Abstract
In this paper, dynamic behaviour of fiber reinforced mortars manufactured with innovative binders based on calcium sulphoaluminate cement (CSA), supplementary cementitious materials (SCMs), gypsum (G) and hydrated lime (CH) was investigated. Fly ash (FA) and ground granulated blast furnace slag (GGBFS) were used to develop sustainable Portland-free cementitious materials. Polypropylene structural fibers (1% by mortar volume) were used to reinforce the cementitious matrix. Fresh properties of mortars were evaluated in terms of workability and specific mass. In addition, elastic modulus, compressive and flexural strength were determined up 28 days from casting. The dynamic behaviour was studied by means of Split Hopkinson Tensile bar having 60 mm in diameter. Preliminary dynamic results reported in terms of stress versus crack opening displacement were evaluated and discussed.
Highlights
The reduction of environmental impact of reinforced concrete structures is one of the main topic in the construction sector [1, 2]
According to Coppola et al [8], the total substitution of Portland cement with ground granulated blast furnace slag (GGBFS) or Fly ash (FA) causes a decrease in compressive and flexural strength up to 35% at the same ages
28-day compressive strength of mortars containing CSA/OPC/G reaches 78 MPa while sustainable mixture manufactured with supplementary cementitious materials (SCMs) (FA or GGBFS) in place of OPC achieve 50 MPa
Summary
The reduction of environmental impact of reinforced concrete structures is one of the main topic in the construction sector [1, 2]. CSA cement is used in ternary mixtures with OPC and gypsum (G) with OPC/CSA ratios up to 2 [7] This leads to a slight reduction in CO2 emissions and energy production, generally close to 15-20% compared to OPC/CSA/G mortars at the same strength class. The total replacement in the ternary binder of OPC with supplementary cementitious materials (SCM) and hydrated lime (CH) determines a strong reduction of environmental impact, up to 60%, of CSA/SCM/CH/G mixtures. Previous studies [8] have shown the excellent mechanical properties and the low shrinkage of mortars manufactured with cement-free CSA-based binders. For these reasons, these mortars are suitable for the restoration and conservation of existing reinforced concrete structures. The aim of the article is to evaluate the effect of the addition of polypropylene structural fibers on the rheological, mechanical and dynamic properties of both CSA/OPC/G and CSA/SCM/CH/G mortars manufactured respectively with and without Portland cement
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