CN111454028A

CN111454028A - Mixture with fire-resistant and heat-insulating functions

Info

Publication number: CN111454028A
Application number: CN202010267372.6A
Authority: CN
Inventors: 夏先刚
Original assignee: Guangdong Rongquanhui Concrete Co ltd
Current assignee: Guangdong Rongquanhui Concrete Co ltd
Priority date: 2020-04-08
Filing date: 2020-04-08
Publication date: 2020-07-28

Abstract

The invention relates to the technical field of concrete mixtures, in particular to a mixture with a fireproof and heat-insulating function, which comprises the following components in parts by weight: 100 parts of Portland cement; 250 portions and 300 portions of coarse aggregate; 180 portions of fine aggregate and 220 portions; 110-120 parts of magnesium fluoride; 25-30 parts of slag powder; 120 portions of water and 150 portions of water. The invention has the advantages of higher early strength and long-term strength, better corrosion resistance, better fire resistance and heat insulation performance, better quality and wider applicability.

Description

Mixture with fire-resistant and heat-insulating functions

Technical Field

The invention relates to the technical field of concrete mixtures, in particular to a mixture with fire-resistant and heat-insulating functions.

Background

At present, along with social development, concrete building structure is more and more popular, based on different operation requirements of different building structures, need adopt the mix of different properties, in the building of easy conflagration, building structure needs to have better fire-resistant adiabatic function to need adopt the mix that has fire-resistant adiabatic function to make fire-resistant concrete building structure.

The existing refractory concrete is special concrete which is directly cast by mixing materials prepared from three parts of aggregate, cementing agent and additive according to a certain proportion, wherein the cementing agent in the existing refractory concrete mainly adopts aluminate cement as a main material because the aluminate cement has high setting and hardening speed, large heat of hydration, strong sulfate corrosion resistance and high heat resistance.

The above prior art solutions have the following drawbacks:

the long-term strength of the aluminate refractory concrete has a tendency to be reduced, the long-term strength of the common aluminate refractory concrete is reduced by about 40-50%, so that the aluminate refractory concrete is not suitable for temporary engineering of long-term bearing structures and rush repair engineering (such as leakage stoppage), the applicability is narrow, and when the silicate cement with higher long-term strength is adopted to replace the aluminate cement to be used as a cementing agent, the prepared silicate concrete can effectively improve the defect that the long-term strength of the aluminate refractory concrete has the tendency to be reduced, but the refractory performance and the corrosion resistance of the silicate concrete are much poorer than those of the aluminate refractory concrete, so that a mixing material with less long-term strength reduction and better refractory performance and corrosion resistance is urgently needed.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a mixture with the functions of fire resistance and heat insulation, which has the effects of less long-term strength reduction and better fire resistance and corrosion resistance.

The above object of the present invention is achieved by the following technical solutions:

the mixture with the functions of fire resistance and heat insulation comprises the following components in parts by mass:

100 parts of Portland cement;

250 portions and 300 portions of coarse aggregate;

180 portions of fine aggregate and 220 portions;

110-120 parts of magnesium fluoride;

25-30 parts of slag powder;

120 portions of water and 150 portions of water.

By adopting the technical scheme, the portland cement is used as the cementing agent, so that the concrete structure made of the mixture has higher early strength and long-term strength, and the long-term strength of the made concrete structure is not easy to reduce, so that the concrete structure is suitable for short-term and long-term bearing structures and has wider applicability;

by adding the slag powder into the mixture, the concrete prepared from the mixture has better corrosion resistance, is suitable for projects with higher requirements on corrosion resistance, and further improves the applicability of the mixture;

by adding magnesium fluoride into the mixture, the prepared concrete structure has higher refractory temperature, better heat insulation effect and better fireproof and heat insulation performance, and simultaneously increases the compressive strength of the prepared concrete structure to a certain extent, so that the mixture has better quality, wider applicability and better application prospect.

The present invention in a preferred example may be further configured to: the paint also comprises the following components in parts by mass:

30-35 parts of dysprosium fluoride.

