Concrete Mixture Design

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The mixture design that is shown in table 1 is the basic components that will go into each group of concrete. The concrete design shown in table 1 has a designed 28 days compression strength of 40 MPa (5800 psi). With the intention to test the concrete in a shorter time span, the compression was design at 40 MPa at 28 days in order to get a compression strength of 30 MPa after 7 days. This mixture design was determine from using a couple design procedure and also contacting a representative from Sika AG. (Designing and proportioning normal concrete mixtures). Using these sources, it was determined that the water to cement ratio would be 0.40. For self-consolidating concrete it is ideal to have a water to cement ratio between 0.38-0.42 in order …show more content…
This was something that was recommended by the associate of Sika AG. The maximum size of aggregates that were used in the concrete mixture is 20 mm. In my research, there will 5 different groups of concrete all differing in the amount of superplasticizer that will be in the concrete the first group will consist of no superplasticizer inside it. This will allow a control group to see the effects of the superplasticizer (SP). The second group will have a SP dosage of 5 ounces per 100 lbs. of cement. For each additional group of cement the ounces per 100 lbs. of cement will increase be 1 ounce. Using the design mixture, for one 20 cm cubed concrete specimen it will consist of 1.35 kg of water, 3.32 kg of cement while both the fine and coarse aggregates have a weight of 7.04 kg. The purpose of this research is to test the effect of the superplasticizer on the concrete bond strength with AFRP bars meaning these components will be kept consistent with all five groups only changing the amount of SP in the groups (Ghaly, A, & Almstead, L, …show more content…
As seen in figure 2, the formworks contain 9 slots with 20 cm cubed opening in each slots. With these slots, the appropriate dimension can be achieved for the concrete specimens. The formwork that were used were made out of wood and nailed together. There are a total of 30 concrete specimens that will be tested in this research. There are five different groups that the concrete cubes will be separated into. Each group will contain six specimens with each group differing in the amount of superplasticizer that is inside of the concrete. In each group of six, three specimen will go under a compression test with the other three going under a pull out test to test the bond behavior of the self-consolidating concrete and the aramid fiber reinforced polymer bars. To perform the testing on the concrete cubes, a testing machine from one of the Morgan State civil engineering labs will be used. This is the Instron Universal Testing Machine (UTM) which can be seen in figure 3. It is used in testing the tensile strength and the compressive strength of a material. To perform the pull out test in the UTM machine an apparatus is created in order to place the AFRP bars inside. It was created using two steel rectangular plates with an area of 114.5 squared inches with a thickness of 1 inch. They are connected with a 0.75 inch diameter bar at each corner of

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