High-toughness geopolymer grouting material modified by ultra-high weight fibers and emulsified asphalt, preparation and application

Patent metadata

Field	Value
Publication number	US-11981602-B2
Application number	US-202117915490-A
Country	US
Kind code	B2
Filing date	Jan 25, 2021
Priority date	Nov 16, 2020
Publication date	May 14, 2024
Grant date	May 14, 2024

Abstract

The present invention relates to a high-toughness geopolymer grouting material modified by ultra-high molecular weight fibers and emulsified asphalt, and a preparation method and application thereof, wherein the grouting material comprises the following components in parts by mass: 4-12 parts of emulsified asphalt, 80-100 parts of a geopolymer, 103-126 parts of an alkali-activated solution, 2-3 parts of ultra-high molecular weight fibers and 30-35 parts of water. Compared to the prior art, the grouting material modified by ultra-high molecular weight fibers and emulsified asphalt is simple to prepare, has good fluiditygood, and matches well with road substrate; the good toughness and crack control capability of the ultra-high molecular weight fibers enables this novel grouting material to overcome the problem in durability of common geopolymer-based materials. The material of the present invention can be applied in filling voids beneath a slab of a cement concrete pavement and in the technology of non-excavation road reinforcement of a road base course and a subgrade of a high-grade highway.

First claim

What is claimed is:

1. A high-toughness geopolymer grouting material modified by ultra-high molecular weight fibers and emulsified asphalt, comprising following components in parts by weight:
4-12 parts of the emulsified asphalt;
80-100 parts of a geopolymer;
103-126 parts of an alkali-activated solution;
2-3 parts of the ultra-high molecular weight fiber; and
30-35 parts of water,
wherein the geopolymer comprises a combination of one or more of metakaolin, kaolinite, fly ash and slag,
wherein the emulsified asphalt is cationic emulsified asphalt which is medium-breaking or slow-breaking, the cationic emulsified asphalt having a screen residue of less than or equal to 0.1% and 1-day room-temperature stability of less than or equal to 1%,
wherein the ultra-high molecular weight fiber is polyethylene fiber with a molecular weight of 1,000,000-5,000,000, an ultimate tensile strain of 3%-7%, a fiber length of 6-18 mm, a nominal strength of 2900-3800 MPa and an elastic modulus of 100-120 GPa,
wherein the alkali-activated solution consists of 11-15 parts of sodium silicate solution and 1-4 parts of sodium hydroxide particles,
wherein a preparation method of the high-toughness geopolymer grouting material modified by ultra-high molecular weight fibers and emulsified asphalt comprises following steps:
step (1) weighing preset amounts of sodium silicate solution and sodium hydroxide particles to prepare the alkali-activated solution consisting of 11-15 parts of the sodium silicate solution and 1-4 parts of the sodium hydroxide particles, and allowing the prepared alkali-activated solution to stand for 18-36 h;
step (2) weighing each raw material according to the mass parts;
step (3) adding the geopolymer into a mixing pot of a cement paste mixer, turning on the mixer, and after mixing for 20-40 s, adding the alkali-activated solution into the mixing pot for a further mixing for 1-2 min;
step (4) adding the ultra-high molecular weight fibers into the mixing pot in 2-4 batches, and stirring quickly after the addition of all of the fibers until well-mixed to obtain a geopolymer-based slurry; and
step (5) adding the emulsified asphalt into the geopolymer-based slurry and mixing well to obtain the high-toughness geopolymer grouting material.

2. The high-toughness geopolymer grouting material modified by ultra-high molecular weight fibers and emulsified asphalt of claim 1 , wherein the geopolymer has a density of 2.2-2.7 g·cm −3 , an elastic modulus of 50-55 GPa, a tensile strength of 30-190 MPa, a compressive strength of 40-120 MPa and a fracture energy of 50-1500 J·cm −2 .

Assignees

• Univ Tongji

Inventors

• Zhu Xingyi
• Pang Yafeng
• Du Yuchuan

Classifications

• C04B28/003 Primary

  containing hybrid binders other than those of the polycarboxylate type · CPC title

• C04B28/006 Primary

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

• E01C7/147

  Repairing concrete pavings, e.g. joining cracked road sections by dowels, applying a new concrete covering (applying thin surface layers with other binder E01C7/35; repairing pavings in general E01C11/005; roughening by means of tools E01C11/24) · CPC title

• C04B2111/0075

  for road construction · CPC title

• C04B2111/70

  Grouts, e.g. injection mixtures for cables for prestressed concrete · CPC title