CN113735507A - Water-retaining heat-releasing anti-crack concrete and preparation method thereof - Google Patents

Abstract

The application relates to the field of concrete, and particularly discloses water-retaining heat-releasing anti-cracking concrete. The water-retaining heat-releasing anti-crack concrete comprises the following raw materials in parts by weight: 30-60 parts of crushed gravel, 10-20 parts of slag, 20-50 parts of cement, 3-9 parts of fluid heat-conducting silica gel, 3-6 parts of polypropylene water-absorbing resin, 2-5 parts of attapulgite and 50-120 parts of water; the application discloses anti crack concrete is because the addition of flow state heat conduction silica gel, when having the concrete curing and produce a large amount of hydration heat, can carry out the heat conduction to the concrete for the inside temperature difference of temperature and external temperature of concrete reduces, reduces the advantage of the risk of concrete fracture.

Description

Water-retaining heat-releasing anti-crack concrete and preparation method thereof

Technical Field

The application relates to the field of concrete, in particular to water-retaining heat-releasing anti-crack concrete and a preparation method thereof.

Background

The concrete is an artificial stone material which is prepared by mixing cement, water, sand and stones with each other, adding chemical additives and mineral admixtures if necessary, mixing according to a proper proportion, uniformly stirring, compacting, forming, curing and hardening. Concrete is mainly divided into a plastic state, namely fresh concrete or concrete mixture, and a hard state, namely hardened concrete.

In the related art, the concrete is changed from a plastic state to a hard state into four stages: 1. after the cement is added with water, the surfaces of cement particles can generate violent hydration reaction, and a large amount of heat is released to generate hydrate; 2. with the continuous progress of cement hydration reaction, heat release is continuously carried out, water is evaporated, a semi-transparent film layer is formed on the surface of cement particles, the infiltration of external water is reduced, the hydration reaction speed is reduced, and the process is called as a rest period; 3. hydration reaction is continuously increased, heat release is continuously carried out, water is evaporated, the thickness of a film layer is continuously increased, cement particles are mutually bonded to form concrete with a net structure, the plasticity of slurry is also reduced, the fluidity is gradually lost, the concrete begins to be coagulated, but the strength is not generated, and the process is called as a coagulation period; 4. throughout the development of the gel and crystals, hydration causes the pores in the network to be filled and the structure to gradually contract, and when a certain strength is achieved, i.e. the cement sets, it begins to shrink completely and sets to the end, which is called the hardening period.

In conclusion, the inventor believes that the problems that a large amount of heat is released in the cement hydration process, so that the temperature difference between the temperature of the concrete and the outside is large, a large amount of water is lost, the concrete is dehydrated, and the concrete is easy to crack exist.

Disclosure of Invention

In order to solve the problem that concrete is easy to crack in a curing stage, the application provides the water-retaining heat-releasing anti-cracking concrete and the preparation method thereof.

In a first aspect, the application provides a water-retaining heat-releasing anti-crack concrete, which adopts the following technical scheme:

the water-retaining heat-releasing anti-crack concrete is prepared from the following raw materials in parts by weight: 30-60 parts of broken gravel, 10-20 parts of slag, 20-50 parts of cement, 3-9 parts of fluid heat-conducting silica gel, 3-6 parts of polypropylene water-absorbing resin, 2-5 parts of attapulgite and 25-60 parts of water.

Through adopting above-mentioned technical scheme, the addition of flow state heat conduction silica gel for other raw materialss in the heat conduction silica gel of flow state and the concrete can the mix mixing, and when the concrete solidification produced a large amount of hydration heat, can carry out the heat conduction to the concrete, make the inside temperature difference of temperature and external temperature of concrete reduce, reduce the risk of concrete fracture. The polypropylene water-absorbing resin and the attapulgite are added, so that the polypropylene water-absorbing resin and the attapulgite can play a role in retaining water for concrete, the water in the concrete can not be dissipated too fast, and the concrete is prevented from cracking during the curing period; and because the inside of the attapulgite is provided with a large number of pore structures, substances with smaller particle sizes in the concrete can enter the attapulgite, the bonding force among all components in the concrete is enhanced, and the cracking of the concrete during the curing period is effectively prevented.

