Investigation on Preparation and Properties of Crack Sealants Based on CNTs/SBS Composite-Modified Asphalt

Abstract

Crack is the main distress of asphalt pavement. Sealant is one of the most commonly used crack repair materials, and its performance is the key to affect the service life of asphalt pavements. In order to find an efficient modifier and optimize the performances of crack sealants. In this paper, carbon nanotubes (CNTs) and styrene-butadiene-styrene (SBS) were used as modifiers to prepare CNTs/SBS composite-modified asphalt crack sealant. The properties of the sealant were tested to evaluate its suitability for crack repair, which included the viscosity, softening point, resilience recovery, cone penetration, flow value, penetration, aging resistance, and fatigue resistance. The results showed that the conventional properties of the sealants meet the requirements of the specification. In addition, after heating aging, the elastic recovery rate of the sealant containing more CNTs decreased only slightly. The sealant containing 1 wt% CNTs exhibited a higher viscosity, fatigue resistance, thermal aging resistance.

An Overview of Micro- and Nano-Dispersion Additives for Asphalt and Bitumen for Road Construction

“…The main motivation for the development of the research in the area of appropriate additives and technological processes that will improve the properties of asphalt and bitumen mixtures and reduce their production temperature is the increasing demand for higher-quality roads and also trends connected with reducing their environmental burden [9,10]. In this article, the terms of "asphalt" and "bitumen" do not have an equal meaning.…”

Characterization of Hot-Applied Joint Sealants and Their Components in Terms of Their Chemical Composition and Basic Performance Properties

“…The use of neat asphalt binders in crack sealants provides a cheap solution for the maintenance of cracking pavements; however, such formulations are prone to debonding and poor low-or high-temperature performance, depending on the grade of the base asphalt binder. Therefore, modified asphalt binders are used [11][12][13].…”

“…Depending on the requirements and purpose, it is possible to regulate the properties of a joint sealant by changing its chemical composition and the proportion of its components-the binders, fillers, additives, and modifiers of the binders [11,[14][15][16]. Styrene-butadiene-styrene (SBS) and rubber crumb CR (10, 15, 20%) have been utilized to modify asphalt-based sealants to overcome the disadvantages of the poor high-temperature and rheological properties of sealants [17].…”