Metal oxide modified biphase chopped glass fiber high-strength permeable mortar

Abstract

The invention discloses metal oxide modified biphase chopped glass fiber high-strength permeable mortar, which is prepared from the following components in parts by weight: 30 to 40 parts of ordinary Portland cement, 45 to 55 parts of superfine sand aggregate, 25 to 35 parts of mineral admixture, 5 to 15 parts of fiber material, 3 to 8 parts of silane water repellent agent, 0.5 to 1.5 parts of water reducing agent, 1 to 2 parts of inorganic foaming agent and 30 to 50 parts of water. The mineral admixture is a mixture of silica fume and ultralight ceramsite in a mass ratio of (30-45): (55-70). The ultralight ceramsite is prepared by mixing fly ash, bauxite, calcium lignosulphonate, borax, sawdust and bentonite according to the mass ratio of (50-65): (15-25): (1-3): (3-8): (5-15): (2-5), grinding, adding water for homogenization, roasting at high temperature for foaming, and cooling. The fiber material is a metal oxide modified biphase chopped glass fiber, and is prepared by respectively melting and compounding a corrosion-resistant glass phase and a high-strength glass phase according to a mass ratio of 60: (45-35), and then spinning, co-extruding and chopping. The water-permeable mortar provided by the invention not only has excellent mechanical properties, but also has relatively high porosity and good water permeability.

Description

Technical Field

[0001] The invention relates to the technical field of building materials, and in particular to a metal oxide-modified dual-phase chopped glass fiber high-strength water-permeable mortar. Background Art

[0002] The expansion of urban areas and changes in their structure have resulted in urban surfaces being gradually covered by reinforced concrete buildings, large-scale infrastructure, various impermeable sites, and extremely permeable concrete pavements. In some areas, this coverage rate has exceeded 80%. The impermeability of concrete pavements makes it difficult for the pavement to exchange heat and moisture with the air, lacking the ability to regulate urban surface temperature and humidity. As densely paved and hardened surfaces become increasingly common, urban rainfall is forced to drain into rivers and lakes through drainage systems. When heavy rains occur, drainage systems and river water levels cannot meet drainage requirements, leading to urban flooding.

[0003] Permeable mortar is a functional building material with high porosity that allows rapid water penetration. It is widely used in projects such as sponge cities, permeable pavements, and plazas. Its excellent permeability can effectively relieve pressure on urban drainage systems and replenish groundwater, making it extremely beneficial for urban flood control, groundwater conservation, and even water purification. Permeable mortar exhibits excellent plasticity and can be formed into permeable bricks of varying shapes and sizes to suit the specific pavement structure. This balances the functional use of the hardened surface for human activities with the effective protection of the habitats of plants, animals, and microorganisms beneath the pavement, fully embodying the sustainable development of the natural biological environment. Permeable mortar also offers excellent sound absorption, and its porous surface structure effectively mitigates traffic and environmental noise. Permeable mortar can also mitigate the "heat island" phenomenon. The abundant capillary water in the soil cools the surface temperature through natural evaporation and transpiration under solar radiation.

[0004] Research on permeable mortar began abroad in the 1960s. After the 1970s, the production and application of liquid polybutadiene developed rapidly, with companies in the United States, Germany, and Japan commencing operations. The emergence of highly reactive liquid polybutadiene resin, produced by Degussa, a German company specializing in environmentally friendly technologies, filled this technological gap. Replacing cement-bonded quartz sand with highly reactive liquid polybutadiene resin achieves high hardened strength and excellent water vapor permeability. This ensures that the permeable bricks fully utilize their permeability while ensuring sufficient pavement strength and a simple paving process. This ensures the widespread application of permeable pavements. After several major changes, Germany's technology for utilizing permeable materials in urban pavements has entered a stage of standardization and industrialization. As early as the 1990s, Japan began to conduct experimental tests on permeable concrete pavements. After a permeable concrete pavement was completed and opened to traffic and used for three months, its permeability, pavement wear, pavement surface temperature and noise level were tested and evaluated one by one. The data results showed that this type of pavement is conducive to the restoration of groundwater by natural rainwater, and can reduce the pavement temperature through heat conduction between the gaps, and reduce the noise generated by cars through the sound reduction effect of the gaps.

