CN108911603B - Large-volume concrete and preparation and construction process thereof - Google Patents
Large-volume concrete and preparation and construction process thereof Download PDFInfo
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- CN108911603B CN108911603B CN201810841267.1A CN201810841267A CN108911603B CN 108911603 B CN108911603 B CN 108911603B CN 201810841267 A CN201810841267 A CN 201810841267A CN 108911603 B CN108911603 B CN 108911603B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/16—Structures made from masses, e.g. of concrete, cast or similarly formed in situ with or without making use of additional elements, such as permanent forms, substructures to be coated with load-bearing material
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention discloses mass concrete and a preparation and construction process thereof, and relates to the field of concrete. Aims to improve the cracking problem of concrete by improving the concrete formula and the concrete construction process. The concrete comprises the following components, by weight, 170 parts of water, 185 parts of cement, 635 parts of medium sand, 1100 parts of crushed stone with the particle size of 5-25mm, 94-100 parts of external admixture, 175 parts of mineral powder and 160 parts of additive, and 5.11-5.12 parts of admixture; the additive comprises a water reducing agent and a retarder. In the construction, through layering and partition construction, a plurality of stainless steel punching net pipes are inserted into concrete after the concrete construction of each layer is completed. The concrete is improved from the formula to the construction, wherein the hydration peak period of the concrete can be effectively improved by adding the retarder into the formula of the concrete, and the cracking phenomenon of the solidified concrete is reduced; the use of the stainless steel punching mesh pipe in the concrete construction process increases the effect of the heat dissipation of the concrete and further reduces the cracks of the concrete caused by the generation of hydration heat.
Description
Technical Field
The invention relates to the field of concrete, in particular to mass concrete and a preparation and construction process thereof.
Background
The definition given to mass concrete in the "mass concrete construction code" includes two dimensions of property and volume. Voluminous concrete means concrete with the smallest geometrical dimension of a structure entity not less than 1m in terms of volume; qualitatively, it refers to cracked concrete caused by shrinkage and temperature change due to hydration of the cementitious material.
With the rapid development of social economy, the probability of construction by using mass concrete in various modern building projects such as high-rise buildings, hydraulic engineering, large-scale equipment and the like is higher and higher. The large-volume concrete is mainly characterized by large volume, rapid temperature rise inside and concentrated cement hydration heat release, and when the temperature difference between the inside and the outside is large, temperature cracks are easily caused, the cracks affect the appearance of a building project slightly, and the impermeability and the overall safety are affected seriously, so that a plurality of hidden troubles are buried.
Chinese patent with an authorization publication number of CN101486548B discloses C50 mass concrete, which comprises the following specific raw materials in parts by weight: 300 parts of cement, 1100 parts of crushed stone, 620 parts of sand, 180 parts of water, 200 parts of ground slag and 7 parts of admixture SPA.
The granted patent document indicates that the mass concrete anti-cracking effect can be better by utilizing the mixing proportion of the concrete and matching with other measures to carry out mass concrete construction.
Although the admixture SPA added in the formula can further reduce the cracks of concrete by reducing the using amount of cement so as to reduce the hydration heat, the cracks still occur in the actual construction process. This patent document does not disclose a specific method of how to prepare a large volume of concrete. Therefore, it is still necessary to develop a mass concrete in combination with a corresponding construction process to reduce cracking of the concrete.
Disclosure of Invention
The invention aims to provide mass concrete which has the advantage of less cracking in the construction process.
The above object of the present invention is achieved by the following technical solutions:
the mass concrete comprises the following components, by weight, 170-180 parts of water, 180-185 parts of cement, 635-730 parts of medium sand, 1000-1100 parts of crushed stone with the particle size of 5-25mm, 94-100 parts of external admixture, 175 parts of mineral powder 160-175 and 5.11-5.12 parts of admixture; the additive comprises a water reducing agent and a retarder; the weight portion ratio of the water reducing agent to the retarder is 5.1 to (0.11-0.12).
By implementing the technical scheme, the cement is used as a cementing material, and the medium sand and the broken stone are used as aggregates, so that the compressive strength of the concrete is enhanced.
The mechanical property of the concrete can be improved by adding the admixture.
The powdered ore is a general term for stone powder and its substitute meeting the engineering requirements, and is a product obtained by crushing and processing the ore, and the addition of the powdered ore into the concrete can reduce the consumption of cement, improve the workability of the concrete, reduce the hydration heat, enhance the later strength, improve the internal structure of the concrete, and improve the impermeability and corrosion resistance. After the ground ore powder is mixed into the concrete, the hydration speed of the cementing material can be delayed, the setting time of the concrete is prolonged, and the construction and the transportation of the concrete in high-temperature seasons are facilitated.
