Delayed-coagulation high-toughness magnesium phosphate cement road rapid repair material

Abstract

The invention discloses a magnesium phosphate cement road rapid repair material which is prepared by compounding a phosphate-based powder material A, a magnesium oxide-based powder material B and a polymer emulsion C in proportion. By adopting a composite retarding technology, the operable time is effectively prolonged; the phosphorus slag powder is used as a mineral admixture, so that the hydration degree of the magnesium phosphate cement can be promoted while retarding; the multifunctional composite polymer emulsion is adopted, so that the toughness of the magnesium phosphate cement is improved while the waterproofness of the magnesium phosphate cement is improved; the obtained improved magnesium phosphate cement can show excellent operability, usability and stability, and the related preparation method is simple, low in cost and suitable for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of road construction materials, and in particular relates to a rapid road repair material of slow-setting high-toughness magnesium phosphate cement. Background technique [0002] Magnesium phosphate cement (MPC) is usually made of magnesium oxide (MgO) and phosphate as the main body, and composite borax and other retarding components are adapted in a certain proportion. Compared with Portland cement, MPC has the advantages of extremely fast setting and hardening, small shrinkage, and simple maintenance, making it more suitable for the field of rapid repair of concrete engineering, especially for small repairs on concrete pavements. [0003] However, there are still many deficiencies in the application of magnesium phosphate cement in road repair, which are mainly reflected in: 1) magnesium phosphate cement has a fast reaction speed and a very short setting time. Some products are less than 10min, which is d...

AI Technical Summary

Problems solved by technology

[0003] However, there are still many deficiencies in the application of magnesium phosphate cement in road repair, which are mainly reflected in: 1) magnesium phosphate cement has a fast reaction speed and a very short setting time. Some products are less than 10min, which is difficult to meet the needs of actual projects; 2) The main system of magnesium phosphate cement is MgO-NH 4 h 2 PO 4 and MgO-KH 2 PO 4 , the hydration products of the two systems all have the problem of water leaching, and the road is often in a watery environment, which makes it difficult to popularize and apply magnesium phosphate cement in humid areas; 3) Small-area thin-layer repairs often occur in road engineering , as an inorganic material, magnesium phosphate cement is difficult to meet the requirements of flexural strength and toughness.

[0004] Chinese patent "A kind of ultra-fast hard road repair material" (publication number: CN1415573A) discloses a kind of method that adopts magnesium oxide, ammonium dihydrogen phosphate, fly ash, boric acid to prepare road fast repair material; The repair prepared by this method The early strength of the material is high, and the setting time basically meets the construction requirements. However, during the hydration process, ammonium dihydrogen phosphate tends to release irritating ammonia gas, pollute the environment, and easily form pores on the surface, which is not conducive to construction leveling.

The Chinese patent "Quick-hardening and early-strength magnesium phosphate concrete and its preparation method" (publication number: CN101380518A) discloses a method for preparing road quick-repair concrete by adding water to magnesium oxide, phosphate, boric acid and coarse and fine aggregates; the concrete prepared by this method Early strength and high strength, good volume stability, but in the actual construction, the condensation is too fast, the mixing is difficult, and the construction is difficult

Chinese patent "a kind of magnesium phosphate cement-based composite material performance adjustment admixture" (publication number: CN 105330197 B) discloses a kind of admixture that adjusts the performance of magnesium phosphate cement, wherein adopts chloride salt as the setting adjustment component, but from its According to the disclosed embodiments, although the initial setting time has been prolonged, it is only 15min at the longest, and its operating time is still insufficient as a repair material; and, steel fibers are often added to road repair materials for toughening, and the addition of a large amount of chlorine will Corrosion of steel fibers commonly used in road repair materials, resulting in loss of performance and deterioration of the internal structure