Properties of pumice-fly ash based geopolymer paste

2022 ◽  
Vol 316 ◽  
pp. 125665
Author(s):  
Maadh Abdulmuttaleb Hamid ◽  
Namık Yaltay ◽  
Mehmet Türkmenoğlu
Keyword(s):  
Fly Ash ◽  
Geopolymer Paste

The Effect of Dry Mix Sodium Hydroxide onto Workability and Compressive Strength of Geopolymer Paste

2020 ◽  
Vol 12 (9) ◽  
Author(s):  
A. Z. Mohd Ali ◽  
◽  
N. A. Jalaluddin ◽  
N. Zulkiflee ◽  
◽  
...  
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Sodium Hydroxide ◽  
Sodium Silicate ◽  
Alkaline Solution ◽  
High Emission ◽  
New Material ◽  
Curing Regime ◽  
Solid Form ◽  
Geopolymer Paste

The production of ordinary Portland cement (OPC) consumes considerable amount of natural resources, energy and at the same time contribute in high emission of CO2 to the atmosphere. A new material replacing cement as binder called geopolymer is alkali-activated concrete which are made from fly ash, sodium silicate and sodium hydroxide (NaOH). The alkaline solution mixed with fly ash producing alternative binder to OPC binder in concrete named geopolymer paste. In the process, NaOH was fully dissolved in water and cooled to room temperature. This study aims to eliminate this process by using NaOH in solid form together with fly ash before sodium silicate liquid and water poured into the mixture. The amount of NaOH solids were based on 10M concentration. The workability test is in accordance to ASTM C230. Fifty cubic mm of the geopolymer paste were prepared which consists of fly ash to alkaline solution ratio of 1: 0.5 and the curing regime of 80℃ for 24 hours with 100% humidity were implemented. From laboratory test, the workability of dry method geopolymer paste were decreased. The compressive strength of the dry mix of NaOH showed 55% and the workability has dropped to 58.4%, it showed strength reduction compared to the wet mix method.

Durability of Red Mud Based Geopolymer Paste in Acid Solutions

2016 ◽  
Vol 866 ◽  
pp. 99-105 ◽  
Author(s):  
Smita Singh ◽  
M.U. Aswath ◽  
R.V. Ranganath
Keyword(s):  
Mechanical Properties ◽  
Acetic Acid ◽  
Fly Ash ◽  
Red Mud ◽  
Acetic Acid Solution ◽  
Strength Loss ◽  
Acid Solutions ◽  
Test Results ◽  
Acid Attack ◽  
Geopolymer Paste

The present investigation is on the effect of red mud on the mechanical properties and durability of the geopolymer paste in sulphuric and acetic acid solution. Red mud and fly ash were used to form the geopolymer paste along with the alkalies. The variation of red mud in the paste composition was from 0% to 90%. Cylindrical shaped specimens of 1 inch diameter and 1 inch height were prepared. The specimens were immersed in 5% sulphuric acid and 5% acetic acid for 1, 7, 14, 28, 56 and 84 days and tested for weight loss, visual deformation, strength loss and colour of the solvent, based on the procedure specified by ASTM C 267 – 01. SEM/EDX Tests were performed on the geopolymer specimens. Test results show that initially, the strength of the geopolymer increased upon the addition of red mud. The strength was maximum when the percentage of red mud was 30%. The maximum strength obtained was 38 MPa for the paste containing 30% red mud using 10M alkali solution as against 31.69 MPa, when only fly ash was used. Geopolymer paste containing 30% and 50% red mud showed better resistance to acid attack. The strength loss was minimum for the samples containing 30% red mud in both inorganic and organic acid i.e. sulphuric and acetic acid.

scholarly journals Effects of microbial agents to the properties of fly ash-based paste

2018 ◽  
Vol 195 ◽  
pp. 01012
Author(s):  
Kiki Dwi Wulandari ◽  
Januarti Jaya Ekaputri ◽  
Triwulan ◽  
Chikako Fujiyama ◽  
Davin H. E. Setiamarga
Keyword(s):  
Fly Ash ◽  
Portland Cement ◽  
Cement Paste ◽  
Construction Material ◽  
Concrete Strength ◽  
Self Healing ◽  
Concrete Mixtures ◽  
Microbial Agents ◽  
Portland Cement Paste ◽  
Geopolymer Paste

