CN110092627B

CN110092627B - Dry material concrete and preparation method thereof

Info

Publication number: CN110092627B
Application number: CN201910447253.6A
Authority: CN
Inventors: 周苏理
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-05-27
Filing date: 2019-05-27
Publication date: 2020-12-25
Anticipated expiration: 2039-05-27
Also published as: CN110092627A

Abstract

The embodiment of the invention discloses dry material concrete which comprises the following components in parts by weight: 460 parts of cement, 800 parts of coarse aggregate, 1550 parts of fine aggregate, 700 parts of heavy calcium powder, 6-40 parts of silica fume and 2-15 parts of water reducer. The dry material concrete is used for solving the problems that the existing concrete is inconvenient to transport and use, and the time and distance from the transportation and the stirring to the pouring at a construction site are limited. The dry material concrete has long storage period, is convenient to store and transport, has simple and convenient site construction process and wide condition requirement range, thereby meeting the different site and process requirements of various industries on concrete and greatly widening the application range of the concrete. The embodiment of the invention also provides a preparation method of the dry material concrete.

Description

Dry material concrete and preparation method thereof

Technical Field

The invention relates to the technical field of building materials, in particular to dry material concrete and a preparation method thereof.

Background

Concrete is also called concrete, and refers to a general name of engineering composite materials formed by cementing aggregate into a whole by cementing materials. The concrete is usually cement as cementing material and sand and stone as aggregate; the cement concrete, also called as common concrete, is obtained by mixing with water (which may contain additives and admixtures) according to a certain proportion and stirring, and is widely applied to civil engineering.

The concrete has the characteristics of rich raw materials, low price and simple production process, so that the consumption of the concrete is increased more and more. Meanwhile, the concrete also has the characteristics of high compressive strength, good durability, wide strength grade range and the like. These characteristics make it widely used not only in various civil engineering but also in shipbuilding, machinery, ocean development, geothermal engineering and other fields, and concrete is an important material.

In the use process of the existing concrete, a wet material type mixer truck is generally adopted to convey the ready-mixed concrete, and then the concrete is continuously mixed in the transportation process so as to prevent the concrete from being coagulated and separated. The wet material type stirring truck has large occupied area and is inconvenient to move and transport; furthermore, wet concrete cannot last longer than 1.5 hours from transport mixing to site placement, and if it is transported over long distances, it cannot be used in this form of delivery and ready-mixed concrete. The application range and the use condition of the existing concrete are limited, and the concrete can not meet the increasing requirements of the concrete applied in the building engineering and other various industries.

Thus, there is a need for improved innovations in concrete and its preparation process.

Disclosure of Invention

The embodiment of the invention aims to provide dry material concrete, which is used for solving the problems that the existing concrete is inconvenient to transport and use, and the time and distance from transportation and stirring to pouring at a construction site are limited. The dry material concrete has long storage period, is convenient to store and transport, has simple and convenient site construction process and wide condition requirement range, thereby meeting the different site and process requirements of various industries on concrete and greatly widening the application range of the concrete. The embodiment of the invention also provides a preparation method of the dry material concrete.

In order to achieve the above object, an aspect of the embodiments of the present invention provides a dry concrete, which includes the following components in parts by weight: 460 parts of cement, 800 parts of coarse aggregate, 1550 parts of fine aggregate, 700 parts of heavy calcium powder, 6-40 parts of silica fume and 2-15 parts of water reducer.

Further, the dry material concrete comprises the following components in parts by weight: 430 parts of cement 370-containing materials, 1350 parts of coarse aggregate 1150-containing materials, 590 parts of fine aggregate 530-containing materials, 10-20 parts of heavy calcium powder, 15-25 parts of silica fume and 5-10 parts of water reducing agent.

The cement is the conventional cement used for concrete, and includes but is not limited to portland cement, sulphoaluminate cement, phosphate cement, fluoroaluminate cement, pozzolan cement, lime fly ash cement and the like.

In one embodiment, the cement is formed by mixing Portland cement and sulphoaluminate cement in a weight ratio of (10-15):1, preferably 12: 1. Preferably, the portland cement is 52.5-grade ordinary portland cement.

Further, the coarse aggregate comprises crushed stones and pebbles, and the particle size of the crushed stones and the pebbles is 2-40mm, preferably 5-15 mm. The broken stone is made by mechanically crushing and screening natural rock, pebble or mine waste stone; the pebbles are formed by natural weathering, water flow transportation, sorting and stacking. The coarse aggregate plays a skeleton role in concrete.

