CN110981309A - Concrete for slip form casting and preparation method thereof - Google Patents

Concrete for slip form casting and preparation method thereof Download PDF

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Publication number
CN110981309A
CN110981309A CN201911330408.4A CN201911330408A CN110981309A CN 110981309 A CN110981309 A CN 110981309A CN 201911330408 A CN201911330408 A CN 201911330408A CN 110981309 A CN110981309 A CN 110981309A
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China
Prior art keywords
concrete
polycarboxylic acid
acid water
casting
aggregate
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CN201911330408.4A
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Chinese (zh)
Inventor
南春明
李红伟
乔金宁
侯军岐
李庆宏
杨保旺
蔡艳辉
周扬
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Xingtai Jiangong Commercial Concrete Co ltd
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Xingtai Jiangong Commercial Concrete Co ltd
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Publication of CN110981309A publication Critical patent/CN110981309A/en
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/04Portland cements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength

Abstract

The invention discloses concrete for slip-form casting and a preparation method thereof. According to the invention, by proper raw material proportion, the types and the use amounts of an adhesive and an additive (water reducing agent) suitable for slip-form casting concrete are preferably selected, the fresh concrete has excellent working performance, the slump loss is obviously reduced, the slump is controlled within 180-230 mm, and meanwhile, the fresh concrete has higher strength; the pumpability of the concrete is good, and the construction is facilitated; the invention has simple manufacturing process and wide material source, is suitable for large-scale production, can be cast in situ and prefabricated in factories, and has great market application and popularization values.

Description

Concrete for slip form casting and preparation method thereof
Technical Field
The invention belongs to the technical field of concrete, and particularly relates to concrete for slip form casting and a preparation method thereof.
Background
Slip-form casting is one of the templates used in cement concrete casting, can gradually slide along the horizontal direction, the slope direction or the vertical direction to cast and smash the concrete and demold the concrete, is an economical advanced method called slip-form construction, uses concrete which is hard and thick, otherwise, after the template slides, the edge of the concrete is easy to collapse and damage, the plasticity and the tightness of the newly-mixed concrete are good, but the stability is poor, the edge collapse and the flow angle are easy to occur, and the plastic shrinkage is large, so the concrete suitable for slip-form casting is prepared.
The existing concrete suitable for slip form casting has the defects that the slump loss and the expansion loss of the concrete are too high due to various reasons, the on-site fluidity and the construction performance cannot meet the construction requirements, and great difficulty is caused in the construction process. In such a situation, the construction site and the concrete mixing plant generally control the loss of fluidity of the concrete by adjusting the mix proportion of the concrete, increasing the admixture dosage or increasing the amount of retarder in the admixture, and these measures cause new quality problems, such as segregation and bleeding of the concrete caused by overdoping of the admixture, too long setting time caused by overdoping of the retarder, and even more serious quality accidents.
Disclosure of Invention
In view of the above, the technical problem to be solved by the present invention is to overcome the defects of the prior art, and provide a concrete for slip casting and a preparation method thereof.
In order to achieve the above purpose, the invention provides the following technical scheme:
the concrete for slip form casting is prepared by uniformly stirring the raw materials according to the following weight ratio by a concrete stirrer, wherein the volume weight of the stirred mixture reaches 2250-2350 kg/m3(ii) a Wherein the aggregate comprises 1000-1100 kg/m of aggregate3350-400 kg/m cement3700-750 kg/m of sand38 to 10kg/m of a microcapsule type polycarboxylic acid water reducing agent340-60 kg/m of nano calcium carbonate30.5 to 1.0kg/m of basalt fiber3140 to 160kg/m of water3
By adopting the technical scheme, the invention has the following beneficial effects:
the concrete for slip-form casting provided by the invention selects and selects the type and the amount of the adhesive and the additive (water reducing agent) suitable for slip-form casting of the concrete through reasonable proportion, and the newly-mixed concrete has excellent working performance, obviously reduced slump loss and good pumpability and is beneficial to construction.
