Project Title : Effects of Particle Size of Coarse Aggregates on the Compressive Strength of Fly Ash-based Geopolymer Concrete

Group Members :

1. Arillo, Ellen Rose J. 4. Dublin, Christine FC 7. Loyola, Hanzel Mae G.2. Collamat, Myrelle Charm O . 5. Francisco, Cristofer M. 8. Siervo, Eddieliza Joy V.3. Datiles, Philip A. 6. Julien, Mary Jane 9. Tan, Darwin Z.

Project Title : Dr. Ernesto J. Guades

Evaluator’s Analysis/Recommendations/Comments:

Question 1. Need to include effects of gravel/sand on the compressive strength of concrete/fly-ash based concrete in your mixture

Answer: This question was already been carried out and a study about the effect of aggregates on fly ash based geopolymer concrete is added on Chapter 2 (Review of Literature).

2.4 Aggregates on Fly-Ash Based Geopolymer Concrete

Joseph and Matthew (2012) studied the influence of aggregate content on the behavior of fly ash based geopolymer concrete. They have observed that the compressive strength of geopolymer concrete increases with increase in total aggregate content up to a value of 70% and then it decreases. They also observed that the compressive strength of aggregate for a value upto 0.35 and then it decreases. This phenomenon is true for all the values of geopolymer concrete increases with an increase in the ratio of fine aggregate to total the total aggregate content in the mixture considered (60%–75% by volume) during their study.

Question 2. Categorize the diameter of the gravel (range)

Answer: This question was already been carried out and the Table 3.1 in Chapter 3 (Materials and Methods) is revised accordingly in the revised proposal. The table below shows the table 3.1 (Mix Design of Geopolymer Concrete by mass) in the revised proposal.

Table 3.1.Mix Design of Geopolymer Concrete by mass

Mixture M1 M2 M3 M4 M5Alkaline : Fly Ash Ratio 0.55 0.55 0.55 0.55 0.55

Sieve DesignationParticle Size Range (mm)

#200 - 3/8”(4.75 – 9.5)

3/8” - 1/2” (9.5 – 12.5)

1/2” - 1” (12.5 – 25)

1” - 1 ½” (25 – 37.5)

1 ½” - 2” (37.5 - 50)

% by Mass

Fly Ash 16.67% 16.67% 16.67% 16.67% 16.67%

Fine Aggregates 24.5% 24.5% 24.5% 24.5% 24.5%

Coarse Aggregates 45.5% 45.5% 45.5% 45.5% 45.5%

Sodium Hydroxide 2.62% 2.62% 2.62% 2.62% 2.62%

Sodium Silicate 6.54% 6.54% 6.54% 6.54% 6.54%

Added Water 4.17% 4.17% 4.17% 4.17% 4.17%

Total Percentage (%) 100% 100% 100% 100% 100%

Supervisor and Students Declaration: We declare that we have read and discussed the contents of this paper containing the answers of the issues raised by the thesis proposal evaluators:

Students’ signature:

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