Use of calorimetry and thermal analysis to assess the heat of supplementary cementitious materials during the hydration of composite cementitious binders

Palou, Martin; Boháč, Martin; Kuzielová, Eva; Novotný, Radoslav; Žemlička, Matúš; Dragomirová, Janette

doi:10.1007/s10973-020-09341-3

Cited by 17 publications

(5 citation statements)

References 53 publications

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“…The formation of SCP hydrates phases was determined at 2, 7 and 28 days of hydration ( Figure 16 ). The mass loss between 50 °C and 140 °C is due to dehydration of the ettringite (E) and calcium silicate hydrates (C-S-H), as observed previously by [ 66 ], and increases with an increase in the hydration time for all the SCP specimens. The second mass loss is observed between 140 °C and 190 °C due to the dehydration of the monophases (AFm), similar to what was observed by [ 67 ], and is more pronounced in the SCP with RHA partial replacement in all hydration stages.…”

Section: Resultssupporting

confidence: 79%

Properties of Self-Compacting Concrete Produced with Optimized Volumes of Calcined Clay and Rice Husk Ash—Emphasis on Rheology, Flowability Retention and Durability

Muhammad

Thienel

2023

Materials

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The durability of concrete requires a dense microstructure which can be achieved by using self-compacting concrete (SCC). Both calcined clay (CC) and rice husk ash (RHA) are promising supplementary cementitious materials (SCMs) that can partially replace cement, but their use in SCC is critical due to their higher water demand (WD) and specific surface area (SSA) compared to cement. The effect of partial substitution of cement at 20 vol-% with binary and ternary blends of CC and RHA on flowability retention and durability of SCC was investigated. The empirical method of SCC design was adopted considering the physical properties of both CC and RHA. The deformability of the SCC was evaluated using the slump flow and J-ring tests. The T500 time and the V-funnel test were used to assess the viscosity of the SCC. The flowability retention was monitored by the plunger method, and flow resistance was determined based on the rheological measurements of SCC. The evolution of the hydrate phases of the binder in SCC was determined by thermogravimetric analysis, while the durability was evaluated by a rapid chloride migration test. Cement partial replacement with 20 vol-% CC has no significant effect on fresh SCC, flowability retention, compressive strength and durability properties. On the other hand, 20 vol-% RHA requires a higher dosage of SP to achieve self-compactability and increase the viscosity of SCC. Its flowability retention is only up to 30 min after mixing and exhibited higher flow resistance. It consumes more calcium hydroxide (CH) and improves the compressive strength and chloride resistance of SCC. The ternary blending with CC and RHA yielded better fresh SCC properties compared to the binary blend with RHA, while an improved chloride penetration resistance could be achieved compared to the binary CC blend.

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Section: Resultssupporting

confidence: 79%

Properties of Self-Compacting Concrete Produced with Optimized Volumes of Calcined Clay and Rice Husk Ash—Emphasis on Rheology, Flowability Retention and Durability

Muhammad

Thienel

2023

Materials

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“…This peak was more pronounced at 28 days and increased with Minerals 2022, 12, x FOR PEER REVIEW 15 of 21 higher replacement by CC. Another mass loss was observed between T = 450 °C and 550 °C due to the decomposition of Ca(OH)2 [64][65][66][67]. Cement replacement with CC led at both ages to a reduction in the quantity of portlandite in the system as depicted in Figure 12.…”

Section: Hardened Properties Of Self-consolidating Paste and Mortarmentioning

confidence: 93%

“…This reduction was due to the effect of cement replacement by the CC thereby reducing the rate of precipitation of the hydrate phases in the system. The first peak occurred between T = 50 • C and 140 • C and was mainly related to the dehydration of ettringite (E) and C-S-H [64][65][66][67]. The second mass loss between 140 • C and 190 • C was associated with the dehydration of carboaluminates, both AFm-Mc (short: Mc) and AFm-Hc (Hc), which were formed from the reaction of aluminate and carbonate ions in the PLC systems [64,65].…”

