CN109293289B - Method for preparing concrete with equal strength by recycling concrete laitance - Google Patents
Method for preparing concrete with equal strength by recycling concrete laitance Download PDFInfo
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- CN109293289B CN109293289B CN201811182337.3A CN201811182337A CN109293289B CN 109293289 B CN109293289 B CN 109293289B CN 201811182337 A CN201811182337 A CN 201811182337A CN 109293289 B CN109293289 B CN 109293289B
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- concrete
- laitance
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- furnace slag
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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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- 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 belongs to the technical field of building concrete preparation, and particularly relates to a method for preparing concrete with equal strength by recycling concrete laitance. Aiming at the problems that the laitance generated by the existing building concrete can not be effectively utilized, the production cost is high, the environment is polluted and the like, the invention provides a method for preparing the concrete with the same strength by recycling the concrete laitance, which comprises the following steps: a. pumping out the laitance layer on the surface of the concrete within 90-120 minutes after the concrete is mixed and before initial setting, and continuously stirring the pumped laitance; b. weighing cement and water, adding the cement and water into a stirrer, stirring for 15-25 s, adding the laitance obtained in the step a, stirring for 20-30 s, weighing high-titanium blast furnace slag sand and high-titanium blast furnace slag macadam, adding the high-titanium blast furnace slag sand and the high-titanium blast furnace slag macadam into the stirrer, and stirring for 90-120 s to prepare the new concrete. The method effectively utilizes the concrete laitance to prepare new concrete, saves the cost, protects the environment and has obvious economic benefit.
Description
Technical Field
The invention belongs to the technical field of building concrete preparation, and particularly relates to a method for preparing concrete with equal strength by recycling concrete laitance.
Background
The high titanium type blast furnace slag concrete is a general name of engineering composite materials formed by cementing coarse and fine aggregates of high titanium type blast furnace slag into a whole by cementing materials. Generally, the common raw materials for building high titanium type blast furnace slag concrete are: the high titanium type blast furnace slag coarse gravel, the high titanium type blast furnace slag coarse sand, the fly ash, the additive, the cement and the water are cemented by the cement to form the concrete with the strength of more than C60, and the high titanium type blast furnace slag fly ash can be widely applied to the engineering fields of hydropower, traffic, house building and the like.
The concrete aggregate floats in the cement paste under the buoyancy of the cement paste in a static state, and the particle aggregate can sink and float corresponding to the cement paste only when the difference between the self weight of the concrete aggregate and the weight of the cement paste discharged by the concrete aggregate is greater than the shearing strength of the viscous cement paste. Concrete of various strength grades and gradations is likely to produce concrete laitance during the in-situ placement of concrete, particularly high volume, high flow concrete and pump concrete. The floating slurry is generated because the light mortar floats upwards, the coarse aggregate obviously sinks and is separated in the pouring process of the concrete, and a large amount of bleeding water is secreted on the surface. If the vibrating time and slump increase, the more the laitance is produced. In the current building engineering, fly ash is often added into concrete as an admixture in order to save cement, improve concrete workability, adjust the strength grade of concrete and other factors. In use, the fact that the fly ash is spherical and has a smooth surface, a ball effect is generated under the vibration effect, the weight of the fly ash is relatively light, the fly ash can further float upwards, and then the generation of floating slurry is aggravated, so that the generation of the high-titanium blast furnace slag concrete floating slurry containing the fly ash is more serious.
After the laitance is produced, because its intensity is far less than mother's body concrete intensity, laitance intensity only has 1/3 ~ 1/2 of mother's body concrete intensity, will form the weak layer in concrete structure, influences the holistic intensity of concrete, can't effectively use. At present, when engineering is carried out, the laitance on the surface of the concrete needs to be removed, the laitance is difficult to remove after solidification, time and labor are consumed, the removed laitance cannot be effectively utilized, and only can be used as building slag, so that waste is caused, and the environment is polluted. At present, the floating pulp is inhibited by various means in the industry, but the floating pulp cannot be fundamentally prevented from being generated, and the effect is very little. Therefore, how to effectively utilize the floating slurry, reduce the cost and protect the environment is a problem to be solved urgently in the industry at the present stage.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the existing building concrete can not effectively utilize the floating slurry, has high production cost, pollutes the environment and the like.
