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Comparative performance of bio-derived/chemical additives in warm mix asphalt at low temperature

机译：低温温拌沥青中生物/化学添加剂的比较性能

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A corn based bio-derived warm mix asphalt (WMA) additive is in the development stages and has shown to successfully reduce the mixing and compaction temperatures by 30 A degrees C. The WMA additive, isosorbide distillation bottoms (IDB), is a co-product from the conversion of sorbitol to isosorbide where sorbitol is derived by hydrogenating glucose from corn biomass. A detailed investigation of binder properties at variable IDB dosages showed improvement in low temperature binder grades when tested in the BBR at a 0.5 % dosage rate by weight of binder. This research investigates low temperature improvement in two types of binders by comparing IDB-modified binder with binder modified using two commercially available/bio-derived WMA additives from the forest products industry. Multiple stress creep recovery and BBR binder tests indicated that the degree of improvement in binder properties may be binder dependent but improvement was observed for all WMA additives. Low temperature mix performance was evaluated in the semi-circular bending (SCB) test. SCB tests showed additive types were a statistically significant factor in the fracture toughness properties but not for stiffness and fracture energy. IDB was successfully used at reduced mixing and compaction temperatures and does not negatively impact low temperature fracture properties of warm mix asphalt. Improvement of binder properties was observed for all WMA additives studied.
机译：玉米基生物衍生的温拌沥青（WMA）添加剂正处于开发阶段，已显示可将混合和压实温度成功降低30 A摄氏度。WMA添加剂，异山梨醇蒸馏塔底（IDB），是一种山梨糖醇转化为异山梨醇的产物，其中山梨糖醇是通过氢化玉米生物质中的葡萄糖而得到的。在不同IDB剂量下对粘合剂性能进行的详细研究表明，当在BBR中以0.5％的粘合剂重量比进行测试时，低温粘合剂的等级有所改善。这项研究通过将IDB改性的粘结剂与使用两种林产工业的可商业获得的/生物衍生的WMA添加剂改性的粘结剂进行比较，研究了两种粘结剂的低温改进。多次应力蠕变恢复和BBR粘结剂测试表明，粘结剂性能的改善程度可能与粘结剂有关，但观察到所有WMA添加剂都有改善。在半圆弯曲（SCB）测试中评估了低温混合性能。 SCB测试表明，添加剂类型是断裂韧性特性的统计学显着因素，但不是刚性和断裂能的统计因素。 IDB已成功用于降低混合和压实温度，并且不会对温拌沥青的低温断裂性能产生负面影响。对于所有研究的WMA添加剂，均观察到粘合剂性能的改善。

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