Porosity and Water Absorption of Aerated Concrete with Varying Aluminium Powder Content

Shabbar, Rana; Nedwell, Paul; Wu, Zhiyong

doi:10.7763/ijet.2018.v10.1065

Cited by 12 publications

(9 citation statements)

References 18 publications

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“…Surface absorption capacity of aerated concrete increases with aluminium content and initially absorption rate is high and at the final time rate will be constant (Shabbar et al, 2018). So, the experimental result follows the trend of previous research work.…”

Section: Water and Surface Absorption Of Aac And Control Blocksupporting

confidence: 84%

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Influence of Aluminium and Autoclaving Temperature on the Properties of Autoclaved Aerated Concrete

2022

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Autoclaved aerated concrete (AAC) prepared by the mixing of ordinary Portland cement, lime powder, sand, aluminium powder and water. This study covers the variation of physical, mechanical and functional properties of autoclaved aerated concrete with autoclaving temperature and aluminium content and compared with that of normal weight cement mortar sample. In this work, two dosage of aluminium content of 0.4% and 0.8% of the dry weight of ordinary Portland cement and three different autoclaving temperature of 160oC, 180oC and 200oC were used. AAC sample with 0.8% aluminium and 160oC temperature had unit weight of 1490kg/m3 which was lowest among all samples including the control or normal weight cement blocks. Weight reduction of AAC sample was 31.53%. AAC sample with 0.4% aluminium and 200oC autoclaving temperature gave maximum compressive and tensile strength of 19.4MPa and 1.81MPa respectively which were close to that of normal weight concrete and strength of AAC increased with autoclaving temperature and decreased with aluminium content. In this research, the functional propertiesof AAC, absorption capacity was much higher than normal weight concrete and this capacity was increased with aluminium content and with decreasing autoclaving temperature and unit weight of AAC. For AAC with 0.8% aluminium and 160oC temperature gave maximum water absorption capacity (=9.93%). Again, surface absorption rate was higher for first 12hours and with time it would be constant because of its saturated position. Journal of Engineering Science 12(3), 2021, 11-17

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Section: Water and Surface Absorption Of Aac And Control Blocksupporting

confidence: 84%

“…The capacity of water absorption of autoclaved aerated concrete generally lies in the range of greater than 8% to 11.1% of its dry unit weight (Shabbar et al, 2018). Water absorption capacity of AAC depends on autoclaving temperature, pressure, aluminium content, unit weight of AAC etc.…”

Section: Water and Surface Absorption Of Aac And Control Blockmentioning

confidence: 99%

Influence of Aluminium and Autoclaving Temperature on the Properties of Autoclaved Aerated Concrete

2022

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“…Reactions during concrete formation as well as inadequate compaction result cause the resulting material to consist of both solid and a pore system [ 18 ]. In an aim to establish the porosity value of concrete-based materials, different methods are applied such as mercury porosimetry [ 18 ], stereological analysis [ 59 ], nitrogen adsorption [ 60 ] or the water absorption method [ 61 , 62 ]. It should be stressed that some publications indicate that mercury porosimetry is an inappropriate method for the measurement of the pore size and distribution in cement-based materials [ 63 ].…”

Section: Resultsmentioning

confidence: 99%

Effect of Polymer Additives on the Microstructure and Mechanical Properties of Self-Leveling Rubberised Concrete

et al. 2021

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The materials based on concrete with an addition of rubber are well-known. The interaction between concrete components and rubber particles is in the majority cases insufficient. For this reason, different substances are introduced into concrete-rubber systems. The aim of this paper is to establish the influence of five different polymer additives, i.e., 1. an aqueous dispersion of a styrene-acrylic ester copolymer (silanised) (ASS), 2. water dispersion of styrene-acrylic copolymer (AS), 3. anionic copolymer of acrylic acid ester and styrene in the form of powder (AS.RDP), 4. water polymer dispersion produced from the vinyl acetate and ethylene monomers (EVA), 5. copolymer powder of vinyl acetate and ethylene (EVA.RDP)) on the properties of the self-leveling rubberised concrete. Scanning electron microscopy has allowed to establish the interaction between the cement paste and rubber aggregates. Moreover, the compressive strength and flexural strength of the studied materials were evaluated. The results indicate that the mechanical properties depend extensively on the type as well as the amount of the polymer additive introduced into the system.

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“…Thermal conductivity is sensitive to the porosity of materials [ 47 ] and the porosity is related to the water absorption [ 48 ]. It can be considered that there are many voids when the water absorption rate is large [ 47 , 48 ]. Table 9 indicates the water absorption and dry density.…”

Section: Resultsmentioning

confidence: 99%

Effects of Thermal Conductive Materials on the Freeze-Thaw Resistance of Concrete

et al. 2021

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To solve the problem of black ice, many studies are being carried out. The key in recent days is enhancing the thermal conductivity of concrete. In this study, to improve the thermal conductivity, silicon carbide was used to substitute 50% and 100% of the fine aggregate. In addition, steel fiber is not only for enhancing the mechanical properties but could enhance thermal conductive material. Hence, the arched-type steel fiber was used up to a 1% volume fraction in this study. Furthermore, graphite was used for 5% of the volume fraction for enhancing the thermal conductivity. However, thermal damage would occur due to the difference in thermal conductivity between materials. Therefore, the thermal durability must be verified first. The target application of the concrete in this study was its use as road paving material. To evaluate the thermal durability, freeze–thaw and rapid cyclic thermal attacks were performed. The thermal conductivity of the specimens was increased with the increase in thermal conductive materials. Graphite has already been reported to have a negative effect on mechanical properties, and the results showed that this was the case. However, the steel fiber compensated for the negative effect of graphite, and the silicon carbide provided a filler effect. Graphite also had a negative effect on the freeze–thaw and rapid cyclic thermal attack, but the steel fiber compensated for the reduction in thermal durability. The silicon carbide also helped to improve the thermal durability in the same way as steel fiber. Comprehensively, the steel fiber enhanced all of the properties of the tests. Using 100% silicon carbide was considered the acceptable range, but 50% of silicon carbide was the best. Graphite decreased all the properties except for the thermal conductivity. Therefore, the content of graphite or using other conductive materials used should be carefully considered in further studies.

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Porosity and Water Absorption of Aerated Concrete with Varying Aluminium Powder Content

Cited by 12 publications

References 18 publications

Influence of Aluminium and Autoclaving Temperature on the Properties of Autoclaved Aerated Concrete

Influence of Aluminium and Autoclaving Temperature on the Properties of Autoclaved Aerated Concrete

Effect of Polymer Additives on the Microstructure and Mechanical Properties of Self-Leveling Rubberised Concrete

Effects of Thermal Conductive Materials on the Freeze-Thaw Resistance of Concrete

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