In regard to Dr. Chatterji's comments, the author agrees that many investigators including Lea have pointed out the detrimental effect on strength associated with gypsum formation during sulfate attack on portland cement concrete. In the earlier literature, however, the strength loss due to gypsum f
The application of the Mackenzie model to the mechanical properties of cements: A reply to the Discussion by R. G. Wilson and S. Chatterji
✍ Scribed by P. Lawrence; A.J. Majumdar; R.W. Nurse
- Publisher
- Elsevier Science
- Year
- 1972
- Tongue
- English
- Weight
- 150 KB
- Volume
- 2
- Category
- Article
- ISSN
- 0008-8846
No coin nor oath required. For personal study only.
✦ Synopsis
This reply sets out to justify the derivation of the equation relating strength to porosity originally proposed in the first paper. The approximation used is reasonable and a more rigorous approach is not necessary. It is also shown that the Mackenzie equation for the bulk modulus requires no amendment when applied to liquid filled pores provided the liquid can escape from the pores when the system is stressed. Further refinement of the model is possible but the simple hydrostatic stress model is an adequate fit to much experimental data on the strength of cement pastes and mortars.
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We would like to thank Dr. Chatterji for his interesting and detailed comments on our paper. We agree with Dr. Chatterji that our thinking owes a great deal to the pioneering work of Powers and Steinour though our new data has led us to propose what we feel are significant changes to the original hy
With 23% of metakaolinite the mixture of expansive cement really contained a substantially smaller quantity of gypsum rock than the theoretically possible formation of ettringite should anticipate. The charged proportion of gypsum rock may rather cause the formation of monosulDhate, with some reserv