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

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.