The effect of metakaolin and end type of steel fiber on fiber-SIFCON matrix bond characteristics

Yalçınkaya, Çağlar; Beglarigale, Ahsanollah; Yazıcı, Halit

doi:10.12748/uujms.201416504

Cited by 6 publications

(4 citation statements)

References 23 publications

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“…Similarly, Lee et al (2012) [179] reported that the addition of metakaolin and silica fume efficiently improves the polyvinyl alcohol fiber-cement mortar bond strength by an optimum dosage of 10% for metakaolin. The literature confirmed these promising results for metakaolin and nano-clay with specific dosages [180,181].…”

Section: Bond Strengthsupporting

confidence: 57%

Clay as a Sustainable Binder for Concrete—A Review

Mousavi

Bhojaraju²,

Ouellet-Plamondon

2021

Construction Materials

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The negative environmental impacts of Portland cement as a binder in the construction industry have created a growing impetus to develop sustainable alternative binders. Various types of clay have been considered as potential cement replacements. The impact of clays as cement replacement depends on the dosage and treatment methods. This paper presents a comprehensive review to determine the effects of different types of clay on the fresh and hardened properties of concrete mixtures by analyzing the experimental database reported by the literature, including raw, calcined, modified, nano, and organo. This study intends to show the process of optimizing the use of clay in concrete, the reason behind converting raw clay to modified types, and research gaps through a comparison study between different types of clays. The present review study shows that clay-based concrete mixtures have higher thixotropy and yield stress values, improving shape stability. This results in lower early-age shrinkage of the concrete. However, the high floc strength of clay-based concrete causes a reduction in flowability. Treatment methods of raw clay, such as calcination and nano-sized clay particles, improve concrete compressive strength. General results of the previous studies highlight that all types of clay investigated positively affect the resistance of concrete to environmental attack.

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Section: Bond Strengthsupporting

confidence: 57%

Clay as a Sustainable Binder for Concrete—A Review

Mousavi

Bhojaraju²,

Ouellet-Plamondon

2021

Construction Materials

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“…In limited studies, the effect of silica fume, metakaolin, slag and fly ash on the bond behaviour of fibres in cement matrix are evaluated. Yalcinkaya et al [9] reported about 12% and 10% increase in pull-out load of hook end steel fibre in cement matrix due to partial replacement of cement with 15% and 30% metakaolin, respectively. In the case of straight steel fibre this improvement was below 5% in both metakaolin contents.…”

Section: Introductionmentioning

confidence: 99%

Effect of nano and micro-silica on bond behaviour of steel and polypropylene fibres in high volume fly ash mortar

Shaikh

Shafaei

Sarker

2016

Construction and Building Materials

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This paper presents the effects of nano silica (NS), micro silica (MS) and combined NS and MS on bond behaviour of steel and polypropylene (PP) fibres in high volume fly ash (HVFA) mortar. Three types of bend configuration of hook-end steel fibre commercially available are considered, while the PP fibre was crimped shape. Three different fly ash contents of 40%, 50% and 60% (by wt.) as partial replacement of ordinary Portland cement (OPC) are considered in HVFA mortar, while a control mortar containing 100% OPC was also considered. The NS and the MS was added as 2% and 10% (by wt.), respectively as partial replacement of OPC in HVFA mortar containing 40% fly ash. In the case of combined NS and MS, 2% NS and 10% MS was used as partial replacement of OPC in HVFA mortar. However, in the case of HVFA mortars containing 40% fly ash and different NS and MS, total OPC content of 60% was kept constant in all HVFA mixes containing NS, MS and NS+MS. This was considered to compare these mixes with HVFA mortar containing 40% fly ash. Results indicate that maximum pull-out force of both steel and PP fibres decreases with increase in fly ash contents in HVFA mortars at both 7 and 28 days. The addition of 2% NS and 10% MS showed almost similar improvement in the maximum pull-out force of steel and PP fibres at both ages in HVFA mortar containing 40% fly ash. The combined use of 2%NS+10%MS also improved the maximum pull-out force and higher than 2% NS and 10% MS. The reduction in large capillary pores in HVFA mortars containing nano and micro silica observed in Mercury Intrusion Porosity test improved the bond of steel and PP fibres in those mortar due to formation of additional calcium silicate hydrate (C-S-H) gel is believed to be the reason behind this improvement. The maximum pull-out force also increased with increase in number of bends in the hook-end of steel fibre in all mortars in this study at both 7 and 28 days. Extra energy absorbed by the higher number of bends is the reason of such improvement in maximum pull-out force. However, in the case of absorbed energy mixed results are observed in the case of different number of bends in steel fibre ends. Good correlations also exist between the maximum pull-out forces of all three types of steel fibres with compressive strength of mortars showing strong influence on the bond behaviour.

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“…This study aimed to systematically investigate the effects of UV radiation on the carbonation behaviour of cement-based materials and clarify the related mechanism and thus establish a theoretical and experimental basis for engineering cement-based materials. Three SCMs, namely silica fume (SF), blast furnace slag (GGBS), and metakaolin (MK), were selected to partially replace cement in the preparation of cement pastes, which were subsequently subjected to UV and standard (non-UV) curing after hardening [19][20][21][22][23]. The pH of the paste at different depths from the exposed surface was evaluated for each layer to characterise the effect of the UV radiation depth.…”

Section: Introductionmentioning

confidence: 99%

Effects of UV Radiation on the Carbonation of Cement-Based Materials with Supplementary Cementitious Materials

Shui

Wang

et al. 2023

Coatings

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Solar light with high-energy ultraviolet (UV) radiation acting on the surface of cement-based materials easily changes the properties of cement-based materials by affecting their carbonation reaction. In order to elucidate the difference in the carbonation process under UV radiation in cement-based materials with different supplementary cementitious materials (SCMs), the carbonation depth (apparent pH values), chemical composition (XRD, FTIR, and TG analysis), and mechanical properties (compressive strength and microhardness) of cement-based materials were evaluated. The results revealed that UV radiation acting on the surface of cement-based materials accelerated the carbonation reaction, which enhanced the decrease rate of pH and formation of stable calcite, thereby improving the macromechanical and micromechanical properties of cement-based materials. In addition, the carbonation process under UV radiation differs according to the added SCM. In particular, silica fume substantially increased the carbonation of cement-based materials under UV radiation, resulting in a 53.3% increase in calcium carbonate coverage, a 10.0% increase in compressive strength, and a 20.9% increase in mean microhardness, whereas the incorporation of blast furnace slag resulted in a smaller effect on UV irradiation-induced carbonation. In addition, UV radiation facilitates the crystallographic transformation process of cement-based materials containing metakaolin, resulting in more stable crystals of carbonation products. This study provides a theoretical framework and serves as an important reference for the design of cement-based materials under strong UV radiation for practical engineering applications.

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The effect of metakaolin and end type of steel fiber on fiber-SIFCON matrix bond characteristics

Cited by 6 publications

References 23 publications

Clay as a Sustainable Binder for Concrete—A Review

Clay as a Sustainable Binder for Concrete—A Review

Effect of nano and micro-silica on bond behaviour of steel and polypropylene fibres in high volume fly ash mortar

Effects of UV Radiation on the Carbonation of Cement-Based Materials with Supplementary Cementitious Materials

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