Development of Alcoholic sucrose-based Superplasticizer for Geo-polymeric concrete and its process thereof

Patent metadata

Field	Value
Publication number	US-2022315490-A1
Application number	US-202217657249-A
Country	US
Kind code	A1
Filing date	Mar 30, 2022
Priority date	Mar 31, 2021
Publication date	Oct 6, 2022
Grant date	—

Abstract

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.

First claim

What is claimed is:

1 . A geo-polymeric concrete comprising:
class F fly ash in a range from 10-20 wt % of a design mix; river sand in a range from 25-35 wt % of the design mix; a natural aggregate in a range from 20 to 45 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 % of fly ash.

2 . The geo-polymeric concrete as claimed in claim 1 , wherein the superplasticizer comprises an alcoholic sucrose solution.

3 . The geo-polymeric concrete as claimed in claim 1 , wherein the superplasticizer comprises about 17 ml of commercial grade ethyl alcohol and 60 g of sucrose in 100 ml water.

4 . The geo-polymeric concrete as claimed in claim 1 , wherein the alkaline activator solution comprises 16 M sodium hydroxide and sodium silicate in water.

5 . The geo-polymeric concrete as claimed in claim 1 , wherein the natural aggregate has a size in a range from 6 mm to 20 mm.

6 . The geo-polymeric concrete as claimed in claim 1 , wherein the alkaline activator solution has a pH in a range from 13-14.

7 . The geo-polymeric concrete as claimed in claim 1 , wherein the geo-polymeric concrete has a compressive strength in a range from 50 to 65 MPa with a workable slump in a range from 0 to 190 mm after 28 days curing.

8 . The geo-polymeric concrete as claimed in claim 1 , wherein the geo-polymeric concrete with zero superplasticizer has a workability in a range from 0-10 mm slump with a compressive strength in a range from 59 to 62 MPa after 28 days curing.

9 . The geo-polymeric concrete as claimed in claim 1 , wherein the geo-polymeric concrete with about 0.8 wt % of superplasticizer has a workability in a range from 0-40 mm slump with a compressive strength in a range from 57 to 60 MPa after 28 days curing.

10 . The geo-polymeric concrete as claimed in claim 1 , wherein the geo-polymeric concrete with about 1.6 wt % of superplasticizer has a workability in a range from 0-150 mm slump with a compressive strength in a range from 57 to 60 MPa after 28 days curing.

11 . The geo-polymeric concrete as claimed in claim 1 , wherein the geo-polymeric concrete with about 2.4 wt % of superplasticizer has a workability in a range from 0-190 mm slump with a compressive strength in a range from 55 to 59 MPa after 28 days curing.

12 . A process for preparing a geo-polymeric concrete, the process comprising:
mixing 10-20 wt % of class F fly ash, 25-35 wt % of river sand, and 15 to 40 wt % of a natural aggregate in a motorized concrete mixer for about 5 to 8 minutes to obtain a pre-mixture;
adding 1 to 2 wt % of silica fume according to the wt % of class F fly ash to the pre-mixture to obtain a dry homogeneous mixture;
mixing sodium silicate (Na 2 SiO 3 ), sodium hydroxide (NaOH), and water to obtain an alkaline activator solution;
adding the alkaline activator solution to the dry homogeneous mixture for about 5 to 8 minutes to obtain a fresh geo-polymeric concrete;
adding 0.5 to 3 wt % of a superplasticizer to the fresh concrete and mixing for about 4 to 6 minutes;
filling into a 15 cm×15 cm×15 cm cube and vibrating for about 3 minutes; and
curing in a hot air oven at 60° C. for 48 hrs followed by curing at ambient temperature for 28 days to obtain a geo-polymeric concrete.

13 . The process as claimed in claim 12 , wherein preparing the superplasticizer comprises:
dissolving commercially available sucrose in tap water; stirring to obtain a sucrose solution with complete transparency; adding commercially available ethyl alcohol to the sucrose solution to obtain a mixture; stirring the mixture to obtain a transparent solution and leaving for about 30 minutes to get a crystal-clear superplasticizer.

14 . The process as claimed in claim 12 , wherein the alkaline activator solution has a pH in a range from 13-14.

15 . The process as claimed in claim 12 , further comprising measuring workability using the slump cone method.

16 . The process as claimed in claim 12 , further comprising evaluating compressive strength after 3, 7, 14- and 28-days of curing.

Assignees

• Council Scient Ind Res

Inventors

• Mudgal Manish
• Kumar Anil
• Chouhan Ramesh Kumar
• SINGH Archana
• Srivastava Avanish Kumar

Classifications

• C04B2103/32

  Superplasticisers · CPC title

• C04B2201/52

  High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC] · CPC title

• Y02W30/91

  Use of waste materials as fillers for mortars or concrete · CPC title

• C04B2103/10

  Accelerators; Activators · CPC title

• C04B22/062

  of the alkali or alkaline-earth metals · CPC title