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復合高膠水性瀝青的製備及其混合料應用研究

Study on Preparation of High Rubber Composite Emulsified Asphalt and Its Mixture Application

  • 摘要: 廢膠粉可改善瀝青的高低溫性能,但經傳統熱拌工藝改性的瀝青🏋🏽‍♂️,因其性能不穩定和氣味問題而被限製廣泛應用。傳統乳化瀝青混合料黏結性差🧑‍🦼👭🏻、高溫強度低、抗水損害能力差,且存在拌和施工可操作性差等問題🍘🧅。將苯乙烯-丁二烯-苯乙烯共聚物復合廢膠粉(復合高膠)改性瀝青水性化🔈,並將其應用於OGFC-13級配透水路面鋪設👶🏿。製備出復合高膠水性瀝青🙈,並對其軟化點🍡、黏度👩🏿‍🍳、力學性能及微觀形貌進行分析🍄。研究了OGFC-13型混合料高低溫性能以及水穩定性能。測試結果表明🫱:采用非離子型乳化劑,乳化時間15 min製備出的乳化瀝青黏結性好🤘🏿,軟化點高🐑♊️,分散均勻且具有良好的力學性能。混合料性能測試表明,當油石比為6.5%時🧒🏿🧚🏻,復合高膠水性瀝青混合料表現出良好的高低溫性能,動穩定度達到5842次/mm,彎曲破壞應變達到3024 μm/m💕、破壞最大荷載為1256 N,凍融劈裂強度比達到80.2%,具有良好的抗水損害能力💙。研究結果有助於廢膠粉的環保資源化綜合利用,並將促進水性瀝青高值化應用↗️,在道路鋪設、養護☄️、建築防水等領域應用前景廣闊。

     

    Abstract: Waste rubber powder can improve the high and low temperature performance of asphalt, but with the traditional hot mixing process, the wide application of modified asphalt is restricted due to its unstable performance and odor problems. The traditional emulsified asphalt mixtures have poor cohesiveness, low high-temperature strength, poor resistance to water damage, and have problems with the operability of mixing construction. The styrene-butadiene-styrene copolymer composited with waste rubber powder (composite with high content of rubber, CHR) modified asphalt was hydrated and applied to OGFC-13 graded permeable pavement. Firstly, a composite high latex emulsified asphalt was prepared, and its softening point, viscosity, mechanical properties and micro morphology were analyzed. The high and low temperature performance and water stability performance of OGFC-13 mixture were studied. The test results show that the emulsified asphalt prepared with a non-ionic emulsifier and an emulsification time of 15 minutes has good cohesiveness, high softening point, uniform dispersion and good mechanical properties. The performance test of the mixture shows that when the ratio of asphalt to stone is 6.5%, the CHR emulsified asphalt mixture exhibits good high and low temperature performance, the dynamic stability reaches 5842 times·mm–1, the bending failure strain reaches 3024 μm/m, and the maximum failure load is 1256 N, the freeze-thaw splitting strength ratio reaches 80.2%, and it has good resistance to water damage. The research results are beneficial to the comprehensive utilization of waste rubber powder in environmental protection and resources, and will promote the high-value application of waterborne asphalt, which has broad application prospects in road paving, maintenance, and building waterproofing.

     

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