Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (1): 180-187.doi: 10.13229/j.cnki.jdxbgxb.20220232

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Laboratory investigation on cooling effect of multi-layer phase change asphalt concrete

Jun CHEN1(),Zhen-hao SUN1,Cheng ZHAO1,Xin-yi WU2,Jun-peng WANG1   

  1. 1.College of Civil and Transportation Engineering，Hohai University，Nanjing 210098，China
    2.School of Energy and Environment，Southeast University，Nanjing 211189，China
  • Received:2022-03-09 Online:2024-01-30 Published:2024-03-28

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Abstract:

To investigate the cooling effect of multi-layer phase change asphalt concrete structure， the phase transition temperatures of five groups of polyethylene glycol （PEG） with different molecular weights were measured by differential scanning calorimetry. Seven groups of three-layer composite asphalt concrete slabs containing PEG were prepared based on the simulation results of asphalt pavement temperature field under solar radiation. The internal temperature of these composite asphalt concrete slabs within 9 h of thermal radiation was measured using the self-developed thermal radiation and temperature measurement device. And the effects of PEG addition layer， combination of PEG addition layer and molecular weight on the heat storage and cooling of composite asphalt concrete slabs were analyzed. Results show that the starting temperature of phase transition increases from 25.1 ℃ to 54.4 ℃ with the molecular weight of PEG increasing from 1000 to 6000. The cooling effect is mainly reflected in the mixing layer and its lower layers when phase change material was added to the single layer of pavement structure. The scheme of adding PEG in the upper layer is better than that of using PEG in multiple layers from cost performance. The cooling effect of PEG with high molecular weight is better than that of PEG with low molecular weight at the same content.

Key words: road engineering, asphalt concrete, phase transition, composite structure, cooling effect, polyethylene glycol

CLC Number: 

  • U414

Fig.1

DSC and TG test results of PEG with different molecular weight"

Fig.2

Appearance of PEG-6000/SiO2 particles"

Table 1

Rheological properties of SBS modified asphalt"

针入度/mm软化点/℃5 ℃延度/cm60 ℃动力粘度/（Pa·s）
5889.234.337 683

Table 2

AC-13， AC-20， and AC-25 mix design"

材料不同筛孔尺寸（mm）的通过率/%沥青 用量/%
31.526.5191613.29.54.752.361.180.60.30.150.075
AC-1310010010010093.780.755.439.922.517.912.28.97.05.1
AC-2010010093.887.672.863.144.228.319.715.411.88.06.34.7
AC-2510097.979.076.066.056.037.525.517.012.09.56.55.04.4

Fig.3

Ambient temperature and radiation intensity in simulation"

Table 3

Thermophysical parameters of pavement materials［20］"

材料厚度/cm密度/（kg·m-3）比热容/［J·（kg·K）-1］导热率/［W·（m·K）-1］
AC-134250010701.30
AC-206245010601.25
AC-258240010501.20
水泥稳定碎石57255010001.10
砂石25250010001.10
土壤200260010600.95

Fig.4

Simulation results of pavement temperature field"

Table 4

Eight groups of asphalt mixture composite structure"

层位8组复合结构内PEG的分子量
ABCDEFGH
AC-13 （4 cm）/6000//6000600060004000
AC-20 （6 cm）//2000/2000/20001500
AC-25 （8 cm）///1500/150015001000

Fig.5

Preparation of three-layer asphalt concrete composite structure"

Fig.6

Temperature collector of phase change concrete during thermal radiation"

Fig.7

Light radiation intensity during irradiation"

Fig.8

Cooling effect of PEG mixed into upper layer， middle layer， and lower layer"

Fig.9

Cooling effect of PEG mixed into upper layer （B）， upper and middle layer（E）， upper and lower layer （F） and upper， middle and lower layer（G）"

Fig.10

Cooling effect of PEG with different molecular weight mixed into asphalt layer"

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