Preparation method of waste glass fire-resistant high-strength concrete

文档序号：627759 发布日期：2021-05-11 浏览：4次中文

阅读说明：本技术 一种废玻璃耐火高强混凝土的制备方法 (Preparation method of waste glass fire-resistant high-strength concrete ) 是由王迎斌李阳贺行洋王文娜李欣懋熊光李齐徐立杨杰刘文志秦景燕于 2021-01-08 设计创作，主要内容包括：本发明公开了一种废玻璃耐火高强混凝土的制备方法,包括如下步骤：步骤1、对废玻璃、铝渣进行干法粉磨得到废玻璃颗粒、铝渣和废玻璃粉；步骤2、使用无水乙醇作为研磨介质对废玻璃粉进行湿磨处置,得到玻璃粉浆料；步骤3、对步骤2中的玻璃粉浆料进行水洗抽滤,得到超细废玻璃粉；步骤4、将步骤3中的超细废玻璃粉、水泥、废玻璃颗粒、铝渣、河砂、碎石、拌合用水、减水剂、缓凝剂进行混合搅拌得到耐火高强度混凝土。本发明选取固废为原材料进行制备,节能环保,超细玻璃粉能提升混凝土的力学性能,通过硅相和铝相的反应提升混凝土的耐火性能。(The invention discloses a preparation method of waste glass fireproof high-strength concrete, which comprises the following steps: step 1, performing dry grinding on waste glass and aluminum slag to obtain waste glass particles, aluminum slag and waste glass powder; step 2, carrying out wet grinding treatment on the waste glass powder by using absolute ethyl alcohol as a grinding medium to obtain glass powder slurry; step 3, washing and filtering the glass powder slurry obtained in the step 2 to obtain superfine waste glass powder; and 4, mixing and stirring the superfine waste glass powder, the cement, the waste glass particles, the aluminum slag, the river sand, the broken stone, the mixing water, the water reducing agent and the retarder in the step 3 to obtain the refractory high-strength concrete. The invention selects solid wastes as raw materials for preparation, is energy-saving and environment-friendly, and the superfine glass powder can improve the mechanical property of concrete and improve the fire resistance of the concrete through the reaction of silicon phase and aluminum phase.)

1. The preparation method of the waste glass fireproof high-strength concrete is characterized by comprising the following steps of:

step 1, feeding waste glass and aluminum slag into a ball mill for dry grinding and crushing, grinding for 3-15min, and screening to obtain 2.3-3.0mm waste glass particles, aluminum slag and 20-25 mu m waste glass powder;

step 2, mixing the waste glass powder with the particle size of 20-25 mu m obtained by the dry grinding with a grinding aid according to a required proportion, adding grinding balls of a zirconia medium, putting the mixture into a reaction kettle, carrying out wet grinding through a planetary wet grinder for 20-60min, and obtaining glass powder slurry with the grinding speed of 350-400 r/min;

step 3, performing suction filtration operation, namely performing suction filtration on the glass powder slurry obtained in the step 2 on a suction filter for 2-3 times by using clear water to obtain superfine waste glass powder without grinding aid;

and 4, weighing 14-20 parts of portland cement, 5-10 parts of aluminum slag, 2-4 parts of waste glass particles, 1-3 parts of superfine waste glass powder, 20-25 parts of river sand, 40-47 parts of broken stone, 6-12 parts of mixing water, 0.4-1.0 part of water reducing agent and 0.1-0.3 part of retarder according to parts by weight, and uniformly stirring the mixture by using a concrete mixer to obtain the refractory high-strength concrete doped with the waste glass.

2. The method for preparing the waste glass fire-resistant high-strength concrete according to claim 1, wherein the method comprises the following steps: the waste glass doped in the step 1 is soda-lime-silicate glass.

3. The method for preparing the waste glass fire-resistant high-strength concrete according to claim 1, wherein the method comprises the following steps: and (2) screening the waste glass particles and the aluminum slag subjected to dry grinding in the step (1) and then separately collecting the waste glass particles and the aluminum slag.

4. The method for preparing the waste glass fire-resistant high-strength concrete according to claim 1, wherein the method comprises the following steps: and 2, the grinding aid used in the wet grinding process in the step 2 is absolute ethyl alcohol.

