Effect of Glass Fibers on the Mechanical Properties of Plain Concrete

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Effect of Glass Fibers on the Mechanical Properties of Plain Concrete

The effect of Glass fibers on the mechanical properties of plain concrete

Capstone Design Project I: Literature Review and planning Project II.

Capstone Design Project II: Practical Part of the project. Carry out the experiment part of the project and write up the final part of the report.

Objective:

The main objective of this investigation is to determine the effect of combined glass fibers on the engineering properties of plain concrete such as; compressive strength, tensile splitting strength, flexural strength (modulus of rupture), static modulus of elasticity and water absorption. The results of the effect of the GLASS fibers on the engineering properties of concrete will be compared with same properties obtained from sound, control, samples, i.e samples without fibers.

 

Experimental Program

Details of test Specimens 

The following tests should be carried out to study the latter:

  1. compressive strength on 150x150x150 mm2 cubes [11]
  2. Indirect tensile splitting on 100×200 mm2 cylinders [12]
  3. flexural strength, Modulus of Rupture , MoR, on 100x100x500 mm3 prisms [13]
  4. static modulus of elasticity on 150×300 mm2 cylinders [14]
  5. water absorption on 150x150x150 mm3 cubes [15]

3– Concrete mixes and material properties:

Four mixes should be used to study the effect of the glass fibers and steel fibers on the engineering properties of concrete, mixes 1, 2, 3 and 4 contain 0kg/m3, 10 kg/m3, 15 kg/m3 and 20 kg/m3 of glass fibres respectively, table 1b. Mix 1, 0 kg/m3, was the control mix and the manufacturer.

 

Ingredients Source Unit Weight
OP Cement UCC kg/m3 400
Water MUN m3 0.20
20mm aggregate RAK kg/m3 700
10mm aggregate RAK kg/m3 330
5mm aggregate RAK kg/m3 515
Sand – F RAK kg/m3 295
Glass Fibers % (Mixes 1, 2, 3 and 4) RAK kg/m3 0, 10, 15, 20

Table 1b: Glass Fibers mix proportions for mixes 1 (Control), 2, 3 and 4.

4 – Production of the specimens:

The samples should be cast in steel moulds. The samples must be vibrated externally using a table vibrator. After trowelling the concrete surface smooth, the beams must be stored under polythene sheets. All the specimens must be unmoulded after one day and then cured for 28 days in water tank at 20oC and 100% relative humidity. The tests should be carried out within 1 hour of removal of the samples from the conditioning tanks.

5 – Apparatus and test procedure:

Use the 3000kN controlled compression machine to test all the samples. The rate of loading of 0.3N/(mm2.s) must be applied.

 

6 – Test results and discussion

Use the following table to tabulate the results.

 

 

Properties of Concrete

  

Glass Fiber

  

Combined Glass Fiber and Steel Fiber
Mix 1 – Control (0kg/m3) Mix 2 (10kg/m3) Mix 3 (15kg/m3) Mix 4 (20kg/m3) Mix 1 – Control (0kg/m3) Mix 2 (0.91kg/m3) Mix 3 (1.82kg/m3) Mix 4 (2.73kg/m3)
Cube Compressive Strength (N/mm2)                
Cylinder Compressive Strength (N/mm2)                
Indirect Tensile Test (N/mm2)                
Modulus of Rupture (N/mm2)  

 

  

 

  

 

  

 

        
Modulus of Elasticity (N/mm2)  

 

  

 

  

 

  

 

        
Water Absorption (g)       

 

  

 

  

 

  

 

        
 

Slump (mm)

  

 

  

 

  

 

  

 

  

 

  

 

  

 

  

 

 

Table 2 – The effect of Glass and steel fiber on the mechanical properties of concrete