The addition of the retarder can prolong the setting time of concrete, delay the hydration peak period and further reduce the influence of cracks caused by hydration heat.
The water reducing agent can reduce the hydration heat in the concrete solidification process, and the generation of the hydration heat is further reduced.
In the whole components, the components are matched with each other and used cooperatively, so that the peak time of cement hydration is reduced, cracking is reduced, and the performance of concrete is excellent.
Further, the retarder comprises the following components in percentage by weight: 20-40% of modified pulp black liquor, 30-40% of maltose, 10-20% of chitosan, 3-18% of lime milk, 10-18% of calcium lignosulphonate and 1-5% of aluminum sulfate.
By implementing the technical scheme, the utilization rate of the waste paper pulp black liquor is increased by using the paper pulp black liquor in the retarder, and the retarder is more environment-friendly.
Maltose and chitosan have strong solid-liquid surface activity, can be adsorbed on the surface of cement mineral particles to form a solvation adsorption layer, prevent the particles from contacting and coagulating, destroy the flocculation structure of cement, enable the initial hydration calcium of cement to contain a plurality of hydroxyl groups, have strong inhibiting effect on the initial hydration of cement, increase the free water, improve the fluidity of cement paste and slow down the solidification speed of cement.
Maltose and chitosan can also react with lime milk and calcium lignosulfonate to generate a saccharified calcium complex, so that the setting speed of the cement is further slowed down.
The chitosan has antibacterial property, and can improve the mildew phenomenon of concrete when added into the concrete.
The added aluminum sulfate can be matched with starch and cane sugar for use, and concrete cracks are reduced.
The retarder components are mutually matched, so that the slump retaining performance of concrete is improved, and the problem of long formwork removal time of concrete construction caused by the retarder retarding effect can be reduced.
Further, the modified pulp black liquor comprises the following treatment processes: regulating pH to 10-11 with sulfuric acid, adding ferric trichloride 1-2 ‰ of the mass of the pulp black liquor and 20-30% of sodium sulfite, maintaining the temperature at 80-85 deg.C for 2-4 hr, and neutralizing with sulfuric acid to pH 7-9.
By implementing the technical scheme, lignin in the pulp black liquor can be extracted as much as possible in the process, lignosulfonate is formed by reaction, the reaction process is simple, and the delayed coagulation effect is more obvious when the lignosulfonate is matched with cane sugar and starch for use.
Further, the retarder comprises the following preparation processes: adding maltose and chitosan into a stirrer, and uniformly mixing to obtain a first mixture; and continuously adding lime milk, calcium lignosulfonate and aluminum sulfate into the first mixture, continuously stirring uniformly to obtain a second mixture, adding the paper pulp black liquor into the second mixture, and stirring and mixing uniformly to obtain the retarder.
By implementing the technical scheme, the retarder is prepared through the operation process, and the operation process is simple.
Further, sodium lignosulfonate is selected as the water reducing agent.
By implementing the technical scheme, the sodium lignosulfonate can be matched with the retarder, so that the cement dosage is reduced, and the slump retaining performance of concrete can be improved.
Further, the admixture comprises fly ash, bentonite and bamboo fiber.
Further, the weight part ratio of the fly ash to the bentonite to the bamboo fiber is 73 to (20-25) to (1-2).
By implementing the technical scheme, the fly ash is added into the concrete to fill the gaps of the aggregate particles and wrap the aggregate particles to form a lubricating layer, and the fly ash has the capacity of only about 2/3 of cement and good particle shape, so that the fly ash can be filled more densely; the cement particles are physically dispersed, so that the cement particles are dispersed more uniformly; the fly ash and calcium hydroxide crystals enriched around the aggregate particles are subjected to a pozzolanic reaction, so that a product with a gelling property is generated, a weak transition region is reinforced, and the concrete has a remarkable effect of improving various performances of the concrete; the fly ash delays the hydration speed, reduces the temperature rise of the concrete caused by hydration heat, and is very favorable for preventing the concrete from generating temperature cracks.
The bentonite is water-containing clay mineral mainly containing montmorillonite, has swelling property, cohesiveness, adsorptivity, catalysis property, thixotropy, suspension property, cation exchange property and the like, and can be used together with the fly ash to enhance the flexural strength and compressive strength of concrete.
