CN108383440B - Full-solid-waste high-strength anti-bending concrete and preparation method thereof - Google Patents

Abstract

The invention relates to a full-solid waste high-strength bending-resistant concrete which comprises a solid waste raw material, a gel material, a plasticizer, a reinforcing agent and an admixture, wherein the solid waste raw material comprises the following components in parts by weight: (1) solid waste raw materials: 60-70% of fly ash, 10-20% of carbide slag and 4-10% of desulfurized gypsum; (2) gel material: 5 to 7 percent of clinker; (3) plasticizer: 1 to 5 percent of polymer; (4) reinforcing agent: 3% -10% of polypropylene fiber; (5) blending materials: 5 percent of superfine zeolite powder; (6) 5 to 7 percent of water. The invention completely adopts industrial solid waste, and the prepared concrete has the characteristics of high strength, high toughness, high bending resistance, high durability and the like, and is an environment-friendly building material with wide application.

Description

Full-solid-waste high-strength anti-bending concrete and preparation method thereof

Technical Field

The invention relates to the field of environment-friendly building materials, in particular to full-solid-waste high-strength anti-bending concrete and a preparation method thereof.

Background

Because the concrete has the characteristics of rich raw materials, low price, simple production process and the like, the concrete becomes one of the most important materials in the field of modern buildings, and the using amount of the concrete is larger and larger. In addition, the high strength, high toughness, high crack resistance, high durability and light weight of concrete are development trends of the requirements of civil engineering and construction fields on the performance of concrete materials in the future. At present, common concrete applied to civil engineering is a quasi-brittle material, and although tensile strength, bending strength and fracture performance of the concrete are improved to a certain extent by adding polymers such as appropriate fibers, the polymers in the concrete have poor long-term aging resistance. The common concrete has the problems of large unit volume mass, heavy weight and the like, and the use of the common concrete is limited in many aspects, so that the loss of manpower and material resources is increased.

With the development of the industry, a large amount of coal is burnt, and the fly ash is used as a solid waste and enters the atmosphere along with the emission of flue gas generated by coal combustion. The fly ash contains a large amount of useful resources such as silicon dioxide, aluminum oxide and the like, and if the fly ash is not collected and properly treated, resource waste and environmental pollution can be caused. Therefore, the comprehensive utilization of the fly ash and the waste recycling become valuable, become an important technical and economic policy in the economic construction of China, and are important means for relieving the environmental pollution pressure and the resource shortage of China. The micro form of the fly ash is a hollow sphere structure, which endows the fly ash with physical characteristics of light weight, low density and the like.

Chinese patent publication No. CN1491917A relates to a preparation method of high-strength lightweight aggregate concrete, which is characterized in that: the method is realized by the following steps: 1) pretreatment of lightweight aggregate: a) preparing a pretreated cement slurry, wherein the pretreated cement slurry consists of cement, an ultrafine admixture, water-soluble polyacrylic acid emulsion, a water reducing agent FDN and water; b) putting the light aggregate into the pretreated cement paste, stirring for 1-3 min, taking out, and curing for 1-3 days at a relative humidity of 90 +/-5% and a temperature of 20 +/-3 ℃ for later use; 2) preparation of lightweight aggregate concrete: the high-strength lightweight aggregate concrete consists of pretreated lightweight aggregate, cement, fine aggregate, silica fume, a water reducing agent FDN and water; and uniformly stirring the mixture according to the proportion to prepare slurry, thus obtaining the product. The method can effectively improve the strength of the light aggregate particles, reduce the water absorption, obviously increase the strength of the light aggregate concrete and improve the pumping construction performance of the light aggregate concrete. The method has long preparation time and complex process, the used superfine admixture needs to be repeatedly ball-milled, the preparation cost is high, the energy consumption is high, and the method is not beneficial to industrial large-scale production.

Chinese patent publication No. CN106145812A relates to an environment-friendly concrete, which is prepared by mixing portland cement, waste sand, quartz sand, waste stone, broken stone, mineral powder, fly ash, carbon fiber, waste rubber powder, triethanolamine, sodium lignosulfonate, naphthalene-based superplasticizer, acrylate emulsion, water, anion powder and modified zeolite according to a certain proportion. The product has good air purifying capacity and high mechanical property, but the utilization rate of the fly ash is relatively low, the process is complex, the fly ash waste cannot be fully utilized, and the product is not produced in large scale in industry.

