Mechanical properties of warm mix asphalt prepared using foamed asphalt binders.

摘要: Warm mix asphalt (WMA) is a name given to group of technologies that have the common purpose reducing viscosity binders. This reduction in offers advantage producing asphalt-aggregate mixtures at lower mixing and compaction temperatures, subsequently energy consumption pollutant emissions during production placement. WMA reduce binders’ through addition organic or chemical additives by introducing cool water into heated molten under controlled temperature pressure conditions, resulting so-called foamed binder. The latter has received increased attention Ohio since it does not require use costly additives. In spite above-mentioned advantages mixtures, many concerns been raised regarding susceptibility this material moisture-induced damage permanent deformation due reduced temperatures used production. Therefore, study was conducted develop laboratory procedure produce prepared using binders (WMA-FA), evaluate their performance comparison conventional hot (HMA). Two aggregates (natural gravel crushed limestone) two (PG 64-22 PG 70-22M) were study. A scale binder foaming device called WLB10 foam aggregate gradation met Department Transportation (ODOT) Construction Material Specifications (C&MS) requirements for Item 441 Type 1 Surface Course subjected medium traffic. resistance WMA-FA HMA measured AASHTO T 283, Asphalt Pavement Analyzer (APA) Simple Performance Test (SPT). Based on experimental test results subsequent analyses findings, following conclusions made: (1) are more workable easily compacted than even though they produced temperatures. (2) slightly susceptible moisture mixtures. However, difference statistically insignificant. if designed properly, both expected meet ODOT’s minimum tensile strength ratio (TSR) requirement proposed traffic level. (3) especially those natural unmodified binders, prone rutting corresponding effect types found be significant type. result suggests appropriate can help overcoming any adverse effects mixture performance.