| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Micro-mechanical Characterization of Non-carbonation and Decalcification Carbonation Zones of Cement Paste |
| ZHANG Chi*, LI Kefei, WANG Junjie
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| School of Civil Engineering, Tsinghua University, Beijing 100084, China |
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Abstract The article mainly discusses the methods to apply the indentation technology in characterizing the micro-mechanical properties of the non-carbonation and decalcification carbonation zones of the cement paste testing blocks. With the introducing of the scanning electron microscopy and electron probe technologies, it is concluded that the E-modulus and other micro-mechanical properties of the decalcification carbonation zones decline with the decrease of the Ca/Si mole ratio. The hardness and elastic modulus of them were reduced by 33% and 37%, respectively. At the same time, the nano-scratch, scanning electron microscopy, scanning electron probe, and thermogravimetric technologies were utilized in proper sequence to acquire the two zones' the surface inclination, surface roughness, element types, elemental composition and distribution conditions along the carbonation depth, as well as the quality losses during the thermogravimetry tests. The hardened cement pastes before decalcification absorb carbon dioxide, and the total quality of them will increase, with a certain micro-mechanical enhancement effect during the whole carbonation progress. However, the decalcification carbonation will lead to more loosen skeleton, as well as the rougher surface with more cracks and pores. The mass losses of cement paste powder ground from the non-carbonation and decalcification carbonation zones were 26.7% and 36.2% respectively during the thermogravimetry tests.
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Published:
Online: 2023-02-08
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| Fund:National Key Research and Development Plan (2017YFB0309904). |
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Corresponding Authors:
zhangchilaoma@163.com
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2023, Vol. 37 
