Improvement of the Early-Age Compressive Strength, Water Permeability, and Sulfuric Acid Resistance of Scoria-Based Mortars/Concrete Using Limestone Filler

al-Swaidani, Aref M.; Soud, Andraos; Hammami, Amina

doi:10.1155/2017/8373518

Cited by 14 publications

(5 citation statements)

References 43 publications

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“…The enhancement in the microstructure in the mixtures with volcanic scoria can be attributed to the formation of additional C-S-H, which generally fills in the pores, creates denser hydration products and accordingly reduces the permeability [63]. Similar observations were also reported in the literature [71,72].…”

Section: Microstructuresupporting

confidence: 81%

“…This can be explained by the reduction of hydration heat on the binder system with the presence of VS [91]. A significant relationship (R 2 ≈ 0.9) between initial and final setting times was obtained by the author depending on data collected from other papers [20,62,71,72,75,79,89,91], as clearly shown in Figure 4. So, knowing initial setting time, the final setting time of the VS-based cement paste can be predicted by using the equation shown in Figure 4.…”

Section: Setting Timesmentioning

confidence: 86%

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Volcanic Scoria as Cement Replacement

al-Swaidani¹

2018

Volcanoes - Geological and Geophysical Setting, Theoretical Aspects and Numerical Modeling, Applications to Industry and Their

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Numerous volcanic scoria (VS) cones are found in many places of the world. Many of them have not yet been investigated, although few have been used as binders for a very long time. The use of natural pozzolans as cement replacement could be considered as a common practice in the construction industry due to the related economic, ecologic and performance benefits. This chapter highlights the advantages and disadvantages of the use of volcanic scoria as cement replacement in concrete mixes in terms of fresh and hardened concrete properties. The chemical and mineralogical composition of volcanic scoria samples collected from 36 countries is presented in this chapter, with some further analysis. The effects of using volcanic scoria as cement replacement on some paste, mortar and concrete properties, such as the setting times, the heat of hydration, the compressive strength, the water permeability and the chloride penetrability, have been studied. The improvement in resistance against the chemical attack of volcanic scoria-based cement mortar has also been highlighted. Some estimation equations depending on the data available in literature have also been derived from the analyzed data. The modification of the microstructure of VS-based cement paste has been confirmed, as well.

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Section: Microstructuresupporting

confidence: 81%

Section: Setting Timesmentioning

confidence: 86%

Volcanic Scoria as Cement Replacement

al-Swaidani¹

2018

Volcanoes - Geological and Geophysical Setting, Theoretical Aspects and Numerical Modeling, Applications to Industry and Their

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“…The control specimen has a compressive strength of 2.407 MPa at one day; 10 and 20 PSBE specimens have compressive strengths lower than the control specimen, while 30 and 40 PSBE specimens have not developed enough strength to be tested. A low early strength, especially before seven days, is common for cementitious product with pozzolanic material as partial cement replacement [ 38 ]. At seven days, the control mortar has a compressive strength of 9.277 N/mm 2 , but 10 and 20 PSBE specimens achieve higher strengths of 10.471 N/mm 2 and 9.436 N/mm 2 , respectively.…”

Section: Resultsmentioning

confidence: 99%

Image Analysis of Surface Porosity Mortar Containing Processed Spent Bleaching Earth

et al. 2021

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Image analysis techniques are gaining popularity in the studies of civil engineering materials. However, the current established image analysis methods often require advanced machinery and strict image acquisition procedures which may be challenging in actual construction practices. In this study, we develop a simplified image analysis technique that uses images with only a digital camera and does not have a strict image acquisition regime. Mortar with 10%, 20%, 30%, and 40% pozzolanic material as cement replacement are prepared for the study. The properties of mortar are evaluated with flow table test, compressive strength test, water absorption test, and surface porosity based on the proposed image analysis technique. The experimental results show that mortar specimens with 20% processed spent bleaching earth (PSBE) achieve the highest 28-day compressive strength and lowest water absorption. The quantified image analysis results show accurate representation of mortar quality with 20% PSBE mortar having the lowest porosity. The regression analysis found strong correlations between all experimental data and the compressive strength. Hence, the developed technique is verified to be feasible as supplementary mortar properties for the study of mortar with pozzolanic material.

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“…The samples were tested to determine their effectiveness in an acidic environment. The samples were immersed in 3% Sulphuric acid (H 2 SO 4 ) solution for 90 days [36,37]. The pH value of the acid solution was maintained at 0.3 throughout the test.…”

Section: Acid Attack Testmentioning

confidence: 99%

Effect of Hybrid Fibres on the Durability Characteristics of Ternary Blend Geopolymer Concrete

2021

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The need to develop sustainable concrete in the civil infrastructure industry increases day by day, resulting in new eco-friendly materials such as geopolymer concrete. Geopolymer concrete is one of the eminent alternatives to conventional concrete for sustainable development by reducing the carbon footprint. Ternary blend geopolymer concrete (TGPC) is a sustainable and environmentally friendly concrete produced with three different source materials to form a binder. The main advantage of TGPC is that it possesses densely packed particles of different shapes and sizes, which results in improved properties. This paper deals with the experimental investigations to evaluate the durability properties of plain and hybrid fibre reinforced TGPC. The durability of concrete is defined as the ability to withstand a safe level of serviceability and different environmental exposure conditions without any significant repair and rehabilitation throughout the service life. Conventional concrete is vulnerable to cracking due to its low tensile and durability properties. The TGPC considered in this work consists of fly ash, GGBS and metakaolin as source materials, selected mainly based on the material’s silica and alumina content, shape, size, and availability. The grade of concrete considered was M55. The main variables considered in this study were the proportions of crimped steel fibres (Vf), viz., 0.5% and 1% and proportions of polypropylene fibres (Vp)viz., 0.1%, 0.15%, 0.20% and 0.25%. The durability properties like water absorption, sorptivity, resistance to marine attack, acid attack, sulphate attack, and abrasion were studied in this investigation. The experimental test results were compared with the requirements provided in the standard/literature and found to be well within limits. The study also indicates that the inclusion of fibres in a hybrid form significantly improves the durability parameters of TGPC. The TGPC with 1% steel fibre and 0.15% polypropylene fibre performs better than the other combination of fibres considered in this experimental investigation.

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Improvement of the Early-Age Compressive Strength, Water Permeability, and Sulfuric Acid Resistance of Scoria-Based Mortars/Concrete Using Limestone Filler

Cited by 14 publications

References 43 publications

Volcanic Scoria as Cement Replacement

Volcanic Scoria as Cement Replacement

Image Analysis of Surface Porosity Mortar Containing Processed Spent Bleaching Earth

Effect of Hybrid Fibres on the Durability Characteristics of Ternary Blend Geopolymer Concrete

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