Through adopting above-mentioned technical scheme, through adding dysprosium fluoride and magnesium fluoride cooperation in the mixture for the refractory temperature of the concrete structure of mixture preparation is higher, is more difficult for warping, collapsing under high temperature, and structural stability is better, effectively improves the quality and the suitability of mixture.

1-2 parts of neodymium fluoride.

Through adopting above-mentioned technical scheme, through adding neodymium fluoride and dysprosium fluoride and magnesium fluoride cooperation in the mixture for the refractory temperature of the concrete structure of mixture preparation further improves, and the heat-proof quality also obtains promoting, protects people better when the conflagration, makes the regional temperature that does not catch fire rise slowly, more is favorable to people to flee and blocks that the conflagration spreads.

8-10 parts of carbon fiber.

Through adopting above-mentioned technical scheme, through adding carbon fiber in the mixture, effectively improve the anti fracture's of the concrete of mixture preparation performance, simultaneously because the carbon fiber melting point is higher, be difficult for softening or melt and warp when the conflagration for the effect of reinforcement concrete structure is comparatively lasted and is applicable to the high temperature state.

5-8 parts of zircon powder;

3-5 parts of fluorite powder.

Through adopting above-mentioned technical scheme, through adding zircon powder and fluorite powder in the mixture, effectively further improve the compressive strength of the concrete structure of mixture preparation for the concrete structure of preparing is stable, and because zircon powder is higher with fluorite powder self melting point, still can better keep the effect of reinforcement concrete structure under high temperature.

6-9 parts of ceramic powder.

By adopting the technical scheme, the ceramic powder is added into the mixture, so that the heat insulation performance of the concrete structure prepared from the mixture is better improved, the prepared concrete structure better blocks the fire spread and better protects people to escape by utilizing people.

The present invention in a preferred example may be further configured to: the preparation method of the mixture with the functions of fire resistance and heat insulation comprises the following steps:

step 1), mixing portland cement and water, and uniformly stirring to form cement slurry;

step 2) adding magnesium fluoride and slag powder into the cement slurry, and uniformly stirring to form a premix;

and 3) adding coarse aggregates and fine aggregates into the premix, and uniformly stirring to form a mixture with the functions of fire resistance and heat insulation.

By adopting the technical scheme, the magnesium fluoride and the slag powder are uniformly dispersed in the cement slurry, so that the magnesium fluoride and the slag powder are not blocked by coarse aggregates and fine aggregates during dispersion, and the dispersion is easy, the performance difference of the mixture is less, the performance distribution is uniform, and the quality is better.

The present invention in a preferred example may be further configured to: dysprosium fluoride, neodymium fluoride, carbon fibers, zircon powder, fluorite powder and ceramic powder are also added in the step 2).

By adopting the technical scheme, the prepared mixture has better compression resistance, cracking resistance, heat insulation performance and corrosion resistance after being prepared into a concrete structure, and has better quality.

In summary, the invention includes at least one of the following beneficial technical effects:

1. by adopting the silicate cement as a cementing agent and adding the slag powder and the magnesium fluoride into the mixture, the concrete structure made of the mixture has higher early strength and long-term strength, so that the concrete structure is suitable for short-term and long-term bearing structures, has better corrosion resistance and better fire-resistant and heat-insulating properties, has better quality and wider applicability, and has better application prospect;

2. by adding neodymium fluoride, dysprosium fluoride and magnesium fluoride into the mixture for matching, the fire resistance temperature of a concrete structure prepared from the mixture is further improved, the heat insulation performance is also improved, people are better protected in case of fire, the temperature of an area which is not on fire rises slowly, and people can escape and the fire spreading is blocked;

3. through adding carbon fiber in the mixture, effectively improve the anti fracture's of the concrete of mixture preparation performance, simultaneously because the carbon fiber melting point is higher, be difficult for softening or melt and warp when the conflagration for the effect of reinforcement concrete structure is comparatively lasted and is applicable to the high temperature state.

