Investigation on effect of aggregate on three non-destructive testing properties of concrete subjected to sulfuric acid attack

Xiao, Jie; Qu, Wenjun; Li, Wengui; Zhu, Pinghua

doi:10.1016/j.conbuildmat.2016.04.017

Cited by 38 publications

(5 citation statements)

References 33 publications

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“…A few studies have been conducted to measure the degradation depths of OPC-based binder or AAMs after immersion in various acidic solutions and related degradation mechanisms were also proposed [3,46,53,[56][57][58][59]. The experiment work of Lloyd et al [46] revealed that the degradation depth is a more reliable method to assess the degradation kinetics, particularly for AAMs compared to mass loss.…”

Section: Introductionmentioning

confidence: 99%

Degradation of Alkali-Activated Slag and Fly Ash Mortars under Different Aggressive Acid Conditions

Ren

Zhang

Nicolas

2021

J. Mater. Civ. Eng.

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Acidic environments constitute serious chemical threats to concrete-like cementitious materials. The purpose of this study is to experimentally investigate the degradation of alkali-activated slag/fly ash mortars with different slag/fly ash ratios: 80/20, 60/40 and 40/60 in acidic environments. Mortar samples were exposed to three different types of aggressive acidic solutions: phosphoric acid, sulphuric acid and a mixture of phosphoric acid and sulphuric acid maintained at a constant pH value of 2.5 ± 0.5 for a period of 150 days. Results showed that in the case of alkali-activated mortars, the aggressivity of the phosphoric acid alone is greater compared to the other acidic solutions. An optimum ratio of slag/fly ash was identified as a higher resistance against the three types of acidic environments studied here.Further, the degradation process of alkali-activated mortars seems to be different than the one observed on OPC, there are two clear stages. By using a combination of the Hill function and the Fick's second law a first model of degradation is proposed in this study. Finally, the results of theoretical analysis predicted that the degradation depth of alkali-activated slag/fly ash mortars exposed to sulphuric acid environment for 50 years could be reduced by about 52% -60% compared to that of an OPC-based mortars.

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Section: Introductionmentioning

confidence: 99%

Degradation of Alkali-Activated Slag and Fly Ash Mortars under Different Aggressive Acid Conditions

Ren

Zhang

Nicolas

2021

J. Mater. Civ. Eng.

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“…Moreover, concrete structures in industrial zones are susceptible to deterioration due to acid rain, of which sulfuric acid is a chief component. Portland cement concrete hydration items are alkaline and have a pH rating of 12 to 13.5 [ 39 ]. For sulphate attacks on concrete (sodium sulphate), there are two types, namely external and internal.…”

Section: Introductionmentioning

confidence: 99%

Acid and Sulphate Attacks on a Rubberized Engineered Cementitious Composite Containing Graphene Oxide

et al. 2020

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The objective of this research was to determine the durability of an engineered cementitious composite (ECC) incorporating crumb rubber (CR) and graphene oxide (GO) with respect to resistance to acid and sulphate attacks. To obtain the mix designs used for this study, response surface methodology (RSM) was utilized, which yielded the composition of 13 mixes containing two variables (crumb rubber and graphene oxide). The crumb rubber had a percentage range of 0–10%, whereas the graphene oxide was tested in the range of 0.01–0.05% by volume. Three types of laboratory tests were used in this study, namely a compressive test, an acid attack test to study its durability against an acidic environment, and a sulphate attack test to examine the length change while exposed to a sulphate solution. Response surface methodology helped develop predictive responsive models and multiple objectives that aided in the optimization of results obtained from the experiments. Furthermore, a rubberized engineered cementitious composite incorporating graphene oxide yielded better chemical attack results compared to those of a normal rubberized engineered cementitious composite. In conclusion, nano-graphene in the form of graphene oxide has the ability to enhance the properties and overcome the limitations of crumb rubber incorporated into an engineered cementitious composite. The optimal mix was attained with 10% crumb rubber and 0.01 graphene oxide that achieved 43.6 MPa compressive strength, 29.4% weight loss, and 2.19% expansion. The addition of GO enhances the performance of rubberized ECC, contributing to less weight loss due to the deterioration of acidic media on the ECC. It also contributes to better resistance to changes in the length of the rubberized ECC samples.

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“…Reinforced concrete structures have been the most widely used structures in civil engineering since the late 19th century due to good mechanical properties, low cost, and good durability in normal environments [1][2][3][4]. However, under corrosive environmental conditions (such as marine environment, deicing salt environment, carbonation environment, acid corrosion environment, etc.…”

Section: Introductionmentioning

confidence: 99%

Research on the Bonding Performance of BFRP Bars with Reactive Powder Concrete

Xiao,

Murong,

Chen

et al. 2023

Buildings

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In recent years, replacing steel bars with basalt fiber-reinforced polymer (BFRP) bars and replacing ordinary concrete with reactive powder concrete (RPC) are considered effective solutions to the corrosion problem of steel bars in ordinary reinforced concrete structures. In order to study the bonding performance between BFRP bars and RPC, a total of 27 bonding specimens were tested by pull-out test. The effects of steel fiber volume content (0%, 1.5%, 2%), protective layer thickness (25 mm, 40 mm, 55 mm, 69 mm), and bond anchorage length of bars (3 d, 4 d, 5 d; d is the diameter of the bars) on the bond performance were studied. The experimental results indicated that the BFRP bar and reactive powder (RPC) concrete interface exhibited better bonding performance, and the steel fibers mixed in RPC can play the role of crack-blocking enhancement in the specimen, which improves the shear and tensile properties of the concrete, thus improving the bond strength between BFRP bar and RPC. Three failure modes were observed in the pull-out tests: BFRP bar shear failure, splitting failure, and concrete shear failure. The bond strengths of BFRP bars and RPC with 0%, 1.5%, and 2% steel fiber content were 24.2 MPa, 32.1 MPa, and 34.5 MPa, respectively. With the increase in bond anchorage length, the ultimate bond strength tended to increase first and then decrease. There may be an optimal bonding length between BFRP bar and reactive powder concrete, and when the optimal bonding length is exceeded, the bond strength decreases with the increase in bonding length. With the increase in the protective layer thickness, the improvement in the bond strength of the BFRP bar and RPC was not very significant.

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Investigation on effect of aggregate on three non-destructive testing properties of concrete subjected to sulfuric acid attack

Cited by 38 publications

References 33 publications

Degradation of Alkali-Activated Slag and Fly Ash Mortars under Different Aggressive Acid Conditions

Degradation of Alkali-Activated Slag and Fly Ash Mortars under Different Aggressive Acid Conditions

Acid and Sulphate Attacks on a Rubberized Engineered Cementitious Composite Containing Graphene Oxide

Research on the Bonding Performance of BFRP Bars with Reactive Powder Concrete

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