Abstract
The purpose of this research was to assess the effectiveness of two methods of reinforcing glass yarns, stitching and laminating methods, in a woven (1/1) polyethylene (PE) geotextile fabric used for fabric formwork. Both reinforcement methods improved the tensile properties when the holding load is within the combined breaking load of reinforced glass yarns. However, reinforcing by stitching method provided better tensile properties than the laminating method in respect to creep. The stitched specimens (S-1000 N) and (S-500 N) generated 7.04 mm and 0.53 mm creep respectively compared to the laminated specimens that has produced 7.56 mm (L-1000 N) and 3.11 mm (L- 500 N). A Hirsch’s model (combined effect of parallel model and series model) was used to predict the modulus of PE + glass yarn composite fabric for stitching method based on the 500 N holding load data. This modulus can be used to calculate the number of glass yarns that should be used in composite for a specific dimension of fabric formwork
Highlights
Fabric formwork is a technology that uses textile fabrics to make molds for concrete casting
Under statistical analysis (p ≤ 0.05), the differences between groups were significant. These results suggest that reinforcement by stitching (Group S-1000 and S-500) and by lamination (Group L-1000 and L-500) increased the modulus of the specimens
It was observed that the laminated samples produced the stiffer composite due to the straight configuration of glass yarns in the composite fabric
Summary
Fabric formwork is a technology that uses textile fabrics to make molds for concrete casting. PE is a thermoplastic material that is inherently ductile which causes creep deformation overtime [11]. This creep tendency creates problems in concrete casting. For fabric formwork, low cost fabric such as PE, polypropylene (PP) and polyester are preferred due to large quantity required in applications. Creep deformation is common in these fabrics and the highest for PE compared to PP and polyester and has been reported as a frequent problem in using a PE fabric for formwork as well as in geotextile applications [14,15,16,17]
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