Review and Experimental Investigation of Retarder for Alkali-Activated Cement

Holschemacher, Klaus; Tekle, Biruk Hailu

doi:10.1007/978-3-031-21735-7_67

Cited by 2 publications

(1 citation statement)

References 29 publications

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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 [ 33 , 34 , 35 , 36 ], especially when mixed with more activator to obtain higher mechanical properties [ 37 ], its setting is extremely rapid, making it extremely limited in practical engineering applications [ 38 ]. You N et al [ 39 ] 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%

Effects of Steel Slag Powder Content and Curing Condition on the Performance of Alkali-Activated Materials Based UHPC Matrix

Shi

Deng

et al. 2023

Materials

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The accumulation of steel slag and other industrial solid wastes has caused serious environmental pollution and resource waste, and the resource utilization of steel slag is imminent. In this paper, alkali-activated ultra-high-performance concrete (AAM-UHPC) was prepared by replacing ground granulated blast furnace slag (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 in steel slag dosing and reached their best performance at a 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 an 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 8.43 nm, and the appropriate steel slag dosage can reduce the heat of hydration and refine the pore size distribution, making the matrix denser.

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