The technical scheme for solving the technical problems comprises the following steps: provides a method for preparing concrete with equal strength by recycling concrete laitance. The method comprises the following steps:
a. pumping out the laitance layer on the surface of the concrete within 90-120 minutes after the concrete is mixed and before initial setting, and continuously stirring the pumped laitance; the strength of the concrete is 29.53-32.76 Mpa;
b. weighing cement and water, adding the cement and water into a stirrer to stir for 15-25 s, then adding the laitance obtained in the step a to stir for 20-30 s, then weighing high-titanium blast furnace slag sand and high-titanium blast furnace slag macadam, adding the mixture into the stirrer to stir for 90-120 s, and thus obtaining new concrete; the new concrete strength is 30.02-32.66 Mpa.
In the method for preparing the concrete with the same strength by recycling the concrete laitance, the concrete in the step a comprises the following components: the high titanium blast furnace slag comprises, by weight, 13.5-15.5% of cement, 7-9% of water, 30-33% of high titanium blast furnace slag sand and 41-43% of high titanium blast furnace slag macadam.
In the method for preparing the concrete with the same strength by recycling the concrete laitance, the bulk density of the high-titanium blast furnace slag sand is 1650-1750 kg/m3The slag powder content is 6-6.5%, the grain composition meets the II area, and the fineness modulus is 2.55-2.65.
In the method for preparing the concrete with the same strength by recycling the concrete laitance, the bulk density of the high-titanium blast furnace slag macadam is 1260-1360 kg/m3The particle size is 5-25 mm.
Further, in the method for preparing the concrete with the same strength by recycling the concrete laitance, the concrete further comprises the following components: fly ash accounting for 27-29% of the weight of the cement.
Furthermore, in the method for preparing the concrete with the same strength by recycling the concrete laitance, the concrete further comprises the following components: and the polycarboxylic acid high-performance water reducing agent JY-PC accounts for 2-2.5% of the total weight of the cement and the fly ash.
In the method for preparing the concrete with the same strength by recycling the concrete laitance, the stirring speed in the step a is 30-50 r/min.
In the method for preparing the concrete with the same strength by recycling the concrete laitance, the laitance in the step a comprises the following components: according to weight percentage, 32.41-36.36% of cement, 26.5-29.5% of fly ash and 36.1-39.04% of high titanium type blast furnace slag sand slag powder.
Further, the strength of the laitance in the step a is 13.48-16.52 MPa.
In the method for preparing the concrete with the same strength by recycling the concrete laitance, the addition amount of the cement in the step b is 23.50 to 25.17 percent of the weight of the laitance; the addition amount of the water is 14.25-14.69% of the weight of the floating slurry; the addition amount of the high titanium blast furnace slag sand is 1.20-1.25 times of the weight of the floating slurry; the addition amount of the high-titanium type blast furnace slag stone is 1.60-1.65 times of the weight of the floating slurry.
The invention has the beneficial effects that: in the invention, in a short period of time after the concrete consisting of the fly ash and the high-titanium blast furnace slag sand is mixed, the concrete is not initially solidified, the laitance is scooped out by adopting a specific method, and then the raw materials such as cement, water, the high-titanium blast furnace slag sand, the high-titanium blast furnace slag macadam and the like are added according to a certain proportion requirement to prepare a new concrete material. The proportion of newly added cement, water, high-titanium blast furnace slag sand and high-titanium blast furnace slag crushed stone is reasonably limited, so that the strength of the prepared new concrete is 30.02-32.66 Mpa, and the prepared new concrete can be used for aspects such as building engineering structures, pavement engineering, hydraulic and hydroelectric engineering and the like. The invention effectively utilizes the concrete laitance to prepare new concrete, saves cost, protects environment and has obvious economic benefit.
