Using calcium‐rich precursors to improve the early‐compressive strength of alkali‐activated slag cement at low temperature

Yang, Kai; Yang, Yong; Deng, Jiaxin; Xiong, Deyi; Zhu, Xiaohong; Li, Qing; Chen, Yang; Basheer, Pam

doi:10.1002/suco.202100021

Cited by 4 publications

(1 citation statement)

References 43 publications

(111 reference statements)

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“…The setting time is also one of the important workability properties of concrete mixes, which determines the time window for mixing, transporting and placing the mixes. One of the disadvantages of applying GGBFS as a precursor in alkali activated cementitious materials is its rapid setting time [32][33][34][35], especially when mixed with more activator to obtain higher mechanical properties [36], its setting is extremely rapid, making it extremely limited in practical engineering applications [37]. You N et al [38] found that the amount of steel slag at 50% can significantly delay the setting time of alkali activated mortar and improve the flowability.…”

Section: Introductionmentioning

confidence: 99%

Effect of Steel Slag Powder Content and Curing Condition on the Performance of Alkali Activated Materials Based Ultra-High Performance Concrete (UHPC) Matrix

Shi¹,

Deng²,

Hu³

et al. 2023

Preprint

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The accumulation of steel slag and other industrial solid wastes has caused serious environmental pollution and resource waste. The resource utilization of steel slag is imminent. In this paper, alkali activated materials ultra-high performance concrete (AAM-UHPC) was prepared by replacing GGBFS powder with different proportions of steel slag powder, and its workability, mechanical properties, curing condition, microstructure, and pore structure were investigated. The results illustrate that the incorporation of steel slag powder can significantly delay the setting time and improve the flowability of AAM-UHPC, making it possible for engineering applications. The mechanical properties of AAM-UHPC showed a tendency to increase and then decrease with the increase of steel slag dosing, and reached the best performance at 30% dosage of steel slag. The maximum compressive strength and flexural strength are 157.1 MPa and 16.32 MPa, respectively. High temperature steam or hot water curing at early age was beneficial to the strength development of AAM-UHPC, but continuous high temperature hot and humid curing would lead to strength inversion. When the dosage of steel slag is 30%, the average pore diameter of the matrix is only 8.43nm, and the appropriate steel slag dosage can reduce the heat of hydration and refine the pore size distribution, making the matrix more dense.

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Section: Introductionmentioning

confidence: 99%

Effect of Steel Slag Powder Content and Curing Condition on the Performance of Alkali Activated Materials Based Ultra-High Performance Concrete (UHPC) Matrix

Shi¹,

Deng²,

Hu³

et al. 2023

Preprint

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A green binder for cold weather applications: enhancing mechanical performance of alkali-activated slag through modulus, alkali dosage, and Portland cement substitution

Dener,

Altunhan,

Benli

2024

Arch. Civ. Mech. Eng.

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Below 5 °C, Portland cement (PC) experiences delayed hydration, slowing strength development, making it unsuitable for winter. Alkali-activated slag (AAS) emerges as a viable alternative with continuous hydration in low-temperature conditions. The effect of the activator nature on the performance of AAS cured at normal temperatures is well known, but further studies are required for low-temperature conditions. This study investigates the synergistic impact of activator modulus (1.2 and 1.5), alkali dosage (5, 7, and 9%), and PC substitution rates (0, 10, and 20%), on low-temperature cured AAS properties. Eighteen mixtures were prepared and cured at 2 °C. Compression and ultrasonic pulse velocity tests were conducted after 7, 28, and 90 days. Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy analyses were performed to examine the microstructure of the samples. Elevating alkali dosage enhanced early age strength but resulted in a drop in 90-day strength. Simultaneous increases in modulus and PC substitution rate reduced strength due to shrinkage-induced crack formation. Optimal mixture design options included using 10% PC in the 1.2 modulus and omitting PC when the 1.5 modulus was selected. Despite low temperatures, the use of PC significantly accelerated the setting time. Altering modulus and alkali dosage caused a considerable change in the intensity of the peaks in the FTIR spectrum. The findings indicate that AAS shows promise when adjusting the mixture design for temperatures below 5 °C, which are unfavorable for the hydration of PC.

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Effects of various additives on the crumb rubber integrated geopolymer concrete

et al. 2023

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Using calcium‐rich precursors to improve the early‐compressive strength of alkali‐activated slag cement at low temperature

Cited by 4 publications

References 43 publications

Effect of Steel Slag Powder Content and Curing Condition on the Performance of Alkali Activated Materials Based Ultra-High Performance Concrete (UHPC) Matrix

Effect of Steel Slag Powder Content and Curing Condition on the Performance of Alkali Activated Materials Based Ultra-High Performance Concrete (UHPC) Matrix

A green binder for cold weather applications: enhancing mechanical performance of alkali-activated slag through modulus, alkali dosage, and Portland cement substitution

Effects of various additives on the crumb rubber integrated geopolymer concrete

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