CN117185728B - A kind of high strength wet mixed mortar and preparation method thereof - Google Patents

Abstract

The invention relates to the technical field of wet-mixed mortar, and provides high-strength wet-mixed mortar and a preparation method thereof, wherein the high-strength wet-mixed mortar comprises the following components in parts by weight: 550-600 parts of quartz sand, 80-100 parts of cement, 30-40 parts of fly ash, 25-35 parts of mineral powder, 6-9 parts of reinforcing fiber, 5-8 parts of water reducer, 0.5-1.5 parts of retarder, 1-3 parts of defoamer and 90-100 parts of water; the reinforcing fiber consists of polypropylene fiber, polyvinyl alcohol fiber and polyacrylonitrile fiber; the mass ratio of the polypropylene fiber to the polyvinyl alcohol fiber to the polyacrylonitrile fiber is 2:1:1-2. Through the technical scheme, the problem that the splitting tensile strength and the compressive strength of wet-mixed mortar in the prior art are low is solved.

Description

A kind of high strength wet mixed mortar and preparation method thereof

Technical Field

The present invention relates to the technical field of wet-mix mortar, and in particular to a high-strength wet-mix mortar and a preparation method thereof.

Background technique

Wet-mix mortar is mainly composed of cement, sand, admixtures and water. It is a green building material and an indispensable material in construction. It mainly has the functions of bonding and filling. It is suitable for the masonry and plastering of various concrete bricks, fly ash bricks and clay bricks. It can better meet the needs of bottom leveling in ordinary and special occasions and waterproofing, anti-seepage and leakage repair of basements, building roofs and internal and external walls, civil air defense, tunnels and home decoration projects. Therefore, it is widely used at home and abroad.

However, there are still some shortcomings in the current wet-mixed mortar, such as low strength and poor crack resistance. These problems cause holes and cracks to appear in the wet-mixed mortar after use. Therefore, it is necessary to develop a high-strength wet-mixed mortar.

Summary of the invention

The present invention provides a high-strength wet-mixed mortar and a preparation method thereof, which solves the problem of low splitting tensile strength and low compressive strength of the wet-mixed mortar in the related art.

The technical solution of the present invention is as follows:

A high-strength wet-mixed mortar comprises the following components in parts by weight: 550-600 parts of quartz sand, 80-100 parts of cement, 30-40 parts of fly ash, 25-35 parts of mineral powder, 6-9 parts of reinforcing fibers, 5-8 parts of water reducers, 0.5-1.5 parts of retarders, 1-3 parts of defoamers, and 90-100 parts of water; the reinforcing fibers are composed of polypropylene fibers, polyvinyl alcohol fibers, and polyacrylonitrile fibers; and the mass ratio of the polypropylene fibers, the polyvinyl alcohol fibers, and the polyacrylonitrile fibers is 2:1:1-2.

As a further technical solution, the mass ratio of the polypropylene fiber, the polyvinyl alcohol fiber and the polyacrylonitrile fiber is 2:1:1.8.

As a further technical solution, the length of the polypropylene fiber is 3mm-9mm.

As a further technical solution, the length of the polypropylene fiber is 6 mm.

As a further technical solution, the length of the polyvinyl alcohol fiber is 3mm-9mm.

As a further technical solution, the length of the polyvinyl alcohol fiber is 6 mm.

As a further technical solution, the length of the polyacrylonitrile fiber is 3mm-9mm.

As a further technical solution, the length of the polyacrylonitrile fiber is 6 mm.

The present invention finds that when the lengths of the polypropylene fibers, the polyvinyl alcohol fibers and the polyacrylonitrile fibers are all 6 mm, the splitting tensile strength and the compressive strength of the wet-mixed mortar can be better improved.

As a further technical solution, the water reducer is one of a polycarboxylic acid water reducer and a naphthalene water reducer.

As a further technical solution, the defoaming agent is a silicone defoaming agent.

As a further technical solution, the retarder includes one or more of potassium hydrogen phosphate, sodium citrate, and sodium tartrate.

As a further technical solution, the quartz sand is composed of coarse quartz sand with a particle size of 70-140 meshes and fine quartz sand with a particle size of 20-70 meshes.

As a further technical solution, the mass ratio of the coarse quartz sand to the fine quartz sand is 1:1-2.

The present invention also includes a method for preparing high-strength wet-mixed mortar, comprising the following steps: uniformly mixing quartz sand, cement, fly ash, mineral powder, reinforcing fiber, water reducer, retarder and defoamer, adding water, and uniformly mixing again to obtain wet-mixed mortar.

The working principle and beneficial effects of the present invention are:

1. Three specific reinforcing fibers are added in the present invention, which are polypropylene fiber, polyvinyl alcohol fiber and polyacrylonitrile fiber. By limiting the addition amount of the three reinforcing fibers, the three reinforcing fibers can work better together, further improving the splitting tensile strength and compressive strength of the wet mixed mortar.

