Compressive strength, microstructure and thermal analysis of autoclaved and air cured structural lightweight concrete made with coal bottom ash and silica fume

Wongkeo, Watcharapong; Chaipanich, Arnon

doi:10.1016/j.msea.2010.01.089

Cited by 144 publications

(59 citation statements)

References 29 publications

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“…The dehydration of water molecules in hydrates such as C-S-H and ettringite took place within the range from room temperature to 200 °C [29,[49][50][51][52][53][54][55] . The second step of thermal degradation occurred between 325-550 °C, and the corresponding mass loss was associated with the dehydroxylation of free CH produced during curing 29,[49][50][51][52][53][54][55] . When the mortar specimens were cured, calcium hydroxide forming in them gradually combined with carbon dioxide of the surrounding air to form calcium carbonate 46 .…”

Section: Characterization Of the Mortar Specimensmentioning

confidence: 99%

Comparative study of the characteristics of nano silica - , silica fume - and fly ash - incorporated cement mortars

2014

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The structural characteristics of cement mortars, impregnated with nano silica (NS), silica fume (SF) and fly ash (FA), were comparatively studied using Fourier transform infrared spectrometer (FTIR), thermogravimeter-differential thermogravimeter (TG-DTG) and scanning electron microscope (SEM). The mechanical strengths of the specimens were determined at early (7th day) and standard (28th day) curing ages. The compressive strengths and flexural strengths developed in the mortar specimens containing NS particles were found considerably higher than those of the corresponding specimens of SF and FA over and above the control at both ages. FTIR, TG-DTG and SEM analyses results were consistent with the remarkable increase in the mechanical strength of the mortars with NS. These increases in the strengths of the mortars with NS are attributable to the nano sized particles and extensive surface area of NS. The nano sized particles, as nucleating agents, promoted the hydration of C 3 S and C 2 S and the formation of C-S-H phase. Plenty of active sites on the surface of NS particles induced their pozzolanic reactivity and the extent of bond formation between NS particles and free CH.

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Section: Characterization Of the Mortar Specimensmentioning

confidence: 99%

Comparative study of the characteristics of nano silica - , silica fume - and fly ash - incorporated cement mortars

2014

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“…Normally aerated concrete consists of a mixture of sand, lime, cement, gypsum, water, and an expanding agent [15]. [17] classified there are three divisions on the basic of strength and unit weight: low density or low strength concrete (0.7-2.0MPa, 300-800kg/m3) used for insulation; moderatestrength lightweight concrete (7-14MPa, 800-1360kg/m3) used for concrete block together with other a Corresponding author : eeydzah@uthm.edu.my applications for strength and structure lightweight concrete (17-63MPa, 1300-1900kg/m 3 ) [2]. This study focusing on the moderate-strength lightweight concrete as it is main application for non-load bearing wall that comes with insulations properties.…”

Section: Introductionmentioning

confidence: 99%

“…This has been agreed in Fu and Chung, 1997 cited in [5] study showed that low thermal conductivity is related to high air void. However, study showed by [2], proved that the thermal conductivity (Tc) differ, depends upon the pore structure of the lightweight aggregates, density of concrete and the cement paste matrix. Thus, the pore structure is one of the main factors affecting Tc.…”

Section: Introductionmentioning

confidence: 99%

Properties of Agro-Industrial Aerated Concrete as Potential Thermal Insulation for Building

Aminudin

Din

Hussin

et al. 2016

MATEC Web of Conferences

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Abstract. The present paper is aiming to provide an actual state of the development of non autoclaved Agro-Industrial aerated concrete by using multiple ashes as improvement of thermal behavior for building. The feasibility of Agro-Industrial wastes as lightweight concrete by utilizing the Palm Oil Fuel Ash (POFA) as binder replacement and bottom ash as fine aggregate was investigated in this paper. Portland cement, bottom ash, aluminum powder and lime (Ca(OH)2) were used in this study. The POFA was used to replace Portland cement and Hydrated Lime at 0%, 5%, 10% and 15% by weight and aluminum powder was added at 0.75% dry weight in order to form bubbles. The compressive strength, water absorption, porosity and the thermal conductivity test were carried out after the concrete were water cured for 7 days and later being exposed to the air and water until 28days. The results show that the 20% replacements give the optimum strength of 7.143MPa and 30% give the best thermal conductivity with 0.48W/mK. Hence, this study aim, was to develop an agro-industrial aerated concrete good in insulation but having an optimum strength. Hence, it has been found that the more the percentage of POFA is added the lower the thermal conductivity since the pore structure is increasing and by the optimization done, 30% replacement has been chosen as the best mix design for Agro-Industrial Aerated Concrete.

