聚酯玻纤布防反射裂缝的施工工艺和质量控制研究

聚酯玻纤布是一种效果优良的防反射裂缝的材料,但施工工艺复杂,施工质量难以控制。结合某高速公路试验段的实践,对聚酯玻纤布施工工艺和质量控制进行系统研究,可供相关项目施工时参考。     

纤维补强膨胀混凝土在道路建设中的应用

研究表明,聚丙烯纤维和嘭胀剂的复合效应,改善了混凝土的变形性能,抑制了混凝土结构形成过程中导致缺陷的因素,提高了混凝土结构的均匀性和连续性,进而改善了混凝土的物理力学性能,增强了耐久性。     

Experimental Study on the Compressive Behavior of CFRP/ECCs

In this study, nine square concrete columns, including six CFRP/ECCs and three plain concrete control specimen columns, were prepared. The CFRP tubes with fibers oriented in the hoop direction were manufactured with 10, 20, or 40 mm rounded corner radii at vertical edges. A 100 mm overlap in the direction of fibers was provided to ensure a proper bond. Uniaxial compression tests were conducted to investigate the compressive behaviors including the axial strength, stress-strain response, and ductility. It is evident that the CFRP tube confinement can improve the compressive behavior of concrete core, in terms of axial compressive strength or axial deformability. Based on the experimental results and some existing test database attained by other researchers, a design-oriented model is developed. The predictions of the model for CFRP/ECCs show good agreement with test results.     

玄武岩纤维沥青混合料试验研究

玄武岩纤维在我国的生产和应用尚处于起步阶段,玄武岩纤维在沥青混凝土加筋方面的机理研究尚未引起足够的重视。对车辙、低温弯曲等的试验研究,可以为玄武岩纤维在沥青混凝土路面中的应用提供参考,对于我国公路路面使用寿命的延长具有一定的研究和应用价值。     

梅河高速公路水泥混凝土路面建设新技术

广东梅河山区高速公路路面结构上使用了全线碎石垫层,解决差异沉降;用透层油、沥青封层加石屑解决冲刷破坏。梅河高速公路是我国建设里程最长（118．41km）的采用滑模摊铺机自动（DBI）对每条横缩缝插入传力杆的混凝土路面。国内外首次采用高位非对称滑模连续摊铺混凝土路面与双钢混凝土桥面。国内首次零位滑模摊铺了6座隧道5843m钢纤维混凝土路面。克服了高温天高温水泥条件下的滑模施工难题。     

Adsorption models and structural characterization for activated carbon fibers

The nitrogen adsorption isotherms at 77.69 K were measured for two samples of activated carbon fibers and their microstructures were investigated. Among established isotherm equations, the Dubinin-Radushkevich equation showed the best agreement with the experimental data, while the Langmuir equation showed a large deviation when employed at low relative pressures. The MP method, t-method and αs-method were used to analyze the pore size distribution. The calculated average pore widths and BET (Brunauer-Emmett-Teller) surface areas for the sample A-13 were 0.86 nm and 1 286.60 m2/g, while for the sample A-16, they were 0.82 nm and 1 490.64 m2/g. The sample with larger pore width was more suitable to be used as additive in chemical heat pumps, while the other one could be used as adsorbent in adsorption refrigeration systems.     

钢纤维混凝土配合比试验分析

影响铜纤维混凝土强度的因素很多,运用正交试验法对铜纤维混凝土的水灰比、钢纤维体积率、砂率与钢纤维混凝土强度的关系进行讨论,找到适合工程应用的钢纤维混凝土最佳配合比,并采用直观法和方差法对结果进行处理,得到适合工程需要的钢纤维混凝土最佳配合比。     

外掺材料对水泥土强度及渗透性能影响的研究

由于水泥土的经济性及易操作性,其在工程中已经被广泛使用。该文考虑在水泥土中加入聚丙烯纤维及粉煤灰两种外掺材料,研究其对水泥土的抗压和抗渗性能的影响。通过几组室内实验,测定加入外掺材料后水泥土的抗压强度和渗透系数;并在实验基础上给予理论分析和总结。     

碳纤维布加固梁式桥施工探讨

碳纤维质量轻、抗拉强度高、耐腐蚀、抗老化,有着优异的力学性能,用其加固补强混凝土结构施工简单便捷,在桥梁维修加固中得到了广泛的应用。碳纤维加固修补结构技术是继加大混凝土截面、粘贴钢板之后的又一种新型的结构加固技术。在对碳纤维加固梁式桥的机理及受力特点进行介绍的基础之上,就其施工所用材料、施工工艺深入分析,并给出有益的施工建议,对于碳纤维布加固技术的应用推广具有一定的指导意义。     

旧水泥混凝土路面加铺沥青路面的施工技术

玻璃格栅是具有一定延伸性的材料,在处理后的旧水泥混凝土路面上设置玻璃格栅,是防止加铺层沥青路面反射裂缝的一项有效措施。