Preferably, the preparation process of the microcapsule type polycarboxylic acid water reducing agent comprises the following steps: and stirring and dispersing the carrier with pores in the polycarboxylic acid water reducing agent solution, fully soaking for 20-22 h, filtering, and spray drying to obtain the microcapsule type polycarboxylic acid water reducing agent.
The slow-release microcapsule type polycarboxylate water reducing agent is prepared from the polycarboxylate water reducing agent and the carrier, so that the early strength of concrete can be improved, the fluidity and slump of concrete mixtures can be maintained, the slow-release microcapsule type polycarboxylate water reducing agent becomes an early-strength slump-retaining high-performance water reducing agent, and the early cracking performance of concrete can be effectively reduced.
Preferably, the porous support is porous silica, porous quartz sand or porous fine sand.
In the present invention, the amount of the carrier is not limited strictly, and those skilled in the art can add a proper amount of the carrier according to specific situations and needs.
Preferably, the solid content of the polycarboxylic acid water reducing agent solution is 15-20%, and the water reducing rate of the polycarboxylic acid water reducing agent is more than or equal to 8%.
In the invention, the solid content of the polycarboxylic acid water reducing agent solution is generally 15-20%, and the inventor of the application finds that the property of the prepared microcapsule type polycarboxylic acid water reducing agent is optimal when the solid content of the water reducing agent solution is 18% which is the most appropriate concentration through creative tests.
Preferably, the aggregate is crushed stone or pebble with the thickness of 5-10 mm, and the aggregate is doped with 14-16 kg/m3The recycled fine aggregate of (1).
In the invention, the crushing value of the aggregate is less than or equal to 15 percent, the needle sheet content is less than or equal to 15 percent, the mud content is less than or equal to 1 percent, and the apparent density is more than or equal to 2500kg/m3The bulk density is more than or equal to 1350kg/m3The porosity is less than or equal to 47 percent.
Preferably, the recycled fine aggregate is recycled fine aggregate particles with the particle size not more than 4.50mm, which are obtained by crushing and screening waste concrete.
Firstly, the waste concrete is developed and utilized as recycled aggregate, so that the problems that a large amount of waste concrete is difficult to treat and the ecological environment is gradually deteriorated due to the difficulty are solved; on the other hand, the consumption of natural aggregate in the construction industry can be reduced, so that the exploitation of fine aggregate stones is reduced, the problems that the natural aggregate is increasingly deficient and the ecological environment is damaged by the exploitation of a large amount of gravels are fundamentally solved, and the comprehensive benefit is remarkable.
In addition, the invention mixes and stirs the recycled fine aggregate particles and water to obtain the recycled mortar which is used as a special reinforcing agent (adhesive) for preparing the slip-form casting concrete, so that the cement, the aggregate and the sand are effectively and tightly bonded together to achieve the strength required by the concrete engineering.
Preferably, the cement is white portland cement or colored cement with the strength grade higher than 42.5.
The invention selects high-strength cement to improve the mechanical strength of the pervious concrete and increase the compressive strength so as to meet the engineering requirements of the concrete.
Another object of the present invention is to provide a method for preparing concrete for slip-casting.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the preparation method of the concrete for slip-form casting specifically comprises the following steps:
(1) preparing a microcapsule type polycarboxylic acid water reducing agent: stirring and dispersing the carrier with pores in a polycarboxylic acid water reducing agent solution, fully soaking for 20-22 h, filtering, and spray drying to obtain the carrier;
(2) respectively weighing the following raw materials in formula ratio: aggregate 1000-1100 kg/m3350-400 kg/m cement3700-750 kg/m of sand38 to 10kg/m of a microcapsule type polycarboxylic acid water reducing agent340-60 kg/m of nano calcium carbonate30.5 to 1.0kg/m of basalt fiber3140 to 160kg/m of water3
(3) Fully and uniformly mixing the microcapsule type polycarboxylic acid water reducer weighed in the step (2) with water to obtain a mixed solution;
it should be noted that, in order to ensure the strength, water cannot be added at one time, the water can be added for 2-3 times, and the stirring time is not too short or too long easily.
