Effects of sulfate on cement mortar with hybrid pozzolan substitution

Demir, İlhami; Güzelkücük, Selahattin; Sevim, Özer

doi:10.1016/j.jestch.2018.04.009

Cited by 37 publications

(17 citation statements)

References 29 publications

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“…Moreover, the findings in the current study concur with the findings reported by Demir et al [21] where OPC mortar with blast-furnace slag, bottom ash, and fly ash as SMCs was investigated where mortar samples were immersed in the Na 2 SO 4 solution for 360 days and strength performance of blended mortar was 2% greater than that of OPC mortar. It was previously declared that samples immersed in lower proportions of Na 2 SO 4 (0.27-1.8%) for 300 days had no significant damage caused on mortar properties.…”

Section: Compressive Strength Of the Specimens Under Water Sulphate And Chloride Solutionssupporting

confidence: 92%

“…Demir et al [21] replaced cement with the combination of fly ash, bottom ashes, and blast-furnace slag and evaluated the performance of Ordinary Portland Cement (OPC) mortars under 5% Na 2 SO 4 solution for 360 days. It was found the blended cement mortar has a compressive strength of 2% greater than that of OPC when cement is replaced with 5% fly ash, 5% blast-furnace slag, and 5% bottom ash.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Strength and Durability Properties of Concrete Containing Pumice and Scoria as Supplementary Cementitious Material

Chambua

Jande

Machunda

2021

Advances in Materials Science and Engineering

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Concrete structures suffer serious deterioration under a corrosive environment. Consequently, the service life of these concrete structures is decreased and deteriorates under combined attack of sulphate and chlorides. Most studies confined on single deteriorating factor such as sulphate attack only or chloride attack only but the current study focused on the influence of natural pumice (NP) and natural scoria (NS) on the strength performance of concrete exposed to the combined attack of sulphate and chloride. Portland cement (PLC) was replaced with NP or NS at a substitution level of 10%. Concrete samples were cured in water for the curing period of 28 days. Afterwards, the specimens were immersed in 5% sodium sulphate (Na2SO4), 5% sodium chloride (NaCl), and combined sodium sulphate and chloride solutions for additional curing of 28, 56, and 90 days. The results were compared between concrete mixes with NP or NS and control mix (CT) with PLC. The effects of sulphate, chloride, and combined sulphate and chloride were evaluated in terms of change in weight, variation in compressive strength, and degree of damage. Conclusively, the application of NP and NS has extraordinary potential to be utilized as a cementitious material in concrete to increase the resistance against aggressive salts.

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Section: Compressive Strength Of the Specimens Under Water Sulphate And Chloride Solutionssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Strength and Durability Properties of Concrete Containing Pumice and Scoria as Supplementary Cementitious Material

Chambua

Jande

Machunda

2021

Advances in Materials Science and Engineering

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show abstract

“…Mangi et al [12] also showed that admixture of coal bottom ash and cement can reduce the negative effect of sulphate and chloride on the performance of cement. The negative effect of sulphate on cement was also studied by Demir et al [13], and concluded that strength of specimens containing blend of cement with fly ash, bottom ash and blast furnace slag, cured in sodium sulphate solution for 360 days, increased by 2.0% compared to the controlled specimens. Thakare and Chauhan [14], treated soft black cotton soil with a mixture of micro-silica, lime and fly ash for pavement, and observed that with addition of 5% micro-silica, 3% lime and 3% fly ash, the CBR value increased by 3.8 times that of the unstabilized soil.…”

Section: Introductionmentioning

confidence: 90%

Microstructural Investigation and Strength Properties of Clay Stabilized With Cement, Rice Husk Ash and Promoter

et al. 2020

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A clay soil, classified as Clay of High plasticity (CH) according to Unified Soil Classification System (USCS) was stabilized with cement, Rice Husk Ash (RHA) and promoter. The mineralogy of the clay soil and the morphology of the clay and clay specimens admixed with varied composition of cement, RHA and promoter were evaluated in order to determine effect of the RHA on promoter stabilization of cement based clay soil. The promoter used in this study consists of calcium chloride and sodium hydroxide in the ratio of 1:1. The clay was remolded at standard Proctor compaction energy and the specimens were mixed with 0, 1.0, 2.0 and 3.0% cement, admixed with 1.0, 2.0, 3.0% RHA each, and 0.3, 0.6, 1.0% promoter each. The molded specimens were cured for 1, 7, 14, 28, 60 and 90days before testing for Unconfined Compressive Strength (UCS) and consequently the modulus of elasticity. The UCS of specimens without cement increased from 20 kN/m2 for the natural clay soil to 95 kN/m2 on addition of 3% RHA and 1.0% promoter after 28 days of curing, representing 475% increase in the UCS. This increase was confirmed by morphology of the clay soil mixed with RHA and promoter only, which showed presence of calcium silicate hydrate. Addition of 3.0% cement with 3 and 1.0% RHA and promoter respectively, increased the UCS from 220 to 375kN/m2 after 28 days of curing, which was also confirmed by the morphology of the specimens. The highest elastic modulus of 48.3 MPa was observed at specimens containing 3% cement, 3% RHA and 1.0% promoter.

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“…The blast furnace slag, y ash, bottom ash represents the majority of supplementary cementitious materials. The utilization of supplementary cementitious materials as a component of concrete happened to ordinary [14][15][16][17][18][19][20][21][22][23]. It has been shown in the literature that the use of supplementary cementitious materials as cement additive improves the mechanical and durability properties of concrete [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Comparison of the influence of silica-rich supplementary cementitious materials on cement mortar composites: Mechanical and microstructural assessment

Sevim

Sengul

2021

Preprint

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The silica-rich supplementary cementitious materials (SCMs) are the key components of mechanical and microstructural properties. The use of SCMs results in improving the mechanical and microstructural properties and decreasing the environmental burden caused by cement production. In this regard, this paper reports a study to compare the influence of silica-rich supplementary cementitious materials (slag, fly ash, and bottom ash) having similar Blaine fineness on cement mortar composites in terms of mechanical and microstructural properties. First, supplementary cementitious materials (slag, fly ash, and bottom ash) were ground at similar cement Blaine fineness (~ 3300 cm2/g) and then by replacing 5% and 20% with cement, the 7-, 28-, 90-day mechanical and microstructural properties of cement mortar composites incorporating SCMs were examined. As a result, it was observed that the compressive strength and microstructural properties of cement mortar composites incorporating slag gave maximum strength and microstructural properties according to samples with fly ash and bottom ash having similar fineness and this will decrease the required amount of cement for the target properties by using slag, thus the number of CO2 emitted to nature will also decrease.

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Effects of sulfate on cement mortar with hybrid pozzolan substitution

Cited by 37 publications

References 29 publications

Strength and Durability Properties of Concrete Containing Pumice and Scoria as Supplementary Cementitious Material

Strength and Durability Properties of Concrete Containing Pumice and Scoria as Supplementary Cementitious Material

Microstructural Investigation and Strength Properties of Clay Stabilized With Cement, Rice Husk Ash and Promoter

Comparison of the influence of silica-rich supplementary cementitious materials on cement mortar composites: Mechanical and microstructural assessment

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