Diyala Journal of Engineering Sciences (Jun 2024)
Structural Behavior of Reinforced Reactive Powder Concrete One-Way Slab
Abstract
Reactive powder concrete (RPC) is a new kind of concrete technique that has been enhanced and improved in recent decades which showing superior performance on structural systems. This paper shows experimental research to study the structural performance of reactive powder reinforced concrete one-way slabs in static loading by applying two symmetric loads and simply support type. In the present investigation, five RPC one-way slabs designed, casted and tested. All the slabs were similar in the length and the width (980x400mm), also in the properties of materials and their proportions, but different in thickness and the ratios of main reinforcement. They were cast into two groups; the first group had three values of longitudinal reinforcement proportions (ρw): 0.0036, 0.0048, and 0.0060, respectively, and the second group included three values of slab thickness: 40 mm, 60 mm, and 80 mm, respectively. Experimentally, it has been noticed that the ductility and flexural behaviour of RPC one-way slabs are considerably affected by increasing slab thickness but influence of longitudinal reinforcement less significant. The results of specimen testing indicated that increasing main steel reinforcement proportion from 0.0036 to 0.0048 and to 0.0060 led to an increase in the first cracking load test with a value of (19.05%, 42.86%), respectively, an increase in the ultimate load test with a value of (21%, 40.91%) respectively, and the value of ultimate mid-span deflection increased from 17.78% to 28.98%. The test results also revealed that the increase in thickness of slabs from 40mm to 60mm and then to 80mm led to an increase in the first cracking load test with a value of (166%, 240%), respectively, increase the ultimate load by (104.06%, 234.71%), respectively, and the value of ultimate mid-span deflection decreased from 36.82% to 58.26.
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