Chinese patent publication No. CN101367635A relates to a full-solid waste low-grade concrete material prepared from fluidized bed combustion coal solid sulfur ash, which is mainly prepared by mixing fluidized bed combustion coal solid sulfur ash, carbide slag, phosphogypsum, sand and stones according to a certain proportion. The product has low cost, saves land resources, but has low compression resistance, and the raw material phosphogypsum can acidify the land, has low utilization rate and is not suitable for being used in buildings.

In order to overcome the defects, the invention provides the full-solid-waste high-strength bending-resistant concrete, and solves the problems in practical application. The material takes fly ash as a main raw material, the preparation process is simple, the energy consumption is low, and the prepared concrete has the characteristics of high strength, high toughness, high crack resistance, high durability and the like, and is an environment-friendly building material with wide application prospect in the future.

Disclosure of Invention

The invention aims to completely adopt industrial solid wastes to prepare concrete with the characteristics of high strength, high toughness, high bending resistance, high durability and the like, and the concrete is used as an environment-friendly building material with wide application.

In order to realize the purpose of the invention, the technical scheme is as follows:

the utility model provides a complete useless anti concrete that buckles that excels in of solidifying which characterized in that: the material comprises the following raw materials in parts by weight:

(1) solid waste raw materials: 60-70% of fly ash, 10-20% of carbide slag and 4-10% of desulfurized gypsum;

(2) gel material: 5 to 7 percent of clinker;

(3) plasticizer: 1 to 5 percent of polymer;

(4) reinforcing agent: 3% -10% of polypropylene fiber;

(5) blending materials: 5 percent of superfine zeolite powder;

(6) water: 5 to 7 percent.

Further, the mass fraction of silicon dioxide in the fly ash is not less than 20%.

Further, the particle sizes of the fly ash, the carbide slag and the desulfurized gypsum are 200-250 meshes.

Further, the plasticizer polymer is an epoxy resin or an unsaturated polyester.

Further, the plasticizer polymer is a water-soluble polymer having a molecular weight of not less than 600000.

Furthermore, the particle size of the admixture ultrafine zeolite powder is not less than 200 meshes.

The preparation process of the full-solid-waste high-strength anti-bending concrete comprises the following steps:

(1) according to the weight ratio, 60-70% of fly ash, 10-20% of carbide slag, 4-10% of desulfurized gypsum and 5-7% of clinker are uniformly mixed to obtain primary concrete powder;

(2) adding the primary concrete powder obtained in the step (1) into a stirrer, adding 5% of superfine zeolite powder according to the mass ratio, and stirring for 1-30 min;

(3) uniformly mixing 1-5% of polymer and 1-5% of reinforcing agent by using 5-7% of water, adding the mixture into a stirrer, and continuously stirring for 20-40 minutes;

(4) and (3) mixing the materials in the step (1) and the step (2), and performing steam curing in an autoclave, wherein the temperature in the autoclave is set to be 50-200 ℃, the pressure is set to be 1.0-3.0 MPa, and the steam curing time is 3-20 hours, so as to obtain the all-solid-waste high-strength bending-resistant concrete.

The invention has the advantages that the invention completely adopts industrial solid waste as raw materials, avoids environmental pollution, saves land resources and realizes resource reutilization, in particular, the invention comprehensively utilizes the solid waste fly ash discharged by coal burning, the waste residue of acetylene gas produced by calcium carbide hydrolysis, and the industrial byproduct gypsum desulfurized gypsum obtained by industrial enterprises of coal burning or oil after treating sulfur dioxide in flue gas as main raw materials, changes waste into valuables, changes harm into benefit, relieves the environmental pollution pressure of China and effectively promotes the further development of national environmental protection recycling economy. The concrete prepared by the invention has the characteristics of high strength, high toughness, high bending resistance, high durability and the like, and is an environment-friendly building material with wide application.

Detailed Description

The embodiments of the invention are merely to further illustrate and explain the present invention and do not limit the content of the present invention.

Example 1

The full-solid-waste high-strength anti-bending concrete comprises the following raw materials in parts by weight:

(1) solid waste raw materials: 65% of fly ash, 10% of carbide slag and 4% of desulfurized gypsum, wherein the particle sizes of the fly ash, the carbide slag and the desulfurized gypsum are 200 meshes. The mass fraction of silicon dioxide in the fly ash is 15 percent;

(2) gel material: 5% of clinker;

(3) plasticizer: 3% of polyethylene oxide and the molecular weight is 1000000;

(4) reinforcing agent: 3% of polypropylene fiber;

(5) blending materials: 5 percent of superfine zeolite powder;

(6) water: 5 percent.

And (3) steaming and curing in an autoclave at the temperature of 150 ℃ and the pressure of 1.2MPa for 12 hours to obtain the full-solid-waste high-strength bending-resistant concrete.

