石灰粉煤灰材料做路面结构层已在高速公路工程中普遍应用。随着燃煤电厂的发展,粉煤灰排量的相应增加,利用石灰、粉煤灰稳定粒料做路面结构层这一技术也应用得越来越多,石灰粉煤灰碎石(简称二灰碎石)已成为目前修建高速公路路面基层普遍应用的一种结构形式。实践和研究表明,二灰碎石的水稳性和板体性均较好,其强度和整体性随龄期增长而增加,二灰碎石做路面基层,还可节省材料,降低工程成本,同时,做到了就地取材、综合利用,具有较好的经济和社会效益。 一、原材料的选用 1、石灰 生石灰的质量要求不低于规范规定的Ⅲ级石灰的技术指标,使用前应充分消解,且对消解后的石灰进行过筛,(最好在施工前一周消解),以防止活性氧化物(钙、镁)含量的下降,如氧化物含量在试验时发现下降,则应适当增加石灰的用量,我们采用的消石灰CaO+MsO含量 Lime fly ash material pavement structure layer has been widely used in highway engineering. With the development of coal-fired power plants, a corresponding increase in fly ash displacement, the use of lime, fly ash stabilized aggregate pavement structure of the technology is also applied more and more lime-stone fly ash (referred to as two Gray gravel) has become the current construction of highway pavement grassroots general structure of a form. Practice and research have shown that lime-fly ash gravel has better water-stability and board-body properties, its strength and integrity increase with age, and lime-fly ash gravel makes the pavement base. It also saves materials and reduces construction cost, At the same time, we have achieved local economic benefits and social benefits through comprehensive utilization. First, the selection of raw materials 1, Lime lime quality requirements of not less than the specification of the technical indicators of grade Ⅲ lime, should be fully digested before use, and the digested lime after screening, (preferably in the week before construction digestion) , In order to prevent the decline of the active oxide (calcium, magnesium) content, such as the oxide content found in the test decreased, you should appropriately increase the amount of lime, we use the slaked lime CaO + MsO content