Optionally, 45-55 parts of crushed gravel, 15-20 parts of slag, 25-35 parts of cement, 5-7 parts of fluid heat-conducting silica gel, 4-6 parts of polypropylene water-absorbing resin, 3-4 parts of attapulgite and 30-50 parts of water.

By adopting the technical scheme, the component proportion of the concrete is further optimized, so that when the fluid heat-conducting silica gel is uniformly distributed in the concrete, the heat emitted when the concrete is cured can be conducted; and the fluid state heat conduction silica gel is suitable for the heat conduction degree of the concrete, so that the difference between the heat inside the concrete and the heat of the external environment is just not enough to crack the concrete, and the hydration reaction of the concrete is not influenced due to the rapid heat dissipation of the concrete because of the excessive heat conduction silica gel. The proper amount of the polypropylene water-absorbing resin and the attapulgite are matched with other components in the concrete, so that the water content in the concrete is controlled properly when the water is retained and released, and the concrete has certain compressive strength without cracking.

Optionally, the weight ratio of the fluid state heat conduction silica gel, the polypropylene water-absorbent resin and the attapulgite is as follows: 1: (0.8-1): (0.6-0.8).

Through adopting above-mentioned technical scheme, flow state heat conduction silica gel, the suitable ratio of polypropylene class water-absorbing resin and attapulgite, make in the concrete curing stage, heat conduction silica gel can in time derive the heat that the inside hydration reaction of concrete gived off, and can not influence the effect of keeping of polypropylene class water-absorbing resin and attapulgite to moisture in the concrete, promptly in the concrete curing stage, the difference in temperature of concrete self and external environment has been reduced promptly, the inside moisture content of concrete has also been guaranteed to be sufficient, and then the risk that the concrete takes place the fracture in the curing stage has been reduced.

Optionally, the fluid state heat conduction silica gel is one of epoxy resin heat conduction silica gel and organic silica gel heat conduction silica gel.

By adopting the technical scheme, different types of heat-conducting silica gel can be used for guiding out heat released by concrete in the hydration reaction process, and the epoxy resin heat-conducting silica gel and the organic silica gel heat-conducting silica gel are not only fluid heat-conducting silica gels, but also two fluid heat-conducting silica gels have relatively high heat conductivity coefficients in the viscoelastic heat-conducting silica gel; therefore, the epoxy resin heat-conducting silica gel and the organic silica gel heat-conducting silica gel can be highly bonded with other components in the concrete, and the high heat conductivity coefficient of the epoxy resin heat-conducting silica gel and the organic silica gel heat-conducting silica gel enables each part of the concrete to be uniformly and continuously radiated, so that the concrete is difficult to crack due to overlarge internal and external temperature difference in the curing process.

Optionally, the anti-crack concrete further comprises 0.5-1 part of waste rubber particles.

By adopting the technical scheme, the moisture in the concrete can be kept due to the water absorption and release performance of the polypropylene water-absorbing resin, and the concrete is difficult to crack due to a large amount of water loss in the curing stage. However, the polypropylene water-absorbent resin has large volume expansion after water absorption, the volume is reduced after water release, the volume change of the attapulgite and other components in the concrete is relatively small, and in order to prevent the influence of the volume change of the polypropylene water-absorbent resin on the concrete, the waste rubber particles are added into the concrete, so that the waste rubber particles adapt to the volume change of the polypropylene water-absorbent resin, the other components in the anti-crack concrete are difficult to be influenced by the volume change of the polypropylene water-absorbent resin, and the basic performances of the anti-crack concrete, such as compressive strength, elastic modulus and the like, are difficult to change.

Optionally, the weight ratio of the waste rubber particles to the polypropylene water-absorbent resin is as follows: (0.5-0.7): 1.

by adopting the technical scheme, the waste rubber particles and the polypropylene water-absorbent resin are in proper proportion, so that the amount of the waste rubber is just suitable for the volume of expansion and contraction of the polypropylene water-absorbent resin, and the compressive strength of the concrete is also ensured under the condition of ensuring the integral compactness of the concrete.

Optionally, the polypropylene-based water-absorbent resin is one of acrylic acid-based water-absorbent resin and acrylamide-based water-absorbent resin.

By adopting the technical scheme, the acrylic acid water-absorbing resin and the acrylamide water-absorbing resin both carry more hydrophilic groups, and the hydrophilic groups can absorb and store water in the concrete; when the inside wettability of concrete is lower, the polypropylene water-absorbing resin further releases the water stored in the concrete, so that the water demand in the concrete is met, and the risk of later-stage cracking of the concrete is reduced.

In a second aspect, the application provides a preparation method of the water-retaining heat-releasing anti-crack concrete, which adopts the following technical scheme:

s1, uniformly stirring polypropylene water-absorbent resin, attapulgite and heat-conducting silica gel in an aqueous solution to obtain an initial solution;

s2, adding cement and waste rubber particles into the initial solution, and uniformly stirring to obtain cement slurry;

and S3, adding the crushed gravel and the slag into the cement slurry, and uniformly stirring to obtain the anti-cracking concrete.

By adopting the technical scheme, the raw materials for preparing the concrete are added in three times, and the polypropylene water-absorbent resin with the smallest particle size, the attapulgite and the heat-conducting silica gel are uniformly mixed in water for the first time, so that the initial solution is a solution doped with the three substances; and finally, adding the crushed gravels and the slag with the largest volume into the cement slurry, so that the crushed gravels and the slag can be uniformly mixed in the cement slurry, and adopting a gradual addition method, so that the finally prepared anti-crack concrete slurry has high uniformity and the formed building plate has uniform anti-crack performance.

In summary, the present application has the following beneficial effects:

1. by adding the fluid heat-conducting silica gel, heat can be conducted on the concrete when a large amount of hydration heat is generated during concrete curing, so that the temperature difference between the internal temperature of the concrete and the external temperature is reduced, and the risk of concrete cracking is reduced;

2. the proper proportion of the fluid heat-conducting silica gel, the polypropylene water-absorbing resin and the attapulgite ensures that the heat dissipated by hydration reaction in the concrete is led out by the heat-conducting silica gel in the concrete curing stage, the water retention in the concrete by the polypropylene water-absorbing resin and the attapulgite is not influenced, and the cracking risk in the concrete curing stage is reduced;

3. the raw material adding step adopts a gradual adding method, so that the finally prepared anti-cracking concrete slurry has high uniformity, and the formed building plate has uniform anti-cracking performance.

Detailed Description

The present application will be described in further detail with reference to examples.

The raw material sources are as follows: sodium polyacrylate water-absorbent resin, polyacrylamide water-absorbent resin, purchased from Henan Ding Xiang chemical products Co.Ltd; polyacrylonitrile potassium salt water-absorbent resin (K-HPAN), purchased from volitan petroleum science and technology development ltd, gansu; attapulgite and waste rubber particles purchased from processing plants of Xuanguan mineral products in Lingshu county; silicone rubber thermal silica gel (model: ceramic xi 184), purchased from England technologies, Inc., Shenzhen; epoxy resin heat-conducting silica gel (model: 7063) available from drastic new material technology ltd of Dongguan; solid heat-conducting silica gel (model: ZY-850A) available from Dongguan New east science and technology Co., Ltd; portland cement, purchased from dry and rich mineral processing plants in Lingshou county; crushed gravel and iron ore sand purchased from a mica factory located far from Lingshou county.

Examples of crack resistant concrete

Example 1

S1, stirring 3kg of sodium polyacrylate water-absorbing resin, 5kg of attapulgite and 9kg of organic silicon rubber heat-conducting silica gel in 50kg of aqueous solution at the speed of 100rpm/min for 5min to obtain initial solution;

s2, adding 30kg of Portland cement and 0.5g of waste rubber particles into the initial solution, and stirring at the speed of 50rpm/min for 15min to obtain cement slurry;

and S3, adding 50kg of crushed gravel and 18kg of iron ore slag into the cement slurry, and stirring at the speed of 20rpm/min for 5min to finally prepare the anti-crack concrete.

Example 2

S1, stirring 6kg of sodium polyacrylate water-absorbing resin, 2kg of attapulgite and 3kg of organic silicon rubber heat-conducting silica gel in 120kg of aqueous solution at the speed of 100rpm/min for 5min to obtain initial solution;

s2, adding 30kg of Portland cement and 1g of waste rubber particles into the initial solution, and stirring at the speed of 50rpm/min for 15min to obtain cement slurry;

and S3, adding 50kg of crushed gravel and 18kg of iron ore slag into the cement slurry, and stirring at the speed of 20rpm/min for 5min to finally prepare the anti-crack concrete.

Example 3

S1, stirring 4kg of sodium polyacrylate water-absorbing resin, 4kg of attapulgite and 7kg of organic silicon rubber heat-conducting silica gel in 60kg of aqueous solution at the speed of 100rpm/min for 5min to obtain initial solution;

s2, adding 30kg of Portland cement and 0.5kg of waste rubber particles into the initial solution, and stirring at the speed of 50rpm/min for 15min to obtain cement slurry;

and S3, adding 50kg of crushed gravel and 18kg of iron ore slag into the cement slurry, and stirring at the speed of 20rpm/min for 5min to finally prepare the anti-crack concrete.

Example 4

S1, stirring 6kg of sodium polyacrylate water-absorbing resin, 3kg of attapulgite and 5kg of organic silicon rubber heat-conducting silica gel in 70kg of aqueous solution at the speed of 100rpm/min for 5min to obtain initial solution;

s2, adding 30kg of Portland cement and 1kg of waste rubber particles into the initial solution, and stirring at the speed of 50rpm/min for 15min to obtain cement slurry;

and S3, adding 50kg of crushed gravel and 18kg of iron ore slag into the cement slurry, and stirring at the speed of 20rpm/min for 5min to finally prepare the anti-crack concrete.

Example 5

S1, stirring 5kg of sodium polyacrylate water-absorbing resin, 4kg of attapulgite and 6kg of organic silicon rubber heat-conducting silica gel in 80kg of aqueous solution at the speed of 100rpm/min for 5min to obtain initial solution;

s2, adding 30kg of Portland cement and 1kg of waste rubber particles into the initial solution, and stirring at the speed of 50rpm/min for 15min to obtain cement slurry;

and S3, adding 50kg of crushed gravel and 18kg of iron ore slag into the cement slurry, and stirring at the speed of 20rpm/min for 5min to finally prepare the anti-crack concrete.

Example 6

The difference from example 5 is that: in step S1, 5kg of silicone rubber heat-conducting silica gel is added.

Example 7

The difference from example 5 is that: in step S1, 7kg of silicone rubber heat-conducting silica gel is added.

Example 8

The difference from example 5 is that: step S1, adding 6.8kg of sodium polyacrylate water-absorbent resin, 4.8kg of attapulgite and 3.4kg of silicone rubber heat-conducting silica gel, that is, the weight ratio of the sodium polyacrylate water-absorbent resin, the attapulgite and the silicone rubber heat-conducting silica gel is 1: 0.7: 0.5.

example 9

The difference from example 5 is that: step S1, adding 6.25kg of sodium polyacrylate water-absorbent resin, 4.375kg of attapulgite and 4.375kg of silicone rubber heat-conducting silica gel, that is, the weight ratio of the sodium polyacrylate water-absorbent resin, the attapulgite and the silicone rubber heat-conducting silica gel is 1: 0.7: 0.7.

example 10

The difference from example 5 is that: step S1, adding 6.52kg of sodium polyacrylate water-absorbent resin, 4.57kg of attapulgite and 3.91kg of silicone rubber heat-conducting silica gel, that is, the weight ratio of the sodium polyacrylate water-absorbent resin, the attapulgite and the silicone rubber heat-conducting silica gel is 1: 0.7: 0.6.

example 11

The difference from example 5 is that: step S1, adding 5.75kg of sodium polyacrylate water-absorbent resin, 5.75kg of attapulgite and 3.5kg of silicone rubber heat-conducting silica gel, that is, the weight ratio of the sodium polyacrylate water-absorbent resin, the attapulgite and the silicone rubber heat-conducting silica gel is 1: 1: 0.6.

example 12

The difference from example 5 is that: step S1, adding 6.25kg of sodium polyacrylate water-absorbent resin, 5kg of attapulgite and 3.75kg of silicone rubber heat-conducting silica gel, that is, the weight ratio of the sodium polyacrylate water-absorbent resin, the attapulgite and the silicone rubber heat-conducting silica gel is 1: 0.8: 0.6.

example 13

The difference from example 12 is that: step S1, adding 5.45kg of sodium polyacrylate water-absorbing resin; step S2, adding 0.55kg of waste rubber particles, that is, the weight ratio of the sodium polyacrylate water-absorbing resin to the waste rubber particles is 1: 0.1.

example 14

The difference from example 12 is that: step S1, adding 5.08kg of sodium polyacrylate water-absorbing resin; step S2, adding 0.92kg of waste rubber particles, that is, the weight ratio of the sodium polyacrylate water-absorbing resin to the waste rubber particles is 1: 0.18.

example 15

The difference from example 12 is that: step S1, adding 5.12kg of sodium polyacrylate water-absorbing resin; step S2, adding 0.78kg of waste rubber particles, that is, the weight ratio of the sodium polyacrylate water-absorbing resin to the waste rubber particles is 1: 0.15.

example 16

The difference from example 14 is that: in step S1, the equal weight of the sodium polyacrylate water absorbent resin is replaced with the equal weight of the polyacrylamide water absorbent resin.

Example 17

The difference from example 14 is that: in step S1, the silicone rubber heat conductive silicone rubber is replaced with epoxy resin heat conductive silicone rubber of equal weight.

Example 18

The difference from example 14 is that: in step S1, the equal weight of polyurethane heat-conducting silica gel is used to replace the equal weight of silicone rubber heat-conducting silica gel.

Example 19

The difference from example 14 is that: in step S1, the equal weight of sodium polyacrylate water absorbent resin was replaced with the equal weight of polyacrylonitrile potassium salt water absorbent resin.

Example 20

The difference from example 14 is that: in step S2, no waste rubber particles are added.

Comparative example 1

The difference from example 14 is that: in step S1, 11.33kg of sodium polyacrylate water-absorbent resin was added without adding silicone rubber heat-conductive silica gel.

Comparative example 2

The difference from example 14 is that: in step S1, 11.33kg of silicone rubber heat-conducting silicone rubber was added without adding the sodium polyacrylate water-absorbing resin.

Comparative example 3

The difference from example 14 is that: in step S1, attapulgite is not added.

Comparative example 4

The difference from example 14 is that: step S1 does not add waste rubber particles.

Comparative example 5

The difference from example 14 is that: in step S1, the silicone rubber heat conductive silicone rubber is replaced by the solid heat conductive silicone rubber with the same weight.

Performance test

The crack-resistant concretes prepared in examples 1 to 20 and comparative examples 1 to 5 were subjected to a performance test.

Crack resistance test

According to the specification in the technical Specification for crack control in construction engineering (JKGJ/T317-2014), the evaluation of cracks is carried out according to the following three parameters of the crack area method, and the concrete is graded according to the following specification according to crack parameters.