5. The method for preparing the waste glass fire-resistant high-strength concrete according to claim 4, wherein the method comprises the following steps: in the step 2, absolute ethyl alcohol is used as a medium, and the nano-scale glass powder slurry is obtained after wet grinding, wherein the grain size grading is 0.32-0.73 mu m.

6. The method for preparing the waste glass fire-resistant high-strength concrete according to claim 1, wherein the method comprises the following steps: the waste glass particles with the particle size of 2.3-3.0mm and the aluminum slag after grinding in the step 1 replace part of river sand in the concrete component, and the mixing amount is 5% -15% and 15% -25% respectively.

7. The method for preparing the waste glass fire-resistant high-strength concrete according to claim 1, wherein the method comprises the following steps: the superfine waste glass powder obtained in the step 3 replaces part of cement in concrete components, and the replacing amount is 5-15%.

8. The method for preparing the waste glass fire-resistant high-strength concrete according to claim 1, wherein the method comprises the following steps: and in the step 4, the cement is ordinary portland cement with the model number of P.I 52.5.

9. The method for preparing the waste glass fire-resistant high-strength concrete according to claim 1, wherein the method comprises the following steps: the sand used in the step 4 is natural river sand with the particle size of 2.3-3.0 mm.

10. The method for preparing the waste glass fire-resistant high-strength concrete according to claim 1, wherein the method comprises the following steps: and 4, the water reducing agent in the step 4 is a polycarboxylic acid water reducing agent, and the retarder is a hydroxycarboxylic acid retarder.

Technical Field

The invention belongs to the technical field of building materials, and particularly relates to a method for preparing refractory high-strength concrete by doping waste glass.

Background

In the beginning of the 20 th century, the development of the refractory materials is towards high-purity, high-density and ultrahigh-temperature products, and unshaped refractory materials and refractory fibers which are completely free from sintering and have low energy consumption appear. With the development of new energy technology, refractory materials with comprehensive excellent performances such as high temperature resistance, corrosion resistance, thermal shock resistance, refractory material scouring and the like are widely applied. Under the promotion of the development of high-temperature industry and technical progress, the refractory material industry in China is rapidly developed. Refractory production has been the first world for many years, but the quality level of the refractory as a whole is far from the international advanced level.

With the development of industrialization process, more and more solid waste glass is generated in the production process, which accounts for about 7% of the total amount of waste garbage all over the world. In China, about 6 to 11 percent of solid waste slag generated every year is waste glass. At present, the aspect of waste glass treatment in China generally adopts a landfill method, but most of glass components are silicon dioxide, and the glass cannot be effectively degraded in a short time after landfill, so that the landfill treatment mode not only causes environmental pollution, but also causes waste of land resources. The waste glass is doped into the concrete, so that the problem of environmental pollution caused by landfill is solved, the using amount of cement can be reduced, and the economic cost is reduced.

Patent publication No. CN111908870A discloses a method for preparing heat-resistant and fire-resistant concrete, which is prepared by adding mineral powder, aluminum powder, silicon powder and other substances into granite serving as fire-resistant coarse aggregate and andesite and basalt serving as fire-resistant fine aggregate. The concrete prepared by the method has excellent heat-resistant and fireproof performances. However, the preparation process is too complex, the raw materials are various and all the raw materials need to be processed for use, and the possibility of practical production is limited.

The patent with publication number CN103304247A discloses a zirconia refractory material and a preparation process thereof, which uses fused monoclinic zirconia, magnesia, yttria, barium oxide and a bonding agent as raw materials, and the raw materials are pre-fired, all the materials are mixed, dehydrated, compression molded and finally fired to obtain a final product. The refractory material prepared by the process has excellent thermal vibration performance and compactness. However, the process consumes excessive energy in the preparation process, and the prepared refractory material has low strength.

The patent with publication number CN101565321A discloses a method for producing forsterite refractory, which is made by firing magnesite tailings, magnesia and silica as raw materials. The preparation method is simple and low in production cost. However, the obtained refractory has a porosity as high as 74% and a low strength, and thus cannot be widely used.

The advantage of this patent lies in that used material is the industry and gives up admittedly, low in production cost. The waste glass powder and the aluminum slag are used for replacing partial cementing materials and fine aggregates respectively, the preparation process is simple, the raw materials are easy to obtain, the waste glass powder is treated in a wet grinding and superfine mode, the energy consumption is reduced, and the prepared concrete has excellent fire resistance and higher strength and can be applied and popularized in practical engineering.

Disclosure of Invention

Aiming at the problems in the prior art, the technical scheme adopted by the invention for solving the problems in the prior art is as follows:

the preparation method of the waste glass fireproof high-strength concrete is characterized by comprising the following steps of:

The waste glass doped in the step 1 is soda-lime-silicate glass.

And (2) screening the waste glass particles and the aluminum slag subjected to dry grinding in the step (1) and then separately collecting the waste glass particles and the aluminum slag.

And 2, the grinding aid used in the wet grinding process in the step 2 is absolute ethyl alcohol. The absolute ethyl alcohol has larger surface tension, and can grind the particle size to be finer.

In the step 2, absolute ethyl alcohol is used as a medium, and the nano-scale glass powder slurry is obtained after wet grinding, wherein the grain size gradation is about 0.32-0.73 mu m.

The waste glass particles with the particle size of 2.3-3.0mm and the aluminum slag after grinding in the step 1 replace part of river sand in the concrete component, and the mixing amount is 5-15 percent and 15-25 percent respectively

The superfine waste glass powder obtained in the step 3 replaces part of cement in concrete components, and the replacing amount is 5-15%.

And in the step 4, the cement is ordinary portland cement with the model number of P.I 52.5.

The sand used in the step 4 is natural river sand, and the particle size is about 2.3-3.0 mm.

And 4, the water reducing agent in the step 4 is a polycarboxylic acid water reducing agent, and the retarder is a hydroxycarboxylic acid retarder.

The invention has the following advantages:

1. after the waste glass is treated by a wet grinding mode, the particle size of the glass powder is reduced to a nanometer level. Add superfine glass powder and can preferentially form initial crystal nucleus in the concrete, produce a lot of nucleation sites, induced all kinds of mineral ions move to the crystal nucleus in cement hydration process, and the C-S-H gel that cement hydration formed can be adsorbed on the crystal nucleus surface simultaneously for the nucleation growth of hydration product in the early stage of hydration, thereby promote early strength.

2. The nano glass powder replaces part of cementing materials, and the performance, strength, durability and the like of the concrete can be improved to the greatest extent on the premise of ensuring the working performance. The waste glass powder and the aluminum slag replace part of fine aggregate, and Si phase and Al phase react to generate mullite when meeting high temperature, so that the mullite-containing silicon carbide has excellent fireproof performance.

3. The particle size of the glass powder is continuously reduced along with the prolonging of the wet grinding time, and the glass powder can be self-hydrated after reaching a certain fineness. After wet grinding treatment, the activity of various mineral components in the glass powder is excited, and some alkaline ions contained in the glass powder are dissolved out to generate Ca (OH)₂Etc. to create an alkaline environment, Ca (OH)₂And SiO in the glass powder₂The reaction generates C-S-H gel, hydration reaction occurs and heat is released.

4. The glass particles are mixed into the concrete instead of part of fine aggregate, the glass particles in the concrete are firstly changed into a molten state after meeting high temperature, and are filled in pores through flowing, and the glass particles are hardened into a solid state from the molten state after the temperature is cooled. The strength of the concrete is improved, and the whole building structure is not damaged at high temperature.

5. The Si phase contained in the waste glass and the Al phase contained in the aluminum slag react at high temperature to generate mullite. Chemical formula is 3Al₂O₃-2SiO₂The melting temperature is about 1910 ℃, and mullite is a high-quality refractory raw material and has the characteristics of uniform expansion, good thermal shock stability, large hardness and good chemical corrosion resistance. The waste glass and the aluminum ash are added into the concrete to generate mullite at high temperature, so that the fire resistance and the strength of the concrete can be obviously improved.

Detailed Description

The technical scheme of the invention is further specifically described by the following embodiments.

Comparative example (example 0):

the preparation method of the common concrete comprises the following steps: weighing 20 parts of ordinary portland cement, 30 parts of river sand, 42 parts of broken stone, 8 parts of mixing water, 0.60 part of polycarboxylic acid water reducing agent and 0.15 part of retarder according to parts by weight. And uniformly stirring the mixture by a concrete stirrer to obtain the common concrete.

Example 1: