【作者】 雷雨滋；

【导师】 郑南翔；

【作者基本信息】 长安大学 ， 道路与铁道工程， 2008， 硕士

【摘要】 我国对粉煤灰在公路建设中的运用研究,在技术上已比较成熟。粉煤灰在公路建设中主要用于半刚性基层,半刚性基层是重庆乃至全国高速公路最常使用的基层、底基层结构型式;具有强度高、刚度大的优点,但其收缩裂缝问题至今仍困扰着公路工程界。重庆地区粉煤灰活性较低,在公路建设中很少应用,这对当地环境造成极大得污染。论文依托渝隧高速碎石研究项目,通过对比西安粉煤灰Z,对重庆粉煤灰L和重庆粉煤灰Y在公路半刚性基层中的运用进行了研究。论文介绍了国内外粉煤灰在公路基层中的运用概况和研究现状;通过对粉煤灰激活原理进行分析,针对重庆地区粉煤灰活性普遍较低的特性,使用多种激活方法对粉煤灰活性进行激发。主要通过石灰激发、石灰与激活剂A复合激发、水泥激发、水泥石灰复合激发、水泥与激活剂A复合激发进行结合料强度试验研究;选取有水泥掺加情况下合适比例和石灰、激活剂A情况下的最佳比例和最佳剂量。对几种级配运用贝雷法进行评价,选取合适的级配作为混合料路用性能验证试验的集料级配。对各比例和不同激活剂剂量的结合料应用体积设计法进行混合料配合比设计;对于同一级配下的集料,二灰稳定类采用结合料紧密填充集料空隙,水泥粉煤灰稳定类则采用不同的预留空隙率进行混合料配合比设计。以力学特性(无侧限抗压、劈裂抗拉)、刚度特性、抗冲刷特性、抗裂性(温缩、干缩)为技术指标,考察其诸项路用性能,综合分析确定了粉煤灰在半刚性基层中较好的应用方法。文中运用了灰色系统理论的基本方法,分别对同级配水泥粉煤灰稳定类和二灰稳定类混合料的诸项路用性能进行了综合评价,为重庆地区粉煤灰在高等级路面中的运用提供了有力的依据。更多还原

【Abstract】 The application research of fly ash in china’s highway construction have many years,and the technique has more mature. Fly ash in highway construction mainly used for semi-rigid base, semi-rigid base in highway construction is most commonly used by base or subbase in nation and chongqing,with strength and stiffness of the big advantages,but the problem is that shrinkage cracks still troubled the engineering in hihgway. Chongqing’s fly ash is lower activity, so it is very a few application in highway construction, and the result is that local environment was polluted. The papers relying on Yusui gravel project, the application research in semi-rigid base for Chongqing Luohuang Power Plant and Chongqing Power plant by contrast Xi’an Baqiao fly-ash.Papers presented the use of fly-ash in base at home and abroad; through the analysis for the activation principle of fly ash, because the fly-ash of Chongqing area has lower activity generally, so to stimulate the activity of fly ash with variety of methods. Their are several methods to excite the activity of fly ash, Such as through lime, lime and ativator A, cement, cement and lime , cement and ativator A etc, so as to do binder material strength test. Select a appropriate proportion of cases with cement mixing, and select the best proportion with lime and ativator A.To evaluate several aggregate gradation by Bailey method. Select appropriate gradation as aggregate gradation for mixture road performance in verification test. By void design procedure to design different mixture. For the same gradation of aggregate, lime and fly ash mixture used in close the gap filler aggregate, cement and fly ash mixture with different reserved voidage to design the mixture. Also, by the experiments of mechanical performance (unconfined compression strength, the cleavage strength), Anti-brushing performance and Anti-cracking performance (thermo-contraction , dryness-contraction), and through comprehensive analysis of the fly ash to decide the way of fly ash in semi-rigid application. The paper by using the fundamental method of grey system theory, to evaluate the mixture of the road performance, for the fly ash application in high-grade road for Chongqing area provides a strong basis.更多还原