偏高岭土的研究现状及展望

简要介绍了偏高岭土的反应机理和在国内外的研究现状。同时对偏高岭土的研究进行了展望 ,提出因麦特林水泥原料丰富 ,污染小 ,加工简单 ,性能优越 ,其应用前景广阔 ,应对其加强研究。     

Mineralogy and thermal analysis of natural pozzolana opal shale with nano-pores

Thermodynamic stability, microvoid distribution and phases transformation of natural pozzolana opal shale(POS) were studied systematically in this work. XRD analysis showed that opal-CT, including microcrystal cristobalite and tridymite, is a major component of POS. DTA and FT-IR indicated that there were many hydroxyl groups and acid sites on the surface of amorphous SiO_2 materials. FE-SEM analysis exhibited amorphous SiO_2 particles(opal-A) covering over stacking sequences microcrystal cristobalite and tridymite. Meanwhile, MIP analysis demonstrated that porosity and pore size distribution of POS remained uniform below 600 ℃. Because stable porous microstructure is a key factor in improving photocatalyst activity, POS is suited to preparing highly active supported.     

Preparation and properties of PMMA modified silica aerogels from diatomite

Diatomite was used as raw material to prepare sodium silicate with a modulus of 3.1 by alkalidissolution method and the resulted sodium silicate solution was employed as a precursor. Methyl methacrylate monomers were introduced in wet gels through solution-immersion, and upon heating at 70 ℃, the mesoporous surfaces throughout the skeletal framework were coated with the polymer layer. PMMA modified silica aerogels were successfully synthesized via ambient pressure drying. The properties were investigated by FTIR, NMR, TGA, nitrogen adsorption-desorption, FESEM and nano-indentation, etc. Results indicate that with the increasing of PMMA incorporated into silica aerogels, the bulk density and the BET surface area increase, the porosity decreases. Through the observation of FESEM, it is found that the interconnecting pores and the big pores add, the pore size distribution expands from 5-17 to 28-150 nm. By comparison, the PMMA modified silica aerogels achieve a 52-fold increase in hardness and a 10-fold increase in modulus.     

碳纳米管改善水泥基材料性能的微观机理

碳纳米管由于其优异的性能,正迅速成为一种最有应用前景的纳米材料,对其改善水泥基复合材料的研究也成为纳米材料领域的热点。详细综述了碳纳米管通过纤维桥联、纤维拔出、网络填充改善水泥基复合材料性能的微观机理及研究进展,为其宏观性能提供了理论解释。     

辽宁省粉煤灰资源综合利用发展规划研究

本文在综合调研基础上,详细分析了辽宁省建国以来粉煤灰资源特点,粉煤灰综合利用现状,并进一步论述了今后粉煤灰综合利用的发展方向及发展重点,进而提出了未来加强粉煤灰综合利用工作所应采取的对策措施。     

某大桥分联处桥墩设计技术分析研究

介绍了承(德)秦(皇岛)出海公路双牛段南寨大桥分联处桥墩的设计情况,从结构计算和设计理论方面分析了设计的思路,对设计的效果进行了评价,对设计中的经验和教训进行了总结。     

"土木水利学科前沿实验"课程的构建与实践

大连理工大学土木水利实验教学中心以教育部"质量工程"中的国家级实验教学示范中心建设为契机,以校长欧进萍院士倡导的"实施精英教育培养精英人才"的理念为指导,以土木工程和水利工程国家级优势学科为支撑,积极推进实验教学改革,面向一年级本科生在土建类国家级实验教学示范中心中率先开设了"土木水利学科前沿实验"实验课程.本文对该课...     

粉煤灰资源的综合利用研究

粉煤灰是从煤粉炉排出的烟气中收集到的细颗粒粉末,是工业“三废”之一。作为具有潜在资源属性的工业废渣,研究粉煤灰的综合利用具有重大意义。介绍了粉煤灰在建筑材料、废水废气处理、高分子制品等领域的综合利用现状,并对其今后在各领域的深入研究与应用作了展望。     

砂石骨料含泥量现场快速测定方法

阐述了水工混凝土中砂石骨料含泥量超标后对混凝土造成的危害;说明了砂石骨料含泥量在水工施工中的技术要求;砂石骨料含泥量的检验方法;结合现场状况,分析了水工混凝土中砂石骨料含泥量快速测定的过程.提出了消除砂石中泥土的几项措施,得出砂石骨料含泥量一定要严格控制的结论.     

建筑垃圾处理及应用研究进展

目前城市化进程不断加快,建筑业发展迅猛,建筑垃圾的产生量十分巨大,合理地处理和应用建筑垃圾已经成为严峻的环境、生态问题。本文介绍了一些国家和地区对建筑垃圾处理与应用方面的最新研究成果,并分析和讨论了目前建筑垃圾综合处理方面存在的一些问题,为建筑垃圾的进一步研究提供了参考意见。