Microstructural verification of the strength performance of ternary blended cement systems with high volumes of fly ash and GGBFS

Jeong, Yeonung; Park, Hyeoneun; Jun, Yubin; Jeong, Jae-Hong; Oh, Jae Eun

doi:10.1016/j.conbuildmat.2015.07.158

Cited by 81 publications

(35 citation statements)

References 29 publications

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“…The thermogravimetric analysis (TGA) results of 28-day cured samples are presented with derivative thermogravimetry (DTG) in Figure 5, where identified phases are labeled. The identified peaks were attributed to C-S-H [10,24,27], ettringite [16,24,27], calcite [27][28][29], gypsum [30], and U-phase [31][32][33], which were confirmed by the XRD results. The CA-A and CG-A samples showed notably strong peaks of ettringite, but the NA-A and NG-A samples barely exhibited these.…”

Section: Tgasupporting

confidence: 53%

Influence of Calcium Sulfate Type on Evolution of Reaction Products and Strength in NaOH- and CaO-Activated Ground Granulated Blast-Furnace Slag

et al. 2018

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This study investigated the influences of CaSO4 type (i.e., anhydrite vs. gypsum) on strength development and reaction products in the activation of ground granulated blast-furnace slag (GGBFS) when different activators (i.e., CaO vs. NaOH) and sources of GGBFS were used. In the CaO-activation, the addition of calcium sulfates greatly enhanced 28-day strengths, regardless of the choice of CaSO4 or GGBFS source, through increasing the quantities of reaction products and reducing pore volume and size. However, in the NaOH-activation, the use of calcium sulfates showed the complex dependency of strength on the choice of CaSO4 type and GGBFS source, and it barely produced beneficial effects on the quantity of reaction products and reduction of pore volume and size. Thus, the results in this study indicate that the combination of CaO-activation and calcium sulfates is a more effective means of activating GGBFS to gain enhanced strength and significant quality control than the use of gypsum with NaOH-activation.

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Section: Tgasupporting

confidence: 53%

Influence of Calcium Sulfate Type on Evolution of Reaction Products and Strength in NaOH- and CaO-Activated Ground Granulated Blast-Furnace Slag

et al. 2018

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“…suitable for high performance construction materials (Constantinides et al 2003;Jeong et al 2015;Le et al 2014;Sriravindrarajah et al 2012;Divsholi et al 2014;Sorensen et al 2014). Based on the progress in concrete technology, high strength concrete (HSC) with compressive strength of 100 MPa or above has been developed and applied in various construction fields.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Modeling of Amorphous Metallic Fiber-Reinforced Concrete in Compression

Dinh

Kim

2016

Int J Concr Struct Mater

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The aim of this paper is to investigate the compressive behavior and characteristics of amorphous metallic fiberreinforced concrete (AMFRC). Compressive tests were carried out for two primary parameters: fiber volume fractions (V f ) of 0, 0.3, 0.6 and 0.8 %; and design compressive strengths of 27, 35, and 50 MPa at the age of 28 days. Test results indicated that the addition of amorphous metallic fibers in concrete mixture enhances the toughness, strain corresponding to peak stress, and Poisson's ratio at high stress level, while the compressive strength at the 28-th day is less affected and the modulus of elasticity is reduced. Based on the experimental results, prediction equations were proposed for the modulus of elasticity and strain at peak stress as functions of fiber volume fraction and concrete compressive strength. In addition, an analytical model representing the entire stress-strain relationship of AMFRC in compression was proposed and validated with test results for each concrete mix. The comparison showed that the proposed modeling approach can properly simulate the entire stress-strain relationship of AMFRC as well as the primary mechanical properties in compression including the modulus of elasticity and strain at peak stress.

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“…이러한 다양한 혼화재료를 사용한 TBC는 서로 다른 혼화재 료들의 상호보완효과와 충전효과에 의해 성능 향상을 통해 다양한 장점을 나타내고 있다. 특히 염해저하성과 황산염 저 항성의 증대, 알칼리 실리카 반응의 억제, 장기강도의 증가 등 의 우수한 특성이 발견되었다 (Jones et al, 1997;Kim et al, 2012;Jeong et al, 2015). 또한 기존의 연구결과를 통해 다양 한 노출환경과 미세구조 등에 대한 연구도 많이 이루어지고 있다 (Erdem and Kırca, 2008;Turk, 2012;Boháč et al, 2014;Berodier and Scrivener, 2015).…”

Section: 서 론unclassified

The Effects of Self-Healing for Ternary Blended Cement in Tap-water and Sea-water

Kim¹

2016

Journal of the Korea institute for structural maintenance and i

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The objective of this study is to investigate the self-healing properties of ternary blended cement(TBC) paste made with OPC, GGBFS and FA. The influence of OPC-GGBFS-FA on the self-healing ability of ternary blended cement paste was researched by ultrasonic pulse velocity(UPV) measurement. The TBC paste with GGBFS-FA replacement ratios of 20%, 40% and 60% were prepared having a constant water-cementitious materials ratios os 0.5. The research focuses on behavior after 28days(after loading). Four-point bending tests are used to pre-cracked the prismatic specimens at 28days. For specimens (uncracked and cracked) submerged in tap-water and sea-water until 60days. According to the experimental results, the TBC paste system has self-healing ability increased when the fraction of GGBFS increased. Because GGBFS and FA continues to hydrate after 28days, it is likely that hydrated products from GGBFS and FA may modify microstructures, seal these cracks. From these results, it is clear that the crack in all samples experience self-healing and that this occurs mostly in the first 30days of submerging. Futhermore, most of the healing for both specimens of submerged in sea-water and tap-water occurred during the first 30days. Sea-water submerged specimens healed cracks as fast as those in tap-water. Differences in healing effects of submerged in sea-water and tap-water may be attributed to the presence of specific sea-water ions. Therefore, self-healing effects considered age-effects was more strong effect occurred mostly in the first 30days, and then gradually weaken.

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Microstructural verification of the strength performance of ternary blended cement systems with high volumes of fly ash and GGBFS

Cited by 81 publications

References 29 publications

Influence of Calcium Sulfate Type on Evolution of Reaction Products and Strength in NaOH- and CaO-Activated Ground Granulated Blast-Furnace Slag

Influence of Calcium Sulfate Type on Evolution of Reaction Products and Strength in NaOH- and CaO-Activated Ground Granulated Blast-Furnace Slag

Mechanical Properties and Modeling of Amorphous Metallic Fiber-Reinforced Concrete in Compression

The Effects of Self-Healing for Ternary Blended Cement in Tap-water and Sea-water

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