Section: Hardened Properties Of Self-consolidating Paste and Mortarmentioning

confidence: 99%

“…At 28 days of hydration, the pozzolanic reaction of the CC led to the further reduction (here: consumption) in portlandite in the system. Between T = 600 • C and 800 • C, the decomposition of calcium carbonate (CaCO 3 ) occurred due to the presence of unreacted calcite in the system stemming from LP [64][65][66][67]. The peak decreased with the increasing replacement level, as more carboaluminates were formed from LP and CC.…”

Section: Hardened Properties Of Self-consolidating Paste and Mortarmentioning

confidence: 99%

“…The first peak occurred between T = 50 °C and 140 °C and was mainly related to the dehydration of ettringite (E) and C-S-H [64][65][66][67]. The second mass loss between 140 °C and 190 °C was associated with the dehydration of carboaluminates, both AFm-Mc (short: Mc) and AFm-Hc (Hc), which were formed from the reaction of aluminate and carbonate ions in the PLC systems [64,65]. This peak was more pronounced at 28 days and increased with Minerals 2022, 12, x FOR PEER REVIEW 15 of 21 higher replacement by CC.…”

Section: Hardened Properties Of Self-consolidating Paste and Mortarmentioning

confidence: 99%

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Suitability of Clinker Replacement by a Calcined Common Clay in Self-Consolidating Mortar—Impact on Rheology and Early Age Properties

2022

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The use of a high amount of calcined clays as cement replacement presents a great challenge in designing self-consolidating concrete. This current attempt evaluates the influence of cement replacement with up to 40 vol.% by a calcined common clay (CC), dominated by 2:1 phyllosilicates in combination with a fixed limestone powder (LP) content on fresh and hardened properties of self-consolidating mortar (SC-M). The fresh properties of SC-M were investigated by mini-slump flow, V-funnel and rotational viscometer measurements. Setting and hardening behavior were observed via dynamic modulus of elasticity and plastic shrinkage. Hydration mechanisms were determined by isothermal calorimetry and thermal analysis. Hardened properties of SC-M were evaluated using compressive strength tests and mercury intrusion porosimetry (MIP). The results revealed a decreased rate of deformability in SC-M when cement is substituted increasingly by CC and a rising superplasticizer (SP) demand, but indicated an improved stability of SC-M even at a higher dosage of SP and hardly any impact on the setting behavior. CC enhanced the precipitation of monocarboaluminate phases and thereby refined the pore size distribution of the binder matrix. SC-M can be produced with up to 40 vol.% CC as cement replacement without having effect on its 28 days mechanical properties.

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Application of calorimetry and other thermal methods in the studies of granulated blast furnace slag from the old storage yards as supplementary cementitious material

Nocuń-Wczelik

Pacierpnik²,

Kapeluszna

2021

J Therm Anal Calorim

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The calorimetric and DTA/TG measurements were applied in testing the effect of granulated blast furnace slag originated from the storage yards of different age, added as a supplementary cementing material to the Portland cement clinker. The studies were performed with aim to evaluate the kinetics of cement hydration and the modification of hydrated paste composition in the presence of additive. The material after 20-year storage, the crushed slag after approximately 2-years storage and the new slag from the current production in the metallurgical plant were used. The slag percentage was 5 ÷ 50%. The addition of granulated blast furnace slag stored for a long time affects the standard properties of cement reducing the compressive strength at longer maturing and with the percentage of additive. This is related mainly to the reduction in the vitreous component. However, at the additive content up to 50% the binder complying with the requirements of the relevant European standards for common cements could be produced. Basing on the results of TG measurements the role of calcium carbonate, being the product resulting from the slag weathering process, acting as a grindability and setting/hardening modifying agent, was highlighted.

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Use of calorimetry and thermal analysis to assess the heat of supplementary cementitious materials during the hydration of composite cementitious binders

Cited by 17 publications

References 53 publications

Properties of Self-Compacting Concrete Produced with Optimized Volumes of Calcined Clay and Rice Husk Ash—Emphasis on Rheology, Flowability Retention and Durability

Properties of Self-Compacting Concrete Produced with Optimized Volumes of Calcined Clay and Rice Husk Ash—Emphasis on Rheology, Flowability Retention and Durability

Suitability of Clinker Replacement by a Calcined Common Clay in Self-Consolidating Mortar—Impact on Rheology and Early Age Properties

Application of calorimetry and other thermal methods in the studies of granulated blast furnace slag from the old storage yards as supplementary cementitious material

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