[0005] my country's research on permeable materials began in the late 1990s, a relatively late start, and the level of research and application lags far behind that of foreign countries. A review of relevant research and applications at home and abroad reveals that permeable mortar currently has the following technical problems: 1. The contradiction between the strength and permeability of permeable paving materials is prominent, and the honeycomb structure of permeable concrete results in poor compression and flexural properties. 2. After long-term use, pores become clogged, permeability declines severely, the ecological effect decays sharply, maintenance costs are high, and the technology still has many application blind spots. 3. The water retention function is weak, and the ecological effect is not fully realized. 4. Mortar is usually only permeable to the surface layer, and the overall ecological effect of the paving structure has not been fully developed, and there is a lack of systematic technology. How to efficiently and cheaply produce high-strength, wear-resistant, and non-slip permeable mortar has become a technical problem that needs to be urgently solved in the domestic permeable material industry. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a high-strength, permeable mortar made of dual-phase chopped glass fibers modified with metal oxides, addressing the shortcomings of the existing technology. The present invention utilizes ordinary Portland cement as the gel material, ultrafine sand aggregate to create a continuous skeleton with capillary pores, and the addition of mineral admixtures consisting of silica fume and ultralight ceramsite, resulting in both macropores and a reinforcing effect. Dual-phase chopped glass fibers modified with metal oxides are used to enhance the mortar's crack resistance without affecting its permeability. The porosity and permeability of the permeable mortar are further enhanced by the addition of a silane hydrophobic agent and an inorganic foaming agent.

[0007] In order to solve the above technical problems, the technical solution of the present invention is:

[0008] A metal oxide modified dual-phase chopped glass fiber high-strength water-permeable mortar, comprising the following components in parts by weight:

[0009] 30-40 parts of ordinary Portland cement

[0010] 45-55 parts of extra-fine sand aggregate

[0011] 25-35 parts of mineral admixture

[0012] 5-15 parts fiber material

[0013] 3-8 parts of silane hydrophobic agent

[0014] 0.5-1.5 parts of water reducer

[0015] 1-2 parts inorganic foaming agent

[0016] 30-50 parts water

[0017] The mineral admixture is a mixture of silica fume and ultra-light ceramsite in a mass ratio of 30-45:55-70. The ultra-light ceramsite is prepared by mixing, grinding, adding water for homogenization, high-temperature roasting and foaming, and cooling at a mass ratio of 50-65:15-25:1-3:3-8:5-15:2-5 for fly ash, bauxite, calcium lignin sulfonate, borax, sawdust, and bentonite.

[0018] The fiber material is a metal oxide-modified dual-phase chopped glass fiber, which is prepared by melt-compounding a corrosion-resistant glass phase and a high-strength glass phase in a mass ratio of 60:45-35, followed by spinneret co-extrusion and chopped processing. The corrosion-resistant glass phase is prepared by uniformly mixing any two or more corrosion-resistant metal oxides of ZrO2, TiO2, CeO2, ZnO, V2O5, WO2, MoO2, and MnO2 with glass fibers in a certain mass ratio, followed by heating and melting. The high-strength glass phase is prepared by uniformly mixing metal oxides CaO, MgO, and Al2O3 with glass fibers in a mass ratio of 8-15:12-20:15-20:55-65, followed by heating and melting.

[0019] As a preferred embodiment of the above technical solution, the corrosion-resistant metal oxide accounts for 16%-25% by mass in the corrosion-resistant glass phase.

[0020] As a preferred embodiment of the above technical solution, the length of the metal oxide modified dual-phase chopped glass fibers is 6-12 mm.

[0021] As a preferred embodiment of the above technical solution, the silica fume has a porosity of 50-80% and a particle size of 10-20 μm.

