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Abstract
This paper conducted research on fracture and impact properties of short discrete jute fibre reinforced cementitious composites (JFRCC) with various matrix for developing low-cost natural fibre reinforced concretes and mortars for construction. Fracture properties of JFRCC were tested on notched concrete beams at 7, 14 and 28days and the results were interpreted by the two-parameter fracture model (TPFM). Impact resistance of JFRCC were examined on mortar panels with the dimensions of 200×200×20mm3 at 7, 14 and 28days through repeated dropping weight test. Qualitative and quantitative analyses were conducted for crack pattern, impact resistance and energy absorbed by JFRCC mortar panels based on eye observations and measurement from an oscilloscope. In addition, compressive, flexural and splitting tensile strengths of JFRCCs were tested at 7, 14 and 28days conforming to relevant EN standards. It was found that, by combining GGBS with PC as matrix, JFRCC achieved higher compressive strength, tensile strength, fracture toughness, critical strain energy release rate, and critical stress intensity factor than those with combination of PFA and PC as matrix. Impact tests, however, indicated that JFRCC mortar panels with PFA/PC matrix possessed higher impact resistance, absorbed more impact energy and survived more impact blows upon failure than those with GGBS/PC matrix at the ages of 14 and 28days. JFRCC mortar panels did not shatter into pieces and demonstrated a ductile failure while the plain mortar ones behaved very brittle and shattered into pieces. Upon impact failure, fibre pull-out was observed in JFRCC mortar panels with PFA/PC matrix while fibre fracture in those with GGBS/PC matrix. Besides, the impact resistance, in terms of the number of impact blows survived and the total energy absorbed upon failure, of JFRCC mortar panels decreased with age.
Highlights
Nowadays one of the main challenges of construction industry is to improve their image in terms of sustainability
The compressive and splitting tensile strengths of various jute fibre reinforced cementitious composites (JFRCC) concretes at 7, 14 and 28 days are shown in Figs. 5 and 6, respectively
Fibre reinforcement did increase the splitting tensile strength of concrete with it rising to 1/6 of the corresponding compression value for pulverised fly ash (PFA) concrete comparing with the value of 1/10 usually quoted as the ratio between the tensile and the compression strength for plain concrete
Summary
Nowadays one of the main challenges of construction industry is to improve their image in terms of sustainability. High alumina cement, gypsum, and a variety of special low carbon and low energy supplementary cementitious materials have been used to produce FRCCs, which may improve the durability of the composites, and/or. It is generally believed that the inclusion of natural fibres improves the fracture toughness and impact resistance of cementitious materials. The soaked fibres were treated either (1) with boiling water and washed with tap water; or (2) with chemicals, in that case, first in 0.25% Sodium Alginate (NaC6H7O6) solution for 30 min followed by in 1% Calcium Chloride (CaCl2) solution for 90 min They found that fibre tensile strength, fibre toughness and fibre-concrete bond strength can be increased by 34%, 55% and 184%, respectively, when fibres are boiled and washed. The fibres embedded in cement concrete showed only marginal loss of strength [18]
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