Abstract
Creep and shrinkage of Cement and Concrete Composites (CCC) are significant properties that need to be considered to use these materials in practice. Many previous scientific studies revealed CCC creep characteristics under sustained compression and shrinkage, using traditional test methods from design standards. Because of the complexity of experimental procedures, CCC creep in tension has not been studied as close. Furthermore, there is no unified standard that proposes applicable testing methods or specific testing apparatus. This study examines the suitability of 2D—Digital Image Correlation (DIC) to observe the creep deformations of specimens under tension. Ordinary Portland cement (OPC) mortar with 1% polyvinyl alcohol (PVA) fibres has been investigated in the research. Compact tension (CT) specimens 150 × 150 × 12 mm (with a notch) were used. Creep deformations under sustained uniaxial tension (applied loading corresponding to 60% of the ultimate strength) were measured. DIC images were captured using an entry/mid-level DSLR camera. Results show that DIC is suitable for studying uniaxial tensile creep of cement and concrete composites. Deformation of specimens in tension was similar to that measured using the conventional method (using surface-attached gauges).
Highlights
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The term concrete composite is associated with any concrete mix that can be viewed as ageing viscoelastic materials [8,9,10]
To predict the maximum stress intensity zone and limit the field of view (FOV) area, the 80 mm long aration of Compact Tension (CT) specimens was done after 7 days of curing
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Viscoelastic behaviour (creep and relaxation) of CCC is considered when evaluating material suitability for practical use, as are the restrained and unrestrained shrinkage properties Estimation of such effects must be integrated into the design process [11,12,13]. Digital image correlation (DIC) is a non-contact, optically based research technique that allows the monitoring of various derived quantities-of-interest (QOIs) at the surface of a test specimen. Through this method, point displacements, strains, surface curvature and velocities can be tracked. 2D-DIC was employed to monitor fibre-reinforced Portland cement composite tensile creep deformation. Such long-term DIC experiments have not been previously done
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