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PEG/SiO2相变颗粒对沥青混合料储热及高温性能的影响

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Keywords: 道路工程,沥青混合料,等体积取代,相变材料,高温稳定性

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Abstract:

利用相变材料物相转变时吸收或释放大量热量而本身温度保持不变的特性,用溶胶-凝胶法制备PEG/SiO2相变颗粒,并将其以等体积替代法替代粒径小于0.6mm的细集料应用于沥青混合料中。考察了PEG/SiO2相变颗粒对4种不同级配的沥青混合料温度敏感性及高温稳定性的影响。结果表明,PEG/SiO2相变颗粒的掺入可降低沥青混合料的温度敏感性,并且掺量越大效果越明显,当其掺量达到5%时,可在自然光照条件下降温5℃以上,而级配对沥青混合料的温度敏感性影响不明显。PEG/SiO2相变颗粒对沥青混合料的高温稳定性影响与相变颗粒的掺量及沥青混合料的级配类型有关。相变颗粒的掺入在降低沥青混合料最高温度的同时,可降低沥青混合料发生高温车辙病害的可能性。

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