[0022] As a preferred embodiment of the above technical solution, the ultra-light ceramsite particle size is 1-20 μm and the bulk density is 180 kg / m 3 -200kg / m 3 .

[0023] As a preferred embodiment of the above technical solution, the fineness modulus of the ultra-fine sand is 1.5-0.7, and the particle size is 2-5 μm.

[0024] As a preferred embodiment of the above technical solution, the water reducer is a polycarboxylic acid water reducer.

[0025] As a preferred embodiment of the above technical solution, the inorganic foaming agent is calcium carbide, calcite, or calcium carbonate.

[0026] As a preferred embodiment of the above technical solution, the preparation of the metal oxide modified dual-phase chopped glass fiber high-strength permeable mortar comprises the following steps:

[0027] Step 1: Preparation of mineral admixtures

[0028] Mix fly ash, bauxite, and borax, grind them together, and pass through a 200-mesh sieve. Add calcium lignin sulfonate, sawdust, and bentonite, mix thoroughly, and pass through a 350-mesh sieve. Add water to a moisture content of 15%-20% and homogenize for 24 hours. Preheat to 350°C-400°C to remove water for 1 hour, then heat to 700°C-750°C for calcination and foaming for 3 hours. Slowly cool to produce ultra-light ceramsite. Finally, add silica fume and mix thoroughly to form the mineral admixture.

[0029] Step 2: Preparation of metal oxide modified dual-phase chopped glass fiber material

[0030] Two or more corrosion-resistant metal oxides are mixed with glass fibers and then heated and melted to produce a corrosion-resistant glass phase. The metal oxides CaO, MgO, and Al2O3 are mixed with glass fibers and then heated and melted to produce a high-strength glass phase. The corrosion-resistant and high-strength glass phases are co-extruded through a composite spinneret at 1450°C-1500°C and then cooled by air at a controlled cooling rate of 120°C / s-150°C / s to prevent phase separation, thereby producing a modified dual-phase glass fiber. The modified dual-phase glass fiber is chopped using a diamond tool at a cutting speed of 300 m / min. Finally, a 0.1% quaternary ammonium salt antistatic agent is sprayed on the fiber to produce a metal oxide-modified dual-phase chopped glass fiber material.

[0031] Step 3: Preparation of high-strength permeable mortar

[0032] Ordinary Portland cement, extra-fine sand aggregate, mineral admixture, metal oxide-modified dual-phase chopped glass fiber material, silane hydrophobic agent, water reducer and inorganic foaming agent are stirred and mixed, water is added to control the water-cement ratio to 0.25-0.35, and the mixture is evenly mixed to obtain high-strength permeable mortar.

[0033] As a preferred embodiment of the above technical solution, the porosity of the high-strength water-permeable mortar is 15%-25%.

[0034] Due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0035] The high-strength, permeable mortar of this invention uses ordinary Portland cement as the binder and ultra-fine sand aggregate to create a continuous skeleton with capillary pores. Ultra-light ceramsite, a mineral admixture, is added to adjust the porosity, creating a macroporous skeleton. An inorganic foaming agent is added, and its high-temperature decomposition produces carbon dioxide, which optimizes the pore size distribution and closed porosity, thereby forming a porous stacked structure. By effectively adjusting the dosage of each component, the ratio between capillary pores and macropores is controlled, thereby balancing the permeability and strength of the mortar.

[0036] In order to stabilize the porosity of the mortar and improve the strength of the mortar, the present invention adopts a dual-phase chopped glass fiber modified by metal oxides. By selecting corrosion-resistant metal oxides and adjusting the material ratio, the glass fiber is modified to prepare a corrosion-resistant glass phase. The metal oxides CaO, MgO, and Al2O3 are used to modify the glass fiber to prepare a high-strength glass phase. By chopped by two-phase melt co-extrusion drawing, the interfacial bonding force and mechanical properties of the glass fiber are effectively improved, and the dispersibility in the mortar is improved. The metal oxide-modified dual-phase chopped glass fiber is evenly distributed in the mortar system, and effectively fills the submicron pores and cracks in the slurry in the form of bridging, promotes hydration reaction, forms a high-density CSH and a denser microstructure, so that the pores are interconnected to form a water-permeable channel, improves strength and crack resistance without affecting water permeability.

