ABSTRACT
The main aim of the research is to study the mechanical properties of concrete and heir effects in concrete stability and failure.
He fractures mechanical properties in particular uniaxial tensile strength Ft, young’s modules Eo and fractures energy Gf as sell as the shape of the stress strain and the stress- deformation relation were investigated for high strength and normal strength concrete. In order to analyzed failure mechanism of the entire fracture cement pasture and cement paste aggregative inferface) were calculated on the basis of the optical measurement an meso and micro level, respectively. These data showed a clear correlation with fracture properties of the concretes investigated.
The researcher that the mechanical properties of concrete is dependent on the quality of the individual ingredients size, shape, texture and grading of aggregate affect the mechanical properties of concrete. Rough textured and irregular shape- aggregated produced concrete with good mechanical properties. The use of moist aggregates enhance internal curing which promotes the hydration of cement and there by, enhancing the properties of the concrete.
Table of contents
Title page
Certification
Dedication
Acknowledgement
Abstract
Table of contents
Notation
List of tables
Chapter one
1.1 introduction
1.2 aim of research
1.3 1.3 scope and limitation
Chapter two
Literature review
2.1 history of concrete
2.2 properties of concrete
2.2.1 strength
2.2.2 prodcuiton of concrete
2.2.3 types of concrete
Chapter three
Mechanical behavior of concrete
3.1 factors affecting mechanical properties of concrete
3.1.1 elasticity
3.1.2 temperature effects
3.1.3 shrinkage in concrete
3.1.5 types of shrinkage in concrete
3.17 creep
3.18 curing (external curing and internal curing of interface)
3.1.9 aggregates factors.
3.2.0 water content
3.2.1 Fracture mechanisms
3.2.2 Fracture mechanical experiments
3.2.3 Quantification of the condition of the fractures surface.
3.2.4 Discussion of the experimental results
CHAPTER FOUR
TESTING OF HARDENED CONCRETE
4.1 testing for compressive strength
4.2 factors affecting the measured compressive strength
4.3 tensile strength
4.4 bond between concrete and reinforcements
4.5 mondulus of flasticity
4.6 triaxial strength
4.7 accelerated test
4.8 assessment of concrete quality
4.9 non destructive quality test.
Chapter five
Conclusion
5.1 summary
5.2 recommendations
reference
NOTATIONS
Ft= tensile stress
E0= modules of elasticity
Etu= strain
Ftn= net tensile strength
Cf= fracture energy.
Ich= characteristic length
RS= roughness
CP= cement paste.
HSC= High strength concrete
NSH = Normal strength concrete
D gs = factual dimensions