Fly ash-based eco-friendly geopolymer concrete: A critical review of the long-term durability properties

Trials has been made to produce efficient GPC which gives maximum strength. By-Products from industries such as Fly-Ash, Metakaolin and GGBS can be used in concrete replacement which in-turn reduces carbon-di-oxide (CO2 ) emission affecting to green house. Using the above said products also leads to reduction of water demand in concrete and also shows comparatively no effects on long term effects in concrete, these by-products can effectively be used in concrete production. The high silica content in Fly-Ash and Metakaolin increases the bonding in concrete which in-turn increases the mechanical properties of concrete. Geopolymer concrete of M50 grade was proposed to be produced using fly-ash and Metakaolin instead of cement.Alklai solutions Sodium Hydroxide (NaOH), Sodium Silicate (Na2SiO3) were replaced with water for better bonding and mixing. Molarity of Sodium Hydroxide with 10M and 12M was considered for this study. Ratio of Alkaline solution were considered as 1:2,1:2.5&1:3 to determine the optimum ratio which gives effective strength. In this experimental study, tests were carried on concrete specimens with percentage replacement of Fly-Ash with Buff Metakaolin in variable percentages of 20,40,60,80&100. Mechanical properties of concrete specimens were studied and were compared with control mix results.

Download Full-text

Effect of Carboxylic Acid (Benzene Crystallable) in Cement Concrete and Geopolymer Concrete

International Journal of Innovative Technology and Exploring Engineering - Special Issue ◽

10.35940/ijitee.f4175.059720 ◽

2020 ◽

Vol 9 (7) ◽

pp. 472-475

Keyword(s):

Tensile Strength ◽

Compressive Strength ◽

Fly Ash ◽

Carboxylic Acid ◽

Geopolymer Concrete ◽

Cement Concrete ◽

Split Tensile Strength ◽

Sealing Capacity ◽

Time Period

The present study appraises the recitals of carboxylic acid- based admixture to increase concrete water tightness and self-sealing capacity of the cement and geopolymer concrete. Outcomes of the previous studies in particular, adding 1% by cement mass of the carboxylic polymer reasons for reduction in the water dispersion under pressure of 7-day wet cured concrete by 50% associated to that of the conforming reference concrete. At 7 days, M4 mix compressive strength is about 43.5% less than M3 mix. The compressive strength of M4 increases and is about 37.6% less than M3 mix at 28 days of curing. At 7 days, M4 mix split tensile strength is about 17.5% less than M3 mix (cement concrete with 0.45 w/c ratio). The split tensile strength of M4 declines and is about 42.3% less than M3 mix at 28 days of curing. The strength of the geopolymer concrete tends to increase as the time period increases due to the presence of fly ash in it. So it is expected that geopolymer concrete will give more strength than cement concrete in long term with the presence of carboxylic acid

Download Full-text

Mechanical and Durability Properties of Fly Ash Geopolymer Concrete with Silica Fume

Journal of The Institution of Engineers (India) Series A ◽

10.1007/s40030-019-00400-z ◽

2019 ◽

Vol 100 (4) ◽

pp. 697-705 ◽

Cited By ~ 2

Author(s):

Sanghamitra Jena ◽

Ramakanta Panigrahi ◽

Pooja Sahu

Keyword(s):

Fly Ash ◽

Silica Fume ◽

Geopolymer Concrete ◽

Durability Properties

Download Full-text

Steel Reinforcement Corrosion in a Low Calcium Fly Ash Geopolymer Concrete

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.711.943 ◽

2016 ◽

Vol 711 ◽

pp. 943-949

Author(s):

Mahdi Babaee ◽

Arnaud Castel

Keyword(s):

Fly Ash ◽

Steel Corrosion ◽

Test Methods ◽

Geopolymer Concrete ◽

Reinforcement Corrosion ◽

Portland Cement Concrete ◽

Electrochemical Test ◽

Free Corrosion Potential ◽

Low Calcium

Geopolymer concrete (GPC) has significant potential as a more sustainable, low-embodied carbon alternative for ordinary Portland cement concrete (PCC). However; as a rather new engineering material, there are some concerns over the durability aspects of geopolymeric binders. In this study, performance of chloride contaminated reinforced GPC specimens manufactured using low calcium fly ash is investigated by long-term monitoring of corrosion parameters such as free corrosion potential and polarization resistance. It was found that low calcium fly ash GPC can perform as well as PCC during the propagation phase of corrosion; although, some conventional reference values of corrosion parameters which are indicative of severity of the steel corrosion in PCC are not suitable for GPC. Additionally, commonly used electrochemical test methods are successfully employed to assess the degree of reinforcement corrosion in geopolymeric binders within an acceptable level of accuracy.

Download Full-text

Strength Assessment on Geopolymer Concrete using Ceramic Waste Powder and M-Sand

International Journal of Innovative Technology and Exploring Engineering - Special Issue ◽

10.35940/ijitee.a8125.1110120 ◽

2020 ◽

Vol 10 (1) ◽

pp. 95-100

Keyword(s):

Fly Ash ◽

Ceramic Powder ◽

Source Material ◽

Fine Aggregate ◽

Geopolymer Concrete ◽

Polypropylene Fibres ◽

Strength Assessment ◽

Ceramic Waste ◽

Durability Properties ◽

Strength And Durability

The use of abundantly available wastes such as Fly ash and ceramic powder in construction industry in the form of geopolymer concrete turns out to be the search of a very promising building material for a sustainable future[15].This study has been undertaken to investigate the strength and durability properties of geopolymer concrete by adding ceramic powder in different percentage as source material in addition with flyash[16]. All investigations are mainly focused towards geopolymer concrete mainly with flyash as source material. In this study, ceramic waste powder is added since it is also one of the major waste material as flyash. Nowadays, almost all the construction are carried out with ceramic products which results with more ceramic waste powder. Thus this work focused to utilize this waste powder into geopolymer concrete. Characteristic strength and primary durability properties are carried out by adding ceramic powder with 50%,40% and30% with fly ash. Thus this paper focuses on varying the proportions of fly ash and ceramic waste powder (50:50, 60:40, 70:30) in geopolymer concrete incorporating with polypropylene fibres in percentage of 0.5%,0.75% and 1% in volume of concrete to evaluate its strength and durability characteristics. The alkaline activator solution used is a mixture of 10 molar Sodium hydroxide and Sodium silicate in the ratio 1:3. Ambient curing condition is applied for the specimens. M-Sand is used instead of fine aggregate, since many literature reveals addition of M-Sand gains more strength in geopolymer Concrete.

Download Full-text