Fresh and Hardened Properties of Cementitious Composites Incorporating Firebrick Powder from Construction and Demolition Waste

Abstract

Firebricks are generally used in furnace basins where glass, ceramics, and cement are produced. Firebricks have an important place in construction and demolition waste (CDW). However, there is a limited understanding of the effects on fresh and hardened state properties of cementitious composites. This study investigates the mechanical, physical, and microstructural properties of cementitious composites incorporating firebrick powder (FBP) from CDW. In this regard, the FBP was used at 5, 10, 15, 20, and 25% replacement ratio by weight of cement to produce cementitious composites. The consistency, setting characteristics, and 3, 7, and 28 days compressive and flexural strength tests of produced cementitious composites were performed. In addition, ultrasonic pulse velocity, water absorption, porosity, unit weight, and microstructure analysis of cementitious composites were conducted. As a result, the 28-day compressive strength of the cementitious composite mortars containing up to 10% firebrick powder remained above 42.5 MPa. The flow diameters increased significantly with the increase of the FBP. Therefore, it has been determined that the FBP can be used up to 10% in cementitious composites that require load-bearing properties. However, FBP might be used up to 25% in some cases. Using waste FBP instead of cement would reduce the amount of cement used and lower the cost of producing cementitious composites.

Replacement of Fine Aggregate with Refractory Brick Residue in Concrete Exposed to Elevated Temperatures

“…These results are similar to Baradaran and Nematzadeh (2017), workability was affected reporting similar significant reductions with slump ranging from 85, 70, 65, 60 and 55 mm as a function of replacing 0, 25, 50, 75 and 100 % refractory material in the concrete mix, respectively. Refractory brick dust is relevant when it is less than that of cement to attribute better workability in concrete (Sevim et al (2023). Consequently, a level of flowability will be achieved by using superplasticizer (Shirani et al, 2021).…”

“…According to studies by Baradaran and Nematzadeh (2017), it was concluded that workability is affected with doses of 25, 50, 75 and 100 % of refractory material, with slump ranging from 70 mm to 55 mm. On the other hand, the specific surface area of materials such as refractory brick powder is relevant when it is lower than that of cement to attribute a better workability in concrete as expressed by Sevim et al (2023). Consequently, a level of flowability is achieved using superplasticizer (Shirani et al, 2021).…”

Utilization of Aluminosilicate Industrial Wastes as Precursors in CO2-Cured Alkali-Activated Precast Concrete Pavement Blocks

“…Research efforts have concentrated on diminishing the environmental footprint of OPC by incorporating supplementary cementitious materials (SCMs) like fly ash (FA) and blast furnace slag (BFS). These materials have gained widespread adoption as partial substitutes for OPC, as demonstrated in various studies [9][10][11][12][13][14][15][16][17]. Furthermore, extensive research has been conducted on the utilization of BFS and FA as exclusive or combined constituents in alkali-activated concrete formulations, reporting interesting findings documented in the literature [18][19][20][21][22][23][24][25][26][27][28][29][30].…”

Statistical Reliability Analysis of Ultrasonic Velocity Method for Predicting Residual Strength of High-Strength Concrete under High-Temperature Conditions

“…Table 1 provides a glimpse of previously proposed concrete strength prediction models utilizing UPV. These models can be broadly categorized into ‘early age’, ‘middle age’, and ‘high temperature’ [ 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 ]. Studies for predicting concrete strength using UPV, which were previously performed, can be divided into three main purposes.…”