Effect of Alkali activator/ Fly ash ratio on Strength and Workability of Low lime Fly ash based Geopolymer concrete

Reddy, B. Siva Konda; Varaprasad, J.; Reddy, K. Naveen Kumar

doi:10.26634/jce.1.2.1448

Cited by 3 publications

(4 citation statements)

References 2 publications

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“…Aluminum slag waste is a type of hazardous waste and is included in the B3 waste category. Based on Government Regulation (PP) Number 101 of 2014 concerning Management of Toxic and Hazardous Waste, handling B3 waste requires special treatment and is not the same as waste other than B3 (Reddy & Kumar, 2017).…”

Section: Aluminium Slagmentioning

confidence: 99%

Addition of Fly Ash and Aluminum Slag as Cement Substitute Materials to Cellular Lightweight Concrete

Risdianto

2023

ijebss

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Most of the construction buildings that are often found use concrete as the main building material. The development of technology makes more and more new types of modified concrete, one of which is lightweight concrete. Lightweight concrete that is often found is lightweight concrete CLC (Cellular Lightweight Concrete). The construction of non-structural elements of the building applies CLC lightweight concrete at a lower cost than standard concrete due to faster work, more temperature resistance, ease of handling, and lighter density. This study aims to find the optimum percentage and effect of using aluminum slag and fly ash as a partial replacement of cement in cellular lightweight concrete. The test object is printed in a molding size of 5x5x5 cm3. The use of aluminum slag is 0%, 1.5%, 3%, 4.5%, 6%, and 7.5%, while the use of fly ash is 15% of the cement weight. The tests carried out included volume weight, compressive strength, and water absorption at the age of 3, 7, 14, 21, and 28 days. The results of this study, it can be concluded that increasing the variation of aluminum slag with fly ash content remains at 15% in each variation as a cement substitution, the most significant variation is 1.5%. The optimum compressive strength test results at a variation of 1.5% of 4.1 MPa with the highest specific gravity of 752 gr/cm3, and water absorption of 66.67%, it all specimens at the age of 28 days.

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Section: Aluminium Slagmentioning

confidence: 99%

Addition of Fly Ash and Aluminum Slag as Cement Substitute Materials to Cellular Lightweight Concrete

Risdianto

2023

ijebss

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“…In addition, fly ash has a high silica content that can increase the compressive strength of concrete. The results showed that using fly ash percentages of 30% and 70% of cement can increase the compressive strength of lightweight concrete [5]. Another study was also conducted by adding a percentage of fly ash of 15% and a percentage of aluminum powder of 0.25%, resulting in a compressive strength of 23.75 MPa at 28 days [6].…”

Section: Introductionmentioning

confidence: 99%

The Effects of Fly Ash and Bottom Ash on the Properties of Aerated Concrete under Density-Based Mix Design

Radna Kurnia Sari,

Rosidawani,

Arie Putra Usman

et al. 2023

ARASET

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Lightweight concrete has the main characteristic of a lower density value than normal concrete, which ranges from 1400 to 1850 kg/m3 (ACI 213R) [1]. While density values generally show a decreasing trend along with decreasing mechanical properties. This type of lightweight concrete still needs to be improved in its application to elements that function but do not withstand loads (non-structural) due to its low mechanical properties. The main objective of producing lightweight concrete is its density. In contrast, another objective is the mechanical properties related to the use of lightweight concrete as a non-structural or structural material. Thus, physical properties in the form of density and mechanical properties in the form of compressive strength are important parameters in producing lightweight concrete. The mix method used in lightweight concrete is different from conventional concrete. The foaming agent used in manufacturing lightweight concrete will result in compressive strength and density results that are different from conventional concrete. In this study, lightweight concrete was made using the aerated technique: a foaming agent in aluminum powder and comprises cement, sand, fly ash, bottom ash, water, and superplasticizer. Fly ash as a substitute for cement and bottom ash as a substitute for sand with percentages of 0%, 15%, and 30%, and of 0%, 25%, and 50%, respectively. Those materials were aimed to optimize the composition of aerated concrete. The mix design was conducted with a density-based mix design of density targets of 1000 kg/m3, 1200 kg/m3, 1600 kg/m3, and 1800 kg/m3. The parameters used to assess the research results were slump value, setting time, density, compressive strength, and water absorption. While the consistency and stability values were found to be an indicator of the achievement of this density-based mix design. The performance indexes which demonstrate the attainment of compressive strength and predicted density in the aerated concrete, show that the mix designs meet the requirements of non-structural lightweight concrete. The mix of ingredients, particularly fly ash and bottom ash, has a considerable influence on the relationship between compressive strength and density in aerated concrete.

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“…Utilization of 100% fly ash in substituting cement as a binder has potential in concrete production [3][4][5]. Fly ash, which combined with a type of activator that contains silica is engineered as an adhesive material through a chemical reaction and produces a new kind of material called a geopolymer.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the type and dosage of activators used can produce a geopolymer matrix has the possibility to optimize this kind of excavated material product. So far, research results have shown that geopolymer concrete has very remarkable properties in strength and performance [3,5,8].…”

Section: Introductionmentioning

confidence: 99%

Contribution of Fineness Level of Fly Ash to the Compressive Strength of Geopolymer Mortar

Yunus

2017

MATEC Web Conf.

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Abstract. The development of geopolymers has allowed the flash as the substitution of cement in the application of concrete. Therefore, this will be very useful considering the quite abundant by-product materials from power plants burning coal in South Sumatera. However, the untreated fly ash from the source caused its fineness level unpredictable, whereas the fineness of binder in cementitious material significantly affects the mechanical properties of the harden. Therefore, this study aims to determine the contribution of the fineness level of fly ash to the compressive strength of geopolymer mortar, as well as its excellent composition. Type F fly ash from Tanjung Enim Power Plant was treated by filtering to obtain different fineness levels based on the fall zones of the ash. Activators used in geopolymer mixing were sodium hydroxide (NaOH) and sodium silicate (Na 2 SiO 3 ) with three activator/fly ash ratios which was 0.25, 0.35 and 0.45. The results showed that the fineness level based on fall zone as well as the activator to fly ash ratio significantly influenced the compressive strength of the geopolymer mortar. The compressive strength of the F4-P4 specimen of geopolymer mortar with zone-4 fly ash and an activator ratio of 0.45 achieved 28.2 MPa at 28 days.

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Effect of Alkali activator/ Fly ash ratio on Strength and Workability of Low lime Fly ash based Geopolymer concrete

Cited by 3 publications

References 2 publications

Addition of Fly Ash and Aluminum Slag as Cement Substitute Materials to Cellular Lightweight Concrete

Addition of Fly Ash and Aluminum Slag as Cement Substitute Materials to Cellular Lightweight Concrete

The Effects of Fly Ash and Bottom Ash on the Properties of Aerated Concrete under Density-Based Mix Design

Contribution of Fineness Level of Fly Ash to the Compressive Strength of Geopolymer Mortar

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