Detailed Description
The invention provides a method for preparing concrete with equal strength by recycling concrete laitance, which comprises the following steps:
a. pumping out the laitance layer on the surface of the concrete within 90-120 minutes after the concrete is mixed and before initial setting, and continuously stirring the pumped laitance; the strength of the concrete is 29.53-32.76 Mpa;
b. weighing cement and water, adding the cement and water into a stirrer to stir for 15-25 s, then adding the laitance obtained in the step a to stir for 20-30 s, then weighing high-titanium blast furnace slag sand and high-titanium blast furnace slag macadam, adding the mixture into the stirrer to stir for 90-120 s, and thus obtaining new concrete; the new concrete strength is 30.02-32.66 Mpa.
In the method for preparing the concrete with the same strength by recycling the concrete laitance, the concrete in the step a comprises the following components: the high titanium blast furnace slag comprises, by weight, 13.5-15.5% of cement, 7-9% of water, 30-33% of high titanium blast furnace slag sand and 41-43% of high titanium blast furnace slag macadam.
Further, in the method for preparing the concrete with the same strength by recycling the concrete laitance, the concrete further comprises the following components: fly ash accounting for 27-29% of the weight of the cement.
Furthermore, in the method for preparing the concrete with the same strength by recycling the concrete laitance, the concrete further comprises the following components: and the polycarboxylic acid high-performance water reducing agent JY-PC accounts for 2-2.5% of the total weight of the cement and the fly ash.
The high titanium type blast furnace slag concrete with the composition is selected because the high titanium type blast furnace slag concrete is easy to generate floating slurry, the floating slurry generation amount is large, the effective utilization is difficult, and the utilized space is larger. In fact, the present method can be used to utilize the laitance as long as the building concrete is capable of producing the laitance. The laitance generated by the building concrete with other compositions can be reasonably added with the original composition substances for utilization according to the composition of the building concrete.
Wherein, in order to prevent the floating slurry from layering, segregation and solidification, the stirring speed in the step a is 30-50 r/min.
In the method for preparing the concrete with the same strength by recycling the concrete laitance, the bulk density of the high-titanium blast furnace slag sand is 1650-1750 kg/m3The slag powder content is 6-6.5%, the grain composition meets the II area, and the fineness modulus is 2.55-2.65.
In the method for preparing the concrete with the same strength by recycling the concrete laitance, the bulk density of the high-titanium blast furnace slag macadam is 1260-1360 kg/m3The particle size is 5-25 mm.
In the method for preparing the concrete with the same strength by recycling the concrete laitance, the laitance in the step a comprises the following components: according to weight percentage, 32.41-36.36% of cement, 26.5-29.5% of fly ash and 36.1-39.04% of high titanium type blast furnace slag sand slag powder. The high titanium type blast furnace slag sand powder refers to fine powder in high titanium type blast furnace slag sand and exists in floating slurry.
Further, the strength of the laitance in the step a is 13.48-16.52 MPa.
In the method for preparing the concrete with the same strength by recycling the concrete laitance, the addition amount of the cement in the step b is 23.50 to 25.17 percent of the weight of the laitance; the addition amount of the water is 14.25-14.69% of the weight of the floating slurry; the addition amount of the high titanium blast furnace slag sand is 1.20-1.25 times of the weight of the floating slurry; the addition amount of the high-titanium type blast furnace slag stone is 1.60-1.65 times of the weight of the floating slurry. Preferably, the cement added in step b is of the same type as the cement in the concrete composition of step a.
Wherein, in order to effectively mix the concrete prepared by the laitance with the mother concrete for use or be applied to the aspects of building construction engineering structures, pavement engineering, hydraulic and hydroelectric engineering and the like according to the C30 strength grade.
Because the concrete laitance contains almost no coarse and fine aggregates (broken stones and sands) and has strength far lower than that of the mother concrete, a weak layer is formed in a concrete structure, concrete laitance components generated by concrete with different raw materials, proportions and strength grades are different, and particularly, the cement and fly ash content in the laitance is not fixed, the quality of the new concrete prepared by directly adding sands and stone materials into the concrete laitance cannot be ensured, and the application of the new concrete cannot be realized. The invention firstly uses the means of material discipline to detect the floating slurry component of the high titanium type blast furnace slag fly ash concrete, determines the component and the content thereof, then uses the method of civil engineering material concrete mixing proportion to prepare new concrete, and detects that the strength thereof meets the requirement.
