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Stability of three-dimensional printable foam concrete as function of surfactant characteristics

结构与土木工程前沿:英文版 2023年第6期17卷 935-947页

作者： Uday BODDEPALLI Indu Siva Ranjani GANDHI Biranchi PANDA Department of Civil Engineering Indian Institute of TechnologyGuwahatiAssam781039India Sustainable Resources for Additive Manufacturing(SReAM)Laboratory Department of Mechanical EngineeringIndian Institute of TechnologyGuwahatiAssam781039India

Extrudability is one of the most critical factors when designing three-dimensional printable foam concrete.The extrusion process likely affects the foam stability which necessitates the investigation into surfactant properties particularly for concrete mixes with high foam contents.Although many studies have been conducted on traditional foam concrete in this context,studies on three-dimensional printed foam concrete are scarce.To address this research gap,the effects of surfactant characteristics on the stability,extrudability,and buildability of three-dimensional printed foam concrete mixes with two design densities(1000 and 1300 kg/m^(3))using two different surfactants and stabilizers(synthetic-based sodium lauryl sulfate stabilized with carboxymethyl cellulose sodium salt,and natural-based hingot surfactant stabilized with xanthan gum)were investigated in this study.Fresh density tests were conducted before and after the extrusion to determine stability of the foam concrete.The results were then correlated with surfactant qualities,such as viscosity and surface tension,to understand the importance of key parameters in three-dimensional printing of foam concrete.Based on the experimental results,surfactant solu1tion with viscosity exceeding 5 m Pa·s and surface tension lower than 31 mN/m was recommended to yield stable three-dimensional printable foam concrete mixes.Nevertheless,the volume of foam in the mix significantly affected the printability characteristics.Unlike traditional foam concrete,the variation in the stabilizer concentration and density of concrete were found to have insignificant effect on the fresh-state-characteristics(slump,slump flow,and static yield stress)and air void microstructure of the stable mixes.

关键词： foam concrete 3D printable concrete stability rheology air void microstructure

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Thermal upgrading of Hui-style vernacular dwellings in China using foam concrete

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Frontiers of Architectural Research 2012年第1期1卷 23-33页

作者： Xing Shi Wei She Hailong Zhou Yunshen Zhang Fei shi Wei Chen Key Laboratory of Urban and Architectural Heritage Conservation Ministry of EducationSchool of ArchitectureSoutheastUniversityNanjing 210096China bKey Laboratory of Urban and Architectural Heritage Conservation Ministry of EducationSchool of Material Science and TechnologySoutheast UniversityNanjing 210096China Shandong lnstitute of Architectural Design and Research Shandong 250001China

Architecturat heritage conservation is an important field in architectural research. The Hui-styte vernacutar dwetling is an essentialarchitectural heritage of China. Its hollow watt system, with horsehead-like upper corners, is a distinct architecturat feature that is worth preserving. However, the thermat performance of the hollow watt is relatively poor by today＇s standard. The current study developed a novel approach, whereby foam concrete was used to fill the voids inside the holtow watt to improve its thermat resistance. This approach was deemed cost effective, easy to learn, and capable of preserving the architectural integrity of the watt. Different types of foam concrete were prepared and tested. Testing results showed that the material properties of foam concrete are suitabte for thermaUy upgrading the hollow watt system. Ctimate chamber testing was conducted to investigate the effectiveness of the proposed thermat upgrading strategy. The testing resutts suggested that tilting the voids with foam concrete can effectively improve the overall thermal resistance of the holtow watt system by 24%, which is almost equal to the overall thermal resistance when using the more expensive commercial inorganic stucco system.

关键词： Hui-styLe vernaculardweLLins Thermal upgrade foam concrete Architectural heritase

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Experimental Investigation on Transmission of Stress Waves in Sandwich Samples Made of foam concrete

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Defence Technology（防务技术） 2013年第2期9卷 139-144页

作者： SHEN Jun REN Xinjian The Third Engineer Scientific Research Institute of the Headquarters of the General Staff State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology

A series of impact tests of sandwich samples were completed using a large-diameter split Hopkinson pressure bar (SHPB)device at different velocities. The interlayer is made of foam concrete, loess or sand. The stress peak value decay, energy decay and waveform dispersion characters are studied by comparing the incident waves with the transmission waves. The tests indicate that the foam concrete has the best capabilities of shock resistance and energy absorption, the loess comes second, and the sand takes third place.

关键词： non-metallic inorganic material foam concrete SHPB stress wave energy absorption

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Shale Stone and Fly Ash Landfill Use in Landslide Hazardous Area in Sirnak City with foam concrete

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Geomaterials 2014年第4期4卷 141-150页

作者： Yildirim I.Tosun Mining Engineering Department Engineering FacultySirnak UniversitySirnakTurkey

Sirnak City and the surrounding areas are on steeper slopes. There are sliding large land masses or rocks. Underground water and harsh climatic conditions contain high risk hazard areas in urban living site with higher population density. In order to eliminate landslides and related events, significant precautions should be taken. The mapping of landslide risk may ease to take precautions. Even the application of landfill rock may reduce water content of soil. In this research, fly ash and Mine Waste shale stone were used with low density foam concrete. Waste mixture at certain proportions decreased cement use. Shale stone as fine aggregate instead of fly ash in specific proportions improved mechanical strength and porosity. Hence landslide hazardous area could be safer for urban living.

关键词： foam concrete Landslide Stability Lightweight Aggregate

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foam concrete:State of the art in foaming agents

Foam concrete:State of the art in foaming agents

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作者： Guoxing Sun Tomi Nissinen Ivan M.L.Sham Nano and Advanced Materials Institute Limited(NAMI)

The application of foaming agents for the fabrication of foam concrete has been practiced more than 50 years in China.The beneficial use of foamed concrete in construction industry can be justified due to improved thermal and acoustic insulation of buildings with associated reduction of dead loads on structures and foundations.Desirable properties of foam require the foaming agent to be synthesized with high foam production ratio,good foam stability and small bubble size in alkaline cement pastes.This paper provides a review of foam constituents,fabrication techniques,classification,and applications in foam concrete.The review also provide a comprehensive insight into possible development of foam in the construction industry today.

关键词： foaming agent foam concrete surfactant

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