Effects of Diatomite and SBS on Freeze-Thaw Resistance of Crumb Rubber Modified Asphalt Mixture

Abstract

Asphalt mixture is susceptible to moisture damage under the effect of freeze-thaw (F-T) cycles. In this paper, crumb rubber (CR) was used to modify stone mastic asphalt (SMA) and the effects of diatomite and styrene butadiene styrene (SBS) on antifreezing performances of crumb rubber modified SMA (CRSMA) were investigated. Regression analysis and modified grey model (MGM) were used to construct the prediction models for properties of modified mixtures. CRSMA, CR and diatomite modified SMA (CRDSMA), and CR and SBS modified SMA (CRSSMA) were prepared in laboratory, respectively. Process of F-T cycles was designed. Air void, indirect tensile strength (ITS), and indirect tensile stiffness modulus (ITSM) were measured to evaluate the antifreezing performances of CRSMA, CRDSMA, and CRSSMA. Results indicate that air voids increase with the increasing of F-T cycles. ITS and ITSM all decrease with the increasing of F-T cycles. The addition of diatomite and SBS can reduce the air void and improve the ITS and ITSM of CRSMA. CRSSMA presents the lowest air void, highest tensile strength, and largest stiffness modulus, which reveals that CRSSMA has the best F-T resistance among three different kinds of mixtures. Moreover, MGM (1, 2) models present more favorable accuracy in prediction of air void and ITS compared with regression ones.

High- and Low-Temperature Properties and Thermal Stability of Silica Fume/SBS Composite-Modified Asphalt Mortar

“…Wei et al studied the diatomite and SBS composite-modified asphalt by using regression analysis and a modified grey model. ey found that diatomite could reduce the air void and improve the indirect tensile strength and indirect tensile stiffness modulus of crumb rubber-modified stone mastic asphalt (SMA) [12]. Luo et al analyzed a modified mechanism of diatomite-modified asphalt by using the infrared (IR) spectrum and scanning electron microscope (SEM).…”

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

“…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].…”

Evaluation of the Durability and the Property of an Asphalt Concrete with Nano Hydrophobic Silane Silica in Spring-Thawing Season

“…x 0.5 a + A max (15) For the convenience of the following expression, the above formula is written as…”

“…Because of the complexity of the freeze-thaw cycle damage phenomenon, using proper additives and modifiers is considered the most cost-effective technique for mitigating freeze-thaw cycle damage. Wei et al investigated the effect of diatomite and styrene butadiene styrene on antifreezing performance of crumb rubber modified stone mastic asphalt (SMA), the results indicate that crumb rubber and diatomite modified SMA has the good freeze-thaw resistance [15]. Klinsky et al held that the use of polypropylene and aramid fibers in HMA could enhance the performance of asphalt pavements against common distresses [16].…”