2. The present invention can better improve the splitting tensile strength and compressive strength of wet-mixed mortar by limiting the length of polypropylene fibers, polyvinyl alcohol fibers and polyacrylonitrile fibers.

Detailed ways

The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

In the following embodiments and comparative examples:

Polycarboxylate water reducer, model 003, purchased from Shandong Hongyi Chemical Group Co., Ltd.;

Silicone defoamer, model 670, purchased from Guangzhou Donghui Trading Co., Ltd.;

Polypropylene fibers, diameters of 3 mm, 6 mm, and 9 mm, were purchased from Langfang Junshang Technology Co., Ltd.;

Polyvinyl alcohol fibers, diameters of 3 mm, 6 mm, and 9 mm, were purchased from Shanghai Yingjia Industrial Development Co., Ltd.;

Polyacrylonitrile fibers, with diameters of 3 mm, 6 mm, and 9 mm, were purchased from Taian Tongyu Building Materials Co., Ltd.

Example 1

A method for preparing wet-mixed mortar with good water retention comprises the following steps:

550 parts of quartz sand, 80 parts of cement, 30 parts of fly ash, 25 parts of mineral powder, 6 parts of reinforcing fiber, 5 parts of polycarboxylic acid water reducer, 0.5 parts of potassium hydrogen phosphate, and 1 part of silicone defoamer are uniformly stirred, and then 90 parts of water are added to obtain wet mixed mortar; the reinforcing fiber consists of polypropylene fiber (3mm), polyvinyl alcohol fiber (3mm) and polyacrylonitrile fiber (3mm) in a mass ratio of 2:1:1; the quartz sand consists of coarse quartz sand with a particle size of 70-90 mesh and fine quartz sand with a particle size of 20-40 mesh, and the mass ratio of coarse quartz sand to fine quartz sand is 1:1.

Example 2

A method for preparing wet-mixed mortar with good water retention comprises the following steps:

580 parts of quartz sand, 90 parts of cement, 35 parts of fly ash, 30 parts of mineral powder, 7 parts of reinforcing fiber, 6 parts of polycarboxylic acid water reducer, 1 part of sodium citrate and 2 parts of silicone defoaming agent are mixed evenly, and then 95 parts of water are added to obtain wet mixed mortar; the reinforcing fiber consists of polypropylene fiber (3mm), polyvinyl alcohol fiber (3mm) and polyacrylonitrile fiber (3mm) in a mass ratio of 2:1:1; the quartz sand consists of coarse quartz sand with a particle size of 90-120 mesh and fine quartz sand with a particle size of 40-60 mesh, and the mass ratio of coarse quartz sand to fine quartz sand is 1:1.5.

Example 3

A method for preparing wet-mixed mortar with good water retention comprises the following steps:

600 parts of quartz sand, 100 parts of cement, 40 parts of fly ash, 35 parts of mineral powder, 9 parts of reinforcing fiber, 8 parts of polycarboxylic acid water reducer, 1.5 parts of sodium tartrate and 3 parts of silicone defoamer are mixed evenly, and then 100 parts of water are added to obtain wet mixed mortar; the reinforcing fiber consists of polypropylene fiber (3-9mm), polyvinyl alcohol fiber (3mm) and polyacrylonitrile fiber (3mm) in a mass ratio of 2:1:1; the quartz sand consists of coarse quartz sand with a particle size of 120-140 mesh and fine quartz sand with a particle size of 60-70 mesh, and the mass ratio of coarse quartz sand to fine quartz sand is 1:2.

Example 4

Compared with Example 1, Example 4 is different in that the length of the polypropylene fiber is 6 mm.

Example 5

Compared with Example 1, the difference in Example 5 is that the length of the polypropylene fiber is 9 mm.

Example 6

Compared with Example 4, Example 6 is different in that the length of the polyvinyl alcohol fiber is 6 mm.

Example 7

Compared with Example 4, Example 7 is different in that the length of the polyvinyl alcohol fiber is 9 mm.

Example 8

Compared with Example 6, Example 8 is different in that the length of the polyacrylonitrile fiber is 6 mm.

Example 9

Compared with Example 6, Example 9 is different in that the length of the polyacrylonitrile fiber is 9 mm.

Example 10

Compared with Example 8, the difference in Example 10 is that the mass ratio of polypropylene fiber (6 mm), polyvinyl alcohol fiber (6 mm) and polyacrylonitrile fiber (6 mm) is 2:1:1.8.

Embodiment 11

Compared with Example 8, the difference in Example 11 is that the mass ratio of the polypropylene fiber (6 mm), the polyvinyl alcohol fiber (6 mm) and the polyacrylonitrile fiber (6 mm) is 2:1:2.

Comparative Example 1

Compared with Example 1, Comparative Example 1 does not add polyvinyl alcohol fiber (3 mm) and polyacrylonitrile fiber (3 mm), and the rest is the same as Example 1.

