Assessment of deterioration in RHA-concrete due to magnesium sulphate attack

Habeeb, G. A.; Mahmud, Hilmi Bin; Hamid, Nor Baizura

doi:10.1007/s12613-010-0375-8

Cited by 7 publications

(4 citation statements)

References 6 publications

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“…At 60 days, BAC with 10% and 15% RHA showed a comparable strength than control BAC, while 20% and 25% RHA showed strength losses of about 15 ) to penetrate BAC and leads to the filling of the porosity of BAC. A similar reflection was also made by Habeeb et al [75]. On the contrary, the loss in the strength of RBAC may be because of the accumulation of magnesium silicate hydrate (M-S-H) gel causing the magnesium to decompose the calcium compounds of C-S-H gel into M-S-H gel, which has no cementitious properties and results in the lowering of compressive strength.…”

Section: Sulfate Attack On Rbacsupporting

confidence: 64%

Strength and Durability Parameters of Brick Aggregate Concrete Incorporating Rice Husk Ash as a Partial Replacement of Cement

Noaman

Karim

Islam

et al. 2022

Advances in Materials Science and Engineering

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This study assessed the strength and durability parameters of brick aggregate concrete (BAC) incorporating rice husk ash (RHA) as a partial replacement of cement. For this, concrete cylinders (100 mm × 200 mm) were made with 0% (control) to 25% RHA as a partial replacement of ordinary Portland cement (OPC) at a mix proportion of 1 : 1.5 : 3 and a water-to-binder (w/b) ratio of 0.50. Specimens were immersed separately in normal water, 3% sodium chloride (NaCl), 5% sodium sulfate (Na2SO4), 5% magnesium sulfate (MgSO4), 1% hydrochloric acid (HCl), and 1% sulfuric acid (H2SO4) solutions for several immersion periods. The slump test results indicated that the workability of BAC containing RHA (RBAC) decreased about 29.69%–75.02% compared to control (0% RHA). After 90 days, the BAC containing RHA (up to 15% replacement) was found approximately 2.28%–6.64% greater compressive strength than that of control concrete. In addition, water absorption and porosity of RBAC were around 17.59%–40.73% and 12.12%–35.68% lower than that of control concrete, respectively. Similarly, RBAC (up to 25% replacement) exhibited roughly 35.62%–54.79% higher resistance against chloride attack and 0.39%–4.56% better resistance against Na2SO4 attack (up to 15% replacement), however, it exhibited inferior resistance against MgSO4 attack compared to control. Meanwhile, BAC with 10% RHA showed about 5.35% and 1.00% superior performance than that of control concrete against HCl and H2SO4 attack, respectively. The relationships between the strength and durability parameters of RBAC also suggested that RHA contributes to improving the strength and durability parameters of BAC.

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Section: Sulfate Attack On Rbacsupporting

confidence: 64%

Strength and Durability Parameters of Brick Aggregate Concrete Incorporating Rice Husk Ash as a Partial Replacement of Cement

Noaman

Karim

Islam

et al. 2022

Advances in Materials Science and Engineering

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“…Chatveera and Lertwattanaruk reported that a replacement level of 30% of RHA-admixed cement mortar showed less expansion when exposed to a high-sulphate environment; however, the expansion of cement mortar increased when increasing the replacement level of RHA, and also reduced the traditional concrete strength [ 110 ]. RHA-blended concrete improved the strength, porosity, and corrosion resistance of concrete as well as resistance to sulphate attack [ 92 , 102 ]. All these results prove beyond doubt that RHA is an effective SCM; at an optimal replacement level up to 30% of Portland cement, RHA improves strength and reduces sulphate reactions, chloride diffusion, and the corrosion rate of embedded steel rebar.…”

Section: Supplementary Cementitious Materials (Scms)mentioning

confidence: 99%

Review of the Effects of Supplementary Cementitious Materials and Chemical Additives on the Physical, Mechanical and Durability Properties of Hydraulic Concrete

et al. 2021

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Supplementary cementitious materials (SCMs) and chemical additives (CA) are incorporated to modify the properties of concrete. In this paper, SCMs such as fly ash (FA), ground granulated blast furnace slag (GGBS), silica fume (SF), rice husk ash (RHA), sugarcane bagasse ash (SBA), and tire-derived fuel ash (TDFA) admixed concretes are reviewed. FA (25–30%), GGBS (50–55%), RHA (15–20%), and SBA (15%) are safely used to replace Portland cement. FA requires activation, while GGBS has undergone in situ activation, with other alkalis present in it. The reactive silica in RHA and SBA readily reacts with free Ca(OH)2 in cement matrix, which produces the secondary C-S-H gel and gives strength to the concrete. SF addition involves both physical contribution and chemical action in concrete. TDFA contains 25–30% SiO2 and 30–35% CaO, and is considered a suitable secondary pozzolanic material. In this review, special emphasis is given to the various chemical additives and their role in protecting rebar from corrosion. Specialized concrete for novel applications, namely self-curing, self-healing, superhydrophobic, electromagnetic (EM) wave shielding and self-temperature adjusting concretes, are also discussed.

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“…The figures show the improvement of the strength immersed in MS relative to the strength of curing with water on all concrete mixed with the SCM products, such as FA, RHA, and GGBS. This can be attributed to the formation of the expansive ettringite in the presence of tricalcium aluminate inside the cement paste matrix and the infiltrated SO 4 + ion, which resulted in filling the voids, thus increasing the concrete maturity [14].…”

Section: Comparing the Effect Of Ms With Curing Condition On Sccmentioning

confidence: 99%

Effect of Magnesium Sulphate on Self-Compacting Concrete Containing Supplementary Cementitious Materials

Hassan

Mahmud

Jumaat

et al. 2013

Advances in Materials Science and Engineering

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The length change is negligible and can be attributed to the normal distension of concrete. On the other hand, concrete suffering from mass loss gives a good indicator about the durability of SCC. Permeability of concrete is an important factor in classifying its durability generally; concrete with low Permeability will afford better protection of the reinforcement within it than concrete with high Permeability. In this paper, the assessment of magnesium sulphate (MS) attack on concrete containing various ratios of the supplementary cementitious materials (SCM) was investigated for concrete containing FA, RHA, and GGBS with cement replacement levels of 15%, 10%, and 5%, respectively, based on the selected samples from the concrete to the statement of the effect of magnesium on some of the characteristics of concrete such as compressive strength, height, and weight compared with similar samples but under laboratory conditions dry and moist water treatment. Test results showed that the SCC content SCM appear to have higher strength values than those stored in water and air sample; the highest value of mass loss is recorded for the control mixture compared with concrete content SCM, and the change in length in curing concrete is much less relative to the change for concrete immersed in MS.

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Assessment of deterioration in RHA-concrete due to magnesium sulphate attack

Cited by 7 publications

References 6 publications

Strength and Durability Parameters of Brick Aggregate Concrete Incorporating Rice Husk Ash as a Partial Replacement of Cement

Strength and Durability Parameters of Brick Aggregate Concrete Incorporating Rice Husk Ash as a Partial Replacement of Cement

Review of the Effects of Supplementary Cementitious Materials and Chemical Additives on the Physical, Mechanical and Durability Properties of Hydraulic Concrete

Effect of Magnesium Sulphate on Self-Compacting Concrete Containing Supplementary Cementitious Materials

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