The following examples are intended to illustrate specific embodiments of the present invention without limiting the scope of the invention to the examples.
The high titanium type blast furnace slag concrete used in the examples had the following composition: according to the weight percentage, the cement is 13.93%, the water is 8.07%, the high-titanium blast furnace slag sand is 31.69%, the high-titanium blast furnace slag broken stone is 41.98%, the fly ash accounts for 28.12% of the using amount of the cement, and the polycarboxylic acid high-performance water reducing agent JY-PC accounts for 2.3% of the sum of the using amounts of the cement and the fly ash.
Example 1 Recycling of building concrete laitance Using the method of the invention
The specific operation process is as follows:
a. pumping out the laitance layer on the surface of the concrete within 90 minutes after the concrete is mixed and before the initial setting, and continuously stirring the pumped laitance at the speed of 30 r/min; obtaining 642kg of floating pulp;
b. weighing 150.87kg of cement and 91.49kg of water, adding the cement and the water into a stirrer, stirring for 15s, adding the laitance obtained in the step a, stirring for 20s, weighing 786kg of high-titanium blast furnace slag sand and 1040kg of high-titanium blast furnace slag macadam, adding the materials into the stirrer, and stirring for 90s to prepare the new concrete.
After standard curing 28, the new concrete obtained in example 1 has a compressive strength of 30.02MPa, which is basically equivalent to that of the parent concrete and can be mixed with the parent concrete or used according to the strength grade of C30 concrete, according to the test of GB/T50081-2002 Standard test methods for mechanical properties of ordinary concrete.
Example 2 Recycling of building concrete laitance Using the method of the invention
The specific operation process is as follows:
a. pumping out the laitance layer on the surface of the concrete within 120 minutes after the concrete is mixed and before the initial setting, and continuously stirring the pumped laitance at the speed of 50 r/min; obtaining 642kg of floating pulp;
b. weighing 155.65kg of cement and 92.96kg of water, adding the cement and the water into a stirrer, stirring for 25s, adding the laitance obtained in the step a, stirring for 30s, weighing 786kg of high-titanium blast furnace slag sand and 1040kg of high-titanium blast furnace slag macadam, adding the materials into the stirrer, and stirring for 120s to prepare the new concrete.
After standard curing 28, the new concrete obtained in example 2 has a compressive strength of 31.28MPa, which is basically equivalent to that of the parent concrete and can be mixed with the parent concrete or used according to the strength grade of C30 concrete, according to the test of GB/T50081-2002 Standard test methods for mechanical properties of ordinary concrete.
Example 3 Recycling of building concrete laitance Using the method of the invention
The specific operation process is as follows:
a. pumping out the laitance layer on the surface of the concrete within 90 minutes after the concrete is mixed and before the initial setting, and continuously stirring the pumped laitance at the speed of 40 r/min; obtaining 642kg of floating pulp;
b. weighing 161.59kg of cement and 94.31kg of water, adding the cement and the water into a stirrer, stirring for 20s, adding the laitance obtained in the step a, stirring for 25s, weighing 786kg of high-titanium blast furnace slag sand and 1040kg of high-titanium blast furnace slag macadam, adding the materials into the stirrer, and stirring for 105s to prepare the new concrete.
After standard curing 28, the new concrete obtained in example 3 has a compressive strength of 32.66MPa, which is basically equivalent to the strength of the parent concrete and can be mixed with the parent concrete or used according to the strength grade of C30 concrete, according to the test of GB/T50081-2002 Standard test methods for mechanical properties of ordinary concrete.
In summary, the invention provides a method for recycling high-titanium type blast furnace slag concrete laitance, which comprises the steps of pumping out the concrete laitance, adding the original concrete raw materials in proper proportion into the laitance, adjusting the raw material proportion, obtaining the new concrete with the strength of 30.02-32.66 Mpa, and effectively mixing the new concrete with the mother concrete for use or applying the new concrete to the aspects of building engineering structures, pavement engineering, water conservancy and hydropower engineering and the like according to the C30 strength grade. The method recycles the concrete laitance, obviously reduces the production cost and is worth popularizing and using.