Comparative Example 2

Compared with Example 1, Comparative Example 2 does not add polyvinyl alcohol fiber (3 mm), and the rest is the same as Example 1.

Comparative Example 3

Compared with Example 1, Comparative Example 3 does not add polyacrylonitrile fiber (3 mm), and the rest is the same as Example 1.

Test example

The wet mixed mortar in Examples 1-11 and Comparative Examples 1-3 was prepared into 70 mm × 70 mm × 70 mm cubic specimens, and the splitting tensile strength and compressive strength of the cubic specimens after curing for 28 days were measured according to the method in GB/T50081-2019 “Test Method for Mechanical Properties of Ordinary Concrete”. The measurement results are shown in Table 1.

Table 1 Performance test results of wet mixed mortar in Examples 1-11 and Comparative Examples 1-3

Compared with Example 1, Comparative Example 1 does not add polyvinyl alcohol fiber (3mm) and polyacrylonitrile fiber (3mm), Comparative Example 2 does not add polyvinyl alcohol fiber (3mm), and Comparative Example 3 does not add polyacrylonitrile fiber (3mm). As a result, the splitting tensile strength and compressive strength of the wet-mixed mortar in Comparative Examples 1-3 are lower than those in Example 1, indicating that adding polyvinyl alcohol fiber and polyacrylonitrile fiber at the same time on the basis of adding polypropylene fiber can improve the splitting tensile strength and compressive strength of the wet-mixed mortar.

Compared with Example 1, Examples 4-5 change the length of the polypropylene fiber. As a result, the splitting tensile strength and compressive strength of the wet-mixed mortar in Example 4 are higher than those in Example 1 and Example 5, indicating that when the length of the polypropylene fiber is 6 mm, the splitting tensile strength and compressive strength of the wet-mixed mortar can be better improved.

Compared with Example 4, Examples 6-7 changed the length of the polyvinyl alcohol fiber. As a result, the splitting tensile strength and compressive strength of the wet-mixed mortar in Example 6 were higher than those in Examples 4 and 7, indicating that when the fiber length of polyvinyl alcohol is 6 mm, the splitting tensile strength and compressive strength of the wet-mixed mortar can be better improved.

Compared with Example 6, Examples 8-9 changed the length of the polyacrylonitrile fiber. As a result, the splitting tensile strength and compressive strength of the wet-mixed mortar in Example 8 were higher than those in Examples 6 and 9, indicating that when the length of the polyacrylonitrile fiber is 6 mm, the splitting tensile strength and compressive strength of the wet-mixed mortar can be better improved.

Compared with Example 8, Examples 10-11 changed the mass ratio of polyvinyl alcohol fiber to polyacrylonitrile fiber. As a result, the splitting tensile strength and compressive strength of the wet mixed mortar in Example 10 were higher than those in Example 8 and Example 11, indicating that when the mass ratio of polyvinyl alcohol fiber to polyacrylonitrile fiber is 1:1.8, the splitting tensile strength and compressive strength of the wet mixed mortar can be better improved.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims (7)

1. A high-strength wet-mixed mortar, characterized in that it comprises the following components in parts by weight: 550-600 parts of quartz sand, 80-100 parts of cement, 30-40 parts of fly ash, 25-35 parts of mineral powder, 6-9 parts of reinforcing fiber, 5-8 parts of water reducer, 0.5-1.5 parts of retarder, 1-3 parts of defoamer, and 90-100 parts of water; the reinforcing fiber is composed of polypropylene fiber, polyvinyl alcohol fiber and polyacrylonitrile fiber; the mass ratio of the polypropylene fiber, the polyvinyl alcohol fiber and the polyacrylonitrile fiber is 2:1:1.8; the length of the polypropylene fiber is 6 mm, the length of the polyvinyl alcohol fiber is 6 mm, and the length of the polyacrylonitrile fiber is 6 mm. 2. A high-strength wet-mix mortar according to claim 1, characterized in that the water reducer comprises one of a polycarboxylic acid water reducer and a naphthalene-based water reducer. 3. A high-strength wet-mix mortar according to claim 1, characterized in that the defoaming agent is a silicone defoaming agent. 4. A high-strength wet-mix mortar according to claim 1, characterized in that the retarder comprises one or more of potassium hydrogen phosphate, sodium citrate, and sodium tartrate. 5. A high-strength wet-mixed mortar according to claim 1, characterized in that the quartz sand consists of coarse quartz sand with a particle size of 70-140 mesh and fine quartz sand with a particle size of 20-70 mesh. 6. A high-strength wet-mix mortar according to claim 5, characterized in that the mass ratio of the coarse quartz sand to the fine quartz sand is 1:1-2. 7. A method for preparing a high-strength wet-mixed mortar according to any one of claims 1 to 6, characterized in that it comprises the following steps: after uniformly mixing quartz sand, cement, fly ash, mineral powder, reinforcing fiber, water reducer, retarder and defoamer, adding water, and uniformly mixing again to obtain wet-mixed mortar.