CN108947305B

CN108947305B - Existing concrete reinforcing agent

Info

Publication number: CN108947305B
Application number: CN201810975926.0A
Authority: CN
Inventors: 李晓峰; 贾迎泽; 郭幸福; 裴林昊; 乔斌; 宋炜; 高世孝; 梁彦平; 任梅香
Original assignee: Linfen Huaji Building Materials Technology Co ltd
Current assignee: Linfen Huaji Building Materials Technology Co ltd
Priority date: 2018-08-24
Filing date: 2018-08-24
Publication date: 2020-09-22
Anticipated expiration: 2038-08-24
Also published as: CN108947305A

Abstract

The invention relates to the technical field of building materials, in particular to a reinforcing agent for enhancing the strength by the secondary hydration of the existing concrete; the invention aims to solve the problem of providing an existing concrete reinforcing agent, saturated lime water is brought into concrete by a penetration, strength promotion and moisture preservation method, and the concrete is subjected to secondary hydration under the condition of ensuring the humidity so as to achieve the aim of improving the strength, wherein the adopted technical scheme is as follows: the raw materials are as follows by weight: 55-200 parts of saturated limewater, 0.1-2 parts of diethylene glycol, 0.1-1.5 parts of triethanolamine, 0.05-2 parts of sodium gluconate and 0.1-2.5 parts of a water reducing agent.

Description

Existing concrete reinforcing agent

Technical Field

The invention relates to the technical field of building materials, in particular to a reinforcing agent for enhancing the strength by secondary hydration of existing concrete.

Background

Along with the progress of modern society of China, concrete as a main material for city, traffic, water conservancy and agricultural construction is more and more generally accepted by society, the using amount of the concrete is huge, the using amount of concrete admixture in 2016 China is about 200 hundred million tons, the using amount of the concrete is 20000 hundred million square, the using amount of the concrete becomes the first world, but the problems of great climate change, uneven quality of gravel aggregate and cement and more frequent construction level exist in China, the following concrete quality problems have to be worried, especially the engineering quality problems of great early and late temperature difference, more wind and sand weather, difficult winter maintenance and the like in northern areas of China are serious, engineering quality problems of early cracking, low strength and the like of the concrete generated by the problems are more confusing, and the strength of the concrete basically cannot meet the design requirements even if a remedial method is adopted in the later period, the safety of the concrete structure can be ensured only by adopting various reinforcement means, which is not only labor-consuming and troublesome, but also difficult to fundamentally solve the difficult problem of concrete durability caused by insufficient concrete strength.

The early concrete stage causes the weakening or stopping of cement hydration due to low temperature or the loss of liquid phase in the concrete and causes the shrinkage and cracking of the concrete, so the maintenance measures for strengthening the early concrete stage for heat preservation and moisture preservation are indispensable, but the problem of strength reduction of some vertical components and thin components due to the difficulty of maintenance and the easiness of being influenced by the environment is inevitably serious. It is inevitable to find a concrete reinforcing agent which can promote the secondary hydration of the existing concrete and improve the compressive strength.

Disclosure of Invention

The technical problem to be solved by the invention is to provide an existing concrete reinforcing agent, saturated lime water is brought into concrete by a penetration, strength promotion and moisture preservation method, and the concrete is subjected to secondary hydration under the condition of ensuring the humidity, so that the aim of improving the strength is fulfilled.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the existing concrete reinforcing agent comprises the following raw materials in parts by weight: 55-200 parts of saturated limewater, 0.1-2 parts of diethylene glycol, 0.1-1.5 parts of triethanolamine, 0.05-2 parts of sodium gluconate and 0.1-2.5 parts of a water reducing agent.

The raw materials are as follows by weight: 80-150 parts of saturated limewater, 0.1-1 part of diglycol, 0.1-1 part of triethanolamine, 0.1-2 parts of sodium gluconate and 0.1-2 parts of water reducing agent.

The water reducing agent is polycarboxylate.

The water reducing agent is an aqueous solution of allyl polyoxyethylene ether, and the concentration is 80-90 wt%.

The technical scheme of the invention is utilized to carry out the following experiments: diethylene glycol, triethanolamine, sodium gluconate and a water reducing agent are added into saturated limewater to be uniformly mixed and placed for 48 hours at room temperature for standby.

