CN112608089A

CN112608089A - Concrete material applied to civil engineering and preparation method thereof

Info

Publication number: CN112608089A
Application number: CN202110018998.8A
Authority: CN
Inventors: 李庆伟; 何本其; 罗朝贵; 尹光雪
Original assignee: Yibin Shuangsan Commercial Concrete Co ltd
Current assignee: Yibin Shuangsan Commercial Concrete Co ltd
Priority date: 2021-01-07
Filing date: 2021-01-07
Publication date: 2021-04-06

Abstract

The invention discloses a concrete material applied to civil engineering, which comprises the following ingredients: a water reducing agent; the cement is one of portland cement, slag cement and alumina cement, and the cement content is in the range of 500-700 kg/m 3; the coarse aggregate is one of granite, diabase and marble, and the strength index of the coarse aggregate is greater than 2; fine aggregate, wherein the fine aggregate is sand with fineness modulus of 2.8-3.2; and mixing water, wherein the water-cement ratio of the mixing water is within the range of 0.28-0.35. The invention reduces the use of natural primary coarse and fine aggregate, is beneficial to environmental protection, enhances the performance of concrete materials, and plays a role in obtaining good social benefit and economic benefit which cannot be underestimated.

Description

Concrete material applied to civil engineering and preparation method thereof

Technical Field

The invention relates to the technical field of civil engineering, in particular to a concrete material applied to civil engineering and a preparation method thereof.

Background

With the acceleration of urbanization, the demand of society for concrete is rapidly increasing. The coarse and fine aggregate as an important raw material of concrete is obviously insufficient, so that huge amounts of waste concrete are reasonably recycled, the problem that natural primary coarse and fine aggregate is lacked is solved, the treatment cost of the waste concrete is saved, the environmental protection is facilitated, and the effect that good social benefit and economic benefit can not be underestimated is achieved.

Disclosure of Invention

The invention overcomes the defects of the prior art, and provides a concrete material applied to civil engineering and a preparation method thereof, which are used for increasing the material strength, reducing natural primary aggregate and being beneficial to environmental protection.

In view of the above problems of the prior art, according to one aspect of the present disclosure, the following technical solutions are adopted in the present invention:

a concrete material for civil engineering application, comprising:

a water reducing agent;

the cement is one of portland cement, slag cement and alumina cement, and the cement content is in the range of 500-700 kg/m 3;

the coarse aggregate is one of granite, diabase and marble, and the strength index of the coarse aggregate is greater than 2;

fine aggregate, wherein the fine aggregate is sand with fineness modulus of 2.8-3.2;

and mixing water, wherein the water-cement ratio of the mixing water is within the range of 0.28-0.35.

In order to better realize the invention, the further technical scheme is as follows:

according to one embodiment of the invention, a powdered reactive admixture is added to the cement.

According to another embodiment of the invention, the powdered active mixing material is fly ash.

According to another embodiment of the present invention, the coarse aggregate is crushed stone having a cubic shape.

According to another embodiment of the present invention, the coarse aggregate has a particle size of 1 to 1.5 cm.

According to another embodiment of the invention, the pH of the blending water is > 4.

According to another embodiment of the invention, the blending water is magnetized water.

The invention can also be:

a method for preparing a concrete material for civil engineering applications, comprising:

adding a water reducing agent, cement, coarse aggregate and mixing water for stirring by adopting a forced stirrer in two times to prepare mortar;

adding coarse aggregate to prepare a concrete mixture;

and applying a vibration effect to the concrete mixture.

According to one embodiment of the invention, the vibratory action includes vibratory pressing, multi-frequency vibration, centrifugal forming, vacuum water absorption, and polymer impregnation.

Compared with the prior art, the invention has the following beneficial effects:

the concrete material applied to civil engineering and the preparation method thereof reduce the use of natural primary coarse and fine aggregates, are beneficial to environmental protection, enhance the performance of the concrete material and play a role in obtaining good social benefit and economic benefit which cannot be underestimated.

Detailed Description

The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.

A concrete material for civil engineering application, comprising:

the water reducing agent has higher water reducing rate, and can improve the fluidity of concrete when being mixed into the concrete. If the fluidity required by construction is kept unchanged, the water-cement ratio of the concrete mixture can be reduced by reducing the unit water consumption, so that the effects of improving the strength and the compactness are achieved.

The cement, which is one of portland cement, slag cement and alumina cement, is used to produce high-strength concrete, and the amount of the cementitious substance is critical, and it directly affects the binding force of the set cement to the interface. The cement content is in the range of 500-700 kg/m3, the cement dosage is not suitable to exceed the amount, the cement content is too high, and the problems of too fast heat dissipation or too large shrinkage during hydration are easily caused. On the premise of meeting the requirements, the use amount of cement is reduced as much as possible, a part of high-quality fly ash or other powdery active mixing materials can be added, and the side effects of heat release and drying shrinkage are reduced to the minimum.

