Application of Ground Granulate Blast Furnace Slag-Steel Slag Composite Binder in a Massive Concrete Structure under Severe Sulphate Attack

Abstract

A composite mineral binder was prepared by mixing ground granulate blast furnace slag (GGBS) and steel slag (GGBS/steel slag ratios are 1 : 1 or 3 : 2 by mass). The application of a composite binder in a massive concrete structure under severe sulphate attack is discussed by determining the hydration heat, adiabatic temperature increase, compressive strength, elastic modulus, chloride ion permeability, and sulphate attack resistance. The results show that the hydration heat of the composite binder decreases greatly when the cement replacement ratio increases to 50% at 45 ∘ C. The adiabatic temperature rise of the concrete containing the composite mineral admixture decreases significantly. Concrete containing the composite mineral admixture has a lower early elastic modulus and satisfactory late-age compressive strength. The composite mineral admixture can improve the resistance to chloride ion permeability and sulphate attack resistance of concrete, especially during temperature match curing.

Study on the Preparation and Fracture Behavior of Red Mud-Yellow Phosphorus Slag-Based Concrete

“…Yellow phosphorus slag (YPS) is a kind of industrial waste generated after water quenching, produced during the hot production process of yellow phosphorus; the output of yellow slag is 8-10 tons of slag per 1 ton of industrially produced yellow phosphorus [1]. e YPS utilization ratio in China is very low, with over 8 million tons of generated YPS waiting to be utilized every year [2,3]. Serious environmental issues caused by elemental P and F in YPS warrant further study to avoid resource waste and environmental pollution [4].…”

“…Studies indicate that concrete containing mineral admixtures exhibits a low reaction degree during the early ages and achieves a lower early strength than plain cement concrete [19,20]. New kinds of mineral admixtures are gradually being used in concrete production because the traditional mineral admixtures are becoming increasingly scarce [2]. Recently, in the cement industry, there has been an increasing interest in partially or completely replacing cement with industrial solid wastes, such as fly ash [21,22], yellow phosphorous slag [4,23], red mud [24,25], blast furnace slag [26,27], and phosphogypsum [28,29].…”

“…YPS is similar to but less reactive than blast furnace slag (BFS) and is mainly composed of CaO and SiO 2 [30,31]. Previous studies indicated that YPS can refine the late-age pore structure of hardened paste, reduce the chloride diffusion coefficient, enhance the compressive strength, and improve the durability of concrete [2,32]. In addition, the trace amount of fluoride and phosphorus in YPS can increase the activity of the clinker mineral during dissolution and can help improve the cement clinker strength [33].…”

Applications of Steel Slag Powder and Steel Slag Aggregate in Ultra‐High Performance Concrete

“…e application of steel slag powder as a mineral admixture in concrete has been investigated in many studies [12][13][14]. Steel slag powder has hydraulic properties, and its hydration process is similar to that of cement [15,16].…”

Evaluation of Strengths from Cement Hydration and Slag Reaction of Mortars Containing High Volume of Ground River Sand and GGBF Slag

“…Slag reaction required calcium hydroxide and an alkali from the hydration of PC to increase the reaction rate, resulting in a higher compressive strength at later ages [36]. Furthermore, at later ages, the GGBF slag produced a cementitious material that improved pore filling [37], created a denser microstructure, and enhanced the compressive strength obtained from the slag reaction when the GGBF slag replacement was increased.…”