Abstract
Cement emulsified asphalt (CEA) mortars achieve insufficient bond strength with substrate cement concrete slab. To ameliorate problems emerging from this, the emulsified asphalt (EA) in CEA mortars was partly replaced by epoxy emulsion (EE) at contents of 0%, 10%, 20%, and 30%, yielding CEA mortars with enhanced properties. The bond strength, mechanical strength, toughness, and durability (including drying shrinkage and erosion resistance) of modified CEA mortars were assessed. The results showed that partial replacement of EA with EE improved the bond strength, mechanical strength, drying shrinkage, and erosion resistance of CEA mortars. A good correlation was found between the proportions of the EE replacement and the bond strength of CEA mortars. Partial replacement of EA with a small amount of EE exerted no significant effect on the toughness of CEA mortar. The stronger network structure of CEA mortars containing EE improved the compactness, thus improving the performance of CEA mortars. Based on these findings, EE is suggested as partial replacement of EA for enhancing the properties of CEA mortars.
Highlights
Today, polymer-modified cement mortars are widely used in concrete structures as finishing or repair materials to prolong the service life of infrastructures [1, 2]
(3) e main properties of nonionic waterborne EE and curing agent purchased from the Junhua building materials factory (Shanxi, Taiyuan, China) are shown in Tables 3 and 4, respectively. e appearances of EE and the curing agent are shown in Figures 1(b) and 1(c), respectively. e test methods of waterborne EE and the curing agent followed Chinese Standard GB/ T 36797-2018. e type of epoxy resin with an epoxy value of 0.51 mol/100 g in the epoxy emulsion was E 51. e curing agent was an amine curing agent with an amine value of 320 mol/100 g. e ratio of EE to the curing agent was 1 : 1 when used for Cement emulsified asphalt (CEA) mortars, which was chosen according to the experience informed by a laboratory test
emulsified asphalt (EA) in CEA mortar was partly replaced by EE with additions varying from 0% to 30%. e properties of resulting CEA mortars (I, II, III, and IV) were investigated. e following conclusions could be drawn: (1) EE as partial replacement of EA improves the mechanical strength and bond strength of CEA mortars. e mechanical strength and bond strength of CEA mortar-IV increased maximally among all four types of CEA mortars at ages of 3, 7, and 28 d
Summary
Polymer-modified cement mortars are widely used in concrete structures as finishing or repair materials to prolong the service life of infrastructures [1, 2]. CEA mortars are used as repair materials for cement pavements or other cement infrastructures [4, 5]. CEA mortars need to have good coordination deformation ability and interface bond strength with the concrete slab when used as a bedding layer between the track slab and the concrete foundation or as repair materials. Researches by Liu et al [6] and Peng et al [7] indicated that CEA mortars do not yield sufficient interfacial bond strength with cement concrete. Liu et al [8] pointed out that incorporation of stabilizers in CEA mortars increased the interfacial bonding strength. Zhang et al [9] showed that
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