Unconfined Mechanical Properties of Nanoclay Cement Compound Modified Calcareous Sand of the South China Sea

Calcareous sand is characterized by low strength, multiporosity, and high-pressure shrinkage. This often leads to poor engineering properties. Therefore, it is often necessary to reinforce the calcareous sand in order to meet the actual engineering demand for bearing capacity. To study the modificat...

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Main Authors: Wei Wang, Jian Li, Jun Hu
Format: Article
Language:English
Published: Hindawi Limited 2020-01-01
Series:Advances in Civil Engineering
Online Access:http://dx.doi.org/10.1155/2020/6623710
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spelling doaj-03f61ae835034f6bb35e8a2836b81cf92021-01-04T00:00:30ZengHindawi LimitedAdvances in Civil Engineering1687-80942020-01-01202010.1155/2020/6623710Unconfined Mechanical Properties of Nanoclay Cement Compound Modified Calcareous Sand of the South China SeaWei Wang0Jian Li1Jun Hu2School of Civil EngineeringSchool of Civil EngineeringCollege of Civil Engineering and ArchitectureCalcareous sand is characterized by low strength, multiporosity, and high-pressure shrinkage. This often leads to poor engineering properties. Therefore, it is often necessary to reinforce the calcareous sand in order to meet the actual engineering demand for bearing capacity. To study the modification effect of calcareous sand of nanoclay by cement, mechanical tests and microscopic tests of the cement calcareous sand (CCS) modified by different nanoclay content and cement content were conducted. Through the unconfined compressive test, the mechanical properties of nanoclay and cement compound modified calcareous sand (NCCS) were studied. The micromechanism of nanoclay and cement composite modified calcareous sand was analyzed by SEM. Representative curves of data groups of stress and strain data were obtained by the fusion algorithm, which effectively circumvented the discrete distribution of determined data. Test results showed that the following: (1) The compressive property of CCS could be improved by the admixture of nanoclay, and the optimum admixture ratio was 8%. (2) The admixture of nanoclay could enhance the deformation modulus of CCS and improve the resistance of CCS against external load deformation capacity. (3) Nanoclay could increase the density of the internal structure of CCS and improve its mechanical properties.http://dx.doi.org/10.1155/2020/6623710
collection DOAJ
language English
format Article
sources DOAJ
author Wei Wang
Jian Li
Jun Hu
spellingShingle Wei Wang
Jian Li
Jun Hu
Unconfined Mechanical Properties of Nanoclay Cement Compound Modified Calcareous Sand of the South China Sea
Advances in Civil Engineering
author_facet Wei Wang
Jian Li
Jun Hu
author_sort Wei Wang
title Unconfined Mechanical Properties of Nanoclay Cement Compound Modified Calcareous Sand of the South China Sea
title_short Unconfined Mechanical Properties of Nanoclay Cement Compound Modified Calcareous Sand of the South China Sea
title_full Unconfined Mechanical Properties of Nanoclay Cement Compound Modified Calcareous Sand of the South China Sea
title_fullStr Unconfined Mechanical Properties of Nanoclay Cement Compound Modified Calcareous Sand of the South China Sea
title_full_unstemmed Unconfined Mechanical Properties of Nanoclay Cement Compound Modified Calcareous Sand of the South China Sea
title_sort unconfined mechanical properties of nanoclay cement compound modified calcareous sand of the south china sea
publisher Hindawi Limited
series Advances in Civil Engineering
issn 1687-8094
publishDate 2020-01-01
description Calcareous sand is characterized by low strength, multiporosity, and high-pressure shrinkage. This often leads to poor engineering properties. Therefore, it is often necessary to reinforce the calcareous sand in order to meet the actual engineering demand for bearing capacity. To study the modification effect of calcareous sand of nanoclay by cement, mechanical tests and microscopic tests of the cement calcareous sand (CCS) modified by different nanoclay content and cement content were conducted. Through the unconfined compressive test, the mechanical properties of nanoclay and cement compound modified calcareous sand (NCCS) were studied. The micromechanism of nanoclay and cement composite modified calcareous sand was analyzed by SEM. Representative curves of data groups of stress and strain data were obtained by the fusion algorithm, which effectively circumvented the discrete distribution of determined data. Test results showed that the following: (1) The compressive property of CCS could be improved by the admixture of nanoclay, and the optimum admixture ratio was 8%. (2) The admixture of nanoclay could enhance the deformation modulus of CCS and improve the resistance of CCS against external load deformation capacity. (3) Nanoclay could increase the density of the internal structure of CCS and improve its mechanical properties.
url http://dx.doi.org/10.1155/2020/6623710
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