In one embodiment, the coarse aggregate is formed by mixing crushed stone and pebbles in a weight ratio of (1-3): 1.

Further, the fine aggregate comprises river sand and machine-made sand, and the particle size is 1-8mm, preferably 1-4 mm; the fineness modulus of the river sand is 2.3-2.8, and the fineness modulus of the machine-made sand is 2.5-2.7. A fine aggregate is a granular loose material with a relatively small diameter, which acts as a framework or filling in concrete.

In one embodiment, the fine aggregate is formed by mixing river sand and machine-made sand according to the weight ratio of (3-5):1, and the water content of the fine aggregate is not more than 3%.

The heavy calcium powder is heavy calcium carbonate, and the main component is CaCO₃The fineness is required to be higher than 350 meshes, so that the toughness and strength of the product can be improved; the silica fume is silica micropowder with the average grain diameter of 0.1-0.3 mu m, so that the product has good mechanical property and high-temperature-resistant and oxidation-resistant properties, and the compression resistance, fracture resistance, permeability resistance, corrosion resistance, impact resistance and wear resistance of the concrete are obviously improved.

Further, the water reducing agent is a polycarboxylic acid high-performance water reducing agent in a powder form. Preferably, the water reducing agent is a slow-release polycarboxylic acid water reducing agent and is prepared by polymerizing polyethylene glycol diacrylate, hydroxyethyl acrylate and methacrylic acid serving as unsaturated monomers.

Another aspect of an embodiment of the present invention also provides a method for preparing the dry concrete, including the steps of:

(1) weighing coarse aggregate and fine aggregate according to the weight ratio, and uniformly mixing the coarse aggregate and the fine aggregate to obtain an aggregate mixture;

(2) sequentially adding coarse whiting powder, silica fume and a water reducing agent into cement, and uniformly mixing to obtain a powder mixture;

(3) and adding the powder mixture into the aggregate mixture, stirring while adding, and uniformly mixing to obtain the dry material concrete.

Further, the method further comprises:

(4) and (4) packaging the dry material concrete obtained in the step (3) by using a water-soluble packaging bag according to the specification of 1-50 kg/bag. For example, 1 kg/bag, 5 kg/bag, 10 kg/bag, 25 kg/bag, 50 kg/bag, etc.

The soluble packaging bag is formed by compounding multiple layers of plastic films with different properties, can be of a (from outside to inside) OPP/VMCPP two-layer structure, a PET/AL/CPP three-layer structure and a PET/AL/NY/CPP four-layer structure, is made of a water electrolyte matrix, and can be dissolved in water. Thereby, the dry concrete is convenient to store and use separately.

The application method of the dry material concrete provided by the embodiment of the invention comprises the following steps: adding 12-20 parts by weight of water into every 100 parts by weight of dry material concrete, and uniformly mixing, wherein the concrete can be used like the conventional common concrete. The amount of water added can be adjusted according to the type of cement used and the actual construction requirements, which will be apparent to those skilled in the art and will not be described in detail herein.

The novel dry material concrete provided by the embodiment of the invention can effectively solve the defect that the existing concrete can not be solidified for a short time, greatly improves the storage period, and can be directly opened and mixed for use after being stored for two, three or four months. And the water-soluble independent small package is convenient to store, transport and use.

The dry concrete is suitable for projects such as general construction sites, roads, bridges and the like, can be used as a dry material to package and transport each component to a destination according to the proportion, and then water is added for mixing, and can also be transported by a semi-dry type mixer truck according to the length of the transportation distance, and the semi-dry type mixer truck also mixes the dry concrete with water according to different construction types according to the proportion. The mixing and stirring may be performed after the vehicle arrives at the destination, or the stirring may be performed while the vehicle is running on a mixer truck.

The embodiment of the invention has the following advantages:

1. the dry material concrete has the advantages of easily obtained components, low cost, high strength and good concrete performance and use effect.

2. The storage period is long, and the storage and transportation are convenient, so that the requirements of various industries on different construction sites and different processes of the concrete are met, and the application range of the concrete is greatly widened.

3. The components can be packaged and conveyed to a destination according to the proportion as dry materials and then mixed with water, and the components can also be conveyed by adopting a semi-dry material type stirring vehicle according to the length of the conveying distance, so that the semi-dry material type stirring vehicle is suitable for various construction site requirements.