(4) And (3) uniformly mixing and stirring the regenerated fine aggregate weighed in the step (2) with water with the weight ratio of 1.5-2.0 to prepare regenerated mortar, putting the regenerated mortar and the aggregate into a stirrer to stir for 25-35 s, then adding the mixed liquid obtained in the step (2) to stir uniformly, finally adding the sand and the basalt fiber weighed in the step (1), and continuously stirring to obtain the sponge body pervious concrete.
By adopting the technical scheme, the invention has the following beneficial effects:
the invention has simple manufacturing process and wide material source, is suitable for large-scale production, and can be cast in situ and prefabricated in factories.
Preferably, the carrier having pores in step (1) is porous silica, porous quartz sand or porous fine sand.
Preferably, the solid content of the polycarboxylic acid water reducing agent solution is 15-20%, and the water reducing rate of the polycarboxylic acid water reducing agent is more than or equal to 8%.
Preferably, in the step (3), the stirring time of the second stirring and the third stirring is not less than 120 s.
Preferably, the second stirring time and the third stirring time are both 120s, and in order to ensure the strength of the pervious concrete, the stirring time is not easy to be too long or too short.
It is also an object of the present invention to provide a use of concrete for slip casting.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the application of the concrete for slip-form casting specifically comprises the following steps:
(1) transporting the prepared concrete mixture by a concrete transport vehicle, continuously stirring the transported concrete mixture in the transportation process, wherein the stirring speed is not lower than 2r/min, and stirring for 100-150 s at the rotating speed of not lower than 6r/min 4-7 min before unloading;
(2) in the slip form pouring process, the whole process time is not more than 120min from the time when cement meets water to the time when the pouring is finished, and no water is added midway.
Preferably, the concrete for slip-casting of the invention is optimally used at a temperature of 10-25 ℃.
According to the technical scheme, compared with the prior art, the concrete for slip-form casting and the preparation method thereof provided by the invention have the advantages that aggregate, cement, sand, the microcapsule type polycarboxylate-type water reducing agent, nano calcium carbonate and basalt fiber are used as main raw materials, wherein the slow-release microcapsule type polycarboxylate-type water reducing agent is prepared by using the polycarboxylate-type water reducing agent and a carrier, so that the early strength of the concrete can be improved, the fluidity and the slump of a concrete mixture can be kept, the concrete becomes an early-strength slump-retaining high-performance water reducing agent, and the early cracking performance of the concrete can be effectively reduced;
the nano calcium carbonate can be used as a filling agent to enhance compactness, improve the rheological property of slurry and increase the stability of concrete, so that the prepared product is more suitable for slip-form casting;
in addition, proper basalt fibers are mixed in the concrete, so that an even disorderly support system is formed in the concrete to support the aggregates, and the adhesion force is absorbed by an interface between a fiber material and cement paste, so that the stability of the concrete is improved, and the problem that the edge of the concrete is easy to collapse and damage after the template slides is solved;
in addition, the invention prepares the recycled mortar by mixing and stirring the recycled fine aggregate and the required saturated water, on one hand, the cement, the aggregate and the sand can be effectively and tightly bonded together to achieve the strength required by the concrete engineering; on the other hand, the problem of large concrete slump loss caused by the characteristics of high water absorption, low strength, irregular shape and the like of the recycled aggregate is solved, the loss is basically avoided within 2h, the applicability is wide, and the practical construction problems of poor working performance of fresh concrete and the like are solved.
According to the invention, through proper raw material proportion, the types and the use amounts of an adhesive and an additive (water reducing agent) suitable for slip-form casting concrete are preferably selected, the fresh concrete has excellent working performance, the slump loss is obviously reduced, the slump is controlled within 180-230 mm, and meanwhile, the fresh concrete has higher strength; the pumpability of the concrete is good, and the construction is facilitated;
the invention has simple manufacturing process and wide material source, is suitable for large-scale production, can be cast in situ and prefabricated in factories, and has great market application and popularization values.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention discloses concrete for slip form casting, which has good pumpability, is beneficial to construction and obviously reduces slump loss, and a preparation method thereof.