1. The average cracking area a is less than 10mm²；

2. The number b of cracks per unit area is less than 10 pieces/m²；

3. The area ratio c of the crack is less than 100mm²/m²。

The concrete crack resistance is divided into the following five grades according to the evaluation limit:

grade I, no crack or only fine crack is formed on the test piece;

II, all the inspection data do not exceed the evaluation limit;

class III, one of the three test data exceeds the evaluation limit;

IV, two of the three inspection data exceed the evaluation limit;

and V, all three test data exceed the evaluation limit.

For the concrete of class IV and class V, it was evaluated that the crack resistance was poor. The results are shown in Table 1.

TABLE 1

Basic performance measurement setting time: testing the initial setting time and the final setting time according to the standard FB/T1346-2011; compressive strength: the performance test of the 3d and 28d standards is carried out according to KGB/T17671-1999, and the water precipitation rate test is as follows: testing by adopting a standard measuring cylinder, wherein when the inorganic grouting material is initially set, the volume of water in the measuring cylinder is occupied; (curing conditions: the temperature of the curing experiment was room temperature, and the test results were shown in Table 2, with curing humidity of 90% and humidity of 20 ℃ C.) in a standard curing box.

TABLE 2

The detection results of the examples 1 to 20 all meet the requirements of the concrete foundation performance.

By combining the examples 1, 2, 3, 4 and 5, it can be seen that the raw material ratios of the anti-crack concrete are only adjusted in the examples 1, 2, 3, 4 and 5, the raw material ratios of the examples 1 and 2 are further optimized in the examples 3, 4 and 5, and the optimized performances, especially the anti-crack performance, of the examples 3, 4 and 5 are all better, so that the anti-crack performance is better improved, the crack area is smaller, wherein the crack area ratio in the example 5 is the smallest, and the anti-crack performance is the best.

Combining examples 5, 6 and 7, it can be seen that the only variable in examples 5, 6 and 7 is the addition amount of the silicone rubber, and from the data structure, it was found that when the addition amount of the silicone rubber was 6g, the crack resistance of the resulting crack resistant concrete was superior to examples 6 and 7, and therefore the addition amount of the silicone rubber in example 5 was appropriate.

With reference to examples 8, 9, 10, 11 and 12, it can be seen that the amounts of the sodium polyacrylate water-absorbent resin, the attapulgite and the silicone rubber heat-conducting silica gel, which have an influence on the crack resistance of concrete, in examples 8, 9, 10, 11 and 12 are adjusted, and the proportions are as follows: 1/0.7/0.5; 1/0.7/0.7; 1/0.7/0.6; 1/1/0.6; 1/0.8/0.6, the performances of the anti-crack concrete with the proper proportion range of the dosage ratios of the three substances are all improved, the anti-crack grade is I grade, the proportion in the embodiment 12 is the optimal proportion, and the anti-crack performance of the prepared anti-crack concrete is superior to that of the anti-crack concrete in the embodiments 8, 9, 10 and 11.

With reference to examples 13, 14 and 15, it can be seen that examples 13, 14 and 15 adjust the amounts of the sodium polyacrylate water-absorbent resin and the waste rubber particles, and the proportions are as follows: 1/0.1; 1/0.18; 1/0.15, the anti-cracking concrete with optimized dosage of the two substances has improved various performances, the anti-cracking grade is I grade, the mixture ratio in the embodiment 14 is the optimal mixture ratio, and the anti-cracking performance of the prepared anti-cracking concrete is superior to that of the anti-cracking concrete in the embodiments 13 and 15.

By combining the examples 16 and 14, it can be seen that the crack-resistant concrete prepared by using the sodium polyacrylate water-absorbent resin and the polyacrylamide water-absorbent resin has better performances.