Drawings

FIG. 1 is a schematic flow chart of a method for preparing a mixture with fire-resistant and heat-insulating functions in the invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The information on the source of each raw material in the following examples and comparative examples is shown in Table 1

Examples 1 to 4

The mixture with the functions of fire resistance and heat insulation comprises the following components:

portland cement, coarse aggregate, fine aggregate, magnesium fluoride, slag powder, water and a water reducing agent.

The amounts (in kg) of the respective raw materials in examples 1 to 4 are shown in Table 2

TABLE 2

Referring to fig. 1, the method for preparing the admixture with fire-resistant and heat-insulating functions of examples 1 to 4 comprises the following steps:

step 1) adding portland cement, water and a water reducing agent into a stirring kettle, stirring at the rotating speed of 80r/min for 5min to form cement slurry.

And 2) adding magnesium fluoride and slag powder into the cement slurry, stirring for 8min at the rotating speed of 80r/min to form a premix.

And 3) adding coarse aggregates and fine aggregates into the premix, stirring for 15min at the rotating speed of 50r/min to form a mixture with the functions of fire resistance and heat insulation, and continuously stirring at the rotating speed of 25r/min until the use is finished.

Examples 5 to 8

The difference from example 4 is that:

the mixture with the functions of fire resistance and heat insulation further comprises the following components:

dysprosium fluoride.

The amounts (in kg) of the respective raw materials in examples 5 to 8 are shown in Table 3

TABLE 3

	Example 5	Example 6	Example 7	Example 8
					Portland cement	100	100	100	100
Coarse aggregate	260	260	260	260
					Fine aggregate	210	210	210	210
Magnesium fluoride	112	112	112	112
					Slag powder	26	26	26	26
Water (W)	135	135	135	135
					Water reducing agent	11	11	11	11
Dysprosium fluoride	30	32.5	35	33

Examples 9 to 12

The difference from example 4 is that:

the mixture with the functions of fire resistance and heat insulation further comprises the following components: dysprosium fluoride and neodymium fluoride.

The amounts (in kg) of the respective raw materials in examples 9 to 12 are shown in Table 4

TABLE 4

	Example 9	Example 10	Example 11	Example 12
					Portland cement	100	100	100	100
Coarse aggregate	260	260	260	260
					Fine aggregate	210	210	210	210
Magnesium fluoride	112	112	112	112
					Slag powder	26	26	26	26
Water (W)	135	135	135	135
					Water reducing agent	11	11	11	11
Dysprosium fluoride	30	32.5	35	33
					Neodymium fluoride	1	1.5	2	1.2

Examples 13 to 16

The difference from example 4 is that:

the mixture with the functions of fire resistance and heat insulation further comprises the following components: carbon fibers.

The amounts (in kg) of the respective raw materials in examples 13 to 16 are shown in Table 5

TABLE 5

Examples 17 to 20

The difference from example 4 is that:

the mixture with the functions of fire resistance and heat insulation further comprises the following components: zircon powder and fluorite powder.

The amounts (in kg) of the respective raw materials in examples 17 to 20 are shown in Table 6

TABLE 6

	Example 17	Example 18	Example 19	Example 20
					Portland cement	100	100	100	100
Coarse aggregate	260	260	260	260
					Fine aggregate	210	210	210	210
Magnesium fluoride	112	112	112	112
					Slag powder	26	26	26	26
Water (W)	135	135	135	135
					Water reducing agent	11	11	11	11
Zircon powder	5	6.5	8	7
					Fluorite powder	3	4	5	3.3

Examples 21 to 24

The difference from example 4 is that:

the mixture with the functions of fire resistance and heat insulation further comprises the following components: and (3) ceramic powder.

The amounts (in kg) of the respective raw materials in examples 21 to 24 are specified in Table 7

TABLE 7

Examples 25 to 28

The difference from example 4 is that:

the mixture with the functions of fire resistance and heat insulation further comprises the following components: dysprosium fluoride, neodymium fluoride, carbon fiber, zircon powder, fluorite powder and ceramic powder.