The present invention will be further specifically illustrated by the following examples for better understanding, but the present invention is not to be construed as being limited thereto, and certain insubstantial modifications and adaptations of the invention by those skilled in the art based on the foregoing disclosure are intended to be included within the scope of the invention.
The invention discloses a concrete for slip form casting, which is characterized in that the concrete is prepared by uniformly stirring the following raw materials in parts by weight by a concrete stirrer, and the volume weight of the stirred mixture reaches 2250-2350 kg/m3(ii) a Wherein the aggregate comprises 1000-1100 kg/m of aggregate3350-400 kg/m cement3700-750 kg/m of sand38 to 10kg/m of a microcapsule type polycarboxylic acid water reducing agent340-60 kg/m of nano calcium carbonate30.5 to 1.0kg/m of basalt fiber3140 to 160kg/m of water3
In order to further achieve the technical effects of the invention, the preparation process of the microcapsule type polycarboxylic acid water reducer comprises the following steps: and stirring and dispersing the carrier with pores in the polycarboxylic acid water reducing agent solution, fully soaking for 20-22 h, filtering, and spray drying to obtain the microcapsule type polycarboxylic acid water reducing agent.
In order to further achieve the technical effects of the present invention, the porous support is porous silica, porous quartz sand, or porous fine sand.
In order to further realize the technical effect of the invention, the solid content of the polycarboxylic acid water reducing agent solution is 15-20%, and the water reducing rate of the polycarboxylic acid water reducing agent is more than or equal to 8%.
In order to further realize the technical effect of the invention, the aggregate is crushed stone or pebble with the thickness of 5-10 mm, and the aggregate is doped with 14-16 kg/m3The recycled fine aggregate of (1).
In order to further realize the technical effect of the invention, the recycled fine aggregate is recycled fine aggregate particles with the particle size not more than 4.50mm, which are obtained by crushing and screening waste concrete.
The invention also discloses a preparation method of the concrete for slip-form casting, which comprises the following steps:
(1) preparing a microcapsule type polycarboxylic acid water reducing agent: stirring and dispersing the carrier with pores in a polycarboxylic acid water reducing agent solution, fully soaking for 20-22 h, filtering, and spray drying to obtain the carrier;
(2) respectively weighing the following raw materials in formula ratio: aggregate 1000-1100 kg/m3350-400 kg/m cement3700-750 kg/m of sand38 to 10kg/m of a microcapsule type polycarboxylic acid water reducing agent340-60 kg/m of nano calcium carbonate30.5 to 1.0kg/m of basalt fiber3140 to 160kg/m of water3
(3) Fully and uniformly mixing the microcapsule type polycarboxylic acid water reducer weighed in the step (2) with water to obtain a mixed solution;
(4) and (3) uniformly mixing and stirring the recycled fine aggregate weighed in the step (2) with water with the weight ratio of 1.5-2.0 to prepare recycled mortar, putting the recycled mortar and the aggregate into a stirrer to stir for 25-35 s, then adding the mixed liquid obtained in the step (2) to stir uniformly, finally adding the sand, the nano calcium carbonate and the basalt fiber weighed in the step (1), and continuously stirring to obtain the concrete for slip-form casting.
In order to further achieve the technical effect of the present invention, the carrier having pores in the step (1) is porous silica, porous quartz sand, or porous fine sand.
In order to further realize the technical effect of the invention, the solid content of the polycarboxylic acid water reducing agent solution is 15-20%, and the water reducing rate of the polycarboxylic acid water reducing agent is more than or equal to 8%.
In order to further achieve the technical effects of the present invention, in the step (3), the stirring time of the second stirring and the third stirring is not less than 120 s.
The technical solution of the present invention will be further described with reference to the following specific examples.
