Alumina-rich pozzolan modification on Portland-limestone cement concrete: Hydration kinetics, formation of hydrates and long-term performance evolution

Wang, Yunyao; Shui, Zhonghe; Wang, Leichong; Gao, Xiaojian; Huang, Yun; Song, Qiulei; Liu, Kaizhi

doi:10.1016/j.conbuildmat.2020.119712

Cited by 27 publications

(11 citation statements)

References 48 publications

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“…The pozzolanic reaction of the BFS improved the compressive strength. The Hc and Mc produced by the synergistic action of LF and BFS contributed to the compressive strength [25].…”

Section: Compressive Strengthmentioning

confidence: 95%

“…Third, BFS undergoes pozzolan reactions to produce additional C-S-H. Menéndez et al [7] also indicated that BFS facilitates the development of late compressive strength. Finally, the synergistic effect of LF and BFS produces hemicarboaluminate (Hc) and monocarboaluminate (Mc) [25]. Adu-Amankwah et al [26] clarified that calcite reacts with aluminum phase to produce Hc and Mc, which stabilizes ettringite, reduces porosity, and contributes to both early and late compressive strength.…”

Section: Compressive Strengthmentioning

confidence: 99%

“…Pozzolanic reactions consume portlandite, resulting in a significant decrease in calcium hydroxide content as the replacement rate increases. Due to the presence of BFS (containing aluminum phase) in the mixture, it reacts with LF to form Mc and Hc [25]. The formation of Hc can be observed at 3 days, but as the hydration reaction proceeds, the Hc content decreases, and Mc is formed [52,53].…”

Section: Xrdmentioning

confidence: 99%

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The Hydration, Mechanical, Autogenous Shrinkage, Durability, and Sustainability Properties of Cement–Limestone–Slag Ternary Composites

2021

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This study examines the hydration–mechanical–autogenous shrinkage–durability–sustainability properties of ternary composites with limestone filler (LF) and ground-granulated blast furnace slag (BFS). Four mixtures were prepared with a water/binder ratio of 0.3 and different replacement ratios varying from 0 to 45%. Multiple experimental studies were performed at various ages. The experimental results are summarized as follows: (1) As the replacement levels increased, compressive strength and autogenous shrinkage (AS) decreased, and this relationship was linear. (2) As the replacement levels increased, cumulative hydration heat decreased. At the age of 3 and 7 days, there was a linear relationship between compressive strength and cumulative hydration heat. (3) Out of all mixtures, the ultrasonic pulse velocity (UPV) and electrical resistivity exhibited a rapid increase in the early stages and tended to slow down in the latter stages. There was a crossover of UPV among various specimens. In the later stages, the electrical resistivity of ternary composite specimens was higher than plain specimens. (4) X-ray diffraction (XRD) results showed that LF and BFS have a synergistic effect. (5) With increasing replacement ratios, the CO2 emissions per unit strength reduced, indicating the sustainability of ternary composites.

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“…The pozzolanic reaction of the BFS improved the compressive strength. The Hc and Mc produced by the synergistic action of LF and BFS contributed to the compressive strength [25].…”

Section: Compressive Strengthmentioning

confidence: 95%

Section: Compressive Strengthmentioning

confidence: 99%

Section: Xrdmentioning

confidence: 99%

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The Hydration, Mechanical, Autogenous Shrinkage, Durability, and Sustainability Properties of Cement–Limestone–Slag Ternary Composites

2021

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“…Limestone composite cement production requires less energy and emits less carbon dioxide, meaning that it has a better environmental performance than other types of cements [ 7 ]. The use of limestone to replace cement has been approved in many standards, such as the Canadian Standards Association (since 1983) [ 8 ], the European standard EN 197-1 (since 2000) [ 9 ], and ASTM C150 (since 2004) [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Calcium Nitrate on the Properties of Portland–Limestone Cement-Based Concrete Cured at Low Temperature

et al. 2021

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The effect of calcium nitrate (CN) dosages from 0 to 3% (of cement mass) on the properties of fresh cement paste rheology and hardening processes and on the strength of hardened concrete with two types of limestone-blended composite cements (CEM II A-LL 42.5 R and 42.5 N) at different initial (two-day) curing temperatures (−10 °C to +20 °C) is presented. The rheology results showed that a CN dosage up to 1.5% works as a plasticizing admixture, while higher amounts demonstrate the effect of increasing viscosity. At higher CN content, the viscosity growth in normal early strength (N type) cement pastes is much slower than in high early strength (R type) cement pastes. For both cement-type pastes, shortening the initial and final setting times is more effective when using 3% at +5 °C and 0 °C. At these temperatures, the use of 3% CN reduces the initial setting time for high early strength paste by 7.4 and 5.4 times and for normal early strength cement paste by 3.5 and 3.4 times when compared to a CN-free cement paste. The most efficient use of CN is achieved at −5 °C for compressive strength enlargement; a 1% CN dosage ensures the compressive strength of samples at a −5 °C initial curing temperature, with high early strength cement exceeding 3.5 MPa but being less than the required 3.5 MPa in samples with normal early strength cement.

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“…Furthermore, FA activated by quicklime hydration participates in the hydration reaction and decreases pH with increasing curing time. This is not desirable for subsequent pozzolanic reactions [ 42 , 45 , 46 , 47 ]. Hence, inadequate hydration of blended binders causes a slow increase in mechanical performance within the hydration time of 7–28 days.…”

Section: Resultsmentioning

confidence: 99%

Quicklime and Calcium Sulfoaluminate Cement Used as Mineral Accelerators to Improve the Properties of Cemented Paste Backfill with a High Volume of Fly Ash

Ding

Zhang

2020

Materials

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In order to reduce the CO2 emission and cost of binders used in cemented paste backfill (CPB) technology, new blended binders with a large amount of fly ash (FA) were fabricated. Different doses of quicklime and calcium sulfoaluminate cement (CṠA) were used as mineral accelerators to improve the early workability of CPB. The effects of CṠA and quicklime on flowability, compressive strength, pore structure, hydration heat, and hydration evolution were investigated experimentally. The results showed that the addition of quicklime and CṠA reduced the spread diameter of the fresh backfill and improved the mechanical performance of the hardened CPB. With increasing quicklime and CṠA, the cumulative hydration heat of the blended binder distinctly increased in the first 6 h. CṠA improved the initial hydration by increasing the reactivity, and quicklime increased the hydration rate by activating FA. The blended binder (15% quicklime + 10% CṠA) with the lowest CO2 emission and cost had potential application in filling technology.

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Alumina-rich pozzolan modification on Portland-limestone cement concrete: Hydration kinetics, formation of hydrates and long-term performance evolution

Cited by 27 publications

References 48 publications

The Hydration, Mechanical, Autogenous Shrinkage, Durability, and Sustainability Properties of Cement–Limestone–Slag Ternary Composites

The Hydration, Mechanical, Autogenous Shrinkage, Durability, and Sustainability Properties of Cement–Limestone–Slag Ternary Composites

Effect of Calcium Nitrate on the Properties of Portland–Limestone Cement-Based Concrete Cured at Low Temperature

Quicklime and Calcium Sulfoaluminate Cement Used as Mineral Accelerators to Improve the Properties of Cemented Paste Backfill with a High Volume of Fly Ash

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