Composite aluminophosphate binder with good durability and bonding method thereof

Abstract

The invention provides a composite phosphate aluminate binder with good endurance quality. The composite phosphate aluminate binder comprises 15-75% of a first component, 10-20% of a second component, 20-40% of a third component, 8-20% of a component A, 0.2-0.4% of a component B and 15-40% of a component C, wherein the first component is a phosphorus aluminate gel material; the second component is any one or any combination of magnesium oxide, zinc oxide, aluminum oxide and ferric oxide; the third component is any one or any combination of ammonium phosphate, sodium phosphate and potassium phosphate; the component A comprises gypsum, citric acid and borax salt; the component B comprises a poly-impala acid water reducer; the component C is water. The invention also discloses a bonding method of the composite phosphate aluminate binder. The composite phosphate aluminate binder has the beneficial effects of small effects of ambient temperature and humidity, small contractility, good thermal stability, good long-term chemical stability, and good enduring functions such as the freezing-thawing resisting cycle performance and the dry / wet-resisting cycle performance.

Description

technical field [0001] The invention relates to a composite aluminophosphate binder, in particular to a composite aluminophosphate binder with good durability and a bonding method thereof. Background technique [0002] After many years of use of reinforced concrete structures, or due to the adverse effects of different corrosive media in the environment, steel corrosion, etc., there are durability problems; or due to reconstruction and expansion, structural components are required to have higher bearing capacity; local damage to structural members. Based on the comprehensive consideration of system reliability and economy, it is an important means to improve the service life of reinforced concrete structures to reinforce the damaged structural members so that they can still meet the requirements of safety, applicability and durability. The commonly used reinforced concrete structure reinforcement methods in engineering mainly include the following types: 1) Enlarged section...

AI Technical Summary

Problems solved by technology

Most of the supporting structural adhesives used in the current external FRP and steel plate reinforced concrete structures are epoxy-based organic polymers, and the upper temperature limit is less than 80°C. Some related tests were conducted according to the ISO834 standard. The results show that: Under standard heating conditions, the bond strength between carbon fiber cloth and concrete will be lost within 6 minutes

Secondly, organic polymer materials generally have the following disadvantages: 1. They are greatly affected by ambient temperature and humidity, and are prone to aging; 2. Organic polymer materials have large shrinkage and become brittle after aging; 3. Thermal stability, Poor long-term chemical stability, poor durability performance such as freeze-thaw cycle resistance and dry-wet cycle resistance

These shortcomings limit the scope of use of FRP and steel plate reinforced concrete. If these shortcomings of organic glue are not properly dealt with, there will also be certain safety hazards for the reinforced concrete structure.

Images