Example 1:
the preparation method of the concrete for slip-form casting specifically comprises the following steps:
(1): stirring and dispersing pore silicon dioxide in a polycarboxylic acid water reducer solution with the solid content of 15%, fully soaking for 22h, filtering, and spray drying to obtain a microcapsule type polycarboxylic acid water reducer;
(2) respectively weighing the following raw materials in formula ratio: 1085kg/m aggregate3Cement 360kg/m3710kg/m sand38.2kg/m of microcapsule type polycarboxylic acid water reducing agent345kg/m of nano calcium carbonate30.6kg/m basalt fiber3145kg/m of water3
(3) Fully and uniformly mixing the microcapsule type polycarboxylic acid water reducer weighed in the step (2) with water to obtain a mixed solution;
(4) and (3) uniformly mixing and stirring the recycled fine aggregate weighed in the step (2) with water with the weight ratio of 1.8 to prepare recycled mortar, putting the recycled mortar and the aggregate into a stirrer to stir for 30s, then adding the mixed liquid obtained in the step (2) to stir for 120s, finally adding the sand weighed in the step (1), nano calcium carbonate and basalt fiber, and continuously stirring for 120s to obtain the concrete for slip-form casting.
Example 2:
the preparation method of the concrete for slip-form casting specifically comprises the following steps:
(1): stirring and dispersing pore silicon dioxide in a polycarboxylic acid water reducer solution with the solid content of 15%, fully soaking for 22h, filtering, and spray drying to obtain a microcapsule type polycarboxylic acid water reducer;
(2) respectively weighing the following raw materials in formula ratio: aggregate 1065kg/m3370kg/m of cement3Sand 720kg/m38.5kg/m of microcapsule type polycarboxylic acid water reducing agent350kg/m of nano calcium carbonate30.7kg/m basalt fiber3150kg/m of water3
(3) Fully and uniformly mixing the microcapsule type polycarboxylic acid water reducer weighed in the step (2) with water to obtain a mixed solution;
(4) and (3) uniformly mixing and stirring the recycled fine aggregate weighed in the step (2) with water with the weight ratio of 1.8 to prepare recycled mortar, putting the recycled mortar and the aggregate into a stirrer to stir for 30s, then adding the mixed liquid obtained in the step (2) to stir for 120s, finally adding the sand weighed in the step (1), nano calcium carbonate and basalt fiber, and continuously stirring for 120s to obtain the concrete for slip-form casting.
Example 3:
the preparation method of the concrete for slip-form casting specifically comprises the following steps:
(1): stirring and dispersing pore silicon dioxide in a polycarboxylic acid water reducer solution with the solid content of 15%, fully soaking for 22h, filtering, and spray drying to obtain a microcapsule type polycarboxylic acid water reducer;
(2) respectively weighing the following raw materials in formula ratio: aggregate 1050kg/m3380kg/m cement3730kg/m sand39.0kg/m of microcapsule type polycarboxylic acid water reducing agent355kg/m of nano calcium carbonate30.8kg/m basalt fiber3155kg/m of water3
(3) Fully and uniformly mixing the microcapsule type polycarboxylic acid water reducer weighed in the step (2) with water to obtain a mixed solution;
(4) and (3) uniformly mixing and stirring the recycled fine aggregate weighed in the step (2) with water with the weight ratio of 1.8 to prepare recycled mortar, putting the recycled mortar and the aggregate into a stirrer to stir for 30s, then adding the mixed liquid obtained in the step (2) to stir for 120s, finally adding the sand weighed in the step (1), nano calcium carbonate and basalt fiber, and continuously stirring for 120s to obtain the concrete for slip-form casting.
Example 4:
the preparation method of the concrete for slip-form casting specifically comprises the following steps:
(1): stirring and dispersing pore silicon dioxide in a polycarboxylic acid water reducer solution with the solid content of 15%, fully soaking for 22h, filtering, and spray drying to obtain a microcapsule type polycarboxylic acid water reducer;
(2) respectively weighing the following raw materials in formula ratio: aggregate 1025kg/m3385kg/m of cement3740kg/m of sand39.5kg/m of microcapsule type polycarboxylic acid water reducing agent358kg/m of nano calcium carbonate30.9kg/m basalt fiber3158kg/m of water3
(3) Fully and uniformly mixing the microcapsule type polycarboxylic acid water reducer weighed in the step (2) with water to obtain a mixed solution;
(4) and (3) uniformly mixing and stirring the recycled fine aggregate weighed in the step (2) with water with the weight ratio of 1.8 to prepare recycled mortar, putting the recycled mortar and the aggregate into a stirrer to stir for 30s, then adding the mixed liquid obtained in the step (2) to stir for 120s, finally adding the sand weighed in the step (1), nano calcium carbonate and basalt fiber, and continuously stirring for 120s to obtain the concrete for slip-form casting.
