阅读说明：本技术 一种抗裂增强型水泥及其制备方法 (Anti-cracking reinforced cement and preparation method thereof ) 是由 刘品 于 2019-11-18 设计创作，主要内容包括：本发明公开了一种抗裂增强型水泥及其制备方法,该抗裂增强型水泥利用耐碱性玻璃纤维作为原料,通过间苯新戊二醇型不饱和聚酯树脂、脱氢乙酸、1-3丙二醇在硅烷偶联剂KH570中进行改性,得到的改性耐碱性玻璃纤维作为原料与短切碳纤维以及硅微粉混合后与水泥熟料、矿渣、粉煤灰、氟石膏、石英砂以及相关助剂混合后制备；其制备时先将水泥熟料、矿渣、粉煤灰、氟石膏、石英砂混合后煅烧,然后将煅烧后的半成品水泥放入搅拌桶中与水、增强材料以及助剂一同进行高速搅拌混合后热风干燥、再粉碎至粉末状,得到成品水泥。本发明制备的水泥强度高、稳定性好,并能在相同条件下有效抵御裂缝产生和发展,延长水泥砌筑结构的使用寿命。(The invention discloses anti-cracking enhanced cement and a preparation method thereof, the anti-cracking enhanced cement utilizes alkali-resistant glass fiber as a raw material, m-phenyl neopentyl glycol type unsaturated polyester resin, dehydroacetic acid and 1-3 propylene glycol are modified in a silane coupling agent KH570, and the obtained modified alkali-resistant glass fiber is prepared by mixing the raw material with chopped carbon fiber and silicon micro powder and then mixing the mixture with cement clinker, slag, fly ash, fluorgypsum, quartz sand and related auxiliary agents; the preparation method comprises the steps of mixing cement clinker, slag, fly ash, fluorgypsum and quartz sand, calcining, putting the calcined semi-finished cement into a stirring barrel, stirring and mixing the mixture with water, a reinforcing material and an auxiliary agent at a high speed, drying the mixture by hot air, and crushing the dried mixture into powder to obtain the finished cement. The cement prepared by the method has high strength and good stability, can effectively resist the generation and development of cracks under the same condition, and prolongs the service life of a cement masonry structure.)

1. The anti-cracking reinforced cement is characterized by comprising the following raw materials in parts by mass:

60 ~ 80 portions of cement clinker

25 parts of slag 25 ~ 35

20 ~ 30 parts of fly ash

10 ~ 15 parts of fluorgypsum

10 ~ 15 parts of quartz sand

Reinforcing material 5 ~ 8 parts

0.8 part of assistant 0.8 ~ 3

The reinforcing material is a mixture of modified alkali-resistant glass fibers, chopped carbon fibers and silica powder in a proportion, the volume ratio of the modified alkali-resistant glass fibers to the chopped carbon fibers in the mixture is 10:1 ~ 15:1, the addition amount of the silica powder is 8% to ~ 10% of the mass of the reinforcing material, the modification mode of the modified alkali-resistant glass fibers is that the alkali-resistant glass fibers, m-benzene neopentyl glycol type unsaturated polyester resin, dehydroacetic acid and 1-3 propylene glycol are uniformly mixed according to the proportion of 60:5:5:1, then the mixture is kept stand for 30 ~ 40min, then the mixture is added into a silane coupling agent KH570 together, mixed and stirred for 60 ~ 90min, and then the mixture is dried by hot air to obtain the alkali-resistant glass fibers after modification treatment.

2. The crack-resistant reinforced cement according to claim 1, wherein the alkali-resistant glass fiber raw material used in the modified alkali-resistant glass fiber is preferably ZrO₂Is 12.5wt% ~ 14wt% of alkali-resistant glass fiber.

3. The crack-resistant enhanced cement according to claim 1, wherein the cement clinker is a low-alkalinity sulphoaluminate cement.

4. The anti-cracking enhanced cement according to claim 1, wherein the cement clinker is a mixture cement clinker prepared from low-alkalinity sulphoaluminate cement and magnesium phosphate cement in a mass ratio of 6:1 ~ 8: 1.

5. The crack-resistant reinforced cement according to claim 1, wherein the quartz sand is a quartz sand with a modulus of 2.4-2.8.

6. The crack-resistant reinforced cement as claimed in claim 1, wherein the auxiliary agent comprises 30 ~ 40% of cellulose ether, 0 ~ 30% of defoamer, 0 ~ 30% of water reducing agent, 15 ~ 20% of aluminum hydroxide, 5 ~ 15% of water repellent and 10 ~ 15% of magnesium carbonate.

7. The crack-resistant enhanced cement according to claim 6, wherein the cellulose ether is one of ethyl methyl cellulose, hydroxypropyl methyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose.

8. The crack-resistant enhanced cement according to claim 6, wherein the defoamer is a polyether defoamer.

9. The crack-resistant enhanced cement according to claim 6, wherein the water repellent is a sodium methyl silicate water repellent.

10. A method for preparing anti-cracking reinforced cement, which is characterized in that the anti-cracking reinforced cement is prepared by using the raw material of the glass fiber composite cement as claimed in any one of the claims 1 ~ 8, and the production flow comprises the following steps:

s1, mixing and crushing the cement clinker, the slag, the fly ash, the fluorgypsum and the quartz sand in parts by weight, and calcining the mixture for 3 ~ 5 hours at the temperature of 900 ~ 1100 ℃ to obtain semi-finished cement;

s2, placing the semi-finished cement into a stirring barrel, adding water, a reinforcing material and an auxiliary agent, stirring at a high speed of 800-1000 rpm for 30-45 min, drying the stirred mixture for 20-30 min by hot air at the temperature of 110-130 ℃, and crushing into powder to obtain the finished cement.

