Experimental investigation on concrete overlaid with textile reinforced mortar: Influences of mix, temperature, and chemical exposure

doi:10.1007/s11709-022-0896-z

Front. Struct. Civ. Eng.

2023, Vol. 17

Issue (2) : 271-283 https://doi.org/10.1007/s11709-022-0896-z

RESEARCH ARTICLE

Experimental investigation on concrete overlaid with textile reinforced mortar: Influences of mix, temperature, and chemical exposure

Smitha GOPINATH(

), Ramesh GOPAL, Hemalatha THIYAGARAJAN

CSIR-Structural Engineering Research Centre, Chennai 600113, India

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Abstract

Textile reinforced mortar is widely used as an overlay for the repair, rehabilitation, and retrofitting of concrete structures. Recently, textile reinforced concrete has been identified as a suitable lining material for improving the durability of existing concrete structures. In this study, we developed a textile-reinforced mortar mix using river sand and evaluated the different characteristics of the textile-reinforced mortar under various exposure conditions. Studies were carried out in two phases. In the first phase, the pullout strength, temperature resistance, water absorption, and compressive and bending strength values of three different textile-reinforced mortar mixes with a single type of textile reinforcement were investigated. In the second phase, the chemical resistance of the mix that showed the best performance in the abovementioned tests was examined for use as an overlay for a concrete substrate. Investigations were performed on three different thicknesses of the textile reinforced mortar overlaid on concrete specimens that were subjected to acidic and alkaline environments. The flexural responses and degradations of the textile reinforced mortar overlaid specimens were examined by performing bending tests. The experimental findings indicated the feasibility of using textile reinforced mortar as an overlay for durable concrete construction practices.

Keywords textile reinforced mortar bending tests acid and alkaline environment concrete overlay

Corresponding Author(s): Smitha GOPINATH

Just Accepted Date: 07 December 2022 Online First Date: 14 February 2023 Issue Date: 03 April 2023

Cite this article:

Smitha GOPINATH,Ramesh GOPAL,Hemalatha THIYAGARAJAN. Experimental investigation on concrete overlaid with textile reinforced mortar: Influences of mix, temperature, and chemical exposure[J]. Front. Struct. Civ. Eng., 2023, 17(2): 271-283.

URL:

https://academic.hep.com.cn/fsce/EN/10.1007/s11709-022-0896-z
https://academic.hep.com.cn/fsce/EN/Y2023/V17/I2/271

Fig.1 Particle size grading of quartz sand and river sand.

Tab.1 Mix proportion details

Fig.2 Specimens for water absorption tests: (a) underwater; (b) inside oven.

Fig.3 Test set-up used for pullout strength of yarn.

Fig.4 TRM specimens after subjected to temperature from 200 to 1000 °C.

Fig.5 (a) Sequence when casting TRM panel; (b) set up for bending test.

Fig.6 Test set-up of four-point loading test on TRM-overlaid concrete (unit: mm).

Tab.2 Mechanical properties of various TRM mixes

Tab.3 Salient details of bending tests of TRM panels

Fig.7 Pull-out responses of yarn in TRM.

Fig.8 Failure pattern in pull-out test. (a) TRM with Mix 1; (b) TRM with Mix 2; (c) TRM with Mix 3.

Fig.9 Typical microcrack in (a) Mix 2 and (b) Mix 3.

Fig.10 Ruptured textile after 600 °C.

Fig.11 SEM images of cross sections of textile in TRM: (a) Mix 1 at 200 °C; (b) Mix 1 at 400 °C; (c) Mix 1 at 600 °C; (d) Mix 3 at 600 °C.

Fig.12 SEM images showing the interfacial degradation with an increased temperature: (a) Mix 3 at 200 °C; (b) Mix 3 at 400 °C; (c) Mix 1 at 600 °C; (d) Mix 3 at 600 °C.

Fig.13 SEM images of textiles in transverse direction: (a) Mix 1 at 200 °C; (b) Mix 3 at 200 °C; (c) Mix 1 at 600 °C; (d) Mix 3 at 600 °C.

Fig.14 Failed specimen after testing.

Fig.15 Maximum load of TRM- overlaid concrete in control environment (pH 7).

Fig.16 Load vs. thickness chart of TRM overlay subjected to different pH ranges (28 d).

Fig.17 Load vs. thickness chart of TRM overlay subjected to different pH ranges (56 d).

Fig.18 Load vs. deflection of TRM-overlaid concrete after exposure to various pH levels for 28 d. (a) pH 4; (b) pH 6; (c) pH 8; (d) pH 10.

Fig.19 Load vs. deflection of TRM-overlaid concrete after exposure to various pH levels for 56 d. (a) pH 4; (b) pH 6; (c) pH 8; (d) pH 10.

Fig.20 Failure pattern of TRM-overlaid concrete beam. (a) Bottom view of crack; (b) front view of crack.

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