The concrete structure comprises coarse aggregate, wherein the coarse aggregate plays a main skeleton role in the concrete structure, and the influence of the coarse aggregate on the concrete strength mainly depends on the following factors: the bonding force of the cement paste and the aggregate; the elastic properties of the aggregate; the condition of 'internal layering' formed below the aggregate when the concrete is mixed with water and rises; the degree of stress concentration around the aggregate, and the like. Important preferred properties of coarse aggregate for high strength concrete are: compressive strength, surface characteristics, maximum particle size, and the like. The coarse aggregate is one of granite, diabase and marble, and the strength index of the coarse aggregate is more than 2; the coarse aggregate is made of cubic gravel instead of natural gravel. Meanwhile, the surface of the coarse aggregate must be clean and free of dust, or the internal cohesive force of the concrete will be affected. As the maximum particle size of the coarse aggregate has a certain relation with the maximum compressive strength of the prepared concrete, the maximum strength can be obtained by adopting the aggregate with the particle size of 1-1.5 cm.

The fine aggregate is sand with the fineness modulus of 2.8-3.2, and the sand content is reduced as much as possible, so that the concrete can be prevented from being too dry and hard, and the field pouring is facilitated.

The water-cement ratio of the mixing water is within the range of 0.28-0.35, the pH value of the mixing water is preferably greater than 4, the mixing water is preferably magnetized water, and the strength of the concrete can be improved by 30-50%.

In another embodiment, a method of preparing a concrete material for civil engineering application, includes:

adding a water reducing agent, cement, coarse aggregate and mixing water for stirring by adopting a forced stirrer in two times to prepare mortar; adding coarse aggregate to prepare a concrete mixture; and applying a vibration effect to the concrete mixture. The purpose of concrete mixing is to achieve not only uniform mixing but also reinforcement and plasticization. Different feeding sequences and stirring modes have great influence on the uniformity of the concrete mixture. One of the important technological measures for preparing high-strength concrete is to mix dry and hard concrete by adopting a forced mixer and a twice feeding process. The two-time feeding method is characterized in that mortar is prepared by stirring in advance, and then coarse aggregate is added to prepare a concrete mixture. When the feeding method is adopted, the mortar has no coarse aggregate, and is convenient to stir uniformly; after the coarse aggregate is put into the mortar, the mortar is easy to uniformly wrap the mortar, and the concrete strength is favorably improved.

When a vibration is applied to the concrete mixture, the aggregate and cement particles are accelerated, and the values and directions thereof are changed. The proper vibration can reduce the viscosity of the mixture, so that the concrete is more compact. The concrete strength can be improved by adopting measures such as vibration pressurization, multi-frequency vibration, centrifugal molding or vacuum water absorption, polymerization impregnation and the like.

The invention reduces the use of natural primary coarse and fine aggregate, is beneficial to environmental protection, enhances the performance of concrete materials, and plays a role in obtaining good social benefit and economic benefit which cannot be underestimated.

The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

Reference throughout this specification to "one embodiment," "another embodiment," "an embodiment," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment described generally in this application. The appearances of the same phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the scope of the invention to effect such feature, structure, or characteristic in connection with other embodiments.

Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure and claims of this application. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.

Claims

1. A concrete material for civil engineering application, characterized in that the ingredients comprise:

a water reducing agent;

2. The concrete material for civil engineering application as claimed in claim 1, wherein a powdery active admixture is added to the cement.

3. The concrete material for civil engineering application as claimed in claim 2, wherein the powdery active material is fly ash.

4. The concrete material for civil engineering application as claimed in claim 1, wherein the coarse aggregate is a crushed stone having a cubic shape.

5. The concrete material for civil engineering application as claimed in claim 4, wherein the coarse aggregate has a particle diameter of 1 to 1.5 cm.

6. Concrete material for use in civil engineering works according to claim 1, characterised in that the pH of the water for mixing is > 4.

7. The concrete material for civil engineering application according to claim 1, wherein the mixing water is magnetized water.

8. A method for preparing a concrete material for civil engineering application as claimed in claim 1, characterized by comprising:

adding coarse aggregate to prepare a concrete mixture;

and applying a vibration effect to the concrete mixture.

9. The method for producing a concrete material for civil engineering application according to claim 8, characterized in that the vibrating action includes vibratory pressing, multi-frequency vibration, centrifugal molding, vacuum water absorption and polymerization impregnation.