Example 5:
the preparation method of the concrete for slip-form casting specifically comprises the following steps:
(1): stirring and dispersing pore silicon dioxide in a polycarboxylic acid water reducer solution with the solid content of 15%, fully soaking for 22h, filtering, and spray drying to obtain a microcapsule type polycarboxylic acid water reducer;
(2) respectively weighing the following raw materials in formula ratio: 1010kg/m aggregate3390kg/m of cement3745kg/m sand39.8kg/m of microcapsule type polycarboxylic acid water reducing agent360kg/m of nano calcium carbonate3Basalt fiber 1.0kg/m3160kg/m of water3
(3) Fully and uniformly mixing the microcapsule type polycarboxylic acid water reducer weighed in the step (2) with water to obtain a mixed solution;
(4) and (3) uniformly mixing and stirring the recycled fine aggregate weighed in the step (2) with water with the weight ratio of 1.8 to prepare recycled mortar, putting the recycled mortar and the aggregate into a stirrer to stir for 30s, then adding the mixed liquid obtained in the step (2) to stir for 120s, finally adding the sand weighed in the step (1), nano calcium carbonate and basalt fiber, and continuously stirring for 120s to obtain the concrete for slip-form casting.
And (3) testing the compressive strength and slump property of the concrete for slip form casting prepared in the embodiment 1-5. The compression strength test is carried out according to the method in section 2.3 of the technical 'mix proportion design and performance research of pervious concrete' of Gancingqing, and specific test results are shown in table 1.
TABLE 1 compressive Strength test results
7d compressive Strength (MPa) 28d compressive Strength (MPa)
Example 1 60.3 75.2
Example 2 62.4 77.3
Example 3 61.5 76.5
Example 4 64.2 79.8
Example 5 64.7 74.8
As can be seen from Table 1, the compressive strength of the slip-form casting concrete prepared by the invention is superior to the performance test standard in the same industry, and the engineering requirements of the slip-form casting concrete can be met.
And (3) slump effect test: the concrete for slip-form casting prepared in the embodiment 1-5 is subjected to slump tests respectively, and the concrete test operation steps are as follows: (1) a horn-shaped slump barrel with an upper opening of 100mm, a lower opening of 200mm and a height of 300mm is used; (2) pouring concrete into the mixture, and filling the mixture for three times; (3) after each filling, uniformly beating 25 times along the barrel wall from outside to inside by using a tamper, tamping and leveling; (4) and pulling up the barrel, wherein the concrete generates a slump phenomenon due to self weight, the height of the highest point of the slump-delayed concrete is subtracted from the barrel height (300mm) to obtain the slump (if the difference value of the barrel height and the concrete is 10mm, the slump is 10), and the slump-reversing time(s) and the slump expansion are recorded. The test results are shown in Table 2.
TABLE 2 slump test results
The test results of the embodiments show that the fresh concrete has excellent working performance, no loss of slump at 2h and good pumpability by optimizing the raw material proportion and the process parameters, and is beneficial to construction.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. The concrete for slip form casting is characterized by being prepared by uniformly stirring the following raw materials in parts by weight by a concrete stirrer, wherein the volume weight of the stirred mixture reaches 2250-2350 kg/m3(ii) a Wherein the aggregate comprises 1000-1100 kg/m of aggregate3350-400 kg/m cement3700-750 kg/m of sand38 to 10kg/m of a microcapsule type polycarboxylic acid water reducing agent340-60 kg/m of nano calcium carbonate30.5 to 1.0kg/m of basalt fiber3140 to 160kg/m of water3
2. The concrete for slipform casting according to claim 1, wherein the microcapsule type polycarboxylic acid water reducer is prepared by the following steps: and stirring and dispersing the carrier with pores in the polycarboxylic acid water reducing agent solution, fully soaking for 20-22 h, filtering, and spray drying to obtain the microcapsule type polycarboxylic acid water reducing agent.
