Abstract
This research include the study of flexural behavior of reinforced concrete beams with and without addition of super absorbent polymer (SAP) to concrete, two groups of concrete mixture were used; each one have five concrete mixture (Reactive Powder Concrete RPC, Modified Reactive Powder Concrete, Self Compact Concrete SCC, High Strength Concrete HSC and Normal Strength Concrete NSC) four of them with high compressive strength and the last one with normal compressive strength. Group A casting concrete without addition of SAP, group B casting concrete with addition of SAP. Ten beams are molded of (200*300*1700) mm dimension with same steel reinforcement. Flexural tested for all beams was doing and load-deflection relationships of beams with and without SAP were established. Test results had shown that beams casting with addition of SAP (group B) proved to have larger load carrying capacity and llower deflection compared with group A.
Highlights
High strength concrete HSC with a low watercement ratio has become widely used in the last decades, it needs particular curing to complete hydration process so addition of super absorbent polymer (SAP) as internal curing and its effect on flexural behavior of high strength reinforced concrete beams studied in this research
Deflection is the degree to which a structural element is displaced under a load, to improve this behavior, it is necessary to use internal curing to concrete to ensure the complete of cementation material hydration and reduuce of self-desilcation, the phenomena that occurs in high strength mixes of concrete due to insufficient internal curing, in this study SAP is used as internal curing material
The purpose of this study is to experimentally evaluate the effect of SAP as internal curing agent in order to increase the applied load and decrease the deflection of beams by complete the hydration of cement material, after SAP particle absorb the external water during mixing of concrete, the water released from SAP to continue the hydration of cement, i.e producing more gel particles and more development in strength
Summary
High strength concrete HSC with a low watercement ratio has become widely used in the last decades, it needs particular curing to complete hydration process so addition of super absorbent polymer (SAP) as internal curing and its effect on flexural behavior of high strength reinforced concrete beams studied in this research. The purpose of this study is to experimentally evaluate the effect of SAP as internal curing agent in order to increase the applied load and decrease the deflection of beams by complete the hydration of cement material, after SAP particle absorb the external water during mixing of concrete, the water released from SAP to continue the hydration of cement, i.e producing more gel particles and more development in strength. Relative thick rubber strips were inserted between the concrete and line loads to provide even surface, as well as between support of machine and lower support face of beams, two months the age of testing
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