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Tuesday, May 5, 2020 | History

1 edition of Reduction of concrete deterioration by ettringite using crystal growth inhibition techniques found in the catalog.

Reduction of concrete deterioration by ettringite using crystal growth inhibition techniques

Reduction of concrete deterioration by ettringite using crystal growth inhibition techniques

final report

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  • 26 Currently reading

Published by Dept. of Geological and Atmospheric Sciences, Iowa State University in [Ames, Iowa .
Written in English

    Subjects:
  • Concrete -- Deterioration.,
  • Concrete -- Testing.,
  • Concrete -- Chemistry.

  • Edition Notes

    Statementby Robert D. Cody ... [et al.]
    ContributionsCody, Robert D., Iowa. Highway Research Board., Iowa. Highway Division.
    Classifications
    LC ClassificationsTA440 .R37 2001
    The Physical Object
    Paginationviii, 104 p. :
    Number of Pages104
    ID Numbers
    Open LibraryOL3746098M
    LC Control Number2003426127
    OCLC/WorldCa47165296

    Reduction of Concrete Deterioration by Ettringite Using Crystal Growth Inhibition Techniques: Part II Field Evaluation of Inhibitor Effectiveness Abstract Report.   [2] Robert D C, Cody R D, Cody A M, et al. Reduction of Concrete Deterioration by Ettringite Using Crystal Growth Inhibition Techniques[R].Iowa DOT TR, Google ScholarAuthor: Chenguang Hu, Xiaoyan Wang, Ruiying Bai, Gang Liu, Xiaoxin Feng, Qingjun Ding.

    Final Report, TR, “Reduction of Concrete Deterioration by Ettringite Using Crystal Growth Inhibition Techniques” • Dr. Robert Cody, ISU, presented information for the final report TR He reviewed information on ettringite, and reported on the results of the tests run with different crystal. With the amount of ettringite crystals continuously increasing with immersion time, MT 2-s 15 Cody R. D. Cody A. M. Spry P. G. Reduction of Concrete Deterioration by Ettringite Using Crystal Growth Inhibition Techniques Iowa.

    () Reduction of Concrete Deterioration by Ettringite Using Crystal Growth Inhibition Techniques: Part II Field Evaluation of Inhibitor Effectiveness, TR, Transportation, Department of () Concrete Paving Notes Construction No.1, Iowa State University. Delayed Ettringite Formation in Concrete Jochen Stark, Katrin Bollmann Bauhaus-University Weimar / Germany 1. Introduction The problem of durability of concrete with cement as binding material comes more and more to the fore with the increased use of concrete, with File Size: KB.


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Reduction of concrete deterioration by ettringite using crystal growth inhibition techniques Download PDF EPUB FB2

Reduction of Concrete Deterioration by Ettringite Using Crystal Growth Inhibition Techniques by Robert D. Cody, Anita M. Cody, Paul G. Spry, and Hyomin Lee Many researchers have concluded that secondary or delayed ettringite is responsible for serious premature deterioration of concrete highways.

In some poorly performing Iowa. () Reduction of Concrete Deterioration by Ettringite Using Crystal Growth Inhibition Techniques, TR, Transportation, Department of. () Reduction of Concrete Deterioration by Ettringite Using Crystal Growth Inhibition Techniques: Part II Field Evaluation of Inhibitor Effectiveness, TR.

reduction of concrete deterioration by ettringite using crystal growth inhibition techniques Many researchers have concluded that secondary or delayed ettringite is responsible for serious premature deterioration of concrete highways. Secondary ettringite nucleation and growth must cause concrete expansion, because the only effect of these inhibitor chemicals is to reduce crystal nucleation and growth.

The current research project was designed to determine experimentally if secondary ettringite formation in concrete can be reduced by treating the concrete with commercial crystallization-inhibitor chemicals. The hypothesis is that if ettringite is reduced, a concomitant reduction of concrete expansion and cracking will by: Secondary ettringite nucleation and growth must cause concrete expansion because the only known effect of the inhibitor chemicals is to reduce crystal nucleation and growth, and the inhibitors cannot in any other way be responsible for the reduction in expansion.

phosphonate inhibitors were effective in reducing ettringite nucleation and growth in concrete, whereas the two other non-phosphonates were less effective. Of the two phosphonates, DTPMP (manufactured by Monsanto Company), was the most effective in inhibiting ettringite growth and subsequent expansion and cracking of the blocks (Fig.