Detailed Description

The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

The dry concrete in the embodiment comprises the following components in parts by weight: 398 parts of cement (comprising 363 parts of 52.5-grade ordinary portland cement and 35 parts of sulphoaluminate cement), 1261 parts of coarse aggregate (comprising 645 parts of broken stone and 616 parts of pebbles), 566 parts of fine aggregate (comprising 452 parts of river sand and 114 parts of machine-made sand), 14 parts of heavy calcium powder, 20 parts of silica fume and 6 parts of slow-release polycarboxylic acid water reducer.

The preparation method comprises the following steps:

Example 2

The dry concrete in the embodiment comprises the following components in parts by weight: 408 parts of 52.5-grade ordinary portland cement, 1295 parts of coarse aggregate (comprising 689 parts of broken stone and 606 parts of pebble), 570 parts of fine aggregate (comprising 449 parts of river sand and 121 parts of machine-made sand), 16 parts of heavy calcium powder, 22 parts of silica fume and 8 parts of slow-release polycarboxylic acid water reducer.

The preparation method is the same as that of example 1.

Example 3

The dry concrete in the embodiment comprises the following components in parts by weight: 403 parts of cement (comprising 372 parts of 52.5-grade ordinary portland cement and 31 parts of sulphoaluminate cement), 1221 parts of coarse aggregate (comprising 915 parts of crushed stone and 306 parts of pebble), 553 parts of fine aggregate (comprising 460 parts of river sand and 93 parts of machine-made sand), 13 parts of heavy calcium powder, 18 parts of silica fume and 5 parts of slow-release polycarboxylic acid water reducer.

The preparation method is the same as that of example 1.

Example 4

The dry concrete in this example had the same composition and content as in example 1. The preparation method is based on the preparation method of the embodiment 1, and further comprises the following steps:

(4) and (4) packaging the dry material concrete obtained in the step (3) by using a water-soluble packaging bag according to the specification of 1 kg/bag.

The dry concrete obtained by the embodiment of the invention adopts advanced process technology, realizes specialized production management and has accurate measurement. The dry material mixture which is well matched can be packaged in different capacities according to different construction types, and then can be efficiently transported to each construction site, so that the occupied space is reduced, the dry material mixture can be stored for a long time, cannot deteriorate, has a high utilization rate and can be stored for the next time without using.

The concrete can be used as a dry material to package and convey all components to a destination according to the proportion, and then water is added for mixing, or a semi-dry material type mixer truck can be adopted to convey the components according to the length of the conveying distance, and the semi-dry material type mixer truck can also mix dry concrete and water according to the proportion according to different construction types. The mixing and stirring may be performed after the vehicle arrives at the destination, or the stirring may be performed while the vehicle is running on a mixer truck. The product has good quality, less material consumption, high work efficiency and lower cost, and can improve the working conditions and reduce the environmental pollution.

Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims

1. The dry concrete is characterized by comprising the following components in parts by weight: 430 parts of cement 370-containing material, 1350 parts of coarse aggregate 1150-containing material, 590 parts of fine aggregate 530-containing material, 10-20 parts of heavy calcium powder, 15-25 parts of silica fume and 5-10 parts of water reducing agent;

wherein the cement is formed by mixing Portland cement and sulphoaluminate cement according to the weight ratio of (10-15) to 1;

the coarse aggregate is formed by mixing broken stones and pebbles according to the weight ratio (1-3) to 1; and is

The fine aggregate is formed by mixing river sand and machine-made sand according to the weight ratio of (3-5) to 1, and the water content of the fine aggregate is not more than 3%.

2. The dry concrete according to claim 1, wherein the coarse aggregate has a particle size of 2 to 40 mm.

3. The dry concrete according to claim 1, wherein the fine aggregate has a particle size of 1 to 8 mm; the fineness modulus of the river sand is 2.3-2.8, and the fineness modulus of the machine-made sand is 2.5-2.7.

4. The dry concrete according to claim 1, wherein the water reducing agent is a polycarboxylic acid-based high-performance water reducing agent in powder form.

5. A method for the preparation of dry concrete according to any one of claims 1 to 4, characterized in that it comprises the following steps:

6. The method of claim 5, further comprising:

(4) and (4) packaging the dry material concrete obtained in the step (3) by using a water-soluble packaging bag according to the specification of 1-50 kg/bag.