The effects of calcium stearate on mechanical and durability aspects of self-consolidating concretes incorporating silica fume/natural zeolite

Naseroleslami, Ramin; Chari, Mehdi Nemati

doi:10.1016/j.conbuildmat.2019.07.144

Cited by 31 publications

(31 citation statements)

References 28 publications

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“…Capillary penetration and water absorption were significantly decreased by the addition of Calcium Stearate (CS). After 120 days of wet curing, the integration of 7 kg/m 3 of CS in concrete, decreased the electrical resistivity, total water absorption, and chloride diffusivity by 60%, 72%, and 40%, respectively, compared to the reference mixture without CS and additives [19].…”

Section: Introductionmentioning

confidence: 94%

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Experimental and Analytical Study of High-Strength Concrete Containing Natural Zeolite and Additives

Iswarya

Beulah

2022

Civ Eng J

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The study compares the durability of Natural Zeolite with Metakaolin, Silica Fume, and Fly Ash on high-strength concrete. 300 concrete specimens were tested for compressive strength before and after an acid attack, modulus of elasticity, water absorption, and rapid chloride permeability. 5%, 10%, and 15% of the cement were replaced with cementitious elements while maintaining the same quantity of Natural Zeolite. In this investigation, the water-cement ratio was maintained at 0.35. After 28 days, the specimens were tested for durability. Samples of all mixes were TG/DT and FTIR tested. The optimal percentages of cementitious materials that resulted to the maximum durability enhancements were reported as the study results. Experimental results showed that Natural Zeolite and Metakaolin strengthened the durability of concrete. All the data show that 5% Natural Zeolite with 10% Metakaolin performs well. Good R2values and appropriate independent variable coefficients suggested that the regression findings for high-strength concrete durability were accurate. The P values of all models were less than 0.005 and the F values were statistically significant and appropriate; therefore, the generated models predict concrete's strength with authenticity. Doi: 10.28991/CEJ-2022-08-10-019 Full Text: PDF

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Section: Introductionmentioning

confidence: 94%

“…𝑀 ) + 2.07 𝑅2 = 72% (18) AAt 𝑀𝑃𝑎 = −0.01(𝑍 + 𝐹𝑙𝑦. 𝑀 ) + 2.53 𝑅2 = 64% (19) AAt 𝑀𝑃𝑎 = 0.77 (𝑍 + 𝑆𝑖𝑙. 𝑀 ) + 43.44 𝑅2 = 69% (20) For different mix proportions of cement additives, Equations 12 to 14 were developed to predict the RCPT values for MK, FA, and SF respectively.…”

Section: Declarationsmentioning

confidence: 99%

Experimental and Analytical Study of High-Strength Concrete Containing Natural Zeolite and Additives

Iswarya

Beulah

2022

Civ Eng J

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“…In addition, Najimi et al showed that replacing 15% and 30% of cement weight with NZ noticeably increased 30‐min water absorption 26 but some other researchers showed that replacing various percentages of cement with SF or NZ reduced 30‐min water absorption by approximately 25% 19,27 . There is also no consensus among researchers on the effect of SF on water absorption after longer periods of immersion in water because positive and negative effects of SF on 1‐day and 3‐day water absorption have been reported by previous research projects 20,24,25 . Positive and negligible effects of NZ on capillary water absorption, which is another index of permeability under nonhydrostatic pressure, have been also reported by previous researchers 21,24 .…”

Section: Introductionmentioning

confidence: 99%

“…However, the effects of SF and NZ on permeability under nonhydrostatic pressure are not as clear as their effects on permeability under hydrostatic pressure. Some research projects showed that replacing different percentages of cement weight with SF and NZ had negligible effect on the 30‐min water absorption of concrete 20,24–26 . In addition, Najimi et al showed that replacing 15% and 30% of cement weight with NZ noticeably increased 30‐min water absorption 26 but some other researchers showed that replacing various percentages of cement with SF or NZ reduced 30‐min water absorption by approximately 25% 19,27 .…”

Section: Introductionmentioning

confidence: 99%

Properties of cement‐based materials containing calcium stearate and supplementary cementitious materials

Chari¹,

Naseroleslami

Ahmadi³

2023

Structural Concrete

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Calcium stearate (CS) is effective to reduce permeability of different building materials under nonhydrostatic pressure but more actions need to be taken to shed light on its main and side effects on properties of cement‐based materials. This research project investigates the effect of CS on properties of these materials. Compressive strength analysis shows that the addition of CS at the dosage of 1% of cement weight reduces this parameter by approximately 20% but reducing water‐to‐binder ratio, and replacing 7.5% of cement weight with silica fume (SF) compensate for the strength loss caused by CS. Results of drying shrinkage test show that the addition of CS slightly increases drying shrinkage but replacing 7.5% of cement weight with SF can compensate for the negative effects of CS on drying shrinkage. Permeability analysis shows that CS is not as effective as SF and natural zeolite (NZ) to improve impermeability under hydrostatic pressure but it is more effective than SF and NZ to improve impermeability under nonhydrostatic pressure because the addition of CS at the dosage of 1% of cement weight reduces capillary water absorption by roughly 60%. Therefore, the simultaneous use of CS and these supplementary cementitious materials improves not only impermeability under hydrostatic pressure but also impermeability under nonhydrostatic pressure.

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“…Additionally, apply ESP to replace sand at RL of 5% to 50% was found to reduce compressive and flexural strengths but improve the radiation absorption property of mortar [13]. According to Naseroleslami and Nemati Chari [14], "CS is a cost-efficient and easily processed damp-proofing admixture which is derived from the reaction of acid stearic and limestone". Damp-proofing admixtures are able to form a water-repellent layer along with the pores and restrict moisture from transfer into capillary pores.…”

Section: Introductionmentioning

confidence: 99%

Dimensional Stability of Lightweight Foamed Concrete Containing Eggshell Powder and Calcium Stearate

Yong

Kang

Ling

2022

IJIE

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In order to reduce eggshell (ES) waste and reduce utilization of pure cement, various researches were conducted to study effects of eggshell powder (ESP) on properties of concrete when it partially replaces ordinary Portland cement (OPC). Dimensional stability is one of the properties that related to cracking issue and soundness of concrete, and it is generally guided by movement of moisture. This study was conducted to study the dimensional stability of lightweight foamed concrete (LFC) that containing eggshell powder and calcium stearate (CS), where, replacement level (RL) of eggshell powder ranged from 0% to 10% at interval of 2.5%, and additional of 1% calcium stearate as cement mass applied for the mixture containing 0% and 5% eggshell powder. Besides, sorptivity and initial surface absorption were tested to compare with dimensional changes, and compressive strength was tested to confirm the additives have no significant adverse effect on the strength. The result shows that incorporation of 5% eggshell powder improves sorptivity, initial surface absorption, and dimensional stability (outdoor R² value) of the lightweight foamed concrete by 33%, 55%, and 1.5% respectively, meanwhile, additional of 1% calcium stearate improves these properties by average 79%, 78%, and 7.2% respectively.

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The effects of calcium stearate on mechanical and durability aspects of self-consolidating concretes incorporating silica fume/natural zeolite

Cited by 31 publications

References 28 publications

Experimental and Analytical Study of High-Strength Concrete Containing Natural Zeolite and Additives

Experimental and Analytical Study of High-Strength Concrete Containing Natural Zeolite and Additives

Properties of cement‐based materials containing calcium stearate and supplementary cementitious materials

Dimensional Stability of Lightweight Foamed Concrete Containing Eggshell Powder and Calcium Stearate

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