Comparison of lightweight aggregate and foamed concrete with the same density level using image-based characterizations

Chung, Sang-Yeop; Elrahman, Mohamed Abd; Kim, Ji Su; Han, Tong Seok; Stephan, Dietmar; Sikora, Paweł

doi:10.1016/j.conbuildmat.2019.03.270

Cited by 84 publications

(30 citation statements)

References 35 publications

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“…Detailed pore characteristics, such as pore size distribution and pore density contour, were also examined using micro-CT images and imaging tools [43]. More details about this method can be found in [39], with only a brief explanation of the CT imaging procedure presented in this paper. Figure 1 shows the imaging process used in this study.…”

Section: Microstructure Evaluation Using X-ray Micro-computed Tomogramentioning

confidence: 99%

“…Micro-CT is a nondestructive testing method that uses X-ray and can describe the inner structure of an object without damaging the specimen. For lightweight cementitious composites, micro-CT can be utilized to investigate the characteristics of microstructural features [36][37][38][39][40]. With the results obtained, the effectiveness of each additives in achieving better mechanical and thermal lightweight composites properties was compared.…”

Section: Introductionmentioning

confidence: 99%

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An Investigation of the Mechanical and Physical Characteristics of Cement Paste Incorporating Different Air Entraining Agents using X-ray Micro-Computed Tomography

et al. 2020

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Improving the thermal insulation properties of cement-based materials is the key to reducing energy loss and consumption in buildings. Lightweight cement-based composites can be used efficiently for this purpose, as a structural material with load bearing ability or as a non-structural one for thermal insulation. In this research, lightweight cement pastes containing fly ash and cement were prepared and tested. In these mixes, three different techniques for producing air voids inside the cement paste were used through the incorporation of aluminum powder (AL), air entraining agent (AA), and hollow microspheres (AS). Several experiments were carried out in order to examine the structural and physical characteristics of the cement composites, including dry density, compressive strength, porosity and absorption. A Hot Disk device was used to evaluate the thermal conductivity of different cement composites. In addition, X-ray micro-computed tomography (micro-CT) was adopted to investigate the microstructure of the air-entrained cement pastes and the spatial distribution of the voids inside pastes without destroying the specimens. The experimental results obtained showed that AS specimens with admixture of hollow microspheres can improve the compressive strength of cement composites compared to other air entraining admixtures at the same density level. It was also confirmed that the incorporation of aluminum powder creates large voids, which have a negative effect on specimens’ strength and absorption.

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Section: Microstructure Evaluation Using X-ray Micro-computed Tomogramentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Investigation of the Mechanical and Physical Characteristics of Cement Paste Incorporating Different Air Entraining Agents using X-ray Micro-Computed Tomography

et al. 2020

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“…A 30% substitution by fine fly ash in place of cement in a LFM mixture with a density of 1400kg/m 3 resulted in lower shrinkage strain measurements, compared to 0% fine fly ash that resulted in readings 2.6 times higher [7]. The cause is the restraint provided by the unreacted fly ash particles in the blend.…”

Section: Introductionmentioning

confidence: 97%

Influence of Oil Palm Empty Fruit Bunch (EFB) Fibre on Drying Shrinkage in Restrained Lightweight Foamed Mortar

Musa¹,

Mydin²,

Ghani³

2019

IJITEE

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Currently, the attention on natural fibre reinforced concrete based materials could be seen increasingly rising around the world in the quest for economic and environmental importance in the construction sector and built environment. Hence this research will focus on inclusion of oil palm empty fruit bunch (EFB) fibre on drying shrinkage of lightweight foamed mortar (LFM). There were three densities of LFM was considered which were 800kg/m³, 1100kg/m³ and 1400kg/m³.The size for the empty fruit bunch (EFB) fibre was between 15-19mm with diverse volume fractions of 0.15%, 0.30%, 0.45% and 0.60% by LFM mix volume. The drying shrinkage test was performed according to American Standard ASTM C157. The test specimen dimension is a 75mm x 75mm x 275 mm prism shaped utilising a standard stainless mould which conforms to ASTM C490. The experimental results revealed that the inclusion of 0.3% EFB fibre in 800 kg/m3 density, 0.45% EFB fibre in 800 kg/m3 and 1400 kg/m3 densities possess the lowest percentage value of drying shrinkage at the final age of testing compared to control specimen and other EFB fibre volume fraction. In addition, EFB fibre exhibits a micrometer level diameter and hydrophilicity attributes which make it highly dispersible. It also has a capability to be distributed homogeneously along with the synchronicity of a great fibres quantity in unit volume of LFM.

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“…Because of its good heat conservation and low density (300-1800 kg/m 3 ), aerated concrete can be used as a high-efficiency heat-insulating material in roofs, walls, and floors-as a form of block and panel-despite its relatively low mechanical properties [16][17][18]. As various properties of lightweight cementitious materials, such as density, compressive strength, elastic modulus, water drainage, heat conservation, and noise absorption, are highly related to their pore characteristics, various methods for analyzing the pore structures have been introduced [19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Porous Cementitious Materials Using Microscopic Image Processing and X-ray CT Analysis

et al. 2020

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The use of lightweight concrete has continuously increased because it has a primary benefit of reducing dead load in a concrete infrastructure. Various properties of lightweight concrete, such as compressive strength, elastic modulus, sound absorption performance, and thermal insulation, are highly related to its pore characteristics. Consequently, the identification of the characteristics of its pores is an important task. This study performs a comparative analysis for characterizing the pores in cementitious materials using three different testing methods: a water absorption test, microscopic image processing, and X-ray computed tomography (X-ray CT) analysis. For all 12 porous cementitious materials, conventional water absorption test was conducted to obtain their water permeable porosities. Using the microscopic image processing method, various characteristics of pores were identified in terms of the 2D pore ratio (i.e., ratio of pore area to total surface area), the pore size, and the number of pores in the cross-sectional area. The 3D tomographic image-based X-ray CT analysis was conducted for the selected samples to show the 3D pore ratio (i.e., ratio of pore volume to total volume), the pore size, the spatial distribution of pores along the height direction of specimen, and open and closed pores. Based on the experimental results, the relationships of oven-dried density with these porosities were identified. Research findings revealed that the complementary use of these testing methods is beneficial for analyzing the characteristics of pores in cementitious materials.

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Comparison of lightweight aggregate and foamed concrete with the same density level using image-based characterizations

Cited by 84 publications

References 35 publications

An Investigation of the Mechanical and Physical Characteristics of Cement Paste Incorporating Different Air Entraining Agents using X-ray Micro-Computed Tomography

An Investigation of the Mechanical and Physical Characteristics of Cement Paste Incorporating Different Air Entraining Agents using X-ray Micro-Computed Tomography

Influence of Oil Palm Empty Fruit Bunch (EFB) Fibre on Drying Shrinkage in Restrained Lightweight Foamed Mortar

Characterization of Porous Cementitious Materials Using Microscopic Image Processing and X-ray CT Analysis

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