[0037] The invention uses silica fume as an auxiliary mineral admixture to improve durability and fluidity, significantly increasing strength. Silane hydrophobizing agents are added to enhance fiber-cement interface bonding, while polycarboxylate water-reducing agents are used to reduce the water-cement ratio and balance porosity and strength. DETAILED DESCRIPTION

[0038] The present invention will be further described below with reference to the following examples. It should be understood that these examples are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.

[0039] Example 1

[0040] Step 1: Preparation of mineral admixtures

[0041] The mineral admixtures are silica fume and ultra-light ceramsite in a mass ratio of 30:70. The ultra-light ceramsite is made up of fly ash, bauxite, calcium lignin sulfonate, borax, sawdust, and bentonite in a mass ratio of 50:19:3:8:15:5. Water is added to a moisture content of 15%. The silica fume has a porosity of 65% and a particle size of 10-20 μm.

[0042] Mix fly ash, bauxite and borax and grind them, then pass through a 200 mesh sieve. Add calcium lignin sulfonate, sawdust and bentonite, mix evenly, and pass through a 350 mesh sieve. Add water to a moisture content of 16% and homogenize for 24 hours. Preheat to 350℃-400℃ to remove water for 1 hour, then heat to 700℃-750℃ for roasting and foaming for 3 hours, and slowly cool to obtain ultra-light ceramsite with a particle size of 1-20μm and a bulk density of 180kg / m 3 -200kg / m 3 Finally, add silica fume and mix well to prepare mineral admixture.

[0043] Step 2: Preparation of metal oxide modified dual-phase chopped glass fiber material

[0044] The corrosion-resistant glass phase and the high-strength glass phase are fed in a mass ratio of 60:45. The corrosion-resistant glass phase uses corrosion-resistant metal oxides ZrO2 and CeO2, and is fed in a mass ratio of 70:30. The corrosion-resistant metal oxides account for 16% of the corrosion-resistant glass phase. The high-strength glass phase is fed with metal oxides CaO, MgO, Al2O3 and glass fiber in a mass ratio of 15:12:15:58.

[0045] A corrosion-resistant glass phase is prepared by uniformly mixing a corrosion-resistant metal oxide with glass fibers and then heating and melting them. A high-strength glass phase is prepared by uniformly mixing metal oxides CaO, MgO, and Al2O3 with glass fibers and then heating and melting them. The corrosion-resistant and high-strength glass phases are co-extruded through a composite spinneret at 1450°C-1500°C and then cooled by air at a controlled cooling rate of 120°C / s-150°C / s to prevent phase separation, thereby preparing a modified dual-phase glass fiber. The modified dual-phase glass fiber is chopped using a diamond tool at a cutting speed of 300 m / min and then sprayed with a 0.1% quaternary ammonium salt antistatic agent to prepare a metal oxide-modified dual-phase chopped glass fiber material with a fiber length of 6-12 mm.

[0046] Step 3: Preparation of high-strength permeable mortar

[0047] The following components, calculated by weight, are included: 30 parts ordinary Portland cement, 45 parts ultrafine sand aggregate, 25 parts mineral admixture, 5 parts fiber material, 3 parts silane hydrophobizing agent, 0.5 parts water reducer, 1 part inorganic foaming agent, 30 parts water, and a water-cement ratio of 0.27. The ultrafine sand has a fineness modulus of 1.5-0.7 and a particle size of 2-5 μm. The water reducer is a polycarboxylic acid-based water reducer. Calcium carbide is used as the inorganic foaming agent.

[0048] Ordinary Portland cement, extra-fine sand aggregate, mineral admixture, metal oxide-modified dual-phase chopped glass fiber material, silane hydrophobic agent, water reducer and inorganic foaming agent are stirred and mixed, water is added to control the water-cement ratio to 0.27, and the mixture is evenly mixed to obtain high-strength permeable mortar.

