An investigation on Portland cement replaced by high-volume GGBS pastes modified with micro-sized metakaolin subjected to elevated temperatures

Rashad, Alaa M.; Sadek, Dina M.

doi:10.1016/j.ijsbe.2016.10.002

Cited by 79 publications

(28 citation statements)

References 28 publications

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“…Chloride penetrated to significantly different depths until 28 days of age because of the development of early strength owing to the EPC and PC-based superplasticizer, and the high fineness increased the watertightness of the concrete surface. After 28 days, the increased watertightness of the concrete caused by the action of GGBS [22][23][24][25] appears to have reduced the chloride penetration depth. Figure 10a shows the chloride ion diffusion coefficient of each concrete mix by age.…”

Section: Relation Between Chloride Penetration Depth and Compressive mentioning

confidence: 99%

“…Indeed, in many studies, C35 concrete (which has a characteristic strength of 35 MPa) or higher has been proposed as the minimum concrete mixture for structures in coastal areas [12,13,20,21]. In addition, the watertightness of the concrete structure can be increased using mineral admixtures, such as ground granulated blast-furnace slag (GGBS), fly ash, and silica fume [22][23][24][25]. Among them, using GGBS is recommended in coastal areas because it improves long-term watertightness [26][27][28][29] and has an excellent ability to immobilize chloride ions.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Chloride Resistance of Early-Strength Concrete Using Blended Binder and Polycarboxylate-Based Chemical Admixture

Lee¹,

Lee²

2020

Applied Sciences

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The mixing proportions of concrete were examined with regard to the durability performance and early strength in coastal areas. Research was conducted to improve the C24 mix (characteristic strength of 24 MPa). C35 concrete (characteristic strength of 35 MPa) was selected as a comparison group, as it exhibits the minimum proposed strength criterion for concrete in the marine environment. To secure the early strength of the C24 concrete, 50% of the total ordinary Portland cement (OPC) binder was replaced with early Portland cement (EPC); and to provide durability, 20% was substituted with ground granulated blast-furnace slag (GGBS). In addition, a polycarboxylate (PC)-based superplasticizer was used to reduce the unit water content. The compressive strength, chloride ion diffusion coefficient, chloride penetration depth, and pore structure were evaluated. After one day, the compressive strength improved by 40% when using EPC and GGBS, and an average increase of 20% was observed over 91 days. EPC and GGBS also reduced the overall porosity, which may increase the watertightness of concrete. The salt resistance performance was improved because the rapid early development of strength increased the watertightness of the surface and immobilization of chloride ions, decreasing the chloride diffusion coefficient by 50%.

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Section: Relation Between Chloride Penetration Depth and Compressive mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluation of Chloride Resistance of Early-Strength Concrete Using Blended Binder and Polycarboxylate-Based Chemical Admixture

Lee¹,

Lee²

2020

Applied Sciences

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“…When GGBS is used as a SCM, it improves durability, long-term strength, and constructability [2,3]. Given the high demand for natural resources to satisfy demands for infrastructure, there are significant opportunities to apply SCMs in the construction of carbon-saving infrastructure [4,5]. Furthermore, studies on AAMs have attracted considerable attention in the construction industry over the last few decades because it provides effective alternatives to OPC [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…Table 4 shows the mixing proportions of the concrete (ready-mixed concrete specification 25-24-180) used in the study. (1) W/B: water/binder ratio; (2) WSS: washed sea sand; (3) CS: crushed sand; (4) CGA: crushed granitic aggregate; (5) AD: chemical admixture; (6) B: unit binder weight. Table 5 shows the test methods with respect to the evaluation item in the study.…”

Section: Introductionmentioning

confidence: 99%

Durability and Engineering Performance Evaluation of CaO Content and Ratio of Binary Blended Concrete Containing Ground Granulated Blast-Furnace Slag

Lee¹,

Lee²

2020

Applied Sciences

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This study aimed to evaluate the durability and engineering performance of concrete mixed with locally produced ground granulated blast-furnace slag (GGBS) based on CaO content and ratio, and to derive the optimal CaO content range that can secure durability. Hence, tests were conducted by increasing the GGBS replacement ratio by 10% from 0% to 70%, while the unit binder weight was fixed at 330 kg/m3. The results indicated that the compressive strength exhibited a tendency to increase when the CaO content and basicity increased within 28 d of age, although similar compressive strength characteristics were observed at 56 d of age, irrespective of the CaO content and basicity. Additionally, four test items (i.e., carbonation depth, chloride penetration depth, relative dynamic elastic modulus, and weight reducing ratio) were measured to evaluate durability. The optimal CaO content satisfying all four parameters was observed as ranging between 53% and 56% (GGBS replacement ratio: 27.5%–47.1%). The results of the study can provide guidelines on the mixing proportions of GGBS concrete with excellent durability that can be applied to local construction sites and can be used as basic data to set chemical composition criteria for the development of binders to improve durability.

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“…The recent trend towards sustainability becomes inevitable in construction industries as large scale production of cement causing environmental impact and depletion of natural resources. Emission of SO₂ and NOx along with CO₂ released from cement industry can cause the greenhouse effect and acid rain [14,22] raising issues related to climate change, enhances serious consequences of rise in sea level . Thus importance has been given on optimum utilization of OPC by partially replacing it with various industrial by products such as Ground Granulated Blast Furnace Slag(GGBS), Alccofine and Silica fume [21].…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Microstructural Characteristics of Ternary Blended Mortars Incorporating GGBS and Alccofine Subjected to Acid and Sulphate Exposure

Mondal,

Ghosh,

Ghosh

2019

IJEAT

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This experimental study has been carried out to investigate the behavior of ordinary cement mortars and mortars containing ternary mixtures of supplementary cementitious materials(SCM’s) like Ground Granulated Blast Furnace Slag(GGBS), Alccofine along with cement,when subjected to exposure in magnesium sulphate and sulphuric acid solution. Mixes were prepared by replacing OPC with 30% and 50% by GGBS along with 5%,10% and 15% by Alccofine as additives . Compressive strength test were performed on different samples to observe SCMs behavior in different exposure conditions (acid and sulphate )after 56 days. Microstructure studies using scanning electron microscopy(SEM) and electron dispersive X-ray(EDX) analysis were performed on samples after different exposure conditions.

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An investigation on Portland cement replaced by high-volume GGBS pastes modified with micro-sized metakaolin subjected to elevated temperatures

Cited by 79 publications

References 28 publications

Evaluation of Chloride Resistance of Early-Strength Concrete Using Blended Binder and Polycarboxylate-Based Chemical Admixture

Evaluation of Chloride Resistance of Early-Strength Concrete Using Blended Binder and Polycarboxylate-Based Chemical Admixture

Durability and Engineering Performance Evaluation of CaO Content and Ratio of Binary Blended Concrete Containing Ground Granulated Blast-Furnace Slag

Mechanical and Microstructural Characteristics of Ternary Blended Mortars Incorporating GGBS and Alccofine Subjected to Acid and Sulphate Exposure

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