CN110759652A - High-strength cement for underwater operation - Google Patents
High-strength cement for underwater operation Download PDFInfo
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- CN110759652A CN110759652A CN201911178269.8A CN201911178269A CN110759652A CN 110759652 A CN110759652 A CN 110759652A CN 201911178269 A CN201911178269 A CN 201911178269A CN 110759652 A CN110759652 A CN 110759652A
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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
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
-
- 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
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
A high-strength cement for underwater operation comprises, by weight, clinker, lead-copper slag, a set accelerating early strength agent, a flocculating agent and a thickening agent; the coagulation accelerator early strength agent comprises hydration accelerator powder, 0.5-3 parts of NaOH and 0.5-3 parts of Na according to parts by weight2SiO3Uniformly mixing the components, wherein the hydration promoter powder comprises 10-60 wt% of triethanolamine, 5-30 wt% of triisopropanolamine and 5-30 wt% of glycol; the thickener is methyl hydroxypropyl cellulose. In the invention, the thickening agent can solve the problem of concrete bleeding after slag cement forms concrete, and the appearance quality and durability of the structure are ensured by solving the problem of slag cement concrete bleeding, so that the service life of the building can reach the expected life. Meanwhile, the coagulation accelerating early strength agent can improve the early strength of the concrete.
Description
Technical Field
The invention relates to the technical field of civil construction materials, in particular to high-strength cement for underwater operation.
Background
The concrete is an indispensable building material for underwater construction engineering, the main reason that the concrete is not dispersed underwater is that a non-dispersant, namely a flocculating agent, is added into the concrete, and in order to prepare the underwater non-dispersible concrete with good performance, the materials of all the components of the concrete need to be reasonably selected.
During underwater operation, concrete is usually transported for a long time, the phenomenon that coarse aggregate sinks and water floats in the transportation, vibration and pumping processes is called concrete bleeding, and no bleeding indicates that the performance of the concrete is stable, so the bleeding is an important performance characteristic of the working performance of fresh concrete. This characteristic is particularly important in underwater concrete because if severe concrete bleeding occurs, the concrete tends to disperse locally under water, thereby causing concrete strength problems. Meanwhile, as slag is added into the existing concrete and the thickness of the slag cannot reach the thickness of clinker, the water retention performance of the concrete is poor, so that the concrete cannot resist bleeding.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the high-strength cement for underwater operation, which has stable underwater state and low pressure bleeding rate of formed concrete.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: a high-strength cement for underwater operation comprises, by weight, 40-70 parts of clinker, 20-30 parts of lead-copper slag, 2-8 parts of a set accelerating early strength agent, 0.1-0.5 part of a flocculating agent and 0.05-0.5 part of a thickening agent; the coagulation accelerator early strength agent comprises 1 to 5 parts of hydration accelerator powder, 0.5 to 3 parts of NaOH and 0.5 to 3 parts of Na by weight2SiO3Uniformly mixing the components, wherein the hydration promoter powder comprises 10-60 wt% of triethanolamine, 5-30 wt% of triisopropanolamine and 5-30 wt% of ethylene glycol; the thickening agent is methyl hydroxypropyl cellulose with molecular weight more than 5 ten thousand.
Preferably, the set accelerating early strength agent is formed by hydration accelerator powder, NaOH and Na2SiO3Is obtained by water milling and heat treatment activation.
The high-strength cement for underwater operation preferably comprises 20 to 50 parts by weight of polydimethyldiallylammonium chloride powder; 0-0.01 part of sodium dodecyl sulfate and 4-8 parts of hydrated lime powder.
The high-strength cement for underwater operation preferably further comprises 5 to 10 parts by weight of gypsum.
A preparation method of high-strength cement for underwater operation comprises the following steps,
1) the preparation of the coagulation accelerator early strength agent is that 1 to 5 portions of clinker, 0.5 to 3 portions of NaOH and 0.5 to 3 portions of Na2SiO3And 20-30 parts of water are ball-milled and dried at the temperature of 80-100 ℃, then dry-milled for 60-120min, and the powder with the particle size of 50-100 mu m is calcined for 1-3 h in a calcining furnace, wherein the calcining temperature is 550-; after calcination, the coagulation accelerating early strength agent is obtained for standby;
2) 40-70 parts of clinker and 20-30 parts of lead-copper slag are ground to 50-100 mu m,
3) 2-8 parts of the set accelerating early strength agent, 0.1-0.5 part of the flocculating agent and 0.05-0.5 part of the thickening agent are added into the powder obtained in the step 2) and continuously ground to obtain a specific surface area of 600m 2/kg.