Specific microbial agents such as bacteria are often used in concrete to improve its performance. Some microbes act as self-healing agents to close cracks in concrete, and to increase concrete strength. This paper presents a study to observe the effects of microbe addition to two types of concrete mixtures the fly ash-based, as geopolymer paste, and portland cement paste containing fly ash. Furthermore, the investigation was conducted to compare the properties of each paste, such as its compressive strengths, specific gravities, porosity, microstructures, and XRay diffracting properties. The results indicate that microbial activities positively affected the properties of both, portland cement paste and geopolymer paste. The result reported here strongly suggests that fly ash can be used to produce a high quality, but environmental friendly construction material when it’s mixed together with useful microbes.

Effect of microbes addition on the properties and surface morphology of fly ash-based geopolymer paste

2021 ◽  
Vol 33 ◽  
pp. 101596 ◽  
Author(s):  
Kiki Dwi Wulandari ◽  
Januarti Jaya Ekaputri ◽  
Triwulan ◽  
Setyo Budi Kurniawan ◽  
Widya Emilia Primaningtyas ◽  
...  
Keyword(s):  
Fly Ash ◽  
Surface Morphology ◽  
Geopolymer Paste

Preparation and microstructure of fly ash geopolymer paste backfill material

2019 ◽  
Vol 225 ◽  
pp. 376-390 ◽  
Author(s):  
Qi Sun ◽  
Shuo Tian ◽  
Qingwei Sun ◽  
Bing Li ◽  
Chang Cai ◽  
...  
Keyword(s):  
Fly Ash ◽  
Backfill Material ◽  
Paste Backfill ◽  
Geopolymer Paste

scholarly journals Compressive strength of medium calcium fly ash based geopolymer paste

2020 ◽  
Vol 419 ◽  
pp. 012027
Author(s):  
I N Guntur ◽  
M W Tjaronge ◽  
R Irmawaty ◽  
J J Ekaputri
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Geopolymer Paste

Synthesis and characterization of fly ash geopolymer paste for goaf backfill: Reuse of soda residue

2020 ◽  
Vol 260 ◽  
pp. 121045 ◽  
Author(s):  
Xianhui Zhao ◽  
Chunyuan Liu ◽  
Liming Zuo ◽  
Li Wang ◽  
Qin Zhu ◽  
...  
Keyword(s):  
Fly Ash ◽  
Synthesis And Characterization ◽  
Geopolymer Paste

Nano Geopolymer for Sustainable Concrete Using Fly Ash Synthesized by High Energy Ball Milling

2013 ◽  
Vol 313-314 ◽  
pp. 169-173 ◽  
Author(s):  
A.M. Mustafa Al Bakri ◽  
H. Kamarudin ◽  
M. Bnhussain ◽  
J. Liyana ◽  
Che Mohd Ruzaidi Ghazali
Keyword(s):  
Fly Ash ◽  
Ball Milling ◽  
Total Duration ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Sustainable Concrete ◽  
Entire Experiment ◽  
Energy Ball ◽  
Alkaline Activator ◽  
Geopolymer Paste

This paper presents the development of a nano geopolymer for sustainable concrete using fly ash synthesized by high-energy ball milling. In this paper, we report on our investigation of the effects of grinding on the binder properties and the optimization of the mix design for nano geopolymer paste. The research methodology consisted of synthesizing fly ash by using a high-energy ball mill to create nanosized particles and determining the formulation and mix proportions required to produce a nano geopolymer paste with the addition of an alkaline activator. The ratio of fly ash to alkaline activator and sodium silicate to sodium hydroxide were constant for the entire experiment which is 2.5. Ball milling was conducted for the total duration of six hours, during which particle size was reduced from 10 μm to 60 nm. The nano geopolymer were cured at temperature 70°C and then tested on 1st day and 7th day for compressive strength. Scanning electron microscopy (SEM) was used to characterize the shape, texture, and size of the milled fly ash.

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