Air‐void characterisation of foam concrete

Nambiar, E.K. Kunhanandan; Ramamurthy, K.

doi:10.1016/j.cemconres.2006.10.009

Cited by 476 publications

(154 citation statements)

References 17 publications

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“…It would clearly be expected that the pore structure of foamed concrete has an important influence on its properties. These pores may be classified into gel pores, capillary pores and air voids (air entrained and entrapped pores) (Nambiar and Ramamurthy 2007a). In spite of their significant expected influence, the investigation and evaluation of the pore structure are seldom reported (Yu et al 2011).…”

Section: Introductionmentioning

confidence: 99%

“…Foamed concrete is a versatile material consisting of either Portland cement paste or cement filler matrix (mortar), in which air voids are entrapped by a suitable foaming agent (Jitchaiyaphum et al 2011;Nambiar and Ramamurthy 2007a;Othuman and Wang 2011;Ramamurthy et al 2009). It would clearly be expected that the pore structure of foamed concrete has an important influence on its properties.…”

Section: Introductionmentioning

confidence: 99%

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Pore Structure and Permeation Characteristics of Foamed Concrete

Hilal

Thom

Dawson

2014

ACT

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A study has been undertaken to investigate the pore structure characteristics, porosity and critical pore diameter of preformed foamed concrete with a density between 1300 and 1900 kg/m 3 , and its effect on the permeation characteristics, water absorption and permeability. Different measured and calculated methods were adopted to determine the above properties and a comparison between them was done. Porosity was measured by apparent, total vacuum saturation and mercury intrusion porosimetry (MIP) methods, while permeability was measured (by constant and falling head methods) and calculated (by the Katz and Thompson model). Total porosity and dry density are found to be clearly related. The critical pore diameter (from the MIP test) and the pore diameter size (>200nm) are found to be closely related to the permeability of foamed concrete.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pore Structure and Permeation Characteristics of Foamed Concrete

Hilal

Thom

Dawson

2014

ACT

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“…Additional parameters such as the spacing factor, airvoid size distribution, and shape can also be extracted via a surface scan of the prepared specimen. Based on their study, Nambiar and Ramamurthy (47) concluded that concrete specimens with a smaller size distribution of air voids exhibited higher strength. When a high amount of air entrainment was added to a specimen, bubbles tended to merge and form larger air voids.…”

Section: Optical Image Processing Techniquesmentioning

confidence: 99%

“…Based on the results from Nambiar and Ramamurthy (47), the cumulative frequency distribution at low dosages of air entrainment tends to be more uniform than at the higher dosages in cement-fly ash mixtures. This trend is seen to be less dominant in cement-sand mixes, which are the subject of the current feasibility study.…”

Section: Air-void Distribution Analysismentioning

confidence: 99%

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Feasibility Study of In-situ Characterization of Size Distribution of Air Voids in Concrete Pavements

Li¹,

Tong²,

Liu³

2013

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The Joint Transportation Research Program serves as a vehicle for INDOT collaboration with higher education institutions and industry in Indiana to facilitate innovation that results in continuous improvement in the planning, design, construction, operation, management and economic efficiency of the Indiana transportation infrastructure. https://engineering.purdue.edu/JTRP/index_html AbstractThis report concerns a feasibility study on the use of a non-destructive and non-invasive method to determine the size distribution of air voids in fresh concrete, which will be used for laying concrete pavement. A preliminary review of different techniques suggested that the measurement of the p-wave velocity of ultrasound pulses transmitted through a fresh concrete specimen offers the most straightforward approach. This report describes an experimental study to address the design of an experimental test rig, the selection of appropriate equipment, and the determination of the p-wave velocity in fresh cementitious materials. The paper starts with the ultrasound characterization of fresh cement and mortars. Then, the feasibility of using the ultrasound method to determine the air-void content in a fresh concrete specimen with a minimum thickness of 4" is examined. In addition to the discussions of the ultrasound characterization of fresh cementitious materials, this paper also reports on the development of a suite of MATLAB programs to characterize the air-void systems of hardened cementitious materials. The approach is based on image processing techniques used to analyze digital images of polished specimens collected with a flatbed scanner. The results will provide pertinent information on the airvoid systems in hardened cementititous materials. 17.

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Toughness behaviour of high‐performance lightweight foamed concrete reinforced with hybrid fibres

Dawood

Hamad²

2015

Structural Concrete

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Lightweight foamed concrete (LWFC) is.Foamed concrete is produced either by a prefoaming or a mixed foaming method. The prefoaming method involves the separate production of base mix cement slurry (cement paste or mortar) and a stably preformed (foaming agent with water) and then the thorough blending of this foam into a base mix. In mixed foaming, the surface-active agent is mixed with the base mix ingredients and foam is produced during the mixing process, resulting in a cellular structure in the concrete [3]- [5]. Structural lightweight concrete (SLWC) is similar to normal-weight concrete except that it has a lower density [6]. SLWC is defined as a concrete having a compressive strength of up to 17 MPa with a bulk density less than 1950 kg/m 3 ; structural lightweight concrete can be 25 % lighter than normal-weight concrete but have a compressive strength of up to 60 MPa [7]. The term high-performance concrete (HPC) is used for concrete mixes that possess the following three properties: highworkability, highstrength and high durability [8].Plain concrete is a brittle material, which results in poor fracture toughness, poor resistance to crack propagation and low impact strength. This inherent brittleness has limited its application in fields requiring high impact, vibration and fracture strengths. Fibres are used to modify the tensile and flexural strengths, toughness, impact resistance and fracture energy, and to arrest crack formation and propagation and thus improve strength and ductility [9]-[12]. Glass fibres improve the strength of the material by increasing the force required for deformation and enhance the toughness by increasing the energy required for crack propagation [13]. Ghorpade [14] investigated the effect of glass fibre on high-performance concrete with silica fume as an admixture. The maximum percentage increase in compressive strength was observed at 1 % fibre and 10 % silica fume content. The flexural strength increases with up to 1 % of fibre volume, thus, the strength decreases. Polypropylene fibres are the most popular of the synthetics. They are chemically inert, hydrophobic and lightweight. Polypropylene fibres reduce plastic shrinkage cracking and subsidence cracking over steel reinforcement [6]. Banthia and Gupta [15] investigated the influ-

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Air‐void characterisation of foam concrete

Cited by 476 publications

References 17 publications

Pore Structure and Permeation Characteristics of Foamed Concrete

Pore Structure and Permeation Characteristics of Foamed Concrete

Feasibility Study of In-situ Characterization of Size Distribution of Air Voids in Concrete Pavements

Toughness behaviour of high‐performance lightweight foamed concrete reinforced with hybrid fibres

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