阅读说明：本技术 一种玻璃纤维复合水泥及其制备方法 (Glass fiber composite cement and preparation method thereof ) 是由 刘品 于 2019-11-18 设计创作，主要内容包括：本发明公开了一种玻璃纤维复合水泥及其制备方法,该玻璃纤维复合水泥利用含ZrO<Sub>2</Sub>12.5wt%~14wt%的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,得到的耐碱性玻璃纤维作为原料与水泥熟料、工业废渣、粉煤灰、矿渣以及相关助剂制备；其制备时先将工业废渣与矿渣、粉煤灰进行高温煅烧后在中温条件下加入水泥熟料继续煅烧制得半成品水泥,然后将半成品水泥与耐碱性玻璃纤维、助剂和水高速混合后热风干燥、再粉碎至粉末状,得到成品水泥。本发明所制备的水泥碱度低,机械强度高,并具有较强的稳定性和耐候性。(The invention discloses glass fiber composite cement and a preparation method thereof, wherein the glass fiber composite cement utilizes ZrO-containing 2 12.5wt% ~ 14wt% alkali-resistant glass fiber as raw material, modifying m-phenyl neopentyl glycol type unsaturated polyester resin, dehydroacetic acid, 1-3 propanediol in silane coupling agent KH570, preparing the alkali-resistant glass fiber as raw material, cement clinker, industrial waste residue, fly ash, slag and related auxiliary agents, calcining the industrial waste residue, slag and fly ash at high temperature, adding the cement clinker to calcine at medium temperature to obtain semi-finished cement, mixing the semi-finished cement, alkali-resistant glass fiber, auxiliary agent and water at high speed, drying with hot air, and pulverizing to powder to obtain the final product cementStronger stability and weather resistance.)

1. The glass fiber composite cement is characterized by comprising the following raw materials in parts by mass:

60 ~ 80 portions of cement clinker

Industrial slag 25 ~ 40 weight portions

30 ~ 40 portions of fly ash

10 ~ 15 portions of slag

2 ~ 5 parts of alkali-resistant glass fiber

0.8 part of assistant 0.8 ~ 3

Wherein, the alkali-resistant glass fiber adopts ZrO₂The alkali-resistant glass fiber containing 12.5wt% of ~ 14wt% is subjected to surface modification treatment, wherein the surface modification treatment is that the alkali-resistant glass fiber, m-phenyl neopentyl glycol type unsaturated polyester resin, dehydroacetic acid and 1-3 propylene glycol are uniformly mixed according to the ratio of 60:5:5:1, then the mixture is kept standing for 30 ~ 40min, then the mixture is added into a silane coupling agent KH570 together and mixed and stirred for 60 ~ 90min, and then the mixture is dried by hot air to obtain the alkali-resistant glass fiber after the modification treatment.

2. The glass fiber composite 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.

3. The glass fiber composite cement as claimed in claim 1, wherein the industrial waste residue is a mixture of cement kiln waste and waste building waste in a weight ratio of 1:3 ~ 1:5, and the waste building waste is used as the waste building waste.

4. The glass fiber composite cement as claimed in claim 1, wherein the auxiliary agent comprises cellulose ether 30 ~ 40%, defoamer 0 ~ 30%, water reducer 0 ~ 30%, aluminum hydroxide 15 ~ 20%, water repellent 5 ~ 15% and magnesium carbonate 10 ~ 15%.

5. The glass fiber composite cement according to claim 4, wherein the cellulose ether is one of ethyl methyl cellulose, hydroxypropyl methyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose.

6. The glass fiber composite cement according to claim 4, wherein the defoaming agent is a polyether-based defoaming agent.

7. The glass fiber composite cement of claim 4, wherein the defoamer is an organosiloxane.

8. The glass fiber composite cement as claimed in claim 4, wherein the water repellent is a sodium methyl silicate water repellent.

9. A method for preparing glass fiber composite cement, which is characterized in that the raw material of the glass fiber composite cement as claimed in claim 1 ~ 8 is used for preparation, and the production flow comprises the following steps:

s1, respectively crushing the cement clinker, the industrial waste residue, the fly ash and the slag in parts by weight, mixing the crushed industrial waste residue, the slag and the fly ash, calcining for 3 ~ 5 hours at the temperature of 900 ~ 1100 ℃, adding the cement clinker when the mixture is naturally cooled to 650 ~ 700 ℃ along with a furnace, preserving heat, calcining for 5 ~ 8 hours, and naturally cooling to obtain semi-finished cement;

s2, placing the semi-finished cement into a stirring barrel, adding water, alkali-resistant glass fiber 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.

10. The method for preparing glass fiber composite cement according to claim 9, wherein the hot air temperature for drying is 110 to 130 ℃ for 20 to 30min when the material is hot air dried in step S2.

