Influence of fired clay brick waste additions on the durability of mortars. (September 2015)

• Record Type: Journal Article
• Authors: Schackow, A.; Stringari, D.; Senff, L.; Correia, S.L.; Segadães, A.M.
• Is Part Of: Cement & concrete composites. Volume 62(2015)
• Page Start: 82
• Page End: 89
• Publication Date: 2015-09
• Subjects: Clay brick waste -- Metakaolin -- Durability -- Mortar -- Sulphate resistance -- Carbonation; Composite-reinforced concrete -- Periodicals; Concrete -- Periodicals; Composite materials -- Periodicals; Composites de ciment -- Périodiques; Béton -- Périodiques; Composites -- Périodiques; Béton léger -- Périodiques; Cement composites; Composite materials; Composite-reinforced concrete; Concrete; Lightweight concrete; Periodicals; Electronic journals; 620.135
• DOI: 10.1016/j.cemconcomp.2015.04.019
• Languages: English
• ISSNs: 0958-9465

Abstract

Abstract: The use of metakaolin is known to help improve properties of Portland cement-based mortars. The presumed similarities between the characteristics of metakaolin and those of a powdered (<45 μm) fired clay brick clean waste (CBW) led to the investigation of the effect on the durability of mortars of partial replacement (10, 25 and 40 wt.%) of Portland cement by CBW. Properties such as 28 and 90 days-compressive strength, water absorption, apparent porosity, absorption by capillarity, chloride retention, carbonation depth and sulphate resistance were evaluated. The CBW-containing cured mortars showed improved strength and density, as the result of combined physical and pozzolanic pore filling effect of added CBW. However, CBW-free mortar exhibited larger spreading and, being more porous, higher sulphate resistance and ability to absorb chlorides. Optimum performance was found for the 40 wt.% CBW mortar whose compressive strength can be up to 130% higher than that of the CBW-free mortar.