Example 2

The full-solid-waste high-strength anti-bending concrete comprises the following raw materials in parts by weight:

(1) solid waste raw materials: 68% of fly ash, 15% of carbide slag and 6% of desulfurized gypsum, wherein the particle sizes of the fly ash, the carbide slag and the desulfurized gypsum are 200 meshes. The mass fraction of silicon dioxide in the fly ash is 15 percent;

(2) gel material: 6% of clinker;

(3) plasticizer: 4% of polyethylene oxide and molecular weight of 1000000;

(4) reinforcing agent: 4% of polypropylene fiber;

(5) blending materials: 5 percent of superfine zeolite powder;

(6) water: 6 percent.

And (3) steaming and curing the concrete in an autoclave for 10 hours at the temperature of 160 ℃, the pressure of 1.4MPa and the temperature of 10 hours to obtain the full-solid-waste high-strength bending-resistant concrete.

Example 3

The full-solid-waste high-strength anti-bending concrete comprises the following raw materials in parts by weight:

(1) solid waste raw materials: 70% of fly ash, 20% of carbide slag and 8% of desulfurized gypsum, wherein the particle size of the fly ash, the carbide slag and the desulfurized gypsum is 200 meshes, and the mass fraction of silicon dioxide in the fly ash is 15%;

(2) gel material: 7% of clinker;

(3) plasticizer: 5% of polyethylene oxide and molecular weight of 1000000;

(4) reinforcing agent: 5% of polypropylene fiber;

(5) blending materials: 5 percent of superfine zeolite powder;

(6) water: 7 percent.

And (3) steaming and curing the concrete in an autoclave at the temperature of 180 ℃ and the pressure of 1.6MPa for 8 hours to obtain the full-solid-waste high-strength bending-resistant concrete.

The concrete obtained by testing the concrete prepared in the above facts according to the requirements of (GB/T50081-2002) Standard of the test method for mechanical Properties of general concrete has the following compressive strength and flexural strength (28 d):

	compressive strength (MPa)	Bending strength (MPa)
			Example 1	64.3	7.52
Example 2	65.5	7.56
			Example 3	65.9	7.58

The present invention has been described in relation to the above embodiments, which are only exemplary of the implementation of the present invention. It should be noted that the disclosed embodiments do not limit the scope of the invention. Rather, it is intended that all such modifications and variations be included within the spirit and scope of this invention.

Claims (4)

1. The utility model provides a complete useless anti concrete that buckles that excels in of solidifying which characterized in that: the concrete is prepared from the following raw materials in percentage by weight:

(1) solid waste raw materials: 60-70% of fly ash, 10-20% of carbide slag and 4-10% of desulfurized gypsum;

(2) gel material: 5 to 7 percent of clinker;

(3) plasticizer: 1 to 5 percent of polymer;

(4) reinforcing agent: 3% -10% of polypropylene fiber;

(5) blending materials: 5 percent of superfine zeolite powder;

(6) water: 5% -7%;

the mass fraction of silicon dioxide in the fly ash is not lower than 20%;

the particle sizes of the fly ash, the carbide slag and the desulfurized gypsum are 200-250 meshes;

the polymer is epoxy resin or unsaturated polyester;

the sum of the using amounts of the components meets 100 percent.

2. The full-solid-waste high-strength anti-bending concrete according to claim 1, characterized in that: the polymer is water-soluble polymer, and the molecular weight of the polymer is not less than 600000.

3. The full-solid-waste high-strength anti-bending concrete according to claim 1, characterized in that: the particle size of the admixture ultrafine zeolite powder is not less than 200 meshes.

4. The full-solid-waste high-strength bending-resistant concrete according to claim 1, wherein the preparation process comprises the following steps:

(1) taking the raw materials according to the weight percentage of claim 1 for standby, and uniformly mixing the fly ash, the carbide slag, the desulfurized gypsum and the clinker to obtain primary concrete powder;

(2) adding the primary concrete powder obtained in the step (1) into a stirrer, adding the superfine zeolite powder according to the dosage ratio, and stirring for 1-30 min;

(3) uniformly mixing the polymer and the reinforcing agent according to the weight percentage in the claim 1 by using water, adding the mixture into a stirrer, and continuously stirring for 20-40 min;

(4) and (3) mixing the materials in the step (1) and the step (2), and performing steam curing in an autoclave, wherein the temperature in the autoclave is set to be 50-200 ℃, the pressure is set to be 1.0-3.0 MPa, and the steam curing time is 3-20 hours, so as to obtain the all-solid-waste high-strength bending-resistant concrete.