scholarly journals Non-Destructive Test on Granite Powder Concrete

2021 ◽  
Vol 9 (4) ◽  
pp. 357-360
Keyword(s):  
Fly Ash ◽  
Sodium Hydroxide ◽  
Silica Fume ◽  
Ambient Air ◽  
Rebound Hammer ◽  
Primary Parameter ◽  
Exploratory Investigation ◽  
Granite Powder ◽  
Test Outcomes ◽  
Non Destructive

This paper presents a definite exploratory investigation on penetrability qualities of granite powder (GP) concrete. The primary parameter researched in this investigation was M30 and M60 grades concrete with substitution of sand by GP of 0, 25,50 and 100 and concrete as fractional supplanting with super plasticiser, fly ash, slag and silica fume. The antacid arrangement utilized for present examination is the mix of sodium hydroxide and sodium silicate arrangement. The test example was 50 mm (thick) x 100 mm (diameter) cylinder shapes heat-relieved at 60°C in an oven. The variety was concentrated on the examples exposed to ambient air just as oven heat relieving. non-destructive tests on cylinders with the help of rebound hammer for a time of 28, 56, 90, 180 and 365 days. The test outcomes show that the substitution of rock and incomplete substitution of admixtures display better execution

scholarly journals Geopolymer Mortar Incorporating High Calcium Fly Ash and Silica Fume

2019 ◽  
Vol 65 (1) ◽  
pp. 3-16 ◽  
Author(s):  
V.C. Prabha ◽  
V. Revathi
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Sodium Hydroxide ◽  
Silica Fume ◽  
Sodium Hydroxide Solution ◽  
Test Results ◽  
Dense Microstructure ◽  
High Calcium ◽  
High Calcium Fly Ash ◽  
Binder Ratio

AbstractAn attempt was made in the present work to study the compressive strength and microstructure of geopolymer containing high calcium fly ash (HCFA) and silica fume. Concentration of sodium hydroxide solution 8M, 10M, 12M & 14M, liquid to binder ratio 0.5 and sodium hydroxide to sodium silicate ratio 2.5 were selected for the mixes. Geopolymer mortar test results indicated that the mix with 40% silica fume by the weight of HCFA yielded higher compressive strength under ambient curing. The XRD pattern typically shows the major portion of amorphous phase of geopolymer. The existence of C-A-S-H gel, N-A-S-H gel and hydroxysodalite gel products were observed through SEM which developed dense microstructure and thus enhanced strength of HCFA and silica fume geopolymer.

Effect of Treated Sago Pith Waste Ash and Silica Fume to the Mechanical Properties of Fly Ash-Based Geopolymer Brick

2021 ◽  
Vol 879 ◽  
pp. 100-114
Author(s):  
Izwan B. Johari ◽  
Md Azlin Md Said ◽  
Mohd Amirul B. Mohd Snin ◽  
Nur Farah Aqilah Bt. Ayob ◽  
Nur Syafiqah Bt. Jamaluddin ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Silica Fume ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Partial Replacement ◽  
Rebound Hammer ◽  
Compressive Strength Test ◽  
Sago Pith Waste

This paper investigates the effect of partial replacement of fly ash with sago pith waste ash and silica fume in fabricating the geopolymer mortar concrete. The mixtures of geopolymer mortar concrete were prepared by replacing sago pith waste ash and silica fume at 5% of total weight of fly ash. There were six specimens of geopolymer mortar cubes and bricks fabricated in this study. The specimens are tested with compressive strength test, rebound hammer test and ultrasonic pulse velocity test. The results from the tests are compared with some existing published works as to clarify the effect of replacing the fly ash with sago waste and silica fume on the strength of concrete. Comparisons had been made and concluded that the molarity of alkaline solution, Al3O2 and CaO influenced the development of compressive strength along the curing time of fly ash based geopolymer concrete.

Resistance of Concrete Protective Coatings in Different Chemical Environments

2015 ◽  
Vol 74 (4) ◽  
Author(s):  
Tayyaba Bibi ◽  
Jahangir Mirza ◽  
Saba Khan ◽  
Humna Hamid ◽  
Zanib Fida ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Silica Fume ◽  
Research Study ◽  
Protective Coatings ◽  
Control Sample ◽  
Chemical Exposure ◽  
Chemical Attack ◽  
Different Types ◽  
Non Destructive

