Abstract
In order to explore the construction performance of zeolite asphalt mixture, the microproperties of zeolite and the macroproperties of zeolite asphalt mixture were studied. The structure composition, surface properties, and pore characteristics of zeolite were analyzed by infrared spectroscopy and pressure pump method. The structure, composition, and thermal stability of zeolite were analyzed by differential scanning calorimetry and thermogravimetry, the mechanism of moisture absorption and loss of water was explored, and the properties of moisture absorption and loss of water were studied. The effect of the type and amount of zeolite on the viscosity of asphalt was studied by the viscosity test. According to the mixing current and the compaction void ratio, the influence of zeolite on the construction performance of zeolite asphalt mixture was studied. The results show that zeolite contains special zeolite water and the pore content of zeolite is much higher than that of mineral powder. Zeolite loses water at 90°C∼120°C, which is the necessary condition for zeolite to be used in warm mix asphalt mixture. The water absorption and loss capacity of zeolite mainly depend on pore volume. The larger the pore volume is, the stronger the water holding capacity of zeolite is. Meanwhile, the water holding capacity and loss capacity of zeolite are related to pore size distribution. According to the viscosity temperature equation, the mixing and compaction temperature of the asphalt mixture are determined. The mixing and initial pressure temperature of the zeolite asphalt mixture are lower than those of the hot asphalt mixture. Based on the principle of mixing current equivalence, the mixing temperature of zeolite asphalt mixture can be reduced by 20°C compared with that of hot asphalt mixture. The better the water loss performance of zeolite is, the easier the mixture is to be compacted. For the base asphalt mixture, the compaction temperature of the mixture is 120–130°C, and, for the modified asphalt mixture, the compaction temperature is 130–140°C.
Highlights
Under the premise of ensuring the mechanical performance and durability, warm mix asphalt mixture can effectively reduce the construction temperature and mixing temperature, reduce the emission of harmful gases in the construction process, the energy consumption in the construction, and reduce the aging of asphalt. erefore, warm mix asphalt mixture conforms to the green traffic concept and is widely used in road construction [1,2,3]
Handayani et al [16] studied the performance of asphalt mixture with natural zeolite. rough the Marshall test, it was found that when the content of natural zeolite was 1%, the mixing temperature and compaction temperature of polymer modified asphalt mixture could be reduced by 30°C, which was lower than the mixing temperature of zeolite-free polymer modified asphalt mixture
Sol-Sanchez[19] prepared two kinds of warm mix asphalt with two different types of zeolite waste as additives and compared with the mechanical properties of conventional warm mix asphalt and hot mix asphalt; it was found that the zeolite waste with lower particle size has higher water absorption capacity and 0.3% of the content allows the production of warm mix asphalt at 145°C and has the same workability as traditional
Summary
Under the premise of ensuring the mechanical performance and durability, warm mix asphalt mixture can effectively reduce the construction temperature and mixing temperature, reduce the emission of harmful gases in the construction process, the energy consumption in the construction, and reduce the aging of asphalt. erefore, warm mix asphalt mixture conforms to the green traffic concept and is widely used in road construction [1,2,3]. Sol-Sanchez[19] prepared two kinds of warm mix asphalt with two different types of zeolite waste as additives and compared with the mechanical properties of conventional warm mix asphalt and hot mix asphalt; it was found that the zeolite waste with lower particle size has higher water absorption capacity and 0.3% of the content allows the production of warm mix asphalt at 145°C and has the same workability as traditional. Rough dynamic shear rheometer (DSR), the mechanical tests of tensile strength (TS), resilient modulus (RM), dynamic creep (DC), and tensile strength (POTS) of modified asphalt mixture showed slight positive difference It can be seen from the above research that zeolite, as a kind of warm mixture, plays a significant role in reducing the construction temperature. Erefore, this paper starts from the microperformance of zeolite, analyzes the structure and performance differences between zeolite and mineral powder, and analyzes the construction performance differences between zeolite asphalt, zeolite asphalt mixture, and hot mix asphalt mixture
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