高分子添加量對瀝青工程性質之影響

Effect of Polymer Concentration on Engineering Properties of Asphalt Binder

陳建旭(J. S. Chen) ； 蔡攀鰲(P. A. Tsai) ； 蔡長展(C. J. Tsai) ； 廖敏志(M. C. Liao)

《材料科學與工程》 33卷3期 (2001/09) Pp. 125-135

https://doi.org/10.6409/JMSE.200109.0125

摘要

近年來台灣地區交通量日益繁重，在重型車輛無法有效管理下，瀝青鋪面破壞情形嚴重，故需將瀝青性質加以改良，以提昇品質符合未來需求，本研究主要目的是探討高分子改質劑添加量對改質瀝青相轉換之影響，採用中油AC-30瀝青做爲基底材料，苯乙烯－丁二烯－苯乙烯(SBS)做爲改質劑，利用動態剪切式流變儀、相分離和電子顯微鏡等試驗，分別探討兩種材料添加後的物理性質與流變特性變化；從結果可以得知SBS添加於瀝青中可以增加其複合模數值(G*)，但SBS在瀝青中有膨脹現象，添加量越多，膨脹的倍率則漸漸減少；當添加含量在6%以上時，SBS吸收瀝青的油性成分而膨脹，因此有相轉換現象發生，此現象足以影響改質瀝青力學行爲，從電子顯微鏡試驗中可得到此項印證；而3%SBS添加量對混合料之相容性不錯，分離指數均維持在l左右，當SBS含量越高時，相分離現象則越顯著，當混合料中SBS膨脹後的有效體積超越50%時，部分的SBS則因吸收不到瀝青而析出，因此SBS添加上需有限制。

關鍵字

改質瀝青 ； 相轉換 ； 粘彈性質 ； 複合模數

並列摘要

Increased traffic factors such as heavier loads, higher traffic volume and higher tire pressure demand higher performance pavements. A high performance pavement requires asphalt cement that is less susceptible to high temperature rutting or low temperature cracking. The styrene-butadiene-styrene (SBS) triblock copolymer was used to modify asphalt binder. The morphology and engineering properties of the binders were investigated using transmission electron microscopy (TEM) and dynamic shear rheometer. The morphology of polymer-modified asphalt was described by the SBS concentration and the presence of microstructure of the copolymer. When the SBS concentration increased, the copolymer gradually became the dominant phase, and the transition was followed by a change in engineering properties of SBS-modified asphalt. Adding SBS enhanced the engineering properties of asphalt binders. Results from TEM showed that at 3% concentration good compatibility exits between SBS and asphalt binder. The SBS-modified binders might show either a continuous asphalt phase with dispersed SBS particles or a continuous polymer phase with dispersed asphalt globules, or two interlocked continuous phases. The optimum SBS content was determined based on the formation of the critical network between asphalt and polymer.

並列關鍵字

Polymer ； Modified asphalt ； Viscoelastic properties ； Phase separation