The objective of this research study was to introduce concrete protective coatings which provide maximum resistance against chemical attacks. The admixtures-silica fume and fly ash were also used to enhance the impermeability of concrete to a greater extent. Tests conducted at various stages of the curing process allowed us to study the destructive and non-destructive strengths of the specimens. The mortar samples were coated with three different types of epoxy coatings and bitumen. They were then subjected to different chemical environments by immersing them in 10% standard solutions of each ammonium nitrate, sodium chloride and sulphuric acid. Drop in strength as a result of chemical exposure was considered as a measure of chemical attack. This was achieved by measuring the drop in compressive strength after 14 and 28 days of chemical exposure. The compressive strength results following chemical exposure indicated that the samples containing silica fume and fly ash (5% replacement of each by weight of cement) and the protective coating Epoxy-2 (E-2) proved to be more resistant to attacks. The control sample (without admixtures) showed a much greater degree of deterioration. Therefore, the application of E-2 coating in addition to silica fume and fly ash was invariably much more effective in improving the compressive strength as well as the resistance of concrete against chemical attacks. The results also indicated that among all the aggressive attacks, the sulphate environment has the most adverse effect on concrete in terms of lowering its strength.

scholarly journals Microstructure, Compressive Strength and Sound Insulation Property of Fly Ash-Based Geopolymeric Foams with Silica Fume as Foaming Agent

Materials ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3215
Author(s):  
Xinhui Liu ◽  
Chunfeng Hu ◽  
Longsheng Chu
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Sodium Hydroxide ◽  
Silica Fume ◽  
Water Glass ◽  
Sound Insulation ◽  
Insulation Property ◽  
Foaming Agent ◽  
Alkaline Activator ◽  
Insulation Performance

Geopolymer as an alternative to cement has gained increasing attention. The aim of this article is to study the influence of the silica fume content and activator type on the porous fly ash-based geopolymer with silica fume as foaming agent. Geopolymeric foams were fabricated using low-calcium fly ash, silica fume, and sodium-based alkaline activator as initial materials. The designed silica fume contents were 0, 15, 30, and 45 wt % and two kinds of activators of water glass and sodium hydroxide were used for comparison. Phase composition, microstructure, mechanical properties and sound insulation properties of as-prepared bulks were systematically investigated. It was found that, with increasing silica fume content, the density and compressive strength decreased simultaneously, whereas the porosity and sound insulation performance were effectively enhanced. At the silica fume content of 45% with sodium hydroxide as activator, the porosity was increased 3.02 times, and, at the silica fume content of 45% with water glass as activator, the mean sound insulation value of 43.74 dB was obtained.

scholarly journals Behavior of Geo-Polymer Concrete by using Fly Ash and GGBS

2019 ◽  
Vol 8 (4) ◽  
pp. 12245-12250
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Sodium Hydroxide ◽  
Room Temperature ◽  
Polymer Concrete ◽  
Geopolymer Concrete ◽  
Granulated Blast Furnace Slag ◽  
Ambient Room Temperature ◽  
Class F Fly Ash ◽  
Test Outcomes

Today the Serious issue, the world is confronting is the ecological contamination. In the development business primarily the generation of Portland concrete will causes the emanation of toxins which brings about high ecological contamination. But as we all known that Cement is the most consumed product in the world.And, 7% of the global carbon dioxide is going to be emitted by this process. Thus, we can diminish the contamination impact on condition, by expanding the utilization of modern side-effects in our development industry. Subsequently, Geopolymer concrete (GPC) is a unique kind of more eco-friendlier solid option in contrast to Ordinary Portland Cement (OPC) concrete. The main aim of this project is to study of effect of class F fly ash (FA) and ground granulated blast furnace slag (GGBS) of geopolymer concrete (GPC) mechanical properties at different replacement levels (MIX-1: FA100%-GGBS0%,MIX-2: FA75%-GGBS25%, MIX-3: FA50%-GGBS50%, MIX-4: FA25%-GGBS75%,MIX-5: FA0%-GGBS100%) utilizing Sodium silicate (Na2SiO3) and sodium hydroxide (NaOH) arrangements as an antacid activators.By considering diverse molaritys of sodium hydroxide asan alkaline activators.By considering different molaritys of sodium hydroxide as 0M,5M & 10M.And the Specimens were casted and cured for different curing periods at ambient room temperature to decide the GPC mechanical properties viz. compressive, split tractable and flexural quality. Test outcomes shows that so an expansion in GGBS substitution it will improve the mechanical properties of GPC at all ages at surrounding room temperature.

COMPRESSIVE STRENGTH AND THERMAL CONDUCTIVITY OF WATER AND AIR CURED PORTLAND CEMENT-FLY ASH-SILICA FUME MORTARS

2018 ◽  
Vol 17 (9) ◽  
pp. 2023-2030
Author(s):  
Arnon Chaipanich ◽  
Chalermphan Narattha ◽  
Watcharapong Wongkeo ◽  
Pailyn Thongsanitgarn
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Fly Ash ◽  
Portland Cement ◽  
Silica Fume

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.

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