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EFFECT OF CRUSHED CONCRETE AS COARSE AGGREGATES IN PRODUCTION OF CONCRETE
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ABSRACT - [ Total Page(s): 1 ]ABSTRACTIn the face of a possible scarcity of natural aggregates in the future in line with sustainable construction, this research investigates the feasibility of the use of recycled coarse aggregates as an alternative to natural coarse aggregates in structural concrete. The recycled coarse aggregate used in the research was processed from waste concrete. The percentage of recycled coarse aggregates by weight of all in aggregates in the test mixes were 0%, 5% 10% 20% and 30 % respectively. The properties of both natural and recycled coarse aggregates and the fresh and hardened properties of
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LIST OF TABLES - [ Total Page(s): 1 ]LIST OF TABLESTable 3.1: Proposed Mixes Proportions by weight Table 4.1a: Aggregate Impact and Crushing Value Test Table 4.1b: Aggregate Impact and Crushing Value Test Table 4.2b: Below shows the particle size distribution of fine aggregate used. Table 4.2c: Below shows the particle size distribution of coarse aggregate used Table 4:3 Compressive Strength for Natural Aggregate Table 4.4: Compressive Strength for Recycled Aggregate at 5% replacement Table 4.5: Compressive Strength for Recycled Aggregate at 10% replacement Table 4.6: Compressive Strength for Recycled Aggregate at 20% rep ... Continue Reading
LIST OF PLATES - [ Total Page(s): 1 ]PLATESPlate 1: Pictorial Illustration of workability of concrete Plate 2: Determination of density of concrete Plate 3: Testing of compressive strength of concrete ... Continue Reading
LIST OF FIGURES - [ Total Page(s): 1 ]LIST OF FIGURESFigure 4.1: Particle size distribution of fine aggregate Figure 4.2: Particle size distribution of crushed concrete Figure 4.3: Particle size distribution of Coarse Aggregate Figure 4.4: Compressive Strength for Natural Aggregate Figure 4.5: Compressive Strength for Recycled Aggregate at 5% Replacement Figure 4.6: Compressive Strength for Recycled Aggregate at 10% Replacement Figure 4.7: Compressive Strength for Recycled Aggregate at 20% Replacement Figure 4.8: Compressive Strength for Recycled Aggregate at 30% Replacement Figure 4.9: Compressive Strength of Va ... Continue Reading
TABLE OF CONTENTS - [ Total Page(s): 1 ]TABLE OF CONTENTSTITLED PAGECERTIFICATION DEDICATION ACKNOWLEDGMENT ABSTRACT TABLE OF CONTENT LIST OF TABLE LIST OF FIGURE CHAPTER ONE: INTRODUCTION 1.0 Background of the study 1.1 Problem Statement 1.2 Aim and Objectives 1.3 Justification of the study 1.4 Scope of the study CHAPTER TWO: LITERATURE REVIEW2.0 Literature Review 2.1 Crushed Aggregate Concrete 2.2 Size Distribution 2.3 Classification of Aggregate 2.4 Sources of crushed Aggregates 2.5 Material Properties 2.5.1Water 2.5.2Cement 2.5.3 Fine Aggreg ... Continue Reading
CHAPTER ONE - [ Total Page(s): 2 ]CHAPTER ONE INTROUDUCTION1.0 Background to the studyConstruction and Demolition Waste (C&D) is produced during new construction, refurbishment or renovation of buildings. Demolition waste includes materials from complete building removal as well as partial removals when aspects of the buildings are retained. Construction and Demolition waste includes bricks, concrete, masonry, soil, rocks, lumber, paving materials glass, plastics, aluminum, steel, drywall (gypsum), plywood (formwork), plumbing fixtures, electrical, and roofing materials. Construction and Demolition waste will hav ... Continue Reading
CHAPTER TWO - [ Total Page(s): 2 ]CHAPTER TWO2.0 LITERATURE REVIEWThe function of aggregate has the influence of the construction quality, therefore, the type and quality of aggregate are very important to be concerned. The fine and coarse aggregates generally use 10% to 25% of the concrete volume (20% to 35% by mass) and will influence the concrete’s freshly mixed and hardened properties, mixture proportions, and economy. Moreover, fine aggregate usually consists of natural sand with particles around 4.75mm (0.2 in); then in terms of coarse aggregate it is usually combination of gravels or crushed stone with part ... Continue Reading
CHAPTER THREE - [ Total Page(s): 4 ]CHAPTER THREE METHODOLOGY3.0 Research Methodology Investigation to determine moisture content, density test, Aggregate Crushed Value, Aggregate Impact Value, Slump test, Water absorption, Sieve Analysis and Compressive strength test was carried out. The total of sixty (60) concrete cubes of different mixes proportions were prepared with varying percentage. From each mixture 3 cubical specimens of 150mm x 150mm x 150mm were prepared and strength were determined at 7, 14, 21 and 28 days of curing ages. 3.1 Slump TestSlump test was carried out to det ... Continue Reading
CHAPTER FOUR - [ Total Page(s): 8 ]The compressive strength result shown that zero percent (0%) of crushed concrete has the highest strength value when compared to other percentages.4.4 Water Absorption RateThe water absorption coefficient test approach employed in this research is based on outlined in EN ISO 15148: -2002 It is significant that the specimens have the same initial moisture content. In this project, 150mm3 concrete cubes cured for 7, 14, 21, and 28 days, followed by drying at 105ËšC in the oven for a further 1 day and allow to cool at test condition until the weight of each specimen stabilized to within 0.1 ... Continue Reading
CHAPTER FIVE - [ Total Page(s): 1 ]CHAPTER FIVE5.0 CONCLUSION i. The research has demonstrated that the recycled aggregate (RCA) processed from waste concrete has poor mechanical and physical properties as compared to natural aggregate (NA). The existing mortar content of the RCA was the main cause for poor quality since it lowered its strength and increased its water absorption. ii. The test shows that crushed concrete cannot conveniently be used in the production of new concrete for construction.5.1 RECOMMENDATIONi. The use of recycled aggregate (RCA) in structural concrete is not technically ... Continue Reading
REFRENCES - [ Total Page(s): 1 ] REFERENCES Ajdukiewiez, A. and Kliszczewicz, A., (2002) Influence of recycled aggregates on mechanical properties of HS/HPC. Cement and Concrete Composites 24, pp 269-279.Chetna M Vyas, Darshana R Bhatt, (2013) Destructive Strength Properties of Recycled Coarse Aggregate, ISSN: 2278-3075, Volume2, Issue.Fumoto, T. and Yamada, M., (2006) Durability of Concrete with Recycled Fine Aggregate., American Concrete Institute, SP234, Durability of concrete, Seventh IntConf, Montreal, Canada, 457–472.Gomez, M.S. Shoberon, J.M.V. (2003). Relationship Between Gas Absorption ... Continue Reading
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ABSRACT - [ Total Page(s): 1 ]ABSTRACTIn the face of a possible scarcity of natural aggregates in the future in line with sustainable construction, this research investigates the feasibility of the use of recycled coarse aggregates as an alternative to natural coarse aggregates in structural concrete. The recycled coarse aggregate used in the research was processed from waste concrete. The percentage of recycled coarse aggregates by weight of all in aggregates in the test mixes were 0%, 5% 10% 20% and 30 % respectively. The properties of both natural and recycled coarse aggregates and the fresh and hardened properties of
... Continue Reading
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