Abstract
For all types of concrete structures, controlling of cracking, as well as the enhancement of serviceability and ultimate flexural capacity are important issues for deck slabs. This study presents an experimental campaign and accompanying nonlinear analysis of a series of Strain Hardening Cementitious Composite (SHCC) and reinforced concrete slab systems, simply-supported and subjected to four-point loading. In order to improve flexural performance both at the service and ultimate limit states, an SHCC layer with thickness of 150–400mm was placed on the soffit of the composite slab; the SHCC was manufactured using two different processes, namely cast-in-situ SHCCs and extruded precast SHCC panel. Nonlinear analysis of SHCC and reinforced concrete slabs was also carried out to predict moment and curvature as well as deflections of the slab systems. The developed slab systems were found to have enhanced performance with regard to both at serviceability and flexural capacity, compared to the conventional reinforced concrete slab.
Highlights
Strain Hardening Cementitious Composite (SHCC) or Engineered Cementitious Composite (ECC) is a type of composite material consisting mainly from cementitious binders and short polymeric fibres, such as polyvinyl alcohol (PVA) fibres, as shown in Fig. 1 [1,2,3]
The tensile stress-strain behaviour of SHCC is shown in Fig. 2; after initial cracks formed, the tensile stress of the SHCC was sustained until a tensile strain up to 2.0 % was reached [1,2,3,4, 6,7]
This study reports on experiments and nonlinear analysis carried out to evaluate a series of reinforced concrete composite slabs wherein cast-in-situ SHCCs or extruded precast SHCC
Summary
Strain Hardening Cementitious Composite (SHCC) or Engineered Cementitious Composite (ECC) is a type of composite material consisting mainly from cementitious binders and short polymeric fibres, such as polyvinyl alcohol (PVA) fibres, as shown in Fig. 1 [1,2,3]. The tensile stress-strain behaviour of SHCC is shown in Fig. 2; after initial cracks formed, the tensile stress of the SHCC was sustained until a tensile strain up to 2.0 % was reached [1,2,3,4, 6,7]. This is the reason why SHCC exhibits a highly ductile flexural behaviour (shown in Fig. 3) as opposed to plain concrete which is a brittle material in bending [1,2,3,4]. SHCC is expected to improve the structural performance of concrete members by controlling cracking and deformation, allowing longer spans, reducing the amount of required steel bars, and enhancing both the ductility and durability of reinforced concrete members [8,9,10,11,12]
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