The bamboo fiber is used as a green ecological fiber, can limit the appearance and the development of micro cracks in a cement matrix, and can bear the tensile stress of contraction and air entraining in concrete in each stage of concrete forming so as to reduce or even prevent the generation of cracks.
The invention also aims to provide a preparation method of the mass concrete, which has the advantage of simple operation.
A preparation method of mass concrete comprises the following preparation steps,
step 1: weighing the components of the mass concrete according to the parts by weight for later use;
step 2: sequentially adding cement, medium sand, broken stone, admixture, mineral powder and water into a stirrer, stirring for 1-3min, and uniformly mixing;
and step 3: and continuously adding the additive into the stirrer, mixing for 2-4min, uniformly stirring, and discharging.
By implementing the technical scheme, the concrete is prepared, and the operation is simple.
The invention also aims to provide a construction process of mass concrete, which has the advantage of reducing concrete cracking after construction.
A construction process of mass concrete comprises the following construction steps:
s1: preparing and checking a machine;
s2: before pouring, carrying out comprehensive and detailed inspection on a template, a reinforcing steel bar, an embedded part and a reserved hole at a pouring part, and recording;
s3: pouring: the method comprises the following steps of sequentially dividing the casting area into four casting areas at equal intervals from left to right, reserving a slow casting area in each casting area, and reserving the slow casting area on the right side of the casting area; during pouring, the four pouring areas are poured by themselves, each slow pouring area is poured in a layered mode, and the next layer of pouring is carried out after each layer of concrete is poured for 13-15 hours;
s4: after the pouring is finished, wood is used for plastering, pressing and final setting, a plastic film and a straw mat are used for covering, and then the watering maintenance is carried out for 7-10 days.
By implementing the technical scheme, the hydration heat of the concrete can be dissipated as much as possible by layered pouring, the dissipation of the hydration heat is accelerated, and the problem that the heat in the middle of the cement cannot be dissipated in one-time pouring is solved. Therefore, the concrete is poured by the method, and cracking of the concrete is reduced.
Furthermore, after each layer of concrete is poured, a plurality of stainless steel punching net pipes distributed at intervals are inserted into the concrete.
By implementing the technical scheme, the stainless steel punching mesh pipe can play a role in increasing the heat dissipation of the concrete, and further reduces the cracks of the concrete caused by the generation of hydration heat.
In conclusion, the invention has the following beneficial effects:
the retarder is added into the concrete formula, so that the hydration peak period of the concrete can be effectively improved, and the cracking phenomenon of the solidified concrete is reduced;
secondly, the use of chitosan in the retarder not only can play a role of retarding, but also can play an antibacterial effect, so that the mildew of concrete is reduced;
thirdly, the admixture is selected from fly ash, bentonite and bamboo fiber, and the three are added in a matching way, so that the mechanical property of the concrete is effectively improved;
and fourthly, due to the use of the stainless steel punching mesh pipe in the concrete construction process, the heat dissipation effect of the concrete is improved, and cracks of the concrete caused by the generation of hydration heat are further reduced.
Detailed Description
The following describes a technical solution of an embodiment of the present invention.
Example one
The mass concrete comprises the following components in parts by weight: 170kg of water, 180kg of cement, 730kg of medium sand, 1000kg of crushed stone with the particle size of 5-25mm, 100kg of external admixture, 175kg of mineral powder and 5.11kg of additive; the additive comprises a water reducing agent and a retarder; the water reducing agent was 5.1kg of sodium lignosulfonate.
The admixture specifically comprises fly ash, bentonite and bamboo fiber. The concrete weight of the fly ash is 73kg, the weight of the bentonite is 25kg, and the weight of the bamboo fiber is 2 kg.
The retarder comprises 0.002kg of modified pulp black liquor, 0.004kg of maltose, 0.0011kg of chitosan, 0.0018kg of lime milk, 0.001kg of calcium lignosulphonate and 0.0001kg of aluminum sulfate.
The modified paper pulp black liquor comprises the following treatment processes: the pH value is adjusted to 10 by using sulfuric acid, ferric trichloride with the mass of 0.002g of the pulp black liquor and sodium sulfite with the mass of 0.4g are added, the temperature is kept constant at 80 ℃ for 2 hours, and then the pH value is neutralized by using sulfuric acid to be 7.
The retarder comprises the following preparation processes: adding maltose and chitosan into a stirrer, and uniformly mixing to obtain a first mixture; and continuously adding lime milk, calcium lignosulfonate and aluminum sulfate into the first mixture, continuously stirring uniformly to obtain a second mixture, adding the paper pulp black liquor into the second mixture, and stirring and mixing uniformly to obtain the retarder.