The thickness of the test wall is 200mm, and the area is 40m²The preparation proportion of the C35 concrete is 270kg,90kg of mineral powder, 50kg of fly ash, 1180kg of sand at any time, 690kg of sand, 8.2kg of additive and 175kg of water. Pumping C35 for layered pouring, vibrating by a vibrating rod, pouring at the temperature of 11-19 ℃, continuously brushing the reinforcing agent of the invention, continuously brushing in the first 7 days to ensure that the wall surface is wet, continuously brushing in the daytime, covering a plastic film at night for water retention and maintenance, finding out that the initial test wall has large water absorption, the brushing interval time is 10 minutes, the later water absorption is gradually reduced, and 30 days of core drilling sampling is carried out, wherein the brushing times are basically kept at 15 times per day, the diameter of a core sample is 100mm, and the core sample is cut, dried and leveled by sulfur cement before detection, and the detection test data is as follows:

the test data show that the effect is obvious after the reinforcing agent is coated, the strength is gradually improved along with the extension of the coating time, the early strength increasing speed is higher than that of the later stage, the early reinforcing agent begins to hydrate on the surface of the concrete and gradually enters the interior of the concrete, the impermeability grade of C35 is P6, the difficulty is higher and higher when the reinforcing agent enters the interior of the concrete, strong calcium oxide which can promote the hydration of the concrete in the interior of the concrete is reduced, and the reinforcing effect is slower and slower, so that the early coating is necessary, and the reinforcing and curing time of the concrete can be prolonged if the conditions allow. Compared with the result of untreated concrete, the result of raising at 85 ℃ for 72h shows that the capability of the reinforcing agent diffusing into the concrete at high temperature is obviously enhanced, the reinforcing agent completely enters into the concrete after 72h, the hydration of the concrete at high temperature is further enhanced in a humid environment, and the reinforcing effect reaches the best state.

As described above, the present invention has the following beneficial effects compared with the prior art: the invention solves the problem of low strength caused by improper early maintenance of the concrete, can effectively improve the strength of the existing concrete through secondary hydration, is convenient to construct, saves energy and protects the environment, not only ensures the strength of the concrete, but also improves the durability of the concrete.

The application principle of the invention is that the intensifier takes saturated lime water as a main medium, the saturated lime water is brought into the concrete by adding a diffusion penetrant, the intensifier accelerates hydration by N bonds on molecules of the intensifier, sodium gluconate is mainly used as a concrete humectant to adsorb water in the air to increase the surface humidity of the concrete, and a polycarboxylate water reducer is mainly matched with the diffusion penetrant to enable the cement to generate hydration reaction with the least water consumption. The effect of the reinforcing agent is more obvious along with the rise of the temperature, and concrete should be continuously maintained in order to ensure the hydration continuity of the cement.

Detailed Description

The invention is illustrated by the following examples.

100 parts of saturated limewater, 0.5 part of diglycol, 0.5 part of triethanolamine, 0.15 part of sodium gluconate and 0.3 part of water reducing agent.

Example 1

The existing concrete reinforcing agent comprises the following raw materials in parts by weight: 55 parts of saturated limewater, 0.1 part of diglycol, 0.1 part of triethanolamine, 0.05 part of sodium gluconate and 0.1 part of polycarboxylate.

Example 2

The existing concrete reinforcing agent comprises the following raw materials in parts by weight: 200 parts of saturated limewater, 2 parts of diethylene glycol, 1.5 parts of triethanolamine, 2 parts of sodium gluconate and 2.5 parts of allyl polyoxyethylene ether with the concentration of 80-90 wt%.

Example 3

The existing concrete reinforcing agent comprises the following raw materials in parts by weight: 150 parts of saturated limewater, 1 part of diethylene glycol, 1 part of triethanolamine, 2 parts of sodium gluconate and 2 parts of allyl polyoxyethylene ether with the concentration of 80-90 wt%.

Example 4

The existing concrete reinforcing agent comprises the following raw materials in parts by weight: 80 parts of saturated limewater, 0.1 part of diglycol, 0.1 part of triethanolamine, 0.1 part of sodium gluconate and 0.1 part of allyl polyoxyethylene ether with the concentration of 80-90 wt%.

Example 5

The existing concrete reinforcing agent comprises the following raw materials in parts by weight: 110 parts of saturated limewater, 0.6 part of diglycol, 0.4 part of triethanolamine, 0.12 part of sodium gluconate and 0.5 part of allyl polyoxyethylene ether with the concentration of 80-90 wt%.

The above embodiments are merely illustrative of the principles of the present invention and its effects, and do not limit the present invention. It will be apparent to those skilled in the art that modifications and improvements can be made to the above-described embodiments without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications or changes be made by those skilled in the art without departing from the spirit and technical spirit of the present invention, and be covered by the claims of the present invention.

Claims

1. An existing concrete reinforcing agent is characterized in that: the raw materials are as follows by weight: 55-200 parts of saturated limewater, 0.1-2 parts of diethylene glycol, 0.1-1.5 parts of triethanolamine, 0.05-2 parts of sodium gluconate and 0.1-2.5 parts of a water reducing agent.

2. An existing concrete reinforcing agent is characterized in that: the raw materials are as follows by weight: 80-150 parts of saturated limewater, 0.1-1 part of diglycol, 0.1-1 part of triethanolamine, 0.1-2 parts of sodium gluconate and 0.1-2 parts of water reducing agent.

3. An existing concrete enhancer according to claim 1, wherein: the water reducing agent is polycarboxylate.