Technical Field

The invention relates to the technical field of cement preparation processes, in particular to anti-cracking reinforced cement and a preparation method thereof.

Background

As one of three basic materials in the building industry, cement is the most used building material, has wide application and large using amount, is used as a powdery hydraulic inorganic cementing material, is usually mortar or concrete prepared by adding water and stirring, and is widely applied to construction engineering, traffic engineering, offshore platforms and other infrastructure engineering. However, the common concrete has the defects of high brittleness, low compressive strength, cement hydration accompanied with volume shrinkage and the like, and the concrete is very likely to have cracks, a freeze-thaw effect, chlorine-sulfur corrosion or other types of corrosion and the like, so that the strength and the service performance of the concrete are obviously reduced.

In the existing cement production process, limestone and clay are generally used as main raw materials, are crushed, proportioned and ground into raw materials, are fed into a cement kiln to be calcined into clinker, and are added with a proper amount of gypsum to be ground into the cement; and along with the increase of the age of the concrete material in the use process, the structure of the concrete structure can be damaged in different degrees under the action of various external factors, so that the integrity and the stability of the structure are influenced, a large number of cracks which are generated from outside to inside on the concrete structure surface need to be repaired, particularly, under the influence of environmental factors, the concrete structure is easy to have the problems of cracks, denudation, holes and the like, if the cracks cannot be timely treated, the damage to the structure can be aggravated, and therefore, the stability of the structure is influenced, and the safety performance of the whole structure is influenced.

Disclosure of Invention

The invention aims to provide anti-cracking reinforced cement and a preparation method thereof, the cement is reinforced by a treated reinforcing material, has the advantages of low production cost, high strength, alkali resistance, anti-cracking performance and durability, and can be used for solving the technical defects in the prior art.

The technical problem solved by the invention is realized by adopting the following technical scheme:

the anti-cracking reinforced cement comprises the following raw materials in parts by mass:

60 ~ 80 portions of cement clinker

25 parts of slag 25 ~ 35

20 ~ 30 parts of fly ash

10 ~ 15 parts of fluorgypsum

10 ~ 15 parts of quartz sand

Reinforcing material 5 ~ 8 parts

0.8 part of assistant 0.8 ~ 3

The reinforcing material is a mixture of modified alkali-resistant glass fibers, chopped carbon fibers and silica powder in a proportion, the volume ratio of the modified alkali-resistant glass fibers to the chopped carbon fibers in the mixture is 10:1 ~ 15:1, the addition amount of the silica powder is 8% to ~ 10% of the mass of the reinforcing material, the modification mode of the modified alkali-resistant glass fibers is that the alkali-resistant glass fibers, m-benzene neopentyl glycol type unsaturated polyester resin, dehydroacetic acid and 1-3 propylene glycol are uniformly mixed according to the proportion of 60:5:5:1, then the mixture is kept stand for 30 ~ 40min, then the mixture is added into a silane coupling agent KH570 together, mixed and stirred for 60 ~ 90min, and then the mixture is dried by hot air to obtain the alkali-resistant glass fibers after modification treatment.

As a further limitation, ZrO is preferably used as the alkali-resistant glass fiber raw material used for the modified alkali-resistant glass fiber₂Is 12.5wt% ~ 14wt% of alkali-resistant glass fiber.

By way of further limitation, the cement clinker is low-alkalinity sulphoaluminate cement or a mixture cement clinker prepared by mixing low-alkalinity sulphoaluminate cement and magnesium phosphate cement according to the mass ratio of 6:1 ~ 8: 1.

The quartz sand is further limited to be quartz sand with a modulus of 2.4-2.8.

The auxiliary agent comprises 30 ~% of cellulose ether, 0 ~% of defoaming agent, 0 ~% of water reducing agent, 15 ~% of aluminum hydroxide, 5 ~% of water repellent and 10 ~% of magnesium carbonate, wherein the cellulose ether is one of ethyl methyl cellulose, hydroxypropyl methyl cellulose, carboxymethyl cellulose and hydroxyethyl cellulose, the defoaming agent is polyether defoaming agent, the defoaming agent is organic siloxane, and the water repellent is sodium methyl silicate water repellent.

The preparation method of the anti-cracking reinforced cement mainly comprises the following production processes:

s1, mixing and crushing the cement clinker, the slag, the fly ash, the fluorgypsum and the quartz sand in parts by weight, and calcining the mixture for 3 ~ 5 hours at the temperature of 900 ~ 1100 ℃ to obtain semi-finished cement;

s2, placing the semi-finished cement into a stirring barrel, adding water, a reinforcing material and an auxiliary agent, stirring at a high speed of 800-1000 rpm for 30-45 min, drying the stirred mixture by hot air, and crushing into powder after the material is dried to obtain the finished cement.

When the material is dried by hot air in the step S2, the temperature of the dried hot air is 110-130 ℃, and the time is 20-30 min.

Has the advantages that: the cement product is prepared by taking cement clinker containing low-alkalinity sulfate cement as a base material and matching modified alkali-resistant glass fiber, chopped carbon fiber and silica powder as reinforcing materials, so that the stability and strength of the formed cement are improved, the product has the characteristics of light weight, high strength and corrosion resistance, the internal system of the formed cement is stable, the early and later compressive strength and bending strength are excellent, the ductility and shear strength of the material are improved, the material has larger damage tolerance and energy absorption capacity during impact and cyclic loading, and the dimensional stability of the material is greatly improved. .

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.