The effects of using lime and styrene–butadiene–styrene on moisture sensitivity resistance of hot mix asphalt

Abstract

This study focuses on determining the effects of styrene-butadiene-styrene (SBS) and using mineral filler with lime on various properties of hot mix asphalt especially moisture damage resistance. The asphalt cement was modified with 2%, 4% and 6% SBS. The lime treated mixtures containing 2% lime by weight of the total aggregate as filler. The physical and mechanical properties of polymer modified binder and binder-aggregate mixes were evaluated through their fundamental engineering properties such as dynamic shear rheometer (DSR), rotational viscosimeter (RV) for binders, Marshall stability, stiffness modulus, indirect tensile strength and moisture susceptibility for mixes. The retained Marshall stability (RMS) and tensile strength ratio (TSR) values were calculated to determine the resistance of mixtures to moisture damage. To investigate clearly the effective of SBS and lime seven freeze-thaw cycle was applied to specimens at TSR test. The results indicate that application of SBS modified binders and lime as mineral filler one by one improves the stability, stiffness and strength characteristic of hot mix asphalt. According to retained Marshall stability it is concluded that addition of only 2% lime have approximately same effect with addition of 6% SBS. Using lime together within the SBS modified mixes exhibit high accordance and exacerbates the improvement of properties. Specimens containing both 2% lime and 6% SBS, have the highest stiffness modulus which is 2.3 times higher than those of the control mixture and showed the least reduction in tensile strength ratio while maintaining 0.70 tensile strength ratio after seven freeze-thaw cycle.

Effect of SBS Polymer and Anti-stripping Agents on the Moisture Susceptibility of Hot and Warm Mix Asphalt Mixtures

“…The type of aggregate made some differences in TSR values of mixtures. The results also showed that Aspha-min additives make a cohesive failure in all cases [13].…”

“…The results showed that both of the modifiers improved stiffness, strength and stability of asphalt concrete. Also they reported that addition of only 2% lime have approximately same effect with addition of 6% SBS and mixtures containing both 2% lime and 6% SBS, have higher moisture resistance [13]. In other study by wei et.al (2017) on the effect of Diatomite and SBS on moisture sensitivity resistance of crumb rubber modified SMA, it has been shown that SBS modifier reduces air void and improve sensitivity moisture performance of these mixtures [14].…”

“…Comparing SBS and crumb rubber (CR) modified Asphalt concretes showed that the CR modified mixtures are more recoverable and crack initiation resistance are higher in this mixture, while crack propagation resistance decrease in CR modified mixture [12]. Kok and Yilmaz (2009) studied the effect of lime and SBS modifier on various properties of asphalt concrete especially moisture damage resistance. 2, 4 and 6% SBS added to asphalt concrete.…”

Bitüm Modifikasyonunda Stiren-Butadien-Stiren ile Gilsonit’in Birlikte Kullanılmasının Bitümlü Sıcak Karışımların Kalıcı Deformasyon Dayanımına Etkisi

“…SBS, bitüm ile karıştırıldığında yağsı fraksiyonları bünyesine alarak hacmi artmaktadır. Bitüm modifikasyonunda en sık kullanılan polimer olan elastomer türü stirenbutadien-stiren (SBS) blok kopolimerlerinin, bitümün rijitliğini arttırmasının yanı sıra düşük servis sıcaklıklarında çatlama, yüksek servis sıcaklıklarında ise tekerlek izi oluşumu ve yorulmaya karşı dayanımı arttırdığı belirlenmiştir [10][11][12][13].…”

Laboratory Evaluation of the Stiffness Modulus of a Modified Bituminous Concrete with PR PLAST Sahara

“…It increases the elasticity of bitumen. It has been identified that SBS can obviously improve the mechanical properties of mixtures such as aging [9,10], permanent deformation [11][12][13][14][15][16][17], low temperature cracking [18][19][20] and moisture damage resistance [21][22][23].…”