Thermal and mechanical properties of structural lightweight concrete containing lightweight aggregates and fly-ash cenospheres

Zhou, Hongyu; Brooks, Adam L.

doi:10.1016/j.conbuildmat.2018.11.074

Cited by 105 publications

(36 citation statements)

References 24 publications

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“…Similarly, no noticeable differences between thermal conductivity or specific heat values were observed. As has been widely reported, thermal conductivity is highly related to LWAC density, with mixture composition having only a minor effect on this parameter [29,30,31]. However, some authors [32,33,34] have reported that NS and SF might contribute to a decrement in the thermal conductivity of cement-based composites (concretes, mortars, and pastes), but this effect increases only when a higher amount of admixture/additive is incorporated.…”

Section: Discussionmentioning

confidence: 98%

Influence of Nanosilica on Mechanical Properties, Sorptivity, and Microstructure of Lightweight Concrete

et al. 2019

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This study presents the results of an experimental investigation of the effects of nanosilica (NS) on the strength development, transport properties, thermal conductivity, air-void, and pore characteristics of lightweight aggregate concrete (LWAC), with an oven-dry density <1000 kg/m3. Four types of concrete mixtures, containing 0 wt.%, 1 wt.%, 2 wt.%, and 4 wt.% of NS were prepared. The development of flexural and compressive strengths was determined for up to 90 days of curing. In addition, transport properties and microstructural properties were determined, with the use of RapidAir, mercury intrusion porosimetry (MIP), and scanning electron microscopy (SEM) techniques. The experimental results showed that NS has remarkable effects on the mechanical and transport properties of LWACs, even in small dosages. A significant improvement in strength and a reduction of transport properties, in specimens with an increased NS content, was observed. However, the positive effects of NS were more pronounced when a higher amount was incorporated into the mixtures (>1 wt.%). NS contributed to compaction of the LWAC matrix and a modification of the air-void system, by increasing the amount of solid content and refining the fine pore structure, which translated to a noticeable improvement in mechanical and transport properties. On the other hand, NS decreased the consistency, while increasing the viscosity of the fresh mixture. An increment of superplasticizer (SP), along with a decrement of stabilizer (ST) dosages, are thus required.

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Section: Discussionmentioning

confidence: 98%

Influence of Nanosilica on Mechanical Properties, Sorptivity, and Microstructure of Lightweight Concrete

et al. 2019

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“…The mean value of the density is 462.5 kg/m 3 . The absolute volume mix constitutes per cubic meter of concrete based on volume is; cement 0.1175 m 3 , water 0.185 m 3 , coarse aggregate 0.3301 m 3 , air 0.02 m 3 and fine aggregate 0.3474 m 3 . The dry mass of sand can be obtained by multiplying the volume of sand and specific gravity.…”

Section: Methodsmentioning

confidence: 99%

“…This helps to improve the interface bond strength between the cement matrix and the rubber particles in the mixing and after mixing. The density or unit weight property of the fresh concrete was investigated by using a cylindrical mold with a constant weight of 4.66kg and volume 0.00687m 3 . During the cast of concrete, compaction was executed in three layers with 25 blows for each layer.…”

Section: Methodsmentioning

confidence: 99%

“…The use of recycled tire rubber as partial aggregate in concrete may have great potential to positively affect the property of concrete in a wide [2]. Due to its remarkable properties of dumping, rubber concrete can be used in several places where the durability or deformation has importance [3]. Scrap tires are usually considered in concrete mixtures in three main categories, such as chipped, crumb and ground rubber [4].…”

Section: Introductionmentioning

confidence: 99%

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A Comparative Study on the Mechanical Properties of Normal and Rubberized Green Concrete

Heylemelecot¹,

Kedir²,

Agon³

2020

AJCEA

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“…Mohamed Abdelrahman et al [3] were studied the microstructure of the foamed concrete to improve mechanical properties of foam concrete using Scanning electron microscopy (SEM). Hongyu Zhou and Adam L. Brooks [4] was performed and revealed the interaction mechanisms between fillers, aggregates, and the cement matrix to improve mechanical properties. The strength and other properties of foam concrete depend on the density of foam concrete.…”

Section: Introductionmentioning

confidence: 99%

Behavioural Studies on Triple Blended Foam Concrete

Satyanarayana¹,

Gayathri²

2020

E3S Web Conf.

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In recent days construction industry focuses on other than conventional concrete in infrastructural purposes like building etc., due to excess usage of cement, sand and other aggregates which leads depreciation of natural resources and effects on the environment. By utilization of lightweight bricks and foam concrete which reduces not only its self-weight but also improve resistance against heat and sound insulation and architectural features. The density of foam concrete varies from 300 to 1800kg/m3. Foam concrete composes of cement, water, fly ash and foaming agent without coarse aggregate. The function of foam is to create air bubbles in the cement-based slurry. The density of foam concrete depends on the quantity of foam added. The foam creates several pores with this effect; it has low thermal conductivity. As density of foam concrete is low at same time strength also low when compared to conventional concrete, so an attempt made to improve mechanical properties of foam concrete by adding admixtures like Silica fume and GGBS in different percentages. In these experimental studies, the workability and compressive strengths are mentioned

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Thermal and mechanical properties of structural lightweight concrete containing lightweight aggregates and fly-ash cenospheres

Cited by 105 publications

References 24 publications

Influence of Nanosilica on Mechanical Properties, Sorptivity, and Microstructure of Lightweight Concrete

Influence of Nanosilica on Mechanical Properties, Sorptivity, and Microstructure of Lightweight Concrete

A Comparative Study on the Mechanical Properties of Normal and Rubberized Green Concrete

Behavioural Studies on Triple Blended Foam Concrete

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