Meso-characterization of cold-mixed and cold-laid wear-resistant layer

The wear-resistant layer of cold-mixed and cold-laid super-viscous fiber is a mixture system composed of cold-mixed and cold-laid mixture, bonding oil, fiber and composite modified emulsified asphalt. The application of this system in road preventive maintenance can increase the service life of roads, improve the overall performance of roads and promote the development of traffic. It is a brand-new preventive maintenance technology with low carbon, environmental protection and strong comprehensive performance, which is very suitable for the maintenance of thin overlay of asphalt or cement concrete pavement at all levels. Key words: preventive maintenance of cold-mixed and cold-paved pavement with super-sticky fiber wear layer. China Picture ClassificationNo.: U4 18 Document IdentificationNo.: A DocumentNo.:1672 379120210/03402 Cold-mixed and cold-laid super-viscous fiber wear-resistant layer technology is a very advanced technology. This technology effectively combines the technical advantages of ultra-thin wear-resistant layer NovaChip and micro-surfacing, and on this basis, two processes of fiber cold mixing and new adhesive layer are added. After scientifically spraying high-viscosity modified emulsified asphalt binder with special equipment for super-viscous wear layer, paving super-viscous mixture mixed with fiber barrier, and then repeatedly rolling to form a brand-new wear layer or intermediate stress absorption layer, which greatly increases its adsorption degree, not only strengthening road synthesis. 1 Project Overview This project is the application research of super-viscous wear layer in highway maintenance project undertaken by Dingxi Highway Administration Bureau and Sujiaoke Group Co., Ltd. After the on-site investigation was completed by both parties, K53+000K59+000 section of National Highway 2 12 was finally selected as the test section of super-sticky wear layer. The construction scheme of this section of super-sticky wear layer was jointly developed by Su Jiaoke Group Co., Ltd. and Jiangsu Yanning New Material Science and Technology. 2. The concrete application of cold-mixed and cold-laid super-viscous fiber wear layer in preventive maintenance 2. 1 Selection of main materials and setting of mixture gradation The main materials of cold-mixed and cold-laid super-viscous fiber wear layer in this project are fast-cracking and fast-setting, slow-cracking and fast-setting cationic modified emulsified asphalt, tap water, basalt and 42.5 ordinary portland cement 1. Finally, the selection of super-viscous wear grade of cold mix and cold paving is shown in table 1. 2.2 Selection of fiber type: air-jet roving glass fiber with Tex parameter of 2400TEXg/km is selected, and fiber coil is selected. The actual diameter of each roll of glass fiber is 300 mm and the thickness is 250 mm; The average fiber consumption is subject to the conventional amount, that is, aggregate 1000kg and glass fiber 0.1%0.3%; During the construction of stress absorption sandwich, it is necessary to increase the dosage appropriately, and the fiber length is 8mm, 12mm and 16mm respectively. Assuming that the aggregate is 06 or 08, and the optical fiber with the length of 12mm is selected, the type of optical fiber disc packaging can be subject to the optical fiber sealing technology. 2.3 There are no special requirements for the selection and application of crushed stones in aggregate types. Limestone, granite and basalt will do. Generally speaking, mixing and classification are designed by international micro-meters. The specific classification is determined according to the traffic volume and building structure of the road section. Aggregate must be clean, and the content of stone powder and soil impurities must be