Council of Scientific and Industrial Research

Ramesh Kumar Chouhan

Manish Mudgal

Sudhir Sitaram Amritphale

Anil Kumar

Sarika Verma

Avanish Kumar Srivastava

Barada Kanta Mishra

Satyabrata Das

Mohammed Akram Khan

Archana Singh

Navin Chandra

Deepti Mishra

Swati Lahiri

A geo-polymeric concrete and a process for preparing the geo-polymeric concrete is disclosed. The geo-polymeric concrete includes class F fly ash in a range from 10-20 wt %, of the design mix river sand in a range from 25-40 wt % of the design mix, a natural aggregate in a range from 15 to 40 wt % of the design mix, silica fume in a range from 1 to 2 wt % of class F fly ash, an alkaline activator solution and a superplasticizer in a range from 0.5 to 3 wt %. The materials used for preparing the superplasticizer are easily available in the market in abundance at a reasonable cost. The superplasticizer is economically viable and improves the workability of the geo-polymeric concrete. The presence of the superplasticizer does not affect the compressive strength of the geo-polymeric concrete.

Development of alcoholic sucrose-based superplasticizer for geo-polymeric concrete and its process thereof

The present invention relates to a novel multifunctional material for workability of geopolymeric system and its process thereof. The viscous characteristics in geopolymeric system are responsible for observed negligible workability of geopolymeric cement concrete system and which limits its broad application spectrum. The novel multifunctional material of the present invention prepared by digestion of siliceous agricultural waste i.e. Rice husk with aqueous alkaline materials involving simultaneous and synergistic chemical reactions among the various constituents of rice husk, aqueous alkaline compounds and optionally adding Cetyl trimethyl ammonium bromide (CTAB) to obtain in-situ synthesis of desired nano-sized multi functional agents lignin, hemicelluloses, cellulose, sodium silicate necessary for addressing the issue of workability and also improving the engineering properties of geopolymeric system for broad application spectrum.

Multifunctional material for workability of geopolymeric system and its process thereof

The present invention provides a composition for advanced hybrid geopolymeric functional materials possessing very broad application spectrum ranging from cementitious materials to advanced functional materials having 'Inorganic-Organic Hybrid' matrix in contrast to the limited application of conventional geopolymeric materials having 'Inorganic matrix' only. The invention further relates to a process for the preparation of these materials. The process obviates the need of external addition of sodium silicate which is one of the costliest and main raw materials in conventional geopolymerisation processes. Interestingly, in the present invention the sodium silicate has been synthesized in situ by designing of conditions for synergistic and simultaneous mechano-chemical reactions among the selected raw materials viz. inorganic and organic wastes under alkaline environment. This results in the formation of &#x201c;Hybrid inorganic-organic frame work&#x201d; of sodium silicate, which facilitates uniform dispersion of reacting species, thus resulting in the formation of homogeneous geopolymeric matrix with improved characteristics.

Composition for advanced hybrid geopolymeric functional materials and a process for the preparation thereof

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Bhopal, India

Ramesh Kumar Chouhan