Comparison Study of Class F and Class C Fly Ashes as Cement Replacement Material on Strength Development of Non-Cement Mortar

Wardhono, Arie

doi:10.1088/1757-899x/288/1/012019

Cited by 27 publications

(12 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The difference between compressive strength of GPC specimens developed under ambient and oven curing process is found to be marginal. Earlier investigation also confirms that the strength of FA-C-based GPC may vary because of the different curing conditions (Topark-Ngarm et al, 2015;Wardhono, 2018). Gomaa et al (2020) have used five FA-C with different chemical and physical properties and reported that the Ca content in FA affects the assessment of compressive strength in heat-cured GPC.…”

Section: Sustainable Geo Polymer Concretementioning

confidence: 62%

“…20.44, 20.74, 25.62 and 28.12 MPa with an increase of NaOH concentration of 4, 6, 8 and 10 M. Similar behaviour is observed for other GPC Mix-III and Mix-IV. Some researchers confirmed using FA-C as a binding material to produce GPC with different molarities for obtaining the excellent strength under ambient curing process (Eric et al, 2020;Li et al, 2010;Topark-Ngarm et al, 2015;Wardhono, 2018).…”

Section: Workabilitymentioning

confidence: 99%

See 1 more Smart Citation

Strength and microstructure behaviour of high calcium fly ash based sustainable geo polymer concrete

Prasad

Daniel²,

Anand

et al. 2021

JEDT

View full text Add to dashboard Cite

Purpose Concrete is a building material widely used for the infrastructural development. Cement is the binding material used for the development of concrete. It is the primary cause of CO2 emission globally. The purpose of this study is to develop sustainable concrete material to satisfy the present need of construction sector. Geopolymer concrete (GPC) is a sustainable concrete developed without the use of cement. Therefore, investigations are being conducted to replace the cement by 100% with high calcium fly ash (FA) as binding material. Design/methodology/approach High calcium FA is used as cementitious binder, sodium hydroxide (NaOH) and sodium silicates (Na2SiO3) are used as alkaline liquids for developing the GPC. Mix proportions with different NaOH molarities of 4, 6, 8 and 10 M are considered to attain the appropriate mix. The method of curing adopted is ambient and oven curing. Workability, compressive strength and microstructure characteristics of GPC are analysed and presented. Findings An increase of NaOH in the mix decreases the workability. Compressive strength of 29 MPa is obtained for Mix-I with 8 M under ambient curing. A polynomial relationship is obtained to predict the compressive strength of GPC. Scanning electron microscope analysis is used to confirm the geo-polymerisation process in the microstructure of concrete. Originality/value This research work focuses on finding some alternative cementitious material for concrete that can replace ordinary portland cement (OPC) to overcome the CO2 emission owing to the utilisation of cement in the construction industry. An attempt has been made to use the waste material (high calcium FA) from thermal power plant for the production of GPC. GPC concrete is the novel building material and alternative to conventional concrete. It is the ecofriendly product contributing towards the improvement of the circular economy in the construction industry. There are several factors that affect the property of GPC such as type of binder material, molarity of activator solution and curing condition. The novelty of this work lies in the approach of using locally available high calcium FA along with manufactured sand for the development of GPC. As this approach is rarely investigated, to prove the attainment of compressive strength of GPC with high calcium FA, an attempt has been made during the present investigation. Other influencing parameter which affects the strength gain has also been analysed in this paper.

show abstract

Section: Sustainable Geo Polymer Concretementioning

confidence: 62%

Section: Workabilitymentioning

confidence: 99%

Strength and microstructure behaviour of high calcium fly ash based sustainable geo polymer concrete

Prasad

Daniel²,

Anand

et al. 2021

JEDT

View full text Add to dashboard Cite

show abstract

“…Class C FA has higher short-term strength than Class F FA (Aki et al 2017;Wardhono 2017). Since Class F FA has higher Si and Al content than Class C FA, long-term strength is extended due to the pozzolanic reaction (Adhikary et al 2014).…”

Section: Compressive Strengthmentioning

confidence: 99%

Study on Application of Class C Fly Ash for RCC dam in Nam Ngiep 1 Hydropower Project in Lao PDR

Aosaka

Yamamoto

Tsutsui³

et al. 2022

ACT

View full text Add to dashboard Cite

The Nam Ngiep 1 (NNP1) Hydropower Project in Lao PDR has constructed a 167 m-high roller compacted concrete (RCC) dam. Class C fly ash (FA) procured from the Mae Moh coal-fired power plant in Thailand has been selected as a supplemental cementitious material for the NNP1 RCC dam, to control hydration heat generation and improve workability. Though rarely used globally for RCC, it was found that the Class C FA was acceptable for the NNP1 RCC because it did not undergo a large temperature rise in its early age and because of the relatively high compressive strength of the concrete as the age in the medium-term and long-term as compared with general features of the concrete with Class C FA. To clarify the reaction mechanism for Class C FA, factors affecting the above features of Class C FA are analyzed and evaluated by observing FA particles and concrete core specimens of NNP1 RCC through a variety of devices, including Field Emission-Electron Probe Micro Analysis (FE-EPMA). This paper clarifies the reaction mechanism of the concrete with Class C FA and demonstrates its applicability for RCC dam and other structures.

show abstract

“…class 'F', class 'C' and class 'N', based on its main content of the constituent material. Due to their pozzolanic characteristics, class 'F' and class 'C' are commonly used as cement partial replacement material [8]. The main difference between the two classes is the calcium (Ca) content where class 'F' has Ca less than 10%,…”

Section: Fly Ash (Fa)mentioning

confidence: 99%

Effect of Alkali Activator Type on the Local UAE Sand Treated with Alkali Activated Binders

Jarah¹,

Arab²,

Junaid³

et al. 2020

World Congress on Civil, Structural, and Environmental Engineering

View full text Add to dashboard Cite

Unfavorable soil conditions may affect structures and pavement performance adversely during their service life. This study is a preliminary study on the use of Alkali-activated binders (AABs) known as geopolymers to stabilize surficial loose sand deposits at ambient temperature. Several mixes of fly ash (FA) and ground-granulated blast-furnace slag (GGBFS) to stabilize local dune-sands were investigated. Two different solutions were employed as reaction activators in this investigation namely sodium silicate solution (SS) and sodium hydroxide solution (SH). A precursor/soil ratio of 10% was used throughout this study. The factors studied for the geopolymerization process were activator/solids ratio, SS/SH ratio and FA/GGBFS ratio. The tested specimens were cured at a temperature of 35 degree Celsius for 8 days. Results showed that increasing SS/SH ratio from 0 to 0.5 causes a strength increase in all studied mixes, while increasing the ratio from 0.5 to 1 causes a strength reduction except in the mix with only GGBFS and 0% of fly ash. GGBFS reacts with sodium silicate to form the aluminu-silicate gel which strengthen the geopolymer sample. A preferred mix concluded in this study has a FA/GGBFS ratio of 50:50 and a SS/SH ratio of 0.5 due to its high strength and relatively economical value.

show abstract

Comparison Study of Class F and Class C Fly Ashes as Cement Replacement Material on Strength Development of Non-Cement Mortar

Cited by 27 publications

References 13 publications

Strength and microstructure behaviour of high calcium fly ash based sustainable geo polymer concrete

Strength and microstructure behaviour of high calcium fly ash based sustainable geo polymer concrete

Study on Application of Class C Fly Ash for RCC dam in Nam Ngiep 1 Hydropower Project in Lao PDR

Effect of Alkali Activator Type on the Local UAE Sand Treated with Alkali Activated Binders

Contact Info

Product

Resources

About