共查询到20条相似文献,搜索用时 15 毫秒
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研究了Cu-Mn脱硫剂的还原,脱硫及再生性能。该脱硫剂在实际应用中无需进行还原过程,且不仅显示较强的脱硫性能和较高的硫容量,而且在8000℃的高温下仍能保持这些特性。 相似文献
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Hazelnut husk is a renewable natural resource that has not industrial utilization yet. The objective of this study was to examine some chemical properties (holocellulose, cellulose, lignin and ash contents, alcohol–benzene, hot and cold water solubility and solubility in dilute alkali (1% NaOH)) of hazelnut husk and to evaluate its suitability to produce composite panels. For this study, particleboards were produced using hazelnut husk as an alternative raw material for the forest products industry. Two panel density levels (0.6 and 0.7 g/cm3) and three types of resins (urea-formaldehyde (UF), phenol formaldehyde (PF), melamine-formaldehyde (MUF)) were selected as treatments. The findings indicated that hazelnut husk waste is a valuable renewable natural resource for particleboard production and could be utilized as a substitute for wood in board production. Its shortcomings, such as higher water absorption and thickness swelling could easily be controlled by adding water repellent chemicals in production. The bending and the internal bond strength properties of the hazelnut husk boards produced met the requirement for the general purpose product standards (TS-EN 312-2) at 0.70 g/cm3 density. 相似文献
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通过对杭州城西软土土性物理力学指标的统计分析,研究了土性沿深度的变化情况,分析了城西软土的工程特性,总结了城西软土对工程建设的主要危害,为该地区工程建设提供一定理论依据及经验参考。 相似文献
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混杂纤维在混凝土中的应用 总被引:6,自引:0,他引:6
综述了混杂纤维混凝土的纤维混杂类型、混杂纤维混凝土的施工性能、力学性能、抗收缩性能、抗渗物理性能。现有的试验研究报告表明:混杂纤维因其混杂类型的不同使得对混凝土抗压强度的影响有所差异;但是对混凝土的抗拉、抗折强度有明显提高,且可以起到良好的增韧作用;对混凝土抗收缩性能和抗渗性能也有明显的提高和改善。 相似文献
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İsmail Dinçer Altay Acar Suphi Ural 《Bulletin of Engineering Geology and the Environment》2008,67(3):353-366
The aim of this study was to develop and evaluate statistical models for predicting the uniaxial compressive strength (UCS)
and average Young’s modulus (E
av) for caliches, using some index and physical properties. The caliche samples, from Adana, southern Turkey, were of low strength
and difficult to sample. X-ray diffraction and microscopy were undertaken and the following physical parameters established:
unit weight, apparent porosity, Schmidt rebound number, Shore hardness, P-wave velocity, slake durability, point load, uniaxial
compressive strength and average Young’s modulus. Simple and linear regression variable selection analyses were performed.
The best relationships were obtained for UCS with P-wave velocity and unit weight and for average Young’s modulus with P-wave
velocity, porosity and slake durability. Empirical equations are proposed, although it is emphasised that these may only be
applicable for caliche of a similar geological character.
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为使超高性能混凝土能够更广泛地应用于建筑工程中,通过优选水泥品种、矿物掺合料、钢纤维掺量等,制备出符合工程应用要求的超高性能混凝土。从工作性能、流变性能、力学性能和体积稳定性方面对制备出的超高性能混凝土进行了测试,结果符合相关要求,研究成果可为超高性能混凝土的常规工艺制备提供参考。 相似文献
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通过实验,对再生骨料的物理性能做了研究,分析了其与天然骨料产生差别的原因,并对再生混凝土的基本力学性能进行了再研究,与天然混凝土作对比后,指出配制混凝土时天然骨料可被再生骨料部分取代配得满足强度要求的混凝土材料,达到节约骨料资源,废物再利用的目的。 相似文献
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Hasan Arman Sefik Ramazanoglu Akin Akinci 《Bulletin of Engineering Geology and the Environment》2007,66(3):331-333
Kandira stone, extensively used for building stone in northwest Turkey, consists of approximately 91% calcium carbon and 9%
clay minerals. The mechanical and physical properties are reported. It is of note that the Brazilian strength is approximately
one quarter of the unconfined compressive strength.
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为探究温度对煤岩静、动态力学特性的影响规律,首先采用箱式氛围炉在准真空环境下对直径50 mm,高度分别为100和50 mm的2组无烟煤试样进行8种温度水平的热处理(20℃~500℃),然后分别利用液压伺服试验机和分离式Hopkinson压杆对2组试样进行静态单轴压缩和动态冲击试验。此外,还通过扫描电镜和压汞试验获得各种温度后煤样的SEM图像、孔隙率及孔径分布。结果表明,煤样热损伤以300℃为界分为2个阶段,分别以解吸、热破裂等物理反应和热解化学反应为主,孔隙率逐步变大且中大孔占比逐渐增加;煤岩承载和抗变形能力都随温度升高而逐步劣化,第二阶段衰减趋势较第一阶段急剧,500℃后的静、动态抗压强度分别降至常温时的8.41%和16.94%。静载条件下煤样宏观力学性能的温度敏感性比动态冲击时显著,抗压强度和弹性模量的动态增强因子随温度的变化规律不一致。 相似文献
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简要描述了广泛分布于贵州省六盘水地区红黏土的成因、基本物理力学性质,并结合工程实例评述确定红黏土的地基承载力的几种方法,指出红黏土具有良好的力学性能,是良好的地基土. 相似文献
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研究了原状水淬矿渣代砂对新拌混凝土及硬化混凝土性能的影响。结果表明,矿渣代砂后混凝土工作性能变差;在相同坍落度下,矿渣代砂混凝土的泌水率更大,坍落度损失更快。对于同水灰比混凝土,其抗压强度和抗折强度随代砂率的提高而增大,且随养护龄期的增加,提高幅度加大;矿渣代砂后,混凝土的弹性模量也有一定程度的增长;矿渣代砂混凝土抗硫酸盐侵蚀的能力与普通混凝土差别不大。 相似文献
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总结了钢管混凝土结构在国内外的发展状况。阐述了钢管混凝土结构的发展历史、结构特点和研究现状。最后阐述了其在桥梁工程、地下工程、高层建筑空间结构等方面的应用状况。 相似文献