Method for preparing unidirectional distributive steel fiber reinforced mortar and special equipment thereof

Abstract

The invention discloses a method for preparing unidirectional distributive steel fiber reinforced mortar and special equipment thereof, and relates to fiber reinforced mortar. The method comprises the following key steps of: pouring the prepared steel fiber mortar mixture into a nonmetallic test die and placing the nonmetallic test die into a cavity in a framework of a coil of the special equipment for preparing the unidirectional distributive steel fiber reinforced mortar, placing the coil and the test die on a vibrating table of the special equipment together, and turning on a direct-current power supply of the special equipment to power on the coil so as to form a magnetic field and apply the magnetic field to the prepared steel fiber mortar mixture to realize steel fiber orientation, wherein the direction of the magnetic field is accordant with the tensile stress direction of a test piece in a testing or working state. The special equipment consists of the vibrating table, the coil and the direct-current power supply. The breaking strength of the unidirectional distributive steel fiber reinforced mortar prepared by using the method and the special equipment is improved by 25 to 100 percent compared with the steel fiber reinforced mortar prepared by using the conventional method, or 25 to 60 percent of steel fiber is saved.

Description

technical field

[0001] The technical solution of the present invention relates to the technical solution of the present invention relates to fiber-reinforced mortar, specifically a method for preparing unidirectionally distributed steel fiber-reinforced mortar and special equipment thereof. Background technique

[0002] Mortar is a widely used material in construction engineering. It is widely used in reinforced mortar structures and masonry structures. It can be used as structural materials and non-structural materials. It is the main building material for repairing walls and floors. Construction mortar is characterized by high compressive strength, low tensile strength and small ultimate strain, and is a brittle material. Due to these characteristics, the mortar has poor toughness and is easy to crack, resulting in a decline in project quality. Adding steel fiber is one of the most effective ways to improve the crack resistance, toughness and tensile properties of mortar....

Examples

Embodiment 1

[0045] The first step is to prepare the steel fiber mortar mixture

[0046] According to the known design method, the mass ratio of the mortar composition components determined by the strength grade of M5 is water: cement: sand: superplasticizer=0.56: 1: 3: 0.003, and the required amount during actual operation is weighed Water: cement and sand, and then take steel fiber with a volumetric dosage of 1.5% in ordinary mortar (the densities of steel, cement, and water are respectively 7800kg / m 3 、3100kg / m 3 、1000kg / m 3 , and the quality of the required steel fiber can be determined accordingly), the steel fiber used is a steel wire cut steel fiber with a length of 13mm and an aspect ratio of 40. First put the weighed cement and sand into the dry material of the mortar mixer and stir evenly, then put in the weighed steel fiber while stirring, then add the weighed mixing water and high-efficiency water reducer, continue stirring for 60 seconds and then discharge , the measured co...

Embodiment 2

[0058] The first step is to prepare the steel fiber mortar mixture

[0059] According to the known design method, the mass ratio of the mortar components whose strength grade is M10 is water: cement: sand: high-efficiency water reducing agent = 0.3: 1: 1.5: 0.006. Water: cement and sand, and then take steel fiber with a volumetric dosage of 1.5% in ordinary mortar (the densities of steel, cement, and water are respectively 7800kg / m 3 、3100kg / m 3 、1000kg / m 3 , and the quality of the required steel fiber can be determined accordingly), the steel fiber used is a steel wire cut steel fiber with a length of 13mm and an aspect ratio of 40. Put the weighed water into the mixer first, then put in the weighed cement, turn on the mixer and stir for 20 seconds, add the weighed sand while stirring, then add the weighed steel fiber while stirring, and continue stirring for 180 seconds , the measured consistency of the steel fiber mortar mixture is 40mm;

[0060] The second step, pourin...

