Self-sensing high performance fiber reinforced geopolymer composites

Patent metadata

Field	Value
Publication number	US-11802083-B2
Application number	US-202016862761-A
Country	US
Kind code	B2
Filing date	Apr 30, 2020
Priority date	Feb 27, 2017
Publication date	Oct 31, 2023
Grant date	Oct 31, 2023

Abstract

The current invention is a novel addition to the field and comprises a self-sensing high performance fiber reinforced Geopolymer composite (HPFR-GPC) with self-sensing ability. In one or more embodiment, the self-sensing abilities are created by the addition of high performance fibers into a Geopolymer composites. The HPFR-GPC exhibits smart, high performance, energy efficient, and sustainability characteristics including: enhanced tensile ductility, toughness, and strain hardening (including crack width control); improved piezoresistive effects; utilization of industrial by-product; high resistance to acid attacks; and lightweight, low density. When compared to current available embedded or attachable sensors, the current invention offers lower cost, higher durability, and a larger sensing volume.

First claim

The invention claimed is:

1. A high performance geopolymer composite comprising:
a. a geopolymer binder;
b. polyvinyl alcohol fibers, wherein said polyvinyl alcohol fibers content is between 0.5 and 3%;
c. a chemical activator solution comprising sodium silicate and sodium hydroxide;
d. an additive comprising fly ash, wherein said fly ash to said chemical activator solution weight ratio is 0.5;
e. a superplasticizer, wherein said superplasticizer content is between 1 and 2 percent; and
f. carbon nanofibers, wherein said carbon nanofibers content is between 0.25 and 0.8 percent, and wherein the geopolymer composite has a percent difference in a maximum resistivity value and a minimum resistivity value under tensile load for frequencies of 5 Hz, 1 Hz, and 0.5 Hz, of about 0.25%.

2. The high performance geopolymer composite of claim 1 wherein the geopolymer composite has an average percent difference in resistivity under tensile loading for frequencies of 5 Hz, 1, Hz, and 0.5 Hz, of about 0.25%.

3. The high performance geopolymer composite of claim 1 further comprising rice husk ash.

4. The high performance geopolymer composite of claim 1 wherein said geopolymer binder comprises aluminosilicate rich industrial by-products.

5. The high performance geopolymer composite of claim 1 wherein the fly ash is a Class F Fly Ash from silica sand.

Assignees

• Univ Louisiana At Lafayette

Inventors

• Khattak Mohammad Jamal
• Khattab Ahmed

Classifications

• C04B28/006 Primary

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

• C04B14/386

  Carbon (carbon nanotubes C04B14/026) · CPC title

• C04B16/0641

  Polyvinylalcohols; Polyvinylacetates · CPC title

• C04B22/062

  of the alkali or alkaline-earth metals · CPC title

• C04B40/0046

  characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures · CPC title