Effects of Alkaline Solution on Properties of the HCFA Geopolymer Mortars

By A. Malkawi, M. Nuruddin, A. Fauzi, Hashem Al-Mattarneh, Bashar S. Mohammed. 2016

180 citations recorded by the source corpus.

Abstract Geopolymers are novel binding materials produced by the alkaline activation of rich aluminosilicate materials. Geopolymer binders are considered as green building materials that have increasing potential to replace the ordinary Portland cement in the concrete industry. This study investigated the alkali solution effects on the physical and mechanical properties of the high calcium fly ash based geopolymers. The parameters involved in this study were the NaOH solution molarity and the Na 2 SiO 3 /NaOH ratio. Three NaOH concentrations (8, 10, and 12 molars) were investigated. The Na 2 SiO 3 /NaOH ratio was varied between 1 and 2.5. The results showed that the studied parameters significantly affected the properties of the produced geopolymer mortars. The workability and setting time were found to decrease by increasing the NaOH concentration or by increasing the Na 2 SiO 3 /NaOH ratio. The influence of the NaOH concentration was higher on the workability and setting time while the Na 2 SiO 3 /NaOH ratio highly affected the compressive strength. The initial setting time was in the range of 45-105 minutes while the final setting occurred quickly after that within 70-115 minutes. Oven curing method resulted in high strength at early ages where all of the mixes were able to achieve more than 75% of the 28 days strength within the first 3 days. The 28-days compressive strength ranged between 60-85 MPa, which promotes the use of the high calcium fly ash for the production of early high strength geopolymer concrete.

Subfields: Building and Construction, Civil and Structural Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/b27c248b27220f66eb93b87bcddfba8a43f7ab52

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In Building and Construction

1. Muhammad Faisal Javed
2. Muhammad Khizar Khan
3. Shazim Ali memon

In Civil and Structural Engineering

1. Muhammad Faisal Javed
2. Lahiba Imtiaz
3. Muhammad Khizar Khan
4. Sardar Kashif Ur Rehman
5. Shazim Ali memon

In Materials Chemistry

1. Muhammad Faisal Javed
2. Lahiba Imtiaz
3. Muhammad Khizar Khan
4. Sardar Kashif Ur Rehman
5. Shazim Ali memon

Citations in the corpus

• A Review of Recent Developments and Advances in Eco-Friendly Geopolymer Concrete (2020, background): “[108] studied the effect of the alkaline solution on HCWA geopolymer mortars and observed that by increasing Na2SiO3/NaOH ratio or NaOH molarity, the workability decreases owing to a substantial influence of NaOH concentration on the flowability of geopolymer mortar.”