Claims (4)
1. The method for preparing the concrete with the same strength by recycling the concrete laitance is characterized by comprising the following steps:
a. pumping out the laitance layer on the surface of the concrete within 90-120 minutes after the concrete is mixed and before initial setting, and continuously stirring the pumped laitance; the strength of the concrete is 29.53-32.76 Mpa; the concrete comprises the following components: 13.5-15.5% of cement, 7-9% of water, 30-33% of high titanium type blast furnace slag sand, 41-43% of high titanium type blast furnace slag macadam and the like by weight percentage, and the cement further comprises: fly ash accounting for 27-29% of the weight of the cement;
b. weighing cement and water, adding the cement and water into a stirrer to stir for 15-25 s, then adding the laitance obtained in the step a to stir for 20-30 s, then weighing high-titanium blast furnace slag sand and high-titanium blast furnace slag macadam, adding the mixture into the stirrer to stir for 90-120 s, and thus obtaining new concrete; the new concrete strength is 30.02-32.66 Mpa; the addition amount of the cement is 23.50-25.17% of the weight of the floating slurry; the addition amount of the water is 14.25-14.69% of the weight of the floating slurry; the addition amount of the high titanium blast furnace slag sand is 1.20-1.25 times of the weight of the floating slurry; the addition amount of the high titanium type blast furnace slag macadam is 1.60-1.65 times of the weight of the laitance.
2. The method for preparing concrete with equal strength by recycling the concrete laitance according to claim 1, which is characterized in that: the concrete of step a also comprises the following components: and the polycarboxylic acid high-performance water reducing agent JY-PC accounts for 2-2.5% of the total weight of the cement and the fly ash.
3. The method for preparing concrete with equal strength by recycling the concrete laitance according to claim 1, which is characterized in that: the stirring speed in the step a is 30-50 r/min.
4. The method for preparing concrete with equal strength by recycling the concrete laitance according to claim 1, which is characterized in that: the floating pulp in the step a comprises the following components: according to weight percentage, 32.41-36.36% of cement, 26.5-29.5% of fly ash and 36.1-39.04% of high titanium type blast furnace slag sand slag powder.
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| CN111364468B (en) * | 2020-03-18 | 2022-12-30 | 重庆交通建设(集团)有限责任公司 | Bridge pile foundation concrete pouring equipment and process applied to water accumulation area |
| CN113199630B (en) * | 2021-04-02 | 2023-04-07 | 保定市利安道路工程有限公司 | High titanium type blast furnace slag concrete laitance recycle preparation facilities |
| CN113322962A (en) * | 2021-05-19 | 2021-08-31 | 广东省建筑工程集团有限公司 | Construction method for treating floating slurry of pile head of cast-in-place pile |
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| JP2602048B2 (en) * | 1988-02-10 | 1997-04-23 | 三洋化成工業株式会社 | Cement additives and compositions |
| JP2949680B2 (en) * | 1992-09-03 | 1999-09-20 | 株式会社フジタ | Green cutting work method |
| CN101235638B (en) * | 2008-01-07 | 2010-06-02 | 中山市三和建材有限公司 | Concrete pipe pile |
| CN103171021A (en) * | 2011-12-23 | 2013-06-26 | 贵州中建建筑科研设计院有限公司 | Method for enhancing concrete strength, improving volume stability and reducing cracking |
| CN102677902A (en) * | 2012-05-12 | 2012-09-19 | 中国十七冶集团有限公司 | Method for improving construction quality of mortar layer on top of pump concrete |
| CN103482911B (en) * | 2013-09-06 | 2015-06-17 | 攀枝花学院 | High-titanium type blast furnace slag concrete hollow brick |
| CN105645800A (en) * | 2015-12-31 | 2016-06-08 | 中建商品混凝土成都有限公司 | Waste slurry recycling and reusing technology of concrete mixing station |
| US9957673B1 (en) * | 2016-11-01 | 2018-05-01 | Classic Turf Company LLC | Post-tension running track |
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