Novel Multifunctional Material for Workability of Geopolymeric System and its Process Thereof

Patent metadata

Field	Value
Publication number	US-2017349488-A1
Application number	US-201715616308-A
Country	US
Kind code	A1
Filing date	Jun 7, 2017
Priority date	Jun 7, 2016
Publication date	Dec 7, 2017
Grant date	—

Abstract

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.

First claim

We claim:

1 . A novel multifunctional material for addressing the issue of workability of geopolymeric system comprising: rice husk in the range of 6.2% to 8.5%, NaOH in the range of 1.7% to 31%, and optionally CTAB in the range of 0.62% to 0.85% and water in the range of 60 to 92%.

2 . A novel multifunctional material as claimed in claim 1 , wherein the material possesses following properties:
i) pH=14 ii) viscosity in the range of 7 mPa·s to 11 mPa·s

3 . A process for preparation of novel multifunctional material as claimed in claim 1 , comprising steps of:
a) digesting rice husk in the range of 6.2% to 8.5%, NaOH in the range of 1.7% to 31%, and optionally CTAB in the range of 0.62% to 0.85% in water in the range of 62% to 85% at a temperature in the range of 50° C. to 100° C. for a period in the range of 3 to 14 hours to obtain digested mass, b) filtering the digested mass of step a) to obtain the slurry of multi-functional material in the range of 50% to 80% containing various functional constituents lignin, hemicelluloses, cellulose, sodium silicate in desired nano size in the range of 40 to 100 nm, morphology and chemical architecture.

4 . The process as claimed in claim 3 , wherein the preferable temperature range is 60° C. to 90° C., and time period 4 to 12 hours.

5 . A process for the preparation of geopolymeric mortar/concrete cubes using novel multifunctional material system as claimed in claim 1 , comprising the steps of:
a) adding 0.25 to 1.5% slurry of multifunctional material as obtained in step b) of claim 3 with respect to fly ash in the standard geopolymeric mortar/ concrete mix and water and casting mortar/concrete cubes by known method, b) curing the said mortar/concrete cubes at a temperature in the range of 40 to 60° C. for a period in the range of 46 to 50 hrs to obtain finished geopolymeric mortar/concrete cubes.

6 . A process as claimed in claim 5 , wherein geopolymeric mortar cubes are obtained when slurry of multifunctional material is mixed with standard geopolymeric mortar comprising fly ash, sodium hydroxide, sodium meta silicate and water.

7 . A process as claimed in claim 5 , wherein geopolymeric concrete cubes are obtained when slurry of multifunctional material is mixed with standard geopolymeric concrete comprising fly ash, sodium hydroxide, sodium meta silicate , coarse aggregate and fine aggregates and water.

8 . A process as claimed in claim 5 , wherein geopolymeric mortar/concrete cubes posses compressive strength in the range of 25 to 60 MPa.

9 . A process as claimed in claim 5 , wherein mortar/concrete cubes being casted in the dimension of 7.06 cm×7.06 cm×7.06 cm and 15 cm×15 cm×15 cm.

10 . A process as claimed in claim 5 , wherein preferable curing time period is 48 hrs.

Assignees

• Council Scient Ind Res

Inventors

• Amritphale Sudhir Sitaram
• Chouhan Ramesh Kumar
• Mudgal Manish
• Verma Sarika
• Das Satyabrata

Classifications

• C04B18/248

  from specific plants, e.g. hemp fibres · CPC title

• C04B18/08

  Flue dust {, i.e. fly ash} · CPC title

• C04B28/006 Primary

  containing mineral polymers, e.g. geopolymers of the Davidovits type · CPC title

• C04B18/12

  from quarries, mining or the like · CPC title

• C04B22/0006 Primary

  Waste inorganic materials · CPC title