2).File Size: 4MB. Reduction of Concrete Deterioration by Ettringite Using Crystal Growth Inhibition Techniques: Part II Field Evaluation of Inhibitor Effectiveness, TR, Some Iowa highway concrete constructed of coarse carbonate aggregate exhibits premature deterioration, which is, in part, caused by the growth of secondary minerals, including ettringite.

Secondary ettringite can be expansive; if the germination degree is higher than the crystalline growth degree, the product formed will be more or less crystallized, having a molar volume three to eight times larger than that of the initial solid.

If there is sufficient space for the ettringite to crystallize, needle-shaped crystals will be by: needle-like crystals, should not be interpreted as causing the expansion of deteriorating concrete.

To confirm that ettringite does not contribute to expansion of deteriorating cast-in-place concrete, Lerch investigated effects of cement sulfate levels on alkali-silica reaction and freeze-thaw action [Lerch, ]. By using cements of different sulfateFile Size: 2MB.

R.D. Cody, A.M. Cody, P.G. Spry, H. Lee Reduction of Concrete Deterioration by Ettringite using Crystal Growth Inhibition Techniques Iowa State University ()Cited by: crystal growth inhibition (CGI) based method for KHI evaluation.

The goal of development was to circumvent the inherent problem of stochasticity in induction time data, and, building on the basic principles of the SG technique, to provide a more reliable means for KHI assessment. This work hasCited by: Ettringite samples conditioned to 11% relative humidity were treated with methanol, ethanol and iso-propanol, and were examined using different analytical techniques (x-ray diffraction, Fourier.

Reduction of Concrete Deterioration by Ettringite Using Crystal Growth Inhibition Techniques: Part II Field Evaluation of Inhibitor Effectiveness Published Date: Author: Paul G Spry, Robert D Cody.

In the second phase, concrete deterioration was produced experimentally by immersing Iowa highway concrete samples in a sodium sulfate solution to further explore the role of ettringite in cracking.

In addition, as part of the second phase, a study of the effects of chemical environment on ettringite crystallization was by: An experimental study is conducted to investigate the effect of a range of parameters on concrete expansion and premature deterioration associated with delayed ettringite formation (DEF).Author: Hafiz Shaikh.

Cody, A. Cody, P. Spry et al., Reduction of Concrete Deterioration by Ettringite Using Crystal Growth Inhibition Techniques, Iowa State University, Iowa, IA, USA, H. Wang, Y. Dong, X. Sun, and W.

Jin, “Damage mechanism of concrete deteriorated by sulfate attack in wet-dry cycle environment,” Journal of Zhejiang University (Engineering Science), vol. 46, no. 7, pp. Cited by: 7. Delayed ettringite formation (DEF) is a chemical reaction with proven damaging effects on hydrated concrete.

Ettringite crystals can cause cracks and their widening due to pressure on cracked walls caused by the positive volume difference in the reaction. Concrete may show improvements in strength at early ages but further growth of cracks causes widening and spreading through the concrete.

Delayed ettringite formation (DEF) is known as the deterioration phenomenon that occurs in mortar or concrete cured at high temperature. It has been proposed that DEF expansion is affected by.Concrete prepared with coral reef sand intakes more sulphate from the Na 2 SO 4 solution, which forms more ettringite in the pores of concrete.

The formation of ettringite causes strength loss of both CPC and NPC concrete. The salt concentrations have marginal effects on the mass change of CPC by: The formation and expansion of ettringite crystals are discussed on the basis of principles of physico-chemistry.

It is suggested that ettringite forms by a through-solution mechanism and that expansive force results from crystallization pressure as well as swelling pressure converted from the reduction of chemical potentials in the reaction of ettringite by: