CN113199593A

CN113199593A - Process for preparing high-strength modified sulfur concrete by cold water bath vibration forming method

Info

Publication number: CN113199593A
Application number: CN202110545259.4A
Authority: CN
Inventors: 欧阳东; 林文伟
Original assignee: Jinan University
Current assignee: Jinan University
Priority date: 2021-05-19
Filing date: 2021-05-19
Publication date: 2021-08-03
Anticipated expiration: 2041-05-19
Also published as: CN113199593B

Abstract

The invention belongs to the technical field of building materials, and particularly relates to a process for preparing high-strength modified sulfur concrete by a cold water bath vibration forming method, which is mainly applied to the die filling and forming stage of the sulfur concrete, can improve the compactness of a sulfur matrix to a greater extent, namely avoid the adverse effect of holes formed by cooling and shrinking the sulfur matrix on the strength, and has the advantages of simple and convenient operation and simple device manufacture; tests show that the modified sulfur concrete prepared by the method has the minimum compressive strength of 77MPa, few holes in test blocks, high compactness, low strength dispersion among the test blocks and stable compressive strength. Meanwhile, the invention also optimizes the optimal proportion of the sulfur concrete premix before the die filling and molding stage, and the compressive strength of the modified sulfur concrete prepared by combining the optimal proportion of the sulfur concrete and the cold bath vibration molding process can reach 87MPa on average.

Description

Process for preparing high-strength modified sulfur concrete by cold water bath vibration forming method

Technical Field

The invention belongs to the technical field of building materials, and particularly relates to a process for preparing high-strength modified sulfur concrete by a cold water bath vibration forming method.

Background

The sulfur concrete is a novel sustainable building material formed by mixing sulfur, mineral filler and aggregate, and is also called sulfur concrete. Different from the traditional silicate concrete, the sulfur is used as a binder and is neither hydraulic nor air-hardening material, and the hardening principle is the cooling crystallization of the sulfur and belongs to physical change. Therefore, the hardening process is very fast, the material can be hardened and formed after being cooled for several minutes at normal temperature, and the final strength of the substrate can be approached after several hours, so that the material is an excellent early-strength material.

The sulfur concrete has higher compressive strength, the compressive strength of the modified pure sulfur is up to 30MPa, the flexural strength is 3.5MPa, and the compressive strength can reach 87.2MPa after the modified pure sulfur is mixed with the filler and the aggregate to prepare the concrete. Besides good mechanical properties, the sulfur concrete also has extremely high impermeability, acid and salt corrosion resistance, and has excellent application prospect in projects with severe environment. In addition, based on the physical properties of sulfur, the high temperature can lead the cured sulfur concrete to recover plasticity, which is sustainable embodiment.

Although sulfur concrete has excellent mechanical properties and durability, the preparation process is complex and has certain dangers. The traditional preparation process needs oil bath for heat preservation and stirring, and the modifier has certain toxicity in the preparation process and can cause harm to human bodies, which is also the reason why the material is not researched much in China at present. Meanwhile, the volume shrinkage generated during the cooling of the sulfur is a serious problem at present, and a sample prepared by the traditional process has large discrete mechanical property and more holes on a substrate. Therefore, in order to better research and develop the novel material, the existing preparation process must be improved to improve the mechanical properties thereof so that the mechanical properties thereof are stable and excellent.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a process for preparing high-strength modified sulfur concrete by a cold water bath vibration forming method, and the process can greatly reduce holes formed by sulfur shrinkage, so that the modified sulfur concrete with high compactness, excellent mechanical property and stability is obtained.

In order to achieve the purpose, the invention adopts the technical scheme that:

the invention provides a process for preparing high-strength modified sulfur concrete by a cold water bath vibration forming method, wherein the modified sulfur concrete comprises the following components in percentage by mass:

11.5 to 14.2 percent of modified sulfur, 11.5 to 14.2 percent of filler, 22 to 30 percent of common river sand and 42.6 to 51.0 percent of aggregate mixture; the modified sulfur comprises 97% of sulfur and 3% of dicyclopentadiene, the filler comprises but is not limited to cement, slag and fly ash, the aggregate mixture comprises 5mm-9mm granite broken stone and 10mm-15mm granite broken stone, and the mass ratio of the 5mm-9mm granite broken stone to the 10mm-15mm granite broken stone is 3: 1;

the preparation process of the modified sulfur concrete comprises the following steps:

s1, pretreatment of the materials:

s11, pre-dry-mixing the river sand and the filler for 1-2 minutes to obtain a river sand-filler mixture;

s12, preheating the sulfur, the river sand-filler mixture and the aggregate mixture at the temperature of 135 ℃ and 145 ℃ for 1-2 hours;

s13, adding dicyclopentadiene into the preheated and melted sulfur, and reacting to obtain modified sulfur;

s14, sequentially pouring the river sand-filler mixture and the aggregate mixture into the modified sulfur to obtain a sulfur concrete premix;

s15, placing the stirred sulfur concrete premix back to the temperature of 135 ℃ plus 145 ℃ for heat preservation for 10 minutes, and increasing the temperature of the concrete to the temperature of 135 ℃ plus 145 ℃ to obtain the sulfur concrete to be molded;

s2, performing mould filling and forming through a cold water bath vibration forming method:

the cold water bath vibration forming method needs a vibration device, a water tank, an opening baffle and a mold, wherein the area of the opening baffle is larger than that of the water tank, and a hole which is in accordance with the size of the mold is formed in the middle of the opening baffle;

s21, rapidly pouring the sulfur concrete to be molded in the step S15 into a mold under the vibration state of a vibration device, and filling the mold and vibrating for 30-60S;

s22, after initial vibration compaction, leveling the surface of the concrete, placing the mould in a water tank, and injecting water with the height of 1/5-1/4;

s23, sleeving a baffle on the edge of the mold, and completely shielding the redundant surface of the water tank;

and S24, starting the vibration device, fixing a baffle plate to prevent displacement, closing the vibration device after the color of the upper surface of the sulfur concrete changes from dark green to light green, taking out the mold, standing for 1-2 hours, and removing the mold to obtain the modified sulfur concrete.

Preferably, the modified sulfur concrete comprises the following components in percentage by mass:

13.3 percent of modified sulfur, 13.3 percent of cement, 24.9 percent of common river sand, 36.4 percent of granite broken stone with the grain diameter of 5mm-9mm and 12.1 percent of granite broken stone with the grain diameter of 10mm-15 mm; the modified sulfur comprises 97% of sulfur and 3% of modifier dicyclopentadiene.

Preferably, in step S12, the preheating temperature is 140 ℃ and the time is 1 hour.

Preferably, in step S13, the reaction temperature is 135-145 ℃ and the reaction time is 2-3 hours. Further, the reaction temperature was 140 ℃ and the reaction time was 2 hours.

Preferably, the water tank and the mold are subjected to the preheating treatment in step S12 together with sulfur, river sand-filler mixture, and aggregate mixture before use.

Preferably, in step S14, the river sand-filler mixture is added to the modified sulfur in two portions, each for 30 seconds, and then the aggregate mixture is added in 2 portions, each for 30 seconds, to obtain the sulfur concrete premix.

Preferably, the vibration device includes, but is not limited to, a vibration table, a vibration rod. Further, the vibration device is a vibration table.

Compared with the prior art, the invention has the beneficial effects that:

aiming at the defects that the existing preparation process of the sulfur concrete is complex, the prepared sample has large discrete type mechanical property, more holes on a substrate, unstable and excellent mechanical property and the like, the invention provides the cold bath vibration forming process of the modified sulfur concrete, which is mainly applied to the die filling and forming stage of the sulfur concrete, can improve the compactness of the sulfur substrate to a greater extent, namely, avoids the adverse effect of the holes formed by cooling and shrinking the sulfur substrate on the strength, and has simple and convenient operation and simple device manufacture; tests show that the modified sulfur concrete prepared by the method has the minimum compressive strength of 77MPa, few holes in test blocks, high compactness, low strength dispersion among the test blocks and stable compressive strength. Meanwhile, the optimum proportion of the sulfur concrete premix before the die filling and forming stage is optimized, the compressive strength of the modified sulfur concrete prepared by combining the optimum proportion of the sulfur concrete and the cold bath vibration forming process is up to 87MPa on average, and the compressive strength of part of test blocks is over 90 MPa.

In detail, the invention has the following advantages:

(1) the device used in the cold water bath vibration forming process is simple, and a common iron water tank and a concrete vibration device can be sufficient;

(2) the modified sulfur concrete prepared by the cold water bath vibration forming process has few internal holes and high substrate compactness;

(3) the modified sulfur concrete prepared by the cold water bath vibration forming process has the lowest compressive strength of 77MPa, low strength discreteness among test blocks and more stable compressive strength than a test sample prepared by a common forming method;

(4) by adopting the mixing proportion of the high-strength sulfur concrete, a sample with the compressive strength of 87MPa can be prepared, and the compressive strength of part of test blocks is over 90 MPa;

(4) compared with the traditional process, the sulfur concrete has higher hardening speed, is initially hardened and formed within a few minutes, and can be demoulded; 80% of the final strength can be achieved within a few hours, and standard maintenance conditions are not needed, so that great significance is brought to engineering emergency;

(5) the modified sulfur concrete prepared by the cold water bath vibration forming process has better permeability resistance, acid and salt corrosion resistance, and is suitable for ocean engineering, chemical engineering construction, urban pipeline repair and the like. And the coating has better freezing resistance, can be constructed in a low-temperature environment, does not need water for preparation and maintenance, and is an excellent alternative scheme for arid water-deficient areas.

(6) The modified sulfur concrete prepared by the cold water bath vibration forming process is a green sustainable material, the main material sulfur powder is a byproduct of most industries, the source is rich, the aggregate can use artificial sand and recycled aggregate, the influence on the performance is little, the plasticity of the sulfur concrete can be recovered after the sulfur concrete is hardened and formed and the sulfur concrete has good sustainable utilization performance.

(7) The sulfur concrete is a novel conforming material which is the most probable material to become a space building material at present, has extremely high Mars environmental adaptability, and is relatively simple to prepare based on local materials of Mars.

(8) Besides the advantages, the sulfur concrete of the invention has the characteristics of common portland cement concrete.

Drawings

FIG. 1 is a diagram of the actual operation of the modified sulphur concrete cold water bath vibration forming process;

FIG. 2 shows modified sulfur concrete samples prepared by a conventional molding method (A) and a cold water bath vibration molding method (B);

FIG. 3 is a process of the sustainability test of modified sulphur concrete.

Detailed Description

The following further describes the embodiments of the present invention. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

The experimental procedures in the following examples were carried out by conventional methods unless otherwise specified, and the test materials used in the following examples were commercially available by conventional methods unless otherwise specified.

Example 1 establishment and optimization of high-strength modified sulphur concrete cold water bath vibration molding process

Establishment of modified sulfur concrete cold water bath vibration forming process

The modified sulfur concrete comprises the following components in percentage by mass:

11.5 to 14.2 percent of modified sulfur, 11.5 to 14.2 percent of filler (P.O.42.5 mineral filler such as cement, slag, fly ash and the like), 22 to 30 percent of common river sand, and 42.6 to 51.0 percent of aggregate mixture (granite macadam with the grain diameter of 5 to 9mm and granite macadam with the grain diameter of 10 to 15mm is 3:1 (mass ratio)); the modified sulfur comprises 97% of sulfur and 3% of modifier dicyclopentadiene.

The preparation method comprises the following specific steps:

1. pretreatment of materials

1.1, weighing corresponding amounts of filler, river sand, an aggregate mixture (granite macadam with the particle size of 5-9mm and granite macadam with the particle size of 10-15 mm), sulfur and a modifier dicyclopentadiene according to the proportion;

1.2, pre-dry-mixing the river sand and the filler for 1 minute to obtain a river sand-filler mixture;

1.3, putting the sulfur, the river sand-filler mixture, the aggregate mixture and a small metal cylinder (the diameter is 15cm-20cm, the height is at least 20cm) for containing materials and a triple steel mould (namely, one mould is 3 samples of 7.07 multiplied by 7.07, the thickness of the long side of the mould is approximately 23cm) of 7.07 multiplied by 7.07cm in a constant-temperature drying box at 140 ℃ for preheating for one hour, and preventing the temperature from being too low, so that the edge of the freshly-mixed sulfur concrete slurry is instantly hardened when poured;

1.4, adding a dicyclopentadiene modifier (colloidal solid at normal temperature) into the melted sulfur, uniformly stirring by using a fine iron rod, and placing the mixture in a constant-temperature drying box at 140 ℃ for reacting for 2 hours to obtain modified sulfur (in the step and the subsequent steps, protective measures are needed, dicyclopentadiene is preheated and is volatile and has certain toxicity);

1.5, pouring the modified sulfur into a preheated small metal cylindrical container, adding the preheated river sand-filler mixture into the small metal cylindrical container twice, and stirring the mixture for 30 seconds (400r/min) for 1 minute; then adding the mixed aggregate into the mixture in 2 times in the same way, and stirring the mixture for 30 seconds (400r/min) for 1 minute to obtain the freshly-mixed sulfur concrete slurry.

1.6, putting the stirred sulfur concrete premix back into a heat preservation box at 140 ℃, preserving heat for 20 minutes, and ensuring that the temperature of the fresh slurry is kept at about 140 ℃ during mold filling (because the temperature of the slurry is reduced in the stirring process, the slurry begins to harden before pouring and is difficult to fill the mold due to uncontrolled temperature), thereby obtaining the sulfur concrete to be molded (namely the fresh sulfur concrete or the fresh slurry).

2. Through cold water bath vibration forming method

The cold water bath vibration forming method needs a concrete vibration table (Hebei Huahui valve Limited, model HZJ-0.5), a firm water tank (size is 80cm multiplied by 40cm multiplied by 4cm), a rectangular opening baffle (size is 90cm multiplied by 45cm, material can be steel plate or acrylic plate), the water tank can be completely covered, the size of the opening inside the baffle is about 23cm multiplied by 7.5cm, and the opening is slightly larger than a mold.

As shown in fig. 1, the specific operation steps are as follows:

2.1, placing the preheated steel mould (step 1.2) on a vibration table, starting the vibration table (the vibration frequency is 2860 times/minute), quickly pouring the sulfur concrete to be molded into the steel mould, and vibrating for 30 seconds;

2.2, after initial vibration compaction, using a preheated iron trowel to trowel the surface of the concrete, quickly placing a water tank on a vibration table, placing a mold in the water tank, and injecting tap water with the height of 1/5-1/4;

2.3, sleeving a baffle on the edge of the mold, and completely shielding the redundant surface of the water tank; after the vibration table is started, water splash in the water tank is very easy to splash on the upper surface of the freshly mixed sulfur slurry, so that the sulfur on the water tank is instantly hardened, a baffle needs to be added to completely shield the water tank, and the water splash can be effectively prevented from splashing on the upper surface of the freshly mixed sulfur slurry.

And 2.4, opening the vibration table, and manually fixing a baffle to prevent displacement.

And 2.5, after the upper surface of the sulfur concrete is hardened, marking that the color is changed from dark green to light green, closing the vibration table, taking out the mold, standing for 1 hour in a natural environment, and removing the mold to obtain the modified sulfur concrete block.

Second, optimization of modified sulfur concrete cold water bath vibration forming process

1. Influence of traditional forming process and cold water bath vibration forming process on mechanical property of modified sulfur concrete

Preparing 3 cubic test blocks (respectively marked as T1, T2 and T3) with the sizes of 70.7mm multiplied by 70.7mm according to the component proportion and the dosage (the mass percentage of each component and the corresponding dosage) shown in the tables 1 and 2 and the cold water bath vibration molding process (the method in the establishment of the modified sulfur concrete cold water bath vibration molding process); meanwhile, 3 cubic test blocks (also marked as T1, T2 and T3) with the size of 70.7mm multiplied by 70.7mm are also prepared by the traditional forming process (namely a common cooling forming method, namely the method is that the freshly mixed sulfur concrete is directly poured into a preheated steel die, vibrated for 1 minute on a vibrating table and then solidified at normal temperature), and the compression strength of the test blocks is tested by a microcomputer hydraulic tester after the test blocks are cooled for 3 days in natural environment. In the table, the modified sulfur is obtained by reacting 97% of pure sulfur powder and 3% of dicyclopentadiene modifier, the broken stone 1 is granite broken stone with the particle size of 5-9mm, the broken stone 2 is granite broken stone with the particle size of 10-15mm, and fly ash is used as a filler.

As shown in the experimental results in Table 3, the strength of the test block obtained by the cold water bath vibration molding method is 81.4MPa at most and 75.7MPa at least, and the difference between the same groups is 9.8MPa (T1) at most, while the strength of the test block obtained by the common cooling molding method is 60.4MPa at most and 41.0MPa at most, and the difference between the same groups is 13.8MPa at most. Therefore, the cold water bath vibration forming method not only obviously improves the compression strength of the test blocks, but also reduces the strength difference among the test blocks in each group, namely, the discrete degree of the strength is reduced, and the mechanical property is more stable.

Fig. 2 is a solid diagram of a sulfur concrete sample prepared by a traditional forming method and a cold water bath vibration forming method respectively, and observation shows that the surface of the sample prepared by the traditional method has a plurality of irregular holes, so that the mechanical property of the sample is greatly reduced. The sample prepared by the cold water bath vibration forming method has uniform and flat surface and almost no holes, which shows that the forming method can effectively improve the compactness of the matrix and reduce the number and volume of sulfur shrinkage holes.

TABLE 1 proportion of modified sulphur concrete

Unit: wt%

Numbering	Modified sulfur	Fly ash	River sand	Crushed stone 1	Crushed stone 2
						T1	13.9	12.7	24.9	36.4	12.1
T2	13.3	13.3	24.9	36.4	12.1
						T3	12.7	13.9	24.9	36.4	12.1

TABLE 2 amount of each component of modified sulfur concrete (corresponding to the ratio in TABLE 1)

Unit: kg/m³

TABLE 3 compressive Strength of modified Sulfur concrete test blocks

Unit: MPa of

Meanwhile, taking a modified sulfur concrete test block prepared by a cold water bath vibration forming method in the T1 group as an example, the sustainable utilization characteristic of the modified sulfur concrete is tested. The specific method is (as shown in figure 3): roughly crushing 3 modified sulfur concrete samples subjected to mechanical property test in T1 group by using an iron hammer, then placing the samples into an iron cylinder, placing the cylinder into a constant-temperature drying box at 140 ℃ for heating for 120 minutes, pouring the heated sulfur concrete slurry into a mold again, pouring the slurry into the mold again by using a cold water bath vibration forming method, testing the compressive strength of the formed samples, and inspecting whether the sulfur concrete obtains plasticity again.

As shown in Table 4, the modified sulfur concrete returned to the state before molding after reheating and had good plasticity, which is a characteristic that cement concrete does not have. The compressive strength of the sample after primary forming by using a cold bath vibration process is 75.7MPa (see table 3), while the compressive strength measured after secondary forming by using the cold bath vibration process is 64.5MPa, although the strength is reduced by 14.8 percent compared with that of the primary forming, the sample still has good compressive performance, and simultaneously, the modified sulfur concrete of the invention is well proved to have good sustainable utilization.

Compressive Strength of the modified Sulfur concrete samples of Table 4T 1 after Re-Molding

Unit: MPa of

2. Influence of mineral filler type and filler mixing amount on mechanical property of modified sulfur concrete

According to the component proportion and the amount (the mass percentage of each component and the corresponding amount) shown in tables 5-10, three test blocks with the sizes of 70.7mm multiplied by 70.7mm are prepared according to the cold water bath vibration forming process (the method in the establishment of the modified sulfur concrete cold water bath vibration forming process), and then the mechanical property is tested through a microcomputer hydraulic test to calculate the average value. The three selected fillers are fly ash, cement (P.O.42.5 cement) and slag which are widely used and easily obtained at present, 3 groups of the fillers are arranged, the broken stone 1 is granite broken stone with the particle size of 5-9mm, the broken stone 2 is granite broken stone with the particle size of 10-15mm, the ratio of sulfur to the fillers of each group is different, and the materials of the other components are unchanged.

As shown in table 11, the compressive strength test results show that the strength of the modified sulfur concrete doped with cement filler is 86.9Mpa, the overall strength of the cement doped with the filler is higher than that of fly ash and slag, and the mass ratio of the modified sulfur to the filler is 1: 1, namely when the mixing amount of the cement is 13.3 percent, the mechanical property of the modified sulfur concrete is optimal.

TABLE 5 formulation of modified Sulfur concrete doped with fly ash

Unit: wt%

TABLE 6 dosage of the modified sulfur concrete with fly ash (corresponding to the ratio in TABLE 5)

Unit: kg/m³

TABLE 7 formulation of modified sulphur concrete doped with cement

Unit: wt%

TABLE 8 dosage of each component of the modified sulfur concrete doped with cement (corresponding to the ratio in TABLE 7)

Unit: kg/m³

TABLE 9 slag-doped modified Sulfur concrete mixture ratio

Unit: wt%

TABLE 10 modified Sulfur concrete with slag in the amount of each component (corresponding to the ratio in TABLE 9)

Unit: kg/m³

TABLE 11 compressive Strength of modified Sulfur concrete doped with different fillers

Unit: MPa of

3. Influence of aggregate mixing amount on mechanical property of modified sulfur concrete

According to the component proportion and the amount (the mass percentage of each component and the corresponding amount) shown in tables 12-15, three blocks of 70.7mm multiplied by 70.7mm are prepared according to the cold water bath vibration forming process (the method in the establishment of the modified sulfur concrete cold water bath vibration forming process), and then the mechanical property is tested through a microcomputer hydraulic test, and the average value is calculated. The selected filler is cement (P.O.42.5 cement), the ratio of each group of modified sulfur to the cement is unchanged, and the crushed stones comprise granite crushed stones with the particle size of 5-9mm and granite crushed stones with the particle size of 10-15mm (the mass ratio is 3: 1). Group A changes the aggregate total content to keep the same sand rate, group B changes the sand rate to keep the same aggregate total content (aggregate total is river sand mass + crushed stone mass, sand rate is the ratio of river sand mass to aggregate total mass).

As shown in the results of the compressive strength tests in Table 16, in the case of the total amount of the aggregate, the compressive strength of the modified sulfur concrete increased first and then decreased as the total amount of the aggregate increased, and the peak value was A2, the total amount of the aggregate was 73.4%, and the compressive strength was 85.6 MPa. In the aspect of sand rate, along with the increase of the sand rate, the compressive strength of the modified sulfur concrete is increased and then decreased, the peak value is B2, the sand rate is 0.34, and the compressive strength is 84.6 MPa. This gave the highest compressive strength at a total aggregate content of 73.4% and a sand fraction of 0.34.

TABLE 12 modified sulphur concrete mix ratios with different aggregate contents

Unit: wt%

Numbering	Modified sulfur	Cement	River sand	Crushing stone	Aggregate amount
						A1	14.1	14.1	25.3	46.5	71.8
A2	13.3	13.3	25.8	47.6	73.4
						A3	12.5	12.5	26.3	48.7	75.0
A4	11.7	11.7	26.8	49.8	76.6

TABLE 13 amount of each component of modified sulfur concrete with different aggregate contents (corresponding to the ratio in TABLE 12)

Unit: kg/m³

TABLE 14 formulation of modified sulphur concrete with different sand ratios

Unit: wt%

Numbering	Modified sulfur	Cement	Sand	Crushing stone	Sand rate
						B1	13.3	13.3	22.0	51.4	0.30
B2	13.3	13.3	24.9	48.5	0.34
						B3	13.3	13.3	27.8	45.6	0.38
B4	13.3	13.3	30.7	42.7	0.42

TABLE 15 modified Sulfur concrete of different Sand Rate use amounts of ingredients (corresponding to the ratio in TABLE 14)

Unit: kg/m³

Numbering	Modified sulfur	Cement	Sand	Crushing stone	Sand rate
						B1	410.3	410.3	678.7	1585.7	0.30
B2	410.3	410.3	768.2	1496.2	0.34
						B3	410.3	410.3	857.6	1406.7	0.38
B4	410.3	410.3	947.1	1317.3	0.42

TABLE 16 compressive strengths of modified sulphur concretes of different aggregate contents and sand ratios

Unit: MPa of

	Compressive strength		Compressive strength
				A1	78.2	B1	80.5
A2	85.6	B2	87.2
				A3	81.2	B3	85.1
A4	64.8	B4	84.3

In summary, when the modified sulfur concrete is prepared by adopting the cold water bath vibration forming process, the optimal components and the proportion relation are as follows: 13.3 percent of modified sulfur, 13.3 percent of P.O.42.5 cement, 24.9 percent of common river sand and 73.4 percent of gravel (36.4 percent of granite gravel with the grain diameter of 5mm-9mm and 12.1 percent of granite gravel with the grain diameter of 10mm-15 mm); the modified sulfur comprises 97% of sulfur and 3% of modifier dicyclopentadiene.

The modified sulfur concrete test block prepared by adopting the optimal components and the proportion according to the cold water bath vibration forming process (the method in the establishment of the modified sulfur concrete cold water bath vibration forming process) has the advantages of compressive strength of 87.2MPa, excellent compressive strength, few internal holes, high substrate compaction degree and good sustainable utilization rate, and is measured by a microcomputer hydraulic testing machine.

The embodiments of the present invention have been described in detail, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.

Claims

1. The process for preparing the high-strength modified sulfur concrete by the cold water bath vibration forming method is characterized by comprising the following components in percentage by mass:

s1, pretreatment of the materials:

2. The process for preparing high-strength modified sulfur concrete by the cold water bath vibration forming method according to claim 1, wherein the modified sulfur concrete comprises the following components in percentage by mass:

3. The process for preparing high-strength modified sulfur concrete according to claim 1, wherein the preheating temperature in step S12 is 140 ℃ for 1 hour.

4. The process for preparing high-strength modified sulfur concrete by the cold water bath vibration molding method as claimed in claim 1, wherein the reaction temperature in step S13 is 135-145 ℃ for 2-3 hours.

5. The process for preparing high-strength modified sulfur concrete according to claim 1, wherein the water tank and the mold are subjected to the preheating treatment in step S12 together with sulfur, river sand-filler mixture and aggregate mixture before use.

6. The process of claim 1, wherein in step S14, the river sand-filler mixture is added to the modified sulfur twice, each time stirring for 30 seconds, and then the aggregate mixture is added in the same manner 2 times, each time stirring for 30 seconds, to obtain the sulfur concrete premix.

7. The process for preparing high strength modified sulfur concrete according to claim 1, wherein the vibration device includes but is not limited to a vibration table and a vibration rod.