The preparation method of the mass concrete comprises the following preparation steps,
step 1: weighing the components of the mass concrete according to the parts by weight for later use;
step 2: adding cement, medium sand, broken stone, admixture, mineral powder and water into a stirrer according to the dilution, stirring for 1min, and uniformly mixing;
and step 3: and continuously adding the admixture into the stirrer, mixing for 2min, uniformly stirring, and discharging.
The construction process of the mass concrete comprises the following construction steps:
s1: preparing and checking machines, and fully preparing a concrete delivery pump, a pump pipe, a clamp, a string barrel, a hopper, a vibrator and a scraping rule according to the requirements;
s2: before pouring, carrying out comprehensive and detailed inspection on a template, a reinforcing steel bar, an embedded part and a reserved hole at a pouring part, and recording;
s3: pouring: the method comprises the following steps of sequentially dividing the casting area into four casting areas at equal intervals from left to right, reserving a slow casting area in each casting area, and reserving the slow casting area on the right side of the casting area; during pouring, the four pouring areas are poured by themselves, each slow pouring area is poured in a layered mode, and pouring is carried out after each layer of concrete is poured for 13 hours; after each layer of concrete is poured, a plurality of stainless steel punching mesh pipes are inserted into the concrete. The distance between each stainless steel punching mesh pipe is 1 m.
S4: after the pouring is finished, wood is used for plastering, pressing and final setting, a plastic film and a straw mat are used for covering, and then the watering and curing are carried out for 7 days.
Example two
The difference between the second embodiment and the first embodiment is the content of concrete components and the parameters in the modified pulp black liquor, concrete processing and construction process.
See table 1 and table 2 for components.
The modified paper pulp black liquor comprises the following treatment processes: adjusting pH to 10 with sulfuric acid, adding ferric trichloride of 0.0025g and sodium sulfite of 0.5g into the pulp black liquor, keeping the temperature at 80 deg.C for 3 hr, and neutralizing with sulfuric acid to pH 8.
The preparation method of the mass concrete comprises the following preparation steps,
step 1: weighing the components of the mass concrete according to the parts by weight for later use;
step 2: adding cement, medium sand, crushed stone, admixture, mineral powder and water into a stirrer according to the dilution, stirring for 2min, and uniformly mixing;
and step 3: and continuously adding the admixture into the stirrer, mixing for 3min, uniformly stirring, and discharging.
The construction process of the mass concrete comprises the following construction steps:
s1: preparing and checking machines, and fully preparing a concrete delivery pump, a pump pipe, a clamp, a string barrel, a hopper, a vibrator and a scraping rule according to the requirements;
s2: before pouring, carrying out comprehensive and detailed inspection on a template, a reinforcing steel bar, an embedded part and a reserved hole at a pouring part, and recording;
s3: pouring: the method comprises the following steps of sequentially dividing the casting area into four casting areas at equal intervals from left to right, reserving a slow casting area in each casting area, and reserving the slow casting area on the right side of the casting area; during pouring, the four pouring areas are poured by themselves, each slow pouring area is poured in a layered mode, and pouring is carried out after each layer of concrete is poured for 14 hours; after each layer of concrete is poured, a plurality of stainless steel punching mesh pipes are inserted into the concrete. The distance between each stainless steel punching mesh pipe is 1 m.
S4: after the pouring is finished, wood is smeared, compressed and finally set, a plastic film and a straw mat are adopted for covering, and then the watering and the curing are carried out for 8 days.
EXAMPLE III
The difference between the third embodiment and the first embodiment is that the content of concrete components is different, and the parameters in the modified pulp black liquor, the concrete processing and construction process are different.
See table 1 and table 2 for components.
The modified paper pulp black liquor comprises the following treatment processes: the pH value is adjusted to 11 by using sulfuric acid, ferric trichloride with the mass of 0.006g of the pulp black liquor and sodium sulfite with the mass of 0.12g are added, the temperature is kept constant for 4 hours at the temperature of 85 ℃, and then sulfuric acid is used for neutralizing until the pH value is 9.
The preparation method of the mass concrete comprises the following preparation steps,
step 1: weighing the components of the mass concrete according to the parts by weight for later use;
step 2: adding cement, medium sand, crushed stone, admixture, mineral powder and water into a stirrer according to the dilution, stirring for 3min, and uniformly mixing;
and step 3: and continuously adding the admixture into the stirrer, mixing for 4min, uniformly stirring, and discharging.
The construction process of the mass concrete comprises the following construction steps:
s1: preparing and checking machines, and fully preparing a concrete delivery pump, a pump pipe, a clamp, a string barrel, a hopper, a vibrator and a scraping rule according to the requirements;
s2: before pouring, carrying out comprehensive and detailed inspection on a template, a reinforcing steel bar, an embedded part and a reserved hole at a pouring part, and recording;
s3: pouring: the method comprises the following steps of sequentially dividing the casting area into four casting areas at equal intervals from left to right, reserving a slow casting area in each casting area, and reserving the slow casting area on the right side of the casting area; during pouring, the four pouring areas are poured by themselves, each slow pouring area is poured in a layered mode, and pouring is carried out after each layer of concrete is poured for 15 hours; after each layer of concrete is poured, a plurality of stainless steel punching mesh pipes are inserted into the concrete. The distance between each stainless steel punching mesh pipe is 1 m.
S4: after the pouring is finished, wood is smeared, compressed and finally set, a plastic film and a straw mat are adopted for covering, and then the watering and the curing are carried out for 10 days.
Example four
The difference between example four and example one is the content of concrete components. See table 1 and table 2 for components.
EXAMPLE five
The difference between the fifth embodiment and the first embodiment is the content of concrete components. See table 1 and table 2 for components.
Table 1 shows the contents of the respective components of the concrete of examples 1 to 5.
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | |
| Water/kg | 170 | 173 | 175 | 177 | 180 |
| Cement/kg | 180 | 181 | 182 | 183 | 185 |
| Medium sand/kg | 730 | 711 | 688 | 671 | 636 |
| Crushed stone/kg | 1000 | 1020 | 1050 | 1070 | 1100 |
| Admixture/kg | 100 | 100 | 95 | 94 | 94 |
| Mineral powder/kg | 175 | 170 | 165 | 160 | 160 |
| Additive/kg | 5.11 | 5.11 | 5.12 | 5.12 | 5.12 |
Table 2 shows the contents of admixture and admixture for examples 1 to 5.
Comparative example 1
The difference between the comparative example 1 and the example 1 is that the retarder in the comparative example 1 is selected from super retarder manufactured by Beijing Kai Jianchang engineering technology Limited, and the rest is consistent with the example 1.
Comparative example 2
Comparative example 2 differs from example 2 in that the retarder in comparative example 2 does not contain aluminum sulfate, and the rest is identical to example 1.
Comparative example 3
Comparative example 3 differs from example 3 in that the admixture of comparative example 3 includes only fly ash, all other things remaining the same as in example 1.
Comparative example 4
Comparative example 4 differs from example 4 in that the admixture in comparative example 4 does not include bamboo fiber, and the others are in agreement with example 1.
Experimental detection
1. Testing the mechanical property of the concrete according to GB/T50081-2002 Standard of Experimental methods for mechanical properties of ordinary concrete;
2. detecting the crack resistance of the concrete by using an annular constraint test: the cracking time is less than 1h, the cement is poor, and the cracking time is more than 15h, which is excellent;
3. the slow setting time is as follows: the determination is carried out according to GB/T1346-89 Experimental method for water consumption, setting time and stability of standard consistency of cement.
Table 3 experimental results of testing the mechanical properties of the concrete of examples 1 to 5 and comparative examples 1 to 4.
As can be seen from the experimental results of examples 1 to 5 in Table 3, the mechanical properties of the concrete of examples 1 to 5 were satisfactory for practical use.
Comparing the experimental results of the example 1 and the comparative example 1, when the retarder is different, the mechanical property of the concrete is changed, and the applicant can reasonably deduce that the retarder in the components further influences the mechanical property of the concrete by influencing the setting time of the concrete.
Comparing the experimental results of example 1 and comparative example 2, it can be shown that the mechanical properties of the concrete can be increased by adding aluminum sulfate in the retarder.
Comparing the experimental results of example 1 with comparative examples 3 and 4, the addition of both bamboo fiber and bentonite in the admixture can increase the mechanical properties of concrete.
Table 4 experimental test results of crack resistance properties of examples 1 to 5 and comparative examples 1 to 4.
The experimental data in table 4 show that the concrete prepared according to the component content in the present application has relatively good crack resistance, and further, the concrete prepared according to comparative example 1 can also have an influence on the cracking performance of the concrete due to the selection of the coagulant.
