Abstract
The use of blast furnace slag‐based binders in cemented paste backfill (CPB) has become increasingly popular in China, due to its low cost and superior early‐age strength. Increasing the solid content can increase the strength of CPB, but it will lead to a decrease in its fluidity. As a chemical admixture that can improve CPB slurry fluidity, superplasticizer is gaining increased interest in the field of CPB. In this study, the effects of superplasticizer types and dosages, curing time, solid content, and binder content on the rheological properties of fresh CPB made of blast furnace slag‐based binder (Slag‐CPB) were studied. For Slag‐CPB samples, polycarboxylate (PC) has the best water‐reducing effect, followed by polymelamine sulfonate (PMS) and polynaphthalene sulfonate (PNS). In the absence of a superplasticizer, the shear yield stress and plastic viscosity of Slag‐CPB are lower than those of CPB made of ordinary Portland cement (OPC‐CPB). The water‐reducing effect of PC on OPC‐CPBs samples is stronger than that of Slag‐CPB samples. The degradation rate of the water‐reducing effect in slag‐based samples is higher than that in cement‐based samples. The effect of PC is affected by solid content and binder content. These results will contribute to a better understanding of the rheological behavior of Slag‐CPB with superplasticizer.
Highlights
Mining activities obtain mineral resources, and produce a lot of solid wastes and underground voids [1,2,3,4,5]. e continuous improvement of national environmental protection requirements has prompted mining enterprises to seek scientific and efficient methods for underground voids and tailings management [6]
This study aims to evaluate the rheological properties of Slag-cemented paste backfill (CPB) containing superplasticizer, with a special emphasis on quantifying the effect of superplasticizer type and dosage, curing time, solid content, and binder content on rheological parameters, principally yield stress, and plastic viscosity
(3) e shear yield stress and plastic viscosity of the Slag-CPB without the addition of PC increase rapidly with the solid content. e degree of improvement of PC to the shear yield stress of slurry with different solid contents depends on PC dosage
Summary
Mining activities obtain mineral resources, and produce a lot of solid wastes (e.g., tailings) and underground voids [1,2,3,4,5]. e continuous improvement of national environmental protection requirements has prompted mining enterprises to seek scientific and efficient methods for underground voids and tailings management [6]. E continuous improvement of national environmental protection requirements has prompted mining enterprises to seek scientific and efficient methods for underground voids and tailings management [6] One of these emerging techniques is cemented paste backfill (CPB) which offers better technical and economic advantages over other filling methods like rock/slurry fills. E cemented paste backfill (CPB) is a composite material prepared by mixing a certain mass ratio of tailing, binders (e.g., cement, fly ash, or slag), and water [7,8,9,10,11,12] It offers a range of advantages including efficient disposal of processing tailings, improved working environment, increased resource recovery, and improved ground controls [13,14,15,16,17,18]. When the slurry concentration exceeds a certain critical value, the shear yield stress and dynamic viscosity can increase exponentially with the concentration, which will lead to pipe clogging, which can have significant financial ramifications [20]
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