The amounts (in kg) of the respective raw materials in examples 25 to 28 are specified in Table 8

TABLE 8

	Example 25	Example 26	Example 27	Example 28
					Portland cement	100	100	100	100
Coarse aggregate	260	260	260	260
					Fine aggregate	210	210	210	210
Magnesium fluoride	112	112	112	112
					Slag powder	26	26	26	26
Water (W)	135	135	135	135
					Water reducing agent	11	11	11	11
Dysprosium fluoride	30	32.5	35	33
					Neodymium fluoride	1	1.5	2	1.2
Carbon fiber	8	9	10	8.5
					Zircon powder	5	6.5	8	7
Fluorite powder	3	4	5	3.3
					Ceramic powder	6	7.5	9	8

Comparative example 1

The difference from example 4 is that:

in the step 2), magnesium fluoride is equivalently replaced by a mixture of coarse aggregates and fine aggregates, and the mass ratio of the coarse aggregates to the fine aggregates in the mixture is 1: 1.

comparative example 2

The difference from example 4 is that:

in the step 2), slag powder is equivalently replaced by a mixture of coarse aggregates and fine aggregates, wherein the mass ratio of the coarse aggregates to the fine aggregates in the mixture is 1: 1.

experiment 1

The refractoriness under load of the samples prepared from the blends of the examples and comparative examples was measured according to GB/T5989-2008 "temperature differential heating method for refractories under load test method".

Experiment 2

Preparing a plurality of cylinders with the diameter of 10cm and the height of 20cm by adopting copper, connecting a copper sealing cover to one open end of each cylinder through a thread, building a pouring template outside each cylinder, pouring the mixture of each embodiment and each comparative example on the outer wall of each cylinder and the outer surface of each sealing cover respectively, standing for 7d to form a heat insulation layer with the thickness of 8mm through solidification, filling ice blocks in the cylinders, covering the sealing covers, placing the cylinders in a constant temperature environment of 25 ℃, standing for 2h, detecting the temperature of the outer surface of the heat insulation layer on the cylinders through an infrared thermometer, and proving that the heat insulation performance is better when the temperature is closer to 25 ℃.

Experiment 3

Manufacturing a mould, wherein the inner cavity of the mould is a space with the length, width and height of 5cm, pouring the mixture of each embodiment and each comparative example into the mould, standing for 28d, demoulding to obtain a concrete sample with the length, width and height of 5cm, putting the sample into a 100 ℃ oven to be dried for 2h to ensure drying, weighing the weight of the sample at the moment and recording the weight as the initial weight, completely soaking the sample in a sulfuric acid solution with the concentration of 10%, taking out the sample after soaking for 24h, washing the sample with deionized water for 10s, putting the sample into the 100 ℃ oven to be dried for 2h, weighing the weight of the sample at the moment and recording the weight as the weight after corrosion.

And subtracting the weight after corrosion from the initial weight to obtain a weight loss amount, and dividing the weight loss amount by the initial weight to obtain the weight loss percentage after corrosion, wherein the smaller the weight loss percentage after corrosion is, the stronger the corrosion resistance of the sample is proved.

Experiment 4

The cracking index of the samples prepared from the mixture of each example and each comparative example is tested according to GB/T29417-2012 test method for drying shrinkage cracking performance of cement mortar and concrete.

Experiment 5

The flexural strength (MPa) of the samples prepared from the mixture of each example and each comparative example is detected according to the flexural strength test in GB/T50081-2002 Standard test method for mechanical Properties of ordinary concrete.

Experiment 6

The 7d compressive strength (MPa) and 28d compressive strength (MPa) of the samples prepared from the mixture of each example and each comparative example are detected according to the compressive strength test in GB/T50081-2002 Standard test methods for mechanical Properties of common concrete.

The experimental data of experiments 1-6 are detailed in Table 9

TABLE 9

According to the comparison of the data of comparative example 1 and embodiment 4 in table 9, the magnesium fluoride is added into the mixture, so that the loading softening temperature of the concrete sample made of the mixture is effectively increased, namely the refractory temperature is higher, and the heat insulation performance and the compressive strength of the sample are effectively improved, so that the concrete structure made of the mixture is more stable and not easy to damage in a high-temperature environment, the heat transmission is better prevented, the fire spreading is delayed, and people can escape.