Table 5 experimental results of the retardation time of examples 1 to 5 and comparative examples 1 to 4.
The experimental data in table 5 can show that the difference between the initial setting time and the final setting time of the concrete in the present application document is large, so that the concrete can have enough time to dissipate hydration heat when being solidified, the concrete is not easy to crack after being solidified, and further, the selection of the retarder can also have a large influence on the improvement of the retardation time of the concrete.
The experimental data in tables 3-5 are combined to obtain that the proper coagulant is selected, so that the mechanical property and the cracking property of the concrete can be influenced while the retarding time is improved.
Claims (7)
1. The mass concrete is characterized by comprising the following components, by weight, 170-180 parts of water, 180-185 parts of cement, 635-730 parts of medium sand, 1000-100 parts of crushed stone with the particle size of 5-25mm, 94-100 parts of external admixture, 160-175 parts of mineral powder and 5.11-5.12 parts of admixture; the additive comprises a water reducing agent and a retarder; the weight part ratio of the water reducing agent to the retarder is 5.1: (0.11-0.12); the retarder comprises the following components in percentage by weight: 20-40% of modified pulp black liquor, 20-40% of maltose, 10-20% of chitosan, 3-18% of lime milk, 10-18% of calcium lignosulfonate and 1-5% of aluminum sulfate; the modified pulp black liquor comprises the following treatment processes: adjusting pH to 10-11 with sulfuric acid, adding ferric trichloride 1-2 ‰ of the mass of the pulp black liquor and 20-30% of sodium sulfite, keeping the temperature at 80-85 deg.C for 2-4 hr, and neutralizing with sulfuric acid to pH 7-9; the retarder comprises the following preparation processes: adding maltose and chitosan into a stirrer, and uniformly mixing to obtain a first mixture; and continuously adding lime milk, calcium lignosulfonate and aluminum sulfate into the first mixture, continuously stirring uniformly to obtain a second mixture, adding the paper pulp black liquor into the second mixture, and stirring and mixing uniformly to obtain the retarder.
2. A mass concrete according to claim 1, wherein said water reducing agent is selected from sodium lignosulphonates.
3. The mass concrete of claim 1, wherein the admixture comprises fly ash, bentonite, and bamboo fiber.
4. The mass concrete as claimed in claim 3, wherein the weight ratio of the fly ash to the bentonite to the bamboo fiber is 73: (20-25): (1-2).
5. The method for producing a mass concrete according to any one of claims 1 to 4, comprising the production steps of,
step 1: weighing the components of the mass concrete according to the parts by weight for later use;
step 2: sequentially adding cement, medium sand, broken stone, admixture, mineral powder and water into a stirrer, stirring for 1-3min, and uniformly mixing;
and step 3: and continuously adding the additive into the stirrer, mixing for 2-4min, uniformly stirring, and discharging.
6. The construction process of mass concrete according to claim 5, comprising the following construction steps:
s1: preparing and checking a machine;
s2: before pouring, carrying out comprehensive and detailed inspection on a template, a reinforcing steel bar, an embedded part and a reserved hole at a pouring part, and recording;
s3: pouring: the method comprises the following steps of sequentially dividing the casting area into four casting areas at equal intervals from left to right, reserving a slow casting area in each casting area, and reserving the slow casting area on the right side of the casting area; during pouring, the four pouring areas are poured by themselves, each slow pouring area is poured in a layered mode, and the next layer of pouring is carried out after each layer of concrete is poured for 13-15 hours;
s4: after the pouring is finished, wood is used for plastering, pressing and final setting, a plastic film and a straw mat are used for covering, and then the watering maintenance is carried out for 7-10 days.
7. The construction process of mass concrete according to claim 6, wherein after each layer of concrete is poured, a plurality of stainless steel perforated mesh pipes are inserted into the concrete at intervals.
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| CN110041025A (en) * | 2019-04-04 | 2019-07-23 | 广西建工集团冶金建设有限公司 | A kind of ameliorative mass concrete and preparation method thereof |
| CN110482946A (en) * | 2019-08-10 | 2019-11-22 | 江苏宇辉住宅工业有限公司 | A kind of ultra-large volume high intensity low hydration heat concrete |
| CN112551935A (en) * | 2019-09-25 | 2021-03-26 | 中路高科交通检测检验认证有限公司 | Concrete hydration heat inhibiting material and preparation method thereof |
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| CN112609819A (en) * | 2020-11-11 | 2021-04-06 | 河海大学 | Concrete member and temperature control method thereof |
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