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Basic Properties of Calcined Underground Ant Nest Materials and Its Influence on the Compressive Strength of Concrete

Department of Structural Engineering, Tongji University, Shanghai 200092, China
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Materials 2019, 12(7), 1191; https://doi.org/10.3390/ma12071191
Received: 20 March 2019 / Revised: 5 April 2019 / Accepted: 9 April 2019 / Published: 11 April 2019
(This article belongs to the Special Issue Concrete and Construction Materials)
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Abstract

Underground ant nests are typically made of soil and rubble mixed with dead plant bodies, ant secretions, and other organic substances. The clay content is high, and the natural clay materials show pozzolanic activity after calcination. In this study, the underground ant nest materials of Iridomyrmex anceps, which is a common ant in the Shanghai area, are calcined and ground, and the material properties of calcined ant nest clay powder (CANCP) are characterized from six aspects: chemical composition, particle morphology, specific gravity, specific surface area, particle size distribution and pozzolanic activity index. The pozzolanic activity of CANCP is evaluated by the strength contribution rate of pozzolanic activity, revealing that CANCP is beneficial to the strength of the mortar system from an early age. The influence of CANCP on the compressive strength of concrete is analyzed using three aspects, namely, content, curing age and calcination temperature, and it is found that the three aspects of CANCP have a strong influence on the compressive strength of concrete. View Full-Text
Keywords: underground ant nest; calcination; calcined ant nest clay powder (CANCP); pozzolanic activity; strength contribution rate of pozzolanic; compressive strength underground ant nest; calcination; calcined ant nest clay powder (CANCP); pozzolanic activity; strength contribution rate of pozzolanic; compressive strength
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Zhou, W.; Zhu, P.; Qu, W. Basic Properties of Calcined Underground Ant Nest Materials and Its Influence on the Compressive Strength of Concrete. Materials 2019, 12, 1191.

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