Das, Pradip Sekhar and Bhattacharya, Manjima and Chanda, Dipak Kr and Dalui, Srikanta and Acharya, Saikat and Ghosh, Swapankumar and Mukhopadhyay, Anoop Kumar (2016) Failure and deformation mechanisms at macro- and nano-scales of alkali activated clay. Journal of Physics D-Applied Physics, 49 (23). Article No-235503. ISSN 0022-3727

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Here we report two qualitative models on failure and deformation mechanisms at macro- and nano-scales of alkali activated clay (AACL), a material of extraordinary importance as a low cost building material. The models were based on experimental data of compressive failure and nanoindentation response of the AACL materials. A 420% improvement in compressive strength (sigma(c)) of the AACL was achieved after 28 days (d) of curing at room temperature and it correlated well with the decrements in the residual alkali and pH concentrations with the increase in curing time. Based on extensive post-mortem FE-SEM examinations, a schematic model for the compressive failure mechanism of AACL was proposed. In addition, the nanoindentation results of AACL provided the first ever experimental evidence of the presence of nano-scale plasticity and a nano-scale contact deformation resistance that increased with the applied load. These results meant the development of a unique strain tolerant microstructure in the AACL of Indian origin. The implications of these new observations were discussed in terms of a qualitative model based on the deformation of layered clay structure.

Item Type: Article
Subjects: Structural Clay Products
Divisions: Non-Oxide Ceramics & Composites
Depositing User: Bidhan Chaudhuri
Date Deposited: 10 Nov 2016 07:39
Last Modified: 10 Nov 2016 07:39
URI: http://cgcri.csircentral.net/id/eprint/3710

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