[0049] Example 2

[0050] Step 1: Preparation of mineral admixtures

[0051] The mineral admixtures are silica fume and ultra-light ceramsite in a mass ratio of 35:65. The ultra-light ceramsite is made of fly ash, bauxite, calcium lignin sulfonate, borax, sawdust, and bentonite in a mass ratio of 65:15:3:3:10:4. Water is added to a moisture content of 18%. The silica fume has a porosity of 50% and a particle size of 10-20 μm.

[0052] The preparation steps are the same as in Example 1.

[0053] Step 2: Preparation of metal oxide modified dual-phase chopped glass fiber material

[0054] The corrosion-resistant glass phase and the high-strength glass phase are fed in a mass ratio of 60:35. The corrosion-resistant glass phase uses corrosion-resistant metal oxides ZrO2, ZnO, and CeO2, and is fed in a mass ratio of 50:25:25. The corrosion-resistant metal oxides account for 18% of the corrosion-resistant glass phase. The high-strength glass phase is fed with metal oxides CaO, MgO, Al2O3 and glass fiber in a mass ratio of 8:12:15:65.

[0055] The preparation steps are the same as in Example 1.

[0056] Step 3: Preparation of high-strength permeable mortar

[0057] The composition, calculated by weight, includes the following: 35 parts ordinary Portland cement, 50 parts ultrafine sand aggregate, 32 parts mineral admixture, 15 parts fiber material, 5 parts silane hydrophobizing agent, 1 part water reducer, 1.5 parts inorganic foaming agent, and 35 parts water, for a water-cement ratio of 0.25. The ultrafine sand has a fineness modulus of 1.5-0.7 and a particle size of 2-5 μm. The water reducer is a polycarboxylic acid-based water reducer. The inorganic foaming agent is calcite.

[0058] The preparation steps are the same as in Example 1.

[0059] Example 3

[0060] Step 1: Preparation of mineral admixtures

[0061] The mineral admixtures are silica fume and ultra-light ceramsite in a mass ratio of 40:60. The ultra-light ceramsite is made of fly ash, bauxite, calcium lignin sulfonate, borax, sawdust, and bentonite in a mass ratio of 55:15:2:8:15:5. Water is added to a moisture content of 20%. The silica fume has a porosity of 70% and a particle size of 10-20 μm.

[0062] The preparation steps are the same as in Example 1.

[0063] Step 2: Preparation of metal oxide modified dual-phase chopped glass fiber material

[0064] The corrosion-resistant glass phase and the high-strength glass phase are fed in a mass ratio of 60:40. The corrosion-resistant glass phase uses corrosion-resistant metal oxides TiO2, WO2, MoO2, and MnO2 in a mass ratio of 45:15:15:25. The corrosion-resistant metal oxides account for 20% of the corrosion-resistant glass phase. The high-strength glass phase is made of metal oxides CaO, MgO, Al2O3 and glass fiber in a mass ratio of 10:20:15:55.

[0065] The preparation steps are the same as in Example 1.

[0066] Step 3: Preparation of high-strength permeable mortar

[0067] The composition, calculated by weight, includes the following: 38 parts ordinary Portland cement, 52 parts ultrafine sand aggregate, 28 parts mineral admixture, 12 parts fibrous material, 8 parts silane hydrophobizing agent, 1 part water reducer, 1.5 parts inorganic foaming agent, and 41 parts water, for a water-cement ratio of 0.29. The ultrafine sand has a fineness modulus of 1.5-0.7 and a particle size of 2-5 μm. The water reducer is a polycarboxylic acid-based water reducer. Calcium carbonate is used as the inorganic foaming agent.

[0068] The preparation steps are the same as in Example 1.

[0069] Example 4

[0070] Step 1: Preparation of mineral admixtures

[0071] The mineral admixtures are silica fume and ultra-light ceramsite in a mass ratio of 45:55. The ultra-light ceramsite is made up of fly ash, bauxite, calcium lignin sulfonate, borax, sawdust, and bentonite in a mass ratio of 58:25:1:3:11:2. Water is added to a moisture content of 18%. The silica fume has a porosity of 75% and a particle size of 10-20 μm.

