Cement mortar for repairing corrosion damage of concrete structure and preparation method of cement mortar

Abstract

The invention relates to cement mortar for repairing corrosion damage of a concrete structure and a preparation method of the cement mortar. At present, a cement-based mortar repair material which is generally used aiming at the concrete corrosion damage lacks pertinence and effectiveness for corrosion damage, and a repair failure problem still exists. The method comprises the following steps: dissolving a water reducing agent and a corrosion inhibitor into mixing water, and stirring and standing without precipitation; putting Portland cement, flyash, silica fume, quartz sand and an expanding agent into a stirring machine in proportion for dry stirring, and then adding the liquid for mixing and stirring for 2-3 minutes; adding the mixing water for stirring to obtain the cement mortar. The compound corrosion inhibitor adopted by the invention is good in cement adaptability, has good compatibility with additives such as the water reducing agent and the expanding agent, has no adverse effect on the strength of materials, and can improve the mobility of mixtures. The mortar has high matrix density, good antiseptic and corrosion-inhibiting capacity and good bonding performance, volume stability and constructability.

Description

Technical field [0001] The present invention is the field of building materials technology, which involves a concrete mortar and preparation methods for the repair of corrosion damage for concrete structures. Background technique [0002] Reinforced concrete is the most widely used type of building materials in highways, bridges and industrial construction engineering. With the increase of structural materials, the problem of durability degradation is increasingly prominent.The results of the durability of concrete show that reinforced concrete corrosion damage is the main durability disease, which has an impact on the structural level exceeding the frozen melting cycle and sulfate erosion.The degradation method of rust damage is the expansion stress caused by rust products, reducing the bonding performance of reinforced and concrete. At the same time, expansion stress will cause the concrete surface to produce cracked tendon cracks or protective layers of bloating and peeling. T...

AI Technical Summary

Problems solved by technology

[0011] Nowadays, the cement-based mortar repair materials commonly used in my country for concrete corrosion damage have outstanding mechanical properties such as compressive strength and flexural strength. However, for the special corrosion damage characteristics of concrete, the material properties lack pertinence and effectiveness. The repair function is only to protect However, the problem of repair failure caused by poor corrosion resistance, poor physical compatibility, etc. still exists, and the comprehensive repair effect cannot reach the expected goal, and some anti-rust ingredients contain toxic and harmful ingredients, which are harmful to human health. There is a potential threat to environmental protection, and the price of repair materials containing rust inhibitors is high, which curbs the effective development of corroded concrete repair work