Some researches and experiments have been carried out on the replacement of rubber crumbs in concrete, which have solved the problem of environmental concern. Therefore, sand and stone in the concrete mixture are partially replaced by rubber crumbs, both as fine aggregate and coarse aggregate of and 15% in this study. To determine the behavior of rubber concrete, all mixtures were compared with traditional concrete and also between coarse rubber and fine rubber that is substituted in place of stone and sand.
Research shows that replacing sand and stone with some crumb rubber degrades concrete over time. According to test results, tensile strength, workability and compressive strength decreased as the amount of shredded rubber, both fine and coarse, increased. On the other hand, as the amount of compound rubber (CCR) increased, the tensile strength also increased.
Although crumb rubber used in concrete reduced compressive and tensile strength, up to 5% MCR increased tensile strength by 5.30% at 28 days of curing. Compared between CRC coarse and fine crumb rubber, the fine crumb rubber gives 48.05% higher compression than coarse crumb rubber concrete and 24.1%.
INTRODUCTION
Purposes of the Research
Outline Of The Methodology
Scope of the Study
LITERATURE REVIEWS
- Introduction
- Previous Study
- Introduction
- Properties of element of concrete
- Cement
- AGGREGATE
- Water
- Tests of Aggregate
- Sieve analysis of Coarse aggregate
2021) are engaged in this research on the mechanical, durability, thermal and acoustic properties of concrete, including untreated and treated crumb rubber. It has been suggested that crumb rubber could become a lightweight alternative to fine aggregate in concrete. Up to a certain amount of rubber crumb is introduced, the compressive strength is higher (8%) than standard concrete.
Up to a certain point, the amount of rubber particles also increases the value of the split tensile strength of the concrete. Concrete made from crushed rubber is 11.2 percent more expensive than regular concrete with an additive of 3 percent. On this research, Faraz et al. 2015) worked on the Effect of Tire Crushing on Concrete Mixture.
2015) worked on crushed rubber concrete with partially replaced fine aggregates has stronger properties. Crushed rubber has a weaker binding capacity, which affects the strength of concrete. The strength of crushed rubber concrete is less than that of ordinary concrete when it comes to tensile strength.
While the acceptable strength of 33.47 N/mm2 is provided by the compressive strength of rubber crushed concrete with 10%. When compared to the strength of regular concrete, the flexural strength test on crushed rubber concrete reveals a weakness [8]. In this research, Mohammed et al. 2017) worked on the influence of rubber crumb on rubber characteristics.
A study showed that the use of crumb rubber in place of sand in concrete mixes improved the mechanical properties of the mixes. 2018) work on concrete's deformation properties when crumb rubber is used in a specific location of fine aggregate. Compared to traditional concrete, crumb rubber concrete (CRC) has several recognized mechanical performance disadvantages, especially in terms of compressive strength.
In this research, rubber crumb and RHA are added to OPC concrete to improve the mechanical properties of concrete. 2021) work on the experimental analysis of pretreated and untreated crumb rubber used in concrete.
3 .4.2 Specific Gravity Absorption Capacity of Fine Aggregate
- Unit Weight of Aggregate
- Sieve Analysis of Fine Aggregate
- Aggregate Crushing Value
- Concrete Mix Design
- Process Of Casting
- Batching
- Mixing
- Slump Cone Test Of Concrete
- Compaction of Concrete
- Curing Of Concrete
- Compressive Strength Test
- Spilt Tensile Strength Test
The unit weight of compacted or loose fine and coarse aggregates can be determined using this test procedure. Measure out a full third, then use your fingertips to smooth the top. Be careful not to forcefully hit the bottom of the mass when gluing the first layer.
Record the numbers to the nearest 0.1 lb and then calculate the weight of the measure along with its contents and the weight of the measure itself. M = Aggregate unit weight, lb/ft3 (kg/m3), G = Aggregate mass plus measure, lb. The particle length distribution of the aggregate is determined by sieve evaluation, known as aggregate grading.
If all the aggregate's particles are the same length, the compacted mass will contain more voids, while an aggregate made up of particles of different sizes will result in a mass with fewer voids. To prevent the piston from getting stuck in the cylinder, we make sure that the surface of the aggregate is level before we insert it like this. Then we hold the cylinder over a clean tray, pound the outside with a good rubber mallet until the sample particles are disturbed enough to allow the mass of the sample to fall freely into the tray.
We use a stiff bristle brush to transfer any fine particles that are stuck to the base plate, the bottom of the piston, or the inside of the cylinder to the tray. Most of the method of mixture design is empirical ratio base, chart and graphs developed from experimental investigations. For the purpose of working conveniently, the mix ratio was decided as 1:1.5:3 using the steps of ACI technique of mix ratio for M35 grade concrete.
Complete the entire test, from the beginning of the filling to the removal of the mold, without pausing and in less than two and a half minutes. The compaction process pushes the aggregate particles closer together and releases trapped air from newly placed concrete, increasing the density of the concrete. On average, structural designs are based on 28 days of strength, of which about 70% is achieved by the end of the first week.
The split cylinder test of the concrete method is used to determine the tensile strength of concrete. The test procedure conforms to ASTM Cylinder Standards C496 and uses 4 x 8 inch cylinder specimens.
TEST RESULTS AND ANALYSIS 4.1 General
Properties of The Recycled Concrete .1 Compressive Strength
- Spilt Tensile Strength Test
Concrete testing allows us to determine concrete's ability to withstand compressive stresses within structures, while addressing axial and tensile stresses through reinforcement and other techniques. 4.3, the compressive strength of concrete formed with stone aggregate and fine aggregate decreases as the percentage of crumb rubber increases. Comparing the whole fine aggregate and coarse aggregate, the strength value of concrete partially replaced by crumb rubber as fine aggregate gives higher strength than that replaced by coarse aggregate up to 43.5%.
The findings of tensile crack tests for concrete containing different percentages of crumb rubber as fine and coarse aggregate are summarized in Table 4.2. As can be seen, as the amount of rubber particles used increases, the tensile strength of the crack also increases. On the other hand, as the crumb rubber content increases, the tensile strength of some points also decreases.
It is important to note that using MCR at 5% in conventional concrete results in the maximum tensile strength of 3.38 Mpa. Then we grease the inside of the mold, and then pour the mixture into it in layers. We remove the sample from the water and dry it before starting the test.
The split tensile strength of concrete built with partial replacement with stone aggregate and with sand is shown in Fig.
DISCUSSION AND CONCLUSION 5.1 General
Conclusion
In addition, CRC application in concrete in many cases reduces the wasted tensile strength of concrete if we compare with normal concrete except MCR which is seen with a gradual increase. Overall, the tensile strength decreased with an increase in the percentage of crumb rubber both as fine and coarse aggregate.
Recommendations For Further Studies
WCR in concrete partially provides it and 27.56% lower compressive strength than traditional concrete for 5%, 10% and 15% of WCR replacement. d) In addition, CRC use in concrete in many cases reduces the spilled tensile strength of concrete if we compare with normal concrete except MCR which sees a gradual increase.
Experimental study on mechanical properties of recycled aggregate concrete using shredded rubber and polypropylene fiber. Properties of concrete using crumb rubber and rice husk ash as additive for solid pavement material in peat environment. Evaluation of mechanical properties and durability of concrete containing waste rubber tires as fine aggregate.
APPENDIX
FCR #30, #50, #100
MCR #8 