[0072] The preparation steps are the same as in Example 1.

[0073] Step 2: Preparation of metal oxide modified dual-phase chopped glass fiber material

[0074] The corrosion-resistant glass phase and the high-strength glass phase are fed in a mass ratio of 60:38. The corrosion-resistant glass phase uses corrosion-resistant metal oxides TiO2, ZnO, V2O5, and WO2, fed in a mass ratio of 40:30:15:15; the corrosion-resistant metal oxides account for 22% of the corrosion-resistant glass phase. The high-strength glass phase is made of metal oxides CaO, MgO, Al2O3 and glass fiber in a mass ratio of 8:12:20:60.

[0075] The preparation steps are the same as in Example 1.

[0076] Step 3: Preparation of high-strength permeable mortar

[0077] The composition, calculated by weight, includes the following: 40 parts ordinary Portland cement, 55 parts ultrafine sand aggregate, 35 parts mineral admixture, 15 parts fiber material, 8 parts silane hydrophobizing agent, 1.5 parts water reducer, 2 parts inorganic foaming agent, 50 parts water, and a water-cement ratio of 0.32. The ultrafine sand has a fineness modulus of 1.5-0.7 and a particle size of 2-5 μm. The water reducer is a polycarboxylic acid-based water reducer. Calcium carbide is used as the inorganic foaming agent.

[0078] The preparation steps are the same as in Example 1.

[0079] Example 5

[0080] Step 1: Preparation of mineral admixtures

[0081] The mineral admixtures are silica fume and ultra-light ceramsite in a mass ratio of 38:62. The ultra-light ceramsite is made of fly ash, bauxite, calcium lignin sulfonate, borax, sawdust, and bentonite in a mass ratio of 62:23:2:5:5:3. Water is added to a moisture content of 16%. The silica fume has a porosity of 80% and a particle size of 10-20 μm.

[0082] The preparation steps are the same as in Example 1.

[0083] Step 2: Preparation of metal oxide modified dual-phase chopped glass fiber material

[0084] The corrosion-resistant glass phase and the high-strength glass phase are fed in a mass ratio of 60:42. The corrosion-resistant glass phase uses corrosion-resistant metal oxides ZrO2, TiO2, and CeO2 in a mass ratio of 40:30:30. The corrosion-resistant metal oxides account for 25% of the corrosion-resistant glass phase. The high-strength glass phase is made of metal oxides CaO, MgO, Al2O3 and glass fiber in a mass ratio of 8:14:18:60.

[0085] The preparation steps are the same as in Example 1.

[0086] Step 3: Preparation of high-strength permeable mortar

[0087] The composition, by weight, includes the following: 32 parts ordinary Portland cement, 48 parts ultrafine sand aggregate, 30 parts mineral admixture, 10 parts fibrous material, 5 parts silane hydrophobizing agent, 1 part water reducer, 2 parts inorganic foaming agent, 45 parts water, and a water-cement ratio of 0.35. The ultrafine sand has a fineness modulus of 1.5-0.7 and a particle size of 2-5 μm. The water reducer is a polycarboxylic acid-based water reducer. Calcium carbide is used as the inorganic foaming agent.

[0088] The preparation steps are the same as in Example 1.

[0089] The performance test of the metal oxide modified dual-phase chopped glass fiber high-strength permeable mortar sample prepared in the above embodiment is as follows:

[0090] Mechanical property test method: The mechanical properties of permeable mortar were determined with reference to the national standard GB 17671-1999 "Test method for strength of cement mortar". Test blocks of 40mm×40mm×160mm were made and the flexural and compressive strengths were measured after curing for 28 days under standard conditions.