By combining example 17 and example 14, it can be seen that the properties of the anti-crack concrete prepared by using the epoxy resin heat-conducting silica gel are slightly inferior to those of the anti-crack concrete finally prepared by using the silicone rubber heat-conducting silica gel.

By combining example 18 and example 14, it can be seen that the crack resistance grade of the crack resistant concrete prepared by adding the polyurethane heat conductive silicone rubber is class ii, but the crack resistance effect is not as good as that of the crack resistant concrete prepared by example 14.

By combining the example 19 and the example 14, it can be seen that the anti-crack concrete prepared by using the polyacrylonitrile potassium salt water-absorbing resin has poorer anti-crack performance than the anti-crack concrete prepared by using the sodium polyacrylate water-absorbing resin.

Combining example 20 with example 14, it can be seen that the crack resistance of the crack resistant concrete without adding the waste rubber is poor.

By combining comparative examples 1 and 5 and example 14, it can be seen that the crack resistance grade of the crack-resistant concrete prepared without adding the silicone rubber heat-conducting silica gel is V grade; the crack resistance grade of the crack resistant concrete prepared by adding the solid heat conductive silica gel is grade III, and the crack resistance effect is not as good as that of the crack resistant concrete prepared in the embodiment 14.

Combining comparative examples 2 and 3 and example 14, it can be seen that the crack resistance of the crack-resistant concrete is poor without adding the sodium polyacrylate water-absorbent resin and the attapulgite.

Combining comparative example 4 and example 14, it can be seen that the crack resistance of the crack-resistant concrete without adding the waste rubber particles is poor, and the compressive strength is poor.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims (8)

1. The water-retaining heat-releasing anti-crack concrete is characterized by being prepared from the following raw materials in parts by weight: 30-60 parts of broken gravel, 10-20 parts of slag, 20-50 parts of cement, 3-9 parts of fluid heat-conducting silica gel, 3-6 parts of polypropylene water-absorbing resin, 2-5 parts of attapulgite and 50-120 parts of water.

2. The water-retaining and heat-releasing anti-crack concrete as claimed in claim 1, wherein the concrete comprises 45-55 parts of broken gravel, 15-20 parts of slag, 25-35 parts of cement, 5-7 parts of fluidized heat-conducting silica gel, 4-6 parts of polypropylene water-absorbing resin, 3-4 parts of attapulgite and 60-80 parts of water.

3. The water-retaining and heat-releasing anti-crack concrete as claimed in claim 1, wherein the weight ratio of the fluid heat-conducting silica gel, the polypropylene water-absorbing resin and the attapulgite is as follows: 1: (0.7-1): (0.5 to 0.7).

4. The water-retaining and heat-releasing anti-crack concrete as claimed in claim 1, wherein the fluid state heat-conducting silica gel is one of epoxy resin heat-conducting silica gel and silicone rubber heat-conducting silica gel.

5. The water-retaining and heat-releasing anti-crack concrete as claimed in claim 1, further comprising 0.5-1 part of waste rubber particles.

6. The water-retaining heat-releasing crack-resistant concrete as claimed in claim 5, wherein the weight ratio of the waste rubber particles to the polypropylene water-absorbing resin is as follows: (0.1-0.18): 1.

7. the water-retaining heat-releasing crack-resistant concrete according to claim 1, wherein the polypropylene-based water-absorbent resin is one of an acrylic acid-based water-absorbent resin and an acrylamide-based water-absorbent resin.

8. The preparation method of the water-retaining heat-releasing crack-resistant concrete as claimed in any one of claims 1 to 7, which is characterized by comprising the following preparation steps:

s1, uniformly stirring polypropylene water-absorbent resin, attapulgite and fluid heat-conducting silica gel in an aqueous solution to obtain an initial solution;

s2, adding cement and waste rubber particles into the initial solution, and uniformly stirring to obtain cement slurry;

and S3, adding the crushed gravel and the slag into the cement slurry, and uniformly stirring to obtain the anti-cracking concrete.