城市道路生态型薄层层间黏结设计与研究

Design and Research on Ecological Thin-layer Interlayer Bonding of Urban Road

摘要:

随着城市交通道路的发展，预防性养护得到很大的重视，其中薄层是一种高效且具有性价比的方式。针对当前热拌薄层污染严重，且施工性能较差等问题，基于冷拌冷铺技术的生态型薄层的方式开始进入研究者的视野。由于沥青未经过高温，生态薄层的黏结性能是重点。为改善生态型薄层罩面层间黏结性能，进一步提高薄层罩面的养护寿命，对3种不同的层间黏结材料进行研究试验，具体包括70号基质沥青、SBS改性沥青和水性环氧乳化沥青。试验方法采用MTS拉拔试验，通过3种不同黏结材料不同洒布量下的拉拔力、黏结强度，评价其作为层间材料的黏结性能。试验结果表明，除了0.6 kg/m2及以下洒布量的基质沥青之外，其他方案均能够满足较为苛刻的黏结强度值不小于1 MPa的要求，整体黏结性能较好的材料为水性环氧乳化沥青，洒布用量取0.6kg/m2和0.8 kg/m2时，水性环氧乳化沥青黏层材料和SBS改性沥青黏层材料的层间拉拔强度可达最佳又能保证性价比优秀。

关键词:薄层罩面;层间黏结;沥青材料;拉拔强度

Abstract:

With the development of urban traffic road, the preventive maintenance has received the great attention, in which the thin layer is an efficient and cost-effective way. In view of the serious pollution and poor construction performance of the current hot mixed thin layer, the ecological thin layer based on the cold mixed and cold paved technology has begun to enter the vision of researchers. Since the asphalt has not been subjected to high temperature, the bonding performance of the ecological thin layer is the key point. In order to improve the bonding performance between the layers of the ecological thin layer overlay and further improve the maintenance life of the thin layer overlay, three different interlayer bonding materials are studied and tested, mainly including 70# matrix asphalt, SBS modified asphalt and water-based epoxy emulsified asphalt. The MTS pull-out test is used to evaluate the bonding performance of three different bonding materials as interlayer materials through the pull-out force and bonding strength under different spraying amount. The test results show that except for the base asphalt with the spraying amount of 0.6 kg/m2 or less, the other schemes can meet the more stringent requirements of the bonding strength not less than 1 MPa. The material with good overall bonding performance is water-based epoxy emulsified asphalt. When the spraying amount is 0.6 kg/m2 and 0.8 kg/m2, the interlayer pull-out strength of water-based epoxy emulsified asphalt tack coat material and SBS modified asphalt tack coat material can reach the best and ensure the excellent cost performance.

Key words:thin overlay; interlayer bonding; asphalt material; pull-out strength