[0091] Porosity test method: Place the sample in a standard curing room for one day and then take it out. Use a balance to weigh its weight in the saturated surface dry state and record the value. Place the sample in a water container and add water to the container until the water level is at least 5 cm above the sample surface. Soak for 24 hours. Take out the sample and place it in the middle of the hanging basket. Use a static balance to weigh the mass of the sample in water. When placing the sample in water, shake it up and down to expel the bubbles inside so that the water can fully occupy the pores of the sample. After weighing, take out the sample and place it for 10 minutes. After the water inside the sample is expelled, put it in a constant temperature drying oven and dry it to constant weight. Take out the test piece and cool it to room temperature and weigh its mass in the air and record the value. Three samples are needed to measure the porosity of permeable mortar. The value is the average value of the three samples. The total porosity and connected porosity of the sample are calculated according to the following formulas (1) and (2):

[0092] P1=[1-(w1-w2) / v]×100% (1)

[0093] P2=[1-(w3-w4) / v]×100% (2)

[0094] Where: P1 - total porosity of permeable concrete;

[0095] P2 - connected porosity of permeable concrete;

[0096] w1——mass of the sample in the saturated surface dry state, g;

[0097] w2——mass of the sample in water, g;

[0098] w3——mass of the sample dried to constant weight, g;

[0099] v——volume of the sample, cm 3 .

[0100] Permeability test method: Place a cylindrical permeable concrete specimen with a diameter of 110mm and a height of 150mm in a standard curing room for curing. To measure the permeability, place the specimen in the test device. After installing the permeability test device, fill a large water container with water until the water level covers the pump. Turn on the pump. When water is steadily flowing from the upper outlet, record the amount of water discharged from the lower outlet within a time period of t. While pumping, use a ruler to measure the water level difference between the overflow pipe and the liquid surface. Perform three tests per group and take the average value. Record the temperature of the water in the container.

[0101] The permeability coefficient of permeable concrete is calculated according to formula (3):

[0102] K T =(H·Q / h·A·Δt)×(η T / η 15 ) (3)

[0103] Where: K T ——Water permeability coefficient of the sample when the water temperature is T℃, in cm / s;

[0104] H - water level difference, in cm;

[0105] Q——The mass of water discharged in time t, in cm 3 ;

[0106] h——sample height, in cm;

[0107] A——cross-sectional area of the sample, in cm 2 ;

[0108] Δt——test time, in seconds;

[0109] η T / η 15 ——Relative viscosity of water at test temperature (T℃) and 15℃.

[0110] Test method for fluidity of cement paste: The fluidity of cement paste is measured using the method specified in the national standard GB / T8077-2000 "Test method for homogeneity of concrete admixtures".

[0111] The test results are shown in Table 1.

[0112] Table 1

[0113]

[0114] It can be seen from the above test results that the permeable mortar provided by the present invention not only has excellent mechanical properties, but also has a high porosity and good permeability.

[0115] In addition, it should be understood that after reading the contents of the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. A metal oxide modified dual-phase chopped glass fiber high-strength permeable mortar, characterized in that: In parts by weight, it comprises the following components: 30-40 parts of ordinary Portland cement 45-55 parts of extra-fine sand aggregate 25-35 parts of mineral admixture 5-15 parts fiber material 3-8 parts of silane hydrophobic agent 0.5-1.5 parts of water reducer 1-2 parts inorganic foaming agent 30-50 parts water The mineral admixture is a mixture of silica fume and ultra-light ceramsite in a mass ratio of 30-45:55-70. The ultra-light ceramsite is prepared by mixing, grinding, adding water for homogenization, high-temperature roasting and foaming, and cooling at a mass ratio of 50-65:15-25:1-3:3-8:5-15:2-5 for fly ash, bauxite, calcium lignin sulfonate, borax, sawdust, and bentonite. The fiber material is a metal oxide-modified dual-phase chopped glass fiber, which is prepared by melt-compounding a corrosion-resistant glass phase and a high-strength glass phase in a mass ratio of 60:45-35, followed by spinneret co-extrusion and chopped processing. The corrosion-resistant glass phase is prepared by uniformly mixing any two or more corrosion-resistant metal oxides of ZrO2, TiO2, CeO2, ZnO, V2O5, WO2, MoO2, and MnO2 with glass fibers in a certain mass ratio, followed by heating and melting. The high-strength glass phase is prepared by uniformly mixing metal oxides CaO, MgO, and Al2O3 with glass fibers in a mass ratio of 8-15:12-20:15-20:55-65, followed by heating and melting.