According to the comparison of the data of comparative example 2 and the data of embodiment 4 in the table 9, the slag powder is added into the mixture, so that the sulfuric acid corrosion resistance of the concrete sample prepared from the mixture is effectively improved, the mixture is suitable for occasions requiring high sulfur resistance, and the applicability is wide.

According to the comparison of the data of examples 5 to 8 and example 4 in table 9, dysprosium fluoride and magnesium fluoride are added into the mixture to be matched, so that the refractoriness under load of a concrete sample prepared from the mixture is further improved, namely, the refractory temperature is higher, the concrete sample is more stable at high temperature, and the applicability is wider.

According to the comparison of the data of the embodiments 9-12 and 4 in the table 9, neodymium fluoride, dysprosium fluoride and magnesium fluoride are added into the mixture to be matched, so that the refractoriness under load and the heat insulation performance of the concrete sample supported by the mixture are further improved, the concrete building structure made of the mixture is stable in structure at high temperature, heat propagation is blocked, fire spread is delayed, and people can escape.

According to the comparison of the data of the examples 13-16 and the example 4 in the table 9, the carbon fiber is added into the mixture, so that the cracking resistance of the sample is effectively improved, the concrete building structure made of the mixture is not easy to crack, and the effect of increasing the cracking resistance of the concrete building structure can still be maintained at high temperature due to the high melting point of the carbon fiber.

According to comparison of data of examples 17-20 and example 4 in table 9, zircon powder and fluorite powder are added into the mixture, so that the compressive strength of the sample is effectively improved, and the melting points of the zircon powder and the fluorite powder are higher, so that the effect of the concrete building structure made of the reinforced mixture can be still well maintained at high temperature.

According to comparison of data of examples 21-24 and example 4 in table 9, the ceramic powder is added into the mixture, so that the heat insulation performance of the sample is effectively improved, the concrete building structure made of the mixture can better block heat transmission, the fire spread is delayed, and people can escape.

From the data of examples 25-28 in Table 9, it can be seen that concrete structures made from the blend have higher refractory temperature, better thermal insulation properties, higher compressive strength, better crack resistance, better sulfuric acid corrosion resistance, and better quality.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims

1. The mixture with the functions of fire resistance and heat insulation is characterized in that: the paint comprises the following components in parts by mass:

100 parts of Portland cement;

250 portions and 300 portions of coarse aggregate;

180 portions of fine aggregate and 220 portions;

110-120 parts of magnesium fluoride;

25-30 parts of slag powder;

120 portions of water and 150 portions of water.

2. A mixture having a fire-resistant and heat-insulating function according to claim 1, wherein: the paint also comprises the following components in parts by mass:

30-35 parts of dysprosium fluoride.

3. A mixture having a fire-resistant and heat-insulating function according to claim 2, wherein: the paint also comprises the following components in parts by mass:

1-2 parts of neodymium fluoride.

4. A mixture having a fire-resistant and heat-insulating function according to any one of claims 1 to 3, wherein: the paint also comprises the following components in parts by mass:

8-10 parts of carbon fiber.

5. A mixture having a fire-resistant and heat-insulating function according to any one of claims 1 to 3, wherein: the paint also comprises the following components in parts by mass:

5-8 parts of zircon powder;

3-5 parts of fluorite powder.

6. A mixture having a fire-resistant and heat-insulating function according to any one of claims 1 to 3, wherein: the paint also comprises the following components in parts by mass:

6-9 parts of ceramic powder.

7. A mixture having a fire-resistant and heat-insulating function according to claim 1, wherein: the preparation method of the mixture with the functions of fire resistance and heat insulation comprises the following steps:

8. A mixture having a fire-resistant and heat-insulating function according to claim 7, wherein: dysprosium fluoride, neodymium fluoride, carbon fibers, zircon powder, fluorite powder and ceramic powder are also added in the step 2).