Activated slag as partial replacement of cement mortars: Effect of temperature and a novel admixture

Korde, Chaaruchandra; Cruickshank, Matthew; West, Roger; Pellegrino, Claudia

doi:10.1016/j.conbuildmat.2019.04.172

Cited by 22 publications

(2 citation statements)

References 44 publications

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“…AAS is produced by activating slag additive with different types of activator (El-Wafa and Fukuzawa, 2018;Yang J. et al, 2019). Typical activators used for AAS are alkali hydroxide, silicate, carbonate or sulfate (Cihangir et al, 2015;Luukkonen et al, 2018;Korde et al, 2019). Recent research results show that compared with OPC-based CPB (OPC-CPB), AAS-based CPB (AAS-CPB) have excellent properties such as better-quality fluidity (Koohestani et al, 2021;Zaibo et al, 2021;Zhang et al, 2021), higher mechanical strength (Cihangir et al, 2018;Jiang et al, 2020;Cavusoglu et al, 2021), and better sulfate corrosion resistance (Cao et al, 2019b;Zhu et al, 2021b;Zheng et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Strength Analysis and Optimization of Alkali Activated Slag Backfills Through Response Surface Methodology

Dai

Ren

et al. 2022

Front. Mater.

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The significant difference in water-to-binder ratio, activator type and concentration between alkali-activated slag (AAS) paste/mortar/concrete and AAS-based cemented paste backfill (AAS-CPB) means that previous results related to the properties and mix optimization of AAS materials cannot be directly translated to AAS-CPB. This study statistically identifies the effect of key influential variables such as silicate modulus, slag fineness and activator concentration on 3- and 28 day unconfined compressive strength (UCS) of AAS-CPB by central composite design (CCD) established in response surface methodology (RSM). In this study, the prominence of independent variables and their relations are investigated by using ANOVA (analysis of variance) having a significant level of 0.05. ANOVA results certify that there is a strong link between the level of variable contribution on UCS performance of AAS-CPB and curing age. Obviously, silicate modulus and activator concentration are the most major variables influencing UCS at 3 and 28 days, respectively. Increased fineness of slag and higher pH of pore solution enhance 3 day UCS, but restrain the further hydration of unreacted slag and subsequent the gain in strength at advanced curing ages. The combination of independent variables of silicate modulus (0.295), slag fineness (12630.2), activator concentration (0.45) gives the optimum responses.

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Section: Introductionmentioning

confidence: 99%

Strength Analysis and Optimization of Alkali Activated Slag Backfills Through Response Surface Methodology

Dai

Ren

et al. 2022

Front. Mater.

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“…Ground granulated blast furnace slag (GGBFS) is widely used in various engineering applications to replace the ordinary Portland cement (OPC) [1][2][3]. However, GGBFS is sensitive to curing conditions and exhibit slow strength development [4][5][6][7][8]. In order to predict the strength behavior in the concrete with GGBFS, much research have been performed based on cement hydration phenomena [9].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Strength Development in Concrete with Ground Granulated Blast Furnace Slag Using Apparent Activation Energy

et al. 2020

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Ground granulated blast furnace slag (GGBFS) conventionally has been incorporated with ordinary Portland cement (OPC) owing to reduce the environmental load and enhance the engineering performance. Concrete with GGBFS shows different strength development of normal concrete, but sensitive, to exterior condition. Thus, a precise strength evaluation technique based on a quantitative model like full maturity model is required. Many studies have been performed on strength development of the concrete using equivalent age which is based on the apparent activation energy. In this process, it considers the effect of time and temperature simultaneously. However, the previous models on the apparent activation energy of concrete with mineral admixtures have limitation, and they have not considered the effect of temperature on strength development. In this paper, the apparent activation energy with GGBFS replacement ratio was calculated through several experiments and used to predict the compressive strength of GGBFS concrete. Concrete and mortar specimens with 0.6 water/binder ratio, and 0 to 60% GGBFS replacement were prepared. The apparent activation energy (Ea) was experimentally derived considering three different curing temperatures. Thermodynamic reactivity of GGBFS mixed concrete at different curing temperature was applied to evaluate the compressive strength model, and the experimental results were in good agreement with the model. The results show that when GGBFS replacement ratio was increased, there was a delay in compressive strength.

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Mechanical and micro‐characterization of alkali‐activated concrete under high‐temperature exposure

Pratap,

Paswan,

Kumar

2024

Structural Concrete

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In the event of a fire, the performance of concrete becomes pivotal for structural integrity. Concrete undergoes significant changes in its mechanical properties when exposed to high temperatures. This study investigates the mechanical and micro‐characterization of concrete incorporating ground granulated blast furnace slag (GGBFS) under ambient and exposed conditions. The study examines alkali‐activated concrete (AAC) by implementing sodium hydroxide (NaOH) and sodium silicate (Na2SiO3) as alkali activators. Three different fractions of GGBFS and alkali activators (AAs) were employed in the concrete mixes. The mechanical properties of the AAC were evaluated under ambient and elevated temperatures, and the results were compared with those of Portland slag cement (PSC). The study's findings indicate that AAC outperforms PSC, and the study recommends using 93% GGBFS with 7% AAs as a suitable replacement for PSC. The mechanical properties of AAC are enhanced by 20%–47% at ambient conditions. The strength loss for the AAC with increased temperature is also less than that of the PSC concrete.

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Activated slag as partial replacement of cement mortars: Effect of temperature and a novel admixture

Cited by 22 publications

References 44 publications

Strength Analysis and Optimization of Alkali Activated Slag Backfills Through Response Surface Methodology

Strength Analysis and Optimization of Alkali Activated Slag Backfills Through Response Surface Methodology

Evaluation of Strength Development in Concrete with Ground Granulated Blast Furnace Slag Using Apparent Activation Energy

Mechanical and micro‐characterization of alkali‐activated concrete under high‐temperature exposure

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