2. The metal oxide modified dual-phase chopped glass fiber high-strength water-permeable mortar according to claim 1, characterized in that: The corrosion-resistant metal oxide accounts for 16% to 25% by mass in the corrosion-resistant glass phase.

3. The metal oxide modified dual-phase chopped glass fiber high-strength water-permeable mortar according to claim 1, characterized in that: The metal oxide modified dual-phase chopped glass fibers have a length of 6-12 mm.

4. The metal oxide modified dual-phase chopped glass fiber high-strength water-permeable mortar according to claim 1, characterized in that: The silica fume has a porosity of 50-80% and a particle size of 10-20 μm.

5. The metal oxide modified dual-phase chopped glass fiber high-strength water-permeable mortar according to claim 1, characterized in that: The particle size of the ultra-light ceramsite is 1-20 μm, and the bulk density is 180 kg / m 3 -200kg / m 3 .

6. The metal oxide modified dual-phase chopped glass fiber high-strength water-permeable mortar according to claim 1, characterized in that: The ultra-fine sand has a fineness modulus of 1.5-0.7 and a particle size of 2-5 μm.

7. The metal oxide modified dual-phase chopped glass fiber high-strength water-permeable mortar according to claim 1, characterized in that: The water reducer is a polycarboxylic acid water reducer.

8. The metal oxide modified dual-phase chopped glass fiber high-strength water-permeable mortar according to claim 1, characterized in that: The inorganic foaming agent is calcium carbide, calcite, or calcium carbonate.

9. The metal oxide modified dual-phase chopped glass fiber high-strength water-permeable mortar according to claim 1, characterized in that: The preparation of the metal oxide modified dual-phase chopped glass fiber high-strength water-permeable mortar comprises the following steps: Step 1: Preparation of mineral admixtures Mix fly ash, bauxite, and borax, grind them together, and pass through a 200-mesh sieve. Add calcium lignin sulfonate, sawdust, and bentonite, mix thoroughly, and pass through a 350-mesh sieve. Add water to a moisture content of 15%-20% and homogenize for 24 hours. Preheat to 350°C-400°C to remove water for 1 hour, then heat to 700°C-750°C for calcination and foaming for 3 hours. Slowly cool to produce ultra-light ceramsite. Finally, add silica fume and mix thoroughly to form the mineral admixture. Step 2: Preparation of metal oxide modified dual-phase chopped glass fiber material Two or more corrosion-resistant metal oxides are mixed with glass fibers and then heated and melted to produce a corrosion-resistant glass phase. The metal oxides CaO, MgO, and Al2O3 are mixed with glass fibers and then heated and melted to produce a high-strength glass phase. The corrosion-resistant and high-strength glass phases are co-extruded through a composite spinneret at 1450°C-1500°C and then cooled by air at a controlled cooling rate of 120°C / s-150°C / s to prevent phase separation, thereby producing a modified dual-phase glass fiber. The modified dual-phase glass fiber is chopped using a diamond tool at a cutting speed of 300 m / min. Finally, a 0.1% quaternary ammonium salt antistatic agent is sprayed on the fiber to produce a metal oxide-modified dual-phase chopped glass fiber material. Step 3: Preparation of high-strength permeable mortar Ordinary Portland cement, extra-fine sand aggregate, mineral admixture, metal oxide-modified dual-phase chopped glass fiber material, silane hydrophobic agent, water reducer and inorganic foaming agent are stirred and mixed, water is added to control the water-cement ratio to 0.25-0.35, and the mixture is evenly mixed to obtain high-strength permeable mortar.

10. The metal oxide modified dual-phase chopped glass fiber high-strength water-permeable mortar according to claim 1, characterized in that: The high-strength water-permeable mortar has a porosity of 15%-25%.

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