3. The concrete for slip-casting according to claim 2, wherein the porous support is porous silica, porous quartz sand or porous fine sand.
4. The concrete for slipform casting according to claim 3, wherein the solid content of the polycarboxylic acid water reducer solution is 15-20%, and the water reducing rate of the polycarboxylic acid water reducer is more than or equal to 8%.
5. The concrete for slipform casting according to claim 1, wherein the aggregate is crushed stone or pebble with the thickness of 5-10 mm, and the aggregate is doped with 14-16 kg/m3The recycled fine aggregate of (1).
6. The concrete for slipform casting according to claim 5, wherein the recycled fine aggregate is recycled fine aggregate particles with the particle size not more than 4.50mm obtained by crushing and screening waste concrete.
7. The preparation method of the concrete for slip-form casting is characterized by comprising the following steps:
(1) preparing a microcapsule type polycarboxylic acid water reducing agent: stirring and dispersing the carrier with pores in a polycarboxylic acid water reducing agent solution, fully soaking for 20-22 h, filtering, and spray drying to obtain the carrier;
(2) respectively weighing the following raw materials in formula ratio: aggregate 1000-1100 kg/m3350-400 kg/m cement3700-750 kg/m of sand38 to 10kg/m of a microcapsule type polycarboxylic acid water reducing agent340-60 kg/m of nano calcium carbonate30.5 to 1.0kg/m of basalt fiber3140 to 160kg/m of water3
(3) Fully and uniformly mixing the microcapsule type polycarboxylic acid water reducer weighed in the step (2) with water to obtain a mixed solution;
(4) and (3) uniformly mixing and stirring the recycled fine aggregate weighed in the step (2) with water with the weight ratio of 1.5-2.0 to prepare recycled mortar, putting the recycled mortar and the aggregate into a stirrer to stir for 25-35 s, then adding the mixed liquid obtained in the step (2) to stir uniformly, finally adding the sand, the nano calcium carbonate and the basalt fiber weighed in the step (1), and continuously stirring to obtain the concrete for slip-form casting.
8. The method of claim 6, wherein the porous support in step (1) is porous silica, porous quartz sand or porous fine sand.
9. The preparation method of the concrete for slipform casting according to claim 6, characterized in that the solid content of the polycarboxylic acid water reducer solution is 15-20%, and the water reducing rate of the polycarboxylic acid water reducer is more than or equal to 8%.
10. The method for preparing the spongy mass permeable concrete according to claim 7, wherein in the step (3), the stirring time of the second stirring and the third stirring is not less than 120 s.
CN201911330408.4A 2019-01-24 2019-12-20 Concrete for slip form casting and preparation method thereof Pending CN110981309A (en)

Priority Applications (2)

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CN2019100690298 2019-01-24
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103739223A (en) * 2013-12-30 2014-04-23 广东红墙新材料股份有限公司 Slow-release microcapsule concrete admixture and preparation method thereof
CN104944863A (en) * 2015-06-12 2015-09-30 中建商品混凝土西安有限公司 Preparation method for high-strength self-compacting concrete with recycled fine aggregate
CN105541226A (en) * 2015-12-24 2016-05-04 邢台建工商品混凝土有限公司 Concrete for slip form concreting and preparation method thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103739223A (en) * 2013-12-30 2014-04-23 广东红墙新材料股份有限公司 Slow-release microcapsule concrete admixture and preparation method thereof
CN104944863A (en) * 2015-06-12 2015-09-30 中建商品混凝土西安有限公司 Preparation method for high-strength self-compacting concrete with recycled fine aggregate
CN105541226A (en) * 2015-12-24 2016-05-04 邢台建工商品混凝土有限公司 Concrete for slip form concreting and preparation method thereof

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