,揭示的粉煤灰掺量、碳纤维掺量、沙漠砂替代率对沙漠砂混凝土28d抗压强度、劈裂抗拉强度、拉压比的影响规律;通过对比试验,采用与混凝土抗压强度等性能试验相同的配比,测定了基准混凝土、掺沙漠砂混凝土、正交试验最优组的1d、3d、7d、14d、28d、45d、60d收缩率,结果表明碳纤维对沙漠砂混凝土各龄期干燥收缩具有很好的抑制作用。 Abstract: The orthogonal experiment is carried out to analyze and study the influence of fly ash content, carbon fiber content, desert sand replacement ratio on the 28d compressive strength, splitting tensile strength, tension and compression ratio of desert sand concrete. Based on the comparative test, using the same mix proportion as compressive strength of concrete,the shrinkage rate of the normal concrete, desert sand concrete and orthogonal test optimal group for 1d, 3d, 7d, 14d, 28d, 45d and 60d were tested. The experimental results show that carbon fiber has a good inhibition on the shrinkage of desert sand concrete at different ages.
冯娜,张丽芝,王佳龙.碳纤维改善沙漠砂混凝土收缩裂缝试验研究[J].混凝土与水泥制品,2017(11):54-57. FENG N, ZHANG L Z, WANG J L.Experimental Study on Improving the Shrinkage Crack of Desert Sand Concrete with Carbon Fiber[J].China Concrete and Cement Products,2017(11):54-57.
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