Preparation and Performance Analysis of Ceramsite Asphalt Mixture with Phase-Change Material

Abstract

In this paper, phase-change material (PCM) and ceramsite were used to increase the heat resistance of the asphalt mixture. The ceramsite asphalt mixture with PCM can bring a specific cooling effect to the road surface and alleviate the rapid deterioration at high temperature. Two phase-change materials, PCM-43 and PCM-48, were compared and selected as the heat absorption material of the asphalt mixture. It is found that PCM-43 has better thermal stability, temperature regulation performance, higher enthalpy value, and a less adverse effect on the rheological properties of asphalt. According to the road performance of the asphalt mixture, it suggests that the maximum content of ceramsite is 40%. The specific heat capacity of asphalt mixtures was studied by the method of the insulation bucket test, and the thermal conductivity coefficient of asphalt mixtures was tested by a thermal conductivity instrument. The results show that the specific heat capacity and thermal conductivity of the asphalt mixture can be reduced by adding PCM and ceramsite. The effect of ceramsite asphalt concrete with PCM on the temperature field of road structure was further analyzed by finite element method. Due to the thermal resistance of ceramsite in the upper layer, the cooling range and depth in the middle and lower surface layers can be improved. Meanwhile, the heat absorption of phase-change material can alleviate the heating phenomenon of the upper layer. Therefore, ceramsite asphalt concrete with PCM is effective for decreasing the high temperatures in the asphalt pavements.

Advancements in Phase Change Materials in Asphalt Pavements for Mitigation of Urban Heat Island Effect: Bibliometric Analysis and Systematic Review

“…The particle sizes of PCM, an aspect key to leakage risk (pointed out in Table A2 ) and thermal performance, have been studied extensively. The PCM in Table A1 exhibit a wide range, from a minuscule 0.0002 mm [ 45 ] to a larger 9.5 mm [ 37 , 46 ], with an average particle size of 1.27 mm. In the case of common materials such as PEG2000 and PEG4000, the average particle sizes are 0.4 and 0.6 mm, respectively.…”

“…Conversely, PCM with higher melting points around 50 °C to 60 °C, such as types PEG1000 to PEG8000 [ 12 , 13 , 25 , 26 , 35 , 36 , 37 , 40 , 42 , 62 ], OP55E [ 63 ], stearic acid (SA) [ 11 , 64 ], PCM-43 and PCM-48 [ 46 ], and ceresin wax [ 65 ], could be employed in high-temperature thermal energy storage applications. These are particularly suitable for tropical and temperate locales where summer temperatures can get excessively high, posing a risk to the mechanical integrity of asphalt material.…”

“…To meet these demands, the following materials are good possibilities for some applications: Stearic acid (SA) [ 11 , 32 , 64 , 69 , 70 ]—enthalpy of fusion = 159.6–221.6 J/g; melting point = 40–80 °C. It has a high fusion enthalpy, and the melting point is within a reasonable range for different climates; PCM-43 [ 46 ]—enthalpy of fusion = 210 J/g; melting point = 43 °C. This material has an even higher fusion enthalpy, but its melting point is high.…”

“…PCM-43 [ 46 ]—enthalpy of fusion = 210 J/g; melting point = 43 °C. This material has an even higher fusion enthalpy, but its melting point is high.…”

Assessment of Thermal Performance of Phase-Change Material-Based Multilayer Protective Clothing Exposed to Contact and Radiant Heat

“…For decades, PCMs, due to their useful properties, have been widely used as heat accumulators in installations using renewable energy sources (in particular solar radiation energy-photovoltaic modules) [4][5][6][7]; heat insulators in structural elements of buildings [8][9][10][11][12][13]; temperature stabilizers of food products or medicines (isothermal containers) [14][15][16]; temperature stabilizers of road surfaces [17][18][19]. The use of these materials in multilayer wall structures results in a reduction in daily temperature amplitudes inside the building and a delay in releasing the stored heat.…”