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Effect Of Crushed Concrete As Coarse Aggregates In Production Of Concrete
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1.2 AIM AND OBJECTIVES
Aim:
The aim of this research work is to investigate the impact of crushed concrete in production of new concrete.
Objectives:
i. To determine the physical and mechanical properties of aggregate.
ii. To investigate the influence of varying percentage of crushed concrete on the mechanical properties of concrete.
1.3 JUSTIFICATION OF THE STUDY
In recent years, concrete has diversified its production. Condition this affects the aggregate consumption indirectly. In addition, demand against increasing the concrete economic conditions are good with increase of aggregate demand. In these situations, it is not appropriate to rely on one source of aggregate with continuing increase in demand and it will cause the shortage by natural aggregate in future. Thus, several alternatives should be established for the preparation of the possible effects on the aggregate demand in the future.
There are few studies have undertaken to produce a new aggregate. Most of the newly generated aggregate consists of waste materials such as glass, tires, broken bricks, concrete and other waste again and some of the results of this study have been practiced in the construction industry.
Therefore, this study examined the effectiveness of the use of crushed concrete produced from concrete waste in order to test the suitability and strength. It is hoped that this study will be the beginning of efforts to use recycled aggregate in construction material in the future.
1.4 SCOPE OF THE STUDY
The scope of this research work is to determine the effect of crushed concrete as coarse aggregate in the production of new 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. Th ... Continue reading---
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 Rec ... 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: Com ... 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 Source ... 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 ... 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 ... 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 ... 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 R ... 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, Montr ... Continue reading---