Embodiment 3

[0071] According to the known design method, the mass ratio of the mortar components whose strength grade is M7.5 is water: cement: sand: high-efficiency water reducer = 0.42: 1: 2: 0.004. Amount of water: cement and sand, then take the steel fiber that is mixed with a volume of 0.5% in ordinary mortar (the densities of steel, cement, and water are respectively 7800kg / m 3 、3100kg / m 3 、1000kg / m 3 , and the quality of the required steel fiber can be determined accordingly), the steel fiber used is a steel wire cut steel fiber with a length of 13mm and an aspect ratio of 40. Put the weighed water and superplasticizer into the mixer first, then put in the weighed cement, turn on the mixer and stir for 120 seconds, add the weighed sand while stirring, and then put in the weighed steel fiber while stirring , continue to stir for 300 seconds, and measure the consistency of the steel fiber mortar mixture to be 80mm;

[0072] The second step, pouring into the test mold

[0073] Pou...

technical field

[0001] The technical solution of the present invention relates to the technical solution of the present invention relates to fiber-reinforced mortar, specifically a method for preparing unidirectionally distributed steel fiber-reinforced mortar and special equipment thereof. Background technique

[0002] Mortar is a widely used material in construction engineering. It is widely used in reinforced mortar structures and masonry structures. It can be used as structural materials and non-structural materials. It is the main building material for repairing walls and floors. Construction mortar is characterized by high compressive strength, low tensile strength and small ultimate strain, and is a brittle material. Due to these characteristics, the mortar has poor toughness and is easy to crack, resulting in a decline in project quality. Adding steel fiber is one of the most effective ways to improve the crack resistance, toughness and tensile properties of mortar....

Examples

Embodiment 1

[0045] The first step is to prepare the steel fiber mortar mixture

[0046] According to the known design method, the mass ratio of the mortar composition components determined by the strength grade of M5 is water: cement: sand: superplasticizer=0.56: 1: 3: 0.003, and the required amount during actual operation is weighed Water: cement and sand, and then take steel fiber with a volumetric dosage of 1.5% in ordinary mortar (the densities of steel, cement, and water are respectively 7800kg / m 3 、3100kg / m 3 、1000kg / m 3 , and the quality of the required steel fiber can be determined accordingly), the steel fiber used is a steel wire cut steel fiber with a length of 13mm and an aspect ratio of 40. First put the weighed cement and sand into the dry material of the mortar mixer and stir evenly, then put in the weighed steel fiber while stirring, then add the weighed mixing water and high-efficiency water reducer, continue stirring for 60 seconds and then discharge , the measured co...

Embodiment 2

[0058] The first step is to prepare the steel fiber mortar mixture

[0059] According to the known design method, the mass ratio of the mortar components whose strength grade is M10 is water: cement: sand: high-efficiency water reducing agent = 0.3: 1: 1.5: 0.006. Water: cement and sand, and then take steel fiber with a volumetric dosage of 1.5% in ordinary mortar (the densities of steel, cement, and water are respectively 7800kg / m 3 、3100kg / m 3 、1000kg / m 3 , and the quality of the required steel fiber can be determined accordingly), the steel fiber used is a steel wire cut steel fiber with a length of 13mm and an aspect ratio of 40. Put the weighed water into the mixer first, then put in the weighed cement, turn on the mixer and stir for 20 seconds, add the weighed sand while stirring, then add the weighed steel fiber while stirring, and continue stirring for 180 seconds , the measured consistency of the steel fiber mortar mixture is 40mm;

[0060] The second step, pourin...

Embodiment 3

[0071] According to the known design method, the mass ratio of the mortar components whose strength grade is M7.5 is water: cement: sand: high-efficiency water reducer = 0.42: 1: 2: 0.004. Amount of water: cement and sand, then take the steel fiber that is mixed with a volume of 0.5% in ordinary mortar (the densities of steel, cement, and water are respectively 7800kg / m 3 、3100kg / m 3 、1000kg / m 3 , and the quality of the required steel fiber can be determined accordingly), the steel fiber used is a steel wire cut steel fiber with a length of 13mm and an aspect ratio of 40. Put the weighed water and superplasticizer into the mixer first, then put in the weighed cement, turn on the mixer and stir for 120 seconds, add the weighed sand while stirring, and then put in the weighed steel fiber while stirring , continue to stir for 300 seconds, and measure the consistency of the steel fiber mortar mixture to be 80mm;

[0072] The second step, pouring into the test mold

[0073] Pou...

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