The Evaluation of Damage Effects on MgO Added Concrete with Slag Cement Exposed to Calcium Chloride Deicing Salt

Jang, Jae K.; Kim, Hong Gi; Kim, Jun Hyeong; Ryou, Jae-Suk

doi:10.3390/ma11050793

Cited by 16 publications

(9 citation statements)

References 42 publications

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“…e procedure to sections preparation is according to the literature [35]. After exposed to 140 days of drying-wetting cycles in 5% Na 2 SO 4 solution, the cubic specimen was cut into 5 sections, each of which is 28 mm (2 mm reduction due to cutting wear).…”

Section: Section Preparationmentioning

confidence: 99%

“…is is mainly because the polypropylene fibers restrain the pores diameter to enlarge [25], further making the whole structure of the concrete more complete [9,20,[22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40].…”

Section: E Pores Distributionmentioning

confidence: 99%

“…is is mainly due to the chemical reactions between hydrates and Na 2 SO 4 . e reactions are shown in the following equations [21,35,42]:…”

Section: Crack Width Analysismentioning

confidence: 99%

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The Concrete Performance with Iron Tailings Sand Modified by Polypropylene Fibers under Aggressive Environment

Tang

Mao

et al. 2020

Advances in Materials Science and Engineering

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This paper aimed to explore the performance of concrete with iron tailings sand modified by polypropylene fibers under aggressive environment. Three kinds of concrete (ordinary concrete, concrete with iron tailings sand (ITS), and concrete with ITS modified by polypropylene fibers) were exposed to drying-wetting cycles in 5% Na2SO4 solution for 28, 56, 84, 112, and 140 days. The performance, such as pores distribution, crack width, corrosion products, mass variation, expansion variation, compressive strength, flexural strength, and the diffusion of sulfate ion were measured at regular time intervals during the whole exposure period to describe the associated evolution laws. The results show that, in the process of the corrosion of sodium sulfate solution, the formation of gypsum and ettringite (AFT) has an important impact on the harmful pores (>0.1 μm), cracks, mass variation, expansion variation, compressive strength, and flexural strength of the three concrete. Polypropylene fibers can refine the pores development and inhabit the crack development of the concrete with ITS, further alleviating the rate of sulfate ion attack on concrete and the rate of increase of corrosion products, so that the mass variation, the expansion variation, and the reduction of compressive strength and flexural strength can be limited effectively. Furthermore, in the concrete with ITS modified by 0.1% polypropylene fibers, the content of sulfate ions diffused is always the lowest.

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Section: Section Preparationmentioning

confidence: 99%

Section: E Pores Distributionmentioning

confidence: 99%

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The Concrete Performance with Iron Tailings Sand Modified by Polypropylene Fibers under Aggressive Environment

Tang

Mao

et al. 2020

Advances in Materials Science and Engineering

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“…It was verified that the use of GGBFS can improve the microstructures of concrete by adding a C-S-H phase, and it is effective in reducing the conductivity of chloride due to its provision of an increased alumina content [19]. Jang et al [20] conducted a 180-day immersion test with a 30% CaCl 2 solution and reported that the system with GGBFS and MgO endured damage far more effectively. Cheng et al [21] claimed that the partial substitution of cement with GGBFS had a significant effect on the total flexural stiffness, corrosion rate, and permeability of a fabricated concrete beam.…”

Section: Introductionmentioning

confidence: 98%

Assessment of Optimum CaO Content Range for High Volume FA Based Concrete Considering Durability Properties

Lee

Choi

et al. 2020

Applied Sciences

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There have been many studies on the effect of durability and compressive strength on the increase of the mixing rate of admixtures. However, there is no research that can provide a guide on the optimal mixture proportions for maintaining compressive strength and secure durability properties when using local materials. Therefore, the purpose of this article is to assess the durability and engineering performances of concrete based on local fly ash (FA), as well as to derive the optimum CaO content scope for ensuring durability. The results of this study were compared with the results of the previous study of high-volume ground-granulated blast-furnace slag (GGBFS) concrete. To achieve this, tests were carried out by increasing the admixture mixing rate in 10% increments from 0% to 70%. The unit water was set at 175 kg/m3 and the amount of binder was set at 330 kg/m3. It was found that the overall compressive strength of the hardened concrete decreased when the admixture mixing rate increased. In addition, the compressive strength of specimens tended to improve as all the CaO contents of the admixture types increased. When the durability properties were examined, it was found that the relative dynamic elasticity modulus and carbonation depth decreased, and the chloride penetration depth increased as the CaO content increased for both GGBFS and FA. The weight loss rate, however, remained similar. Based on the results of this study, the optimal CaO content that achieved satisfactory engineering and durability properties was found to be between 39% and 48% for FA. The results of this study will be able to offer guidelines for the mixture rates of FA when mixing durable concrete for use in the field. Additionally, these results are expected to be utilized as a basis for determining instructions relating to chemical composition in order to develop binders with improved durability.

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“…The MgO–SiO 2 –H 2 O system was developed as a novel cementitious material [1,2,3,4,5]. Numerous applications have been realized, including usage in thermal insulation material [6], waste sealing material [7], refractory material [8], and soil stabilization [9].…”

Section: Introductionmentioning

confidence: 99%

Effect of the MgO/Silica Fume Ratio on the Reaction Process of the MgO–SiO2–H2O System

Yang

Líu

et al. 2018

Materials

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In order to clarify the effect of the MgO–silica fume (SF) ratio on the reaction process of the MgO–SiO2–H2O system, the reaction products and degree of reaction were characterized. Furthermore, the parameters of the reaction thermodynamics were calculated and the reaction kinetics were deduced. The results indicate that a large amount of Mg(OH)2 and small quantities of magnesium silicate hydrate (M–S–H) gels were generated upon dissolution of MgO. However, the M–S–H gels were continuously generated until the SF or Mg(OH)2 was consumed completely. For a MgO dosage less than 50% of the total MgO–SiO2–H2O system, the main product was M–S–H gel, while for a MgO dosage greater than 50%, the main product was Mg(OH)2. The results indicate that M–S–H gels have greater stability than Mg(OH)2, and the final reaction product was prone to be M–S–H gels. Based on the experimental values, an equation is proposed for the reaction kinetics of MgO.

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The Evaluation of Damage Effects on MgO Added Concrete with Slag Cement Exposed to Calcium Chloride Deicing Salt

Cited by 16 publications

References 42 publications

The Concrete Performance with Iron Tailings Sand Modified by Polypropylene Fibers under Aggressive Environment

The Concrete Performance with Iron Tailings Sand Modified by Polypropylene Fibers under Aggressive Environment

Assessment of Optimum CaO Content Range for High Volume FA Based Concrete Considering Durability Properties

Effect of the MgO/Silica Fume Ratio on the Reaction Process of the MgO–SiO2–H2O System

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