Improving Surface Durability of High Volume Fly Ash Concrete with Application of Alkali Solution

Antoni, Antoni; Wattimena, Oswyn Karsten; Hardjito, Djwantoro

doi:10.4028/www.scientific.net/amr.626.636

Cited by 6 publications

(4 citation statements)

References 2 publications

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“…5). This result is comparable to the previous study on geopolymer mortar made from fly ash, with a value D nssm 4.849×10 -12 m 2 /s, and also to the High Volume Fly Ash Concrete with 60% fly ash content and water to binder ratio of 0.3 that has D nssm value of 14.345×10 -12 m 2 /s [8]. The smaller migration coefficient indicates higher resistance to penetration of chloride ions.…”

Section: Geopolymer and Green Technology Materialssupporting

confidence: 85%

Effect of Particle Size on Properties of Sidoarjo Mud-Based Geopolymer

Antoni

Wiyono

Vianthi

et al. 2014

MSF

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The eruption of Sidoarjo mud volcano that has been taken place since 2006 had caused significant damage to the local social environment, and until now there is no immediate solution that can be offered. Utilization of the Sidoarjo mud as construction material recently has gained some advancement by calcination of the mud, that make the previously inert material to become more reactive and to be more viable for its use as cement replacement or geopolymer precursor. This paper reports an on-going study to utilize the Sidoarjo mud as precursor of geopolymer by investigating the influence of particle size on the reactivity of the calcined Sidoarjo mud. Furthermore, durability properties of Sidoarjo mud-based geopolymer was also studied. The results show that making finer the mud particles by milling in longer period, using a rod-mill drum for 8 hours, can increase the reactivity of the mud. Compressive strength of geopolymer mortar can increase up to 155% when compared to the ones based on milling time of only 2 hours. Durability properties of sulphate acid resistance and chloride penetration are comparable to fly ash-based geopolymer, while the shrinkage measurement showing higher value.

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Section: Geopolymer and Green Technology Materialssupporting

confidence: 85%

Effect of Particle Size on Properties of Sidoarjo Mud-Based Geopolymer

Antoni

Wiyono

Vianthi

et al. 2014

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“…Penelitian lain dilakukan oleh Eliza, Barbara, & Carlo (2013) dengan mengaplikasi etil silikat pada permukaan beton, sehingga masuknya air ke dalam beton dapat dibatasi dan beton beton mempunyai ketahanan terhadap paparan klorida dan karbon dioksida lebih baik. Wattimena, et al (2013) melakukan penelitian dengan mengaplikasikan larutan alkali pada permukaan beton yang telah mengeras. Beton yang digunakan oleh Wattimena et al mempunyai mutu yang rendah, yaitu 24 MPa pada hari ke-28 dan 26 MPa pada hari ke-56.…”

Section: Pendahuluanunclassified

Peningkatan Durabilitas Beton Konvensional Dan Hvfa Yang Menggunakan Metode Perawatan Steam Curing Dengan Coating Larutan Alkali Dan Pasta Geopolimer

Prasetya¹,

Antoni

Hardjito

2015

duts

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Penelitian ini bertujuan untuk mengetahui peningkatan durabilitas beton dengan mengaplikasikan larutan alkali dan pasta geopolimer. Selain itu bagaimana pengaruh penggunaan metode perawatan steam curing pada beton, serta penggunaan variasi nilai molaritas dari coatings terhadap durabilitas beton. Pengujian durabilitas dibagi menjadi dua, yaitu pengujian penetrasi ion klorida dengan menggunakan Rapid Migration Test dan pengujian perendaman dalam larutan asam sulfat dengan kadar 10% dengan menggunakan metode Wet-dry cycle test. Dari pengujian yang telah dilakukan didapatkan hasil bahwa dengan pengaplikasian larutan alkali dan pasta geopolimer durabilitas dari beton konvensional dan beton HVFA dapat meningkat. Selain itu dengan penggunaan metode perawatan steam curing dan peningkatan nilai molaritas pada larutan alkali dan pasta geopolimer juga dapat meningkatkan durabilitas dari beton terhadap pengujian perendaman asam sulfat. Namun dampak dari penggunaan metode perawatan steam curing dapat membuat beton mempunyai nilai penetrasi ion klorida yang lebih besar dibandingkan dengan yang tidak dirawat dengan metode perawatan steam curing.

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“…As follows from [ 59 ], the removal of excess iron oxide increases the activity of ash and slag materials. In particular, the use of fly ash in concrete increases the strength and the standard level of durability compared to traditional compositions [ 60 ].…”

Section: Introductionmentioning

confidence: 99%

Coal Ash Enrichment with Its Full Use in Various Areas

Petropavlovskaya

Novichenkova²,

Sulman³

et al. 2022

Materials

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Increasing the percentage of recycling of various industrial waste is an important step towards caring for the environment. Coal ash is one of the most large-tonnage wastes, which is formed as a result of the operation of thermal power plants. The aim of this work is to develop a technology for the complex processing of coal ash. The tasks to achieve this aim are to develop a technology for the complex enrichment and separation of coal ash into components, with the possibility of their use in various applications, in particular: processing the aluminosilicate part as a pozzolanic additive to cement; carbon underburning for fuel briquettes; the iron-containing part for metallurgy and fertilizers. Complex enrichment and separation into components of coal ash were carried out according to the author’s technology, which includes six stages: disintegration, flotation, two-stage magnetic separation, grinding, and drying. The aluminosilicate component has a fairly constant granulometric composition with a mode of 13.56 μm, a specific surface area of 1597.2 m2/kg, and a bulk density of 900 kg/m3. The compressive strength for seven and twenty-eight daily samples when Portland cement is replaced by 15% with an aluminosilicate additive, increases to 30–35%. According to the developed technology, high-calorie fuel briquettes are obtained from underburnt with a density of 1000–1200 kg/m3, a calorific value of 19.5–20 MJ/kg, and an ash content of 0.5–1.5%. The iron-containing component, recovered by two-stage magnetic separation, has the potential to be used in metallurgy as a coking additive, in particular for the production of iron and steel. In addition, an effective micro-fertilizer was obtained from the iron-containing component, which: is an excellent source of minerals; improves the quality of acidic soil; helps soil microorganisms decompose organic matter faster, turning it into elements available to plants; promotes rooting of seedlings; helps to more effectively deal with many pests and diseases. As a result, the complete utilization of coal ash in various applications has been achieved.

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Improving Surface Durability of High Volume Fly Ash Concrete with Application of Alkali Solution

Cited by 6 publications

References 2 publications

Effect of Particle Size on Properties of Sidoarjo Mud-Based Geopolymer

Effect of Particle Size on Properties of Sidoarjo Mud-Based Geopolymer

Peningkatan Durabilitas Beton Konvensional Dan Hvfa Yang Menggunakan Metode Perawatan Steam Curing Dengan Coating Larutan Alkali Dan Pasta Geopolimer

Coal Ash Enrichment with Its Full Use in Various Areas

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