Effects of Water Exposure on the Interfacial Bond between an Epoxy Resin Coating and a Concrete Substrate

Abstract

Interfacial bond properties of six different epoxy resins used to coat submerged concrete structures were investigated. Test variables included coating type, coating equipment, and underwater curing time. Coating thickness and pull-off bond strength were measured using commercially available test equipment. Coating thickness and bond strength varied greatly depending on the manufacturer. The standard (control) coating equipment positively influenced the bond strength compared to other equipment. The effect of curing time on the bond properties was not significant within the range of 24 to 72 h. Lastly, some important considerations for the underwater coating of actual marine and coastal concrete structures were discussed, and suggestions for future research are presented.

Influence of Polymer Types on the Mechanical Properties of Polymer-Modified Cement Mortars

“…The amount of water was determined based on previous studies [14]. The substrate concrete specimens were prepared with a cement content of 340 kg/m 3 and a water-cement ratio of 0.24 to produce a high strength based on the result of previous research [20]. The averaged compressive strength of the substrate concrete measured at 28 days was 82.3 MPa.…”

“…The pull-off bond strengths of the PCMs were determined from five samples as per ASTM C 1583 [27]. The pull-off rate adopted in this study was 0.02 MPa/s based on previous research [20]. Table 5 and Figure 2 show the compressive strength results for the PCMs, and the result of the control specimen is included in the same figure for better comparison.…”

“…It is known that adding a polymeric compound to a cementitious material can improve the material properties such as strength, durability, and interfacial bond between the newly applied material and the existing substrate [1][2][3][4][5][6][7][8][9][10][11][12]. Therefore, incorporating polymers in patch repair cement mortars is common for better repair work of various reinforced concrete (RC) structures, including bridges, dams, high-rise buildings, pavements, and marine concrete structures [13][14][15][16][17][18][19][20][21]. There exist a few representative types of polymers, including acrylate polymers (AC), polyvinyl alcohol (PVA), styrene-butadiene rubber (SBR), and ethylene-vinyl acetate (EVA), all of which are utilized in the repair or surface treatment of RC structures.…”

Constructing Machine Tool Foundations Using an LMP Alloy

“…The basic structure of a machine tool foundation is shown in Figure 1. The material usually used to construct machine tool foundations is concrete [2], though over the years, various adaptations to this have been proposed, such as ferrocement [3,4], resin concrete [5,6], epoxy resin concrete [7,8], and hybrid polymer concrete [9]. When concrete or concrete-based materials are used as the grouting to construct foundations for heavy or precision machine tools, the process typically involves the handling of a large volume of construction material that is poured in several stages to provide the basic foundation, followed by primary and secondary grouting.…”

The Effect of the Addition of Polypropylene Fibers to Primer on the Pull-Off Strength of Epoxy Resin Coatings

“…Wang et al [ 9 ] and Szymanowski [ 10 ] highlighted the strong relation between the protective properties of coatings and overlays and the loss of adhesion as a function of aging processes and durability. Won et al [ 11 ] stated that long-term exposure to water affects the adhesion between the epoxy resin coating and the concrete substrate. Kim et al [ 12 ] studied the early-age tensile bond characteristics of epoxy coatings for underwater applications.…”