Rubber‐like thermosetting epoxy asphalt composites exhibiting atypical yielding behaviors

Abstract

Rubber-like thermosetting epoxy asphalt composites (REACs) were prepared by curing epoxy resin (diglycidyl ether of bisphenol A) with curing agents system made up of maleated petroleum asphalt, adipic acid, and methylhexahydrophthalic anhydride. REACs' glass transition temperatures (T g ) and mechanics performances were investigated by differential scanning calorimetry (DSC) and universal tester, respectively. DSC results indicated that REACs had homogeneous phase structures, and their T g were lower than room temperature. Large elongation at break (e b ), as high as 150-286%, and atypical yielding behaviors similar to so-called ''hard elastic'' thermoplastics were observed simultaneously for the first time as to thermosetting epoxy composites at room temperature. The striking characteristics of REACs were ascribed to the formation of unique asphalt-filled bimodal networks, consisting of simultaneous cured maleated asphalt short-chain and dicarboxylic acid long-chain interpenetrating bimodal networks and wherewith filled unmaleated asphalt. The experimental results suggest that these inexpensive REACs may find promising applications in many engineering fields.

Thermal, mechanical properties, and low‐temperature performance of fibrous nanoclay‐reinforced epoxy asphalt composites and their concretes

“…In China, EA concrete has been used in more than 40 long‐span bridges since 2000. Furthermore, EA concrete has also been used in tunnels, pavement at intersections of heavy duty roads, and porous asphalt pavements with high durability …”

Rubber-like Quasi-thermosetting Polyetheramine-cured Epoxy Asphalt Composites Capable of Being Opened to Traffic Immediately

“…2 (a is at 20 °C, and b is at 0 °C). All samples had elastic properties similar to those of anhydride cured thermosetting EACs at 20 °C; as the asphalt content increases, the tensile strength decreases and the rupture elongation is enhanced 16 . Previous studies have demonstrated that the addition of asphalt has no influence on the extent of the epoxy curing reaction under the same curing conditions 25 .…”

“…Conventionally, the characterization method of EACs has been borrowed from the characterization of plastics, for example, ASTM D 638–2010: Standard Test Method for the Tensile Properties of Plastics 12 13 16 17 18 19 20 21 25 . To compare the performance of polyetheramine-cured EACs, direct tensile tests were performed with a universal tester at 20 °C and 0 °C, as shown in Fig.…”

“…According to their curing agents, EACs are categorized as amine systems or acid systems 9 12 13 14 15 . The typical laboratory curing conditions of an acid EAC system are 4 h at 120 °C; however, at the paving site where the EAC is exposed to the atmosphere, temperatures cannot be maintained at 120 °C for more than 1 h during the paving process; consequently, to achieve a performance that is equivalent to that in the laboratory, according to the empirical Arrhenius equation of chemical reaction rate theory, sites paved via the acid EAC systems should be naturally maintained in high summer for about 45 days 16 17 18 19 20 21 . A typical construction process is shown in Fig.…”

Study on microstructure, rheology and thermal stability of cement epoxy asphalt mortar multiphase materials

“…In fact, the epoxy resin-modified asphalt emulsion contains chemical reaction functional groups, such as carboxyl, hydroxyl, epoxy and other organic functional groups, which can coordinate or crosslink with Ca 2þ , Al 3þ of cement hydration products (Ohama, 1998). In addition, chemical modified asphalt emulsion (with an organic amine group) can also react with epoxy resin at room temperature to form a 3D interpenetrating gel network structure (Kang et al, 2010a(Kang et al, , 2010b. Owing to the 'fibre reinforced' effect of this structure, the epoxy asphalt cement mortar has a relatively high compressive strength.…”