Super early strong strength self-compaction material for engineering first-aid repair

Abstract

The invention provides a super early-strength self-compacting material used for engineering emergency repair. The material comprises the following components and contents with parts by weight: 25-60 parts of cement, 50-80 parts of sand, 60-150 parts of stone, 0.25-2.5 parts of a water reducing agent and 0.1-1.2 parts of a coagulant. The beneficial effects of the invention are that (1) one-hour compressive strength of patching materials is improved to more than 30MPa, after one-hour construction, the traffic can be resumed or the production can be recovered, and the like; (2) by optimizing the proportion, the contraction cracks of the patching materials are not produced when in construction at a large scale; (3) the patching materials can be applied to emergency construction under the condition of negative temperature.

Description

technical field [0001] The invention relates to a special engineering material, specifically a super-early-strength, self-compacting special material that can be used for emergency repairs of roads, bridges, high-speed railways, airport runways, metallurgy, coal mines and other projects. Background technique [0002] With the continuous development of my country's national economy, transportation infrastructure, industrial equipment foundation, port infrastructure, etc. are developing faster and faster, and most of these infrastructures use concrete materials. Due to factors such as engineering quality, service time, natural disasters, and wars, the concrete of these infrastructures will be damaged. As we all know, repairing these damaged facilities in time has great political, economic and military significance. For example, for the urban area of ​​Beijing, if the bridge repair is carried out according to the ordinary method, the traffic needs to be interrupted for at leas...

AI Technical Summary

Problems solved by technology

[0003] (1) Hourly strength is low, for example the rapid hardening expansive grouting material proposed in Chinese patent CN1356285A for emergency repair construction, 6 hours compressive strength has only 20Mpa; A kind of road surface quick repair concrete material proposed in Chinese patent CN1556058A, 1 hour compressive strength Only 10 ~ 20Mpa; and can not meet the requirements of some large vehicles and aircraft takeoff and landing

[0004] (2) Some organic repair materials such as polyurethane, fast-hardening epoxy resin, etc., the construction is more complicated, the material has a certain volatility, and is not environmentally friendly; the cured material has poor aging resistance and is expensive

[0005] (3) The crack resistance of the material is not good when it is used for large-scale emergency repairs, and it is easy to crack after construction

[0006] (4) Cannot be used for emergency repair projects under negative temperature