Technical Field

The invention relates to the technical field of cement preparation processes, in particular to glass fiber composite 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 large brittleness, small compressive strength, cement hydration accompanied with volume shrinkage and the like, so that the concrete is likely to have cracks, a freeze-thaw effect, chlorine-sulfur corrosion or other types of corrosion and the like, and the strength and the service performance of the concrete are obviously reduced; in addition, as a high-pollution and high-energy-consumption industry, the cement manufacturing industry consumes high social resources, in order to reduce the consumption and construct an environment-friendly industrial structure, some manufacturers also use building waste materials obtained by disassembling waste buildings as raw materials to prepare cement, and although the cement can greatly reduce the raw material consumption, reduce the production cost and reduce the environmental pollution, due to the defects of the process and the raw materials, the strength of the formed cement is low, the existing durability problem is difficult to control, the cracking phenomenon easily occurs in the using process, and additional reinforcing materials (such as glass fibers) are needed to reinforce and stabilize the internal structure.

The glass fiber is used as an inorganic non-metallic material with excellent performance, is prepared by taking glass as a raw material and carrying out processes such as high-temperature melting, wire drawing, winding, weaving and the like, has the advantages that the diameter of a single wire can reach the micron level, has good insulativity, strong heat resistance, good corrosion resistance, high mechanical strength and the like, can be used as a reinforcing material to form a stable cross-linked structure in a formed cement system, and improves the stability of the reinforcing material. However, glass fibers present problems of erosion and embrittlement in the cementitious matrix, which requires modification or alkali resistance to the cementitious matrix to protect the matrix from physical and chemical attack.

For the reasons, the glass fiber reinforced cement is prepared by directly adopting glass fibers, and the glass fiber reinforced cement is a fiber cement composite material which takes alkali-resistant glass fibers as a reinforcing material and cement mortar as a base material. It has not only excellent tensile, bending and shock resistance, but also good crack resistance, light weight, easy moulding, convenient processing, moisture resistance, no combustion and other advantages, and is a new composite material with high strength and high stability. The glass fiber can improve the tensile strength and ductility of cement mortar, and is used for improving the strength and stability of the formed concrete. However, glass fiber reinforced cement has its own drawbacks, namely that the highly alkaline environment of the cement mortar matrix corrodes the glass fibers, causing their mechanical properties to deteriorate gradually over time and eventually to age and become brittle materials. However, even when the alkali-resistant glass fiber is used to prepare the glass fiber reinforced cement, the aging problem still occurs, so that the application range of the glass fiber reinforced cement is limited, and the glass fiber reinforced cement is not suitable for being prepared by using building wastes as raw materials under the existing process conditions.

Disclosure of Invention

The invention aims to provide glass fiber composite cement and a preparation method thereof, the composite cement can effectively reduce the cost by using industrial waste residues as raw materials, is convenient to recycle, and is reinforced by using glass fibers so as to solve the technical defects in the prior art.

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

the glass fiber composite cement comprises the following raw materials in parts by mass:

60 ~ 80 portions of cement clinker

Industrial slag 25 ~ 40 weight portions

30 ~ 40 portions of fly ash

10 ~ 15 portions of slag

2 ~ 5 parts of alkali-resistant glass fiber

0.8 part of assistant 0.8 ~ 3

Wherein, the alkali-resistant glass fiber adopts ZrO₂The alkali-resistant glass fiber containing 12.5wt% of ~ 14wt% is subjected to surface modification treatment, wherein the surface modification treatment is that the alkali-resistant glass fiber, m-phenyl neopentyl glycol type unsaturated polyester resin, dehydroacetic acid and 1-3 propylene glycol are uniformly mixed according to the ratio of 60:5:5:1, then the mixture is kept standing for 30 ~ 40min, then the mixture is added into a silane coupling agent KH570 together and mixed and stirred for 60 ~ 90min, and then the mixture is dried by hot air to obtain the alkali-resistant glass fiber after the modification treatment.

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

The industrial waste residue is a mixture of cement kiln bottom materials and waste building materials in a weight ratio of 1:3 ~ 1:5, wherein the waste building materials are recycled aggregates obtained after reinforcing steel bars are removed from the disassembled wall, floor, ceiling and beam of the waste building.

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.

A preparation method of glass fiber composite cement comprises the following main production processes:

s1, respectively crushing the cement clinker, the industrial waste residue, the fly ash and the slag in parts by weight, mixing the crushed industrial waste residue, the slag and the fly ash, calcining for 3 ~ 5 hours at the temperature of 900 ~ 1100 ℃, adding the cement clinker when the mixture is naturally cooled to 650 ~ 700 ℃ along with a furnace, preserving heat, calcining for 5 ~ 8 hours, and naturally cooling to obtain semi-finished cement;

s2, placing the semi-finished cement into a stirring barrel, adding water, alkali-resistant glass fiber 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 invention has the advantages of energy saving, environmental protection, strong practical operability, good flexibility, fast hydration reaction, high early strength and no need of moisture curing and solidification; the formed glass fiber cement has excellent physical and chemical properties, and the glass fiber can form a stable system in a cement structure after being modified, and can effectively ensure and improve the cement strength by matching with a low-alkalinity cement matrix, improve the alkali resistance of the cement and widen the application range of the glass fiber reinforced cement.

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.