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“…[11], literatür bilgisine dayanarak göreceli olarak yüksek özgül ağırlığa sahip (1,9-3,0) AKAK'ların mühendislik uygulamalarında kullanılması gerektiğini belirtmişlerdir. Wongkeo ve Chaipanich [18], AKAK ve silika dumanı ile yapılan hafif yapı malzemesi üzerine basınç dayanım, mikro yapı ve termal analizler yapmış ve silika dumanı karışıma eklendiğinde AKAK'lı hafif yapı malzemesinin basınç dayanımının arttığını bulmuşlardır. %5 silika dumanı ve %20 KAK karışımı kullanıldığında Portland çimento kontrol grubundan daha yüksek basınç dayanıma ulaşıldığını belirlemişlerdir.…”

Section: Introductionunclassified

Atik Kazan Alti Külü Ve Pomza Elek Alti Atiğindan Geopoli̇mer Yapi Malzemesi̇ Üreti̇mi̇

Doğan-Sağlamtimur

Bilgil

2018

Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi

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ÖZPomza üretimi sırasında elek altı olarak tarif edilen ince malzeme açığa çıkmaktadır ve atık malzeme durumundadır. Endüstrilerde kömür yakılması sonrası açığa çıkan kazan altı külü de depolanamaz bir atıktır. Bu çalışmada atık değerlendirme amacıyla bu iki tip atık, alkali bir aktivatör olan sodyum hidroksit (NaOH) ile aktive edilerek geopolimer yapı malzemesi üretilmiştir. Deneysel çalışmada %50 atık kazan altı külü (AKAK)+%50 pomza elek altı atığı (PEAA) karıştırılarak oluşturulan atık dolgu malzemesine ağırlıkça %10, 15, 20 ve 25 oranında NaOH ilave edilmiştir. Numuneler 70, 100 ve 150 °C'ye ayarlanan etüvde 24 saat süresince kürlenmiştir. Daha sonra numunelerin fiziksel ve mekanik özellikleri belirlenmiştir. Basınç dayanım değerlerine göre optimum sonuç, %20 NaOH aktivatörlü 100 °C'de kürlenen numunede 16,5 MPa olarak bulunmuştur. Basınç dayanımlarında 28 günün sonunda 7 günlük değerlere göre %6-9 oranında artış gözlenmiştir. Su emme ve porozite değerlerinde, diğer yapı malzemelerine benzer sonuçlar elde edilmiştir. Atık malzeme esaslı NaOH aktivatörlü numunelerden dış tesirlere dayanıklı geopolimer yapı malzemesi üretilebilmiştir.Anahtar kelimeler: Atık yeniden kullanımı, geopolimer, kazan altı külü, pomza, yapı malzemesi GEOPOLYMER BUILDING MATERIAL PRODUCTION FROM WASTES OF BOTTOM ASH AND PUMICE ABSTRACTDuring pumice production, fine material that is stayed under the sieve is exposed as waste material. Bottom ash released into the air after burning coal in the industry is a non-deposit waste. In this study, for the aim of waste reuse, these two types of wastes were activated with sodium hydroxide (NaOH), an alkaline activator, and geopolymer building material was produced. In the experimental study, 10%, 15%, 20% and 25% NaOH were added to the filler material which was formed by mixing 50% waste bottom ash+50% pumice waste to produce geopolymer samples. The samples were cured in the oven that was set at 70, 100 and 150°C for 24 hours. Physical and mechanical properties of the samples were then determined. According to the compressive strength values, the optimum result was found to be 16.5 MPa in the sample activated with 20% NaOH cured at 100°C.Compressive strength values were increased (6-9%) in the samples at 28-day as compared to 7-day. Water absorption and porosity values were similar to those of other building materials. Geopolymer building material that is resistant to external influences can be produced from waste-based samples including NaOH activator.

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Compressive strength, microstructure and thermal analysis of autoclaved and air cured structural lightweight concrete made with coal bottom ash and silica fume

Cited by 144 publications

References 29 publications

Comparative study of the characteristics of nano silica - , silica fume - and fly ash - incorporated cement mortars

Comparative study of the characteristics of nano silica - , silica fume - and fly ash - incorporated cement mortars

Properties of Agro-Industrial Aerated Concrete as Potential Thermal Insulation for Building

Atik Kazan Alti Külü Ve Pomza Elek Alti Atiğindan Geopoli̇mer Yapi Malzemesi̇ Üreti̇mi̇

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