In the above method for preparing high-strength cement for underwater operation, preferably, the grinding in step 3) is dry grinding.
Compared with the prior art, the invention has the advantages that: in the invention, the thickening agent can solve the problem of concrete bleeding after slag cement forms concrete, and the appearance quality and durability of the structure are ensured by solving the problem of slag cement concrete bleeding, so that the service life of the building can reach the expected life. Meanwhile, the coagulation accelerating early strength agent can improve the early strength of the concrete.
Detailed Description
In order to facilitate an understanding of the present invention, the present invention will be described more fully and in detail with reference to the preferred embodiments, but the scope of the present invention is not limited to the specific embodiments described below.
It should be particularly noted that when an element is referred to as being "fixed to, connected to or communicated with" another element, it can be directly fixed to, connected to or communicated with the other element or indirectly fixed to, connected to or communicated with the other element through other intermediate connecting components.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Examples
A high-strength cement for underwater operation comprises, by weight, 40-70 parts of clinker, 20-30 parts of lead-copper slag, 2-8 parts of a set accelerating early strength agent, 5-10 parts of gypsum, 0.1-0.5 part of a flocculating agent and 0.05-0.5 part of a thickening agent; the coagulation accelerator early strength agent comprises 1 to 5 parts of hydration accelerator powder, 0.5 to 3 parts of NaOH and 0.5 to 3 parts of Na by weight2SiO3Uniformly mixing the components, wherein the hydration promoter powder comprises 10-60 wt% of triethanolamine, 5-30 wt% of triisopropanolamine and 5-30 wt% of ethylene glycol; the thickening agent is methyl hydroxypropyl cellulose with molecular weight more than 5 ten thousand. The coagulation-accelerating early strength agent is prepared from hydration promoter powder, NaOH and Na2SiO3Is obtained by water milling and heat treatment activation.
In the embodiment, the flocculant comprises 20-50 parts by weight of poly dimethyl diallyl ammonium chloride powder; 0-0.01 part of sodium dodecyl sulfate and 4-8 parts of hydrated lime powder.
In the embodiment, the comprehensive use of the flocculating agent and the thickening agent can ensure that the concrete produced in the later stage is not separated when meeting water, is not dispersed under water, has short setting time, and has excellent durability while ensuring the strength of a concrete structure. The early strength of the concrete of the invention under water can be enhanced by the use of the accelerating early strength agent.
In the embodiment, after the coagulation accelerating early strength agent is stirred in water, because the PH of the concrete is alkaline, gypsum and SiO are mixed in the stirring process3 2-The cement clinker aggregate, the clinker aggregate and metal ions in the slag aggregate can form a gel-like compact net structure, and the net structure of the methylhydroxypropylcellulose is added, so that the underwater performance of the concrete is very stable, the pressure bleeding rate of the concrete is low, the pressure bleeding rate of the concrete is less than 0.15%, and the load-bearing pressure of a pressure bleeding instrument is set to be 1.0 MPa.
A preparation method of high-strength cement for underwater operation comprises the following steps,
1) the preparation of the coagulation accelerating early strength agent comprises the steps of ball-milling 1-5 parts of clinker, 0.5-3 parts of NaOH, 0.5-3 parts of Na2SiO3 and 20-30 parts of water at the temperature of 80-100 ℃, drying, then carrying out dry grinding for 60-120min, screening out 50-100 mu m powder, calcining for 1-3 hours in a calcining furnace, and calcining at the temperature of 550-650 ℃; after calcination, the coagulation accelerating early strength agent is obtained for standby;
2) 40-70 parts of clinker, 20-30 parts of lead-copper slag and 5-10 parts of gypsum are ground to 50-100 mu m,
3) adding 2-8 parts of coagulation accelerating early strength agent, 0.1-0.5 part of flocculating agent and 0.05-0.5 part of thickening agent into the powder obtained in the step 2), and continuously grinding until the specific surface area is 500-600m2/㎏。
Example 1
1) 3 portions of clinker, 0.5 to 3 portions of NaOH and 2 portions of Na2SiO3And 15 parts of water are ball-milled and dried at the temperature of 80-100 ℃, then dry-milled for 60-120min, and the powder with the particle size of 50-100 mu m is calcined for 1-3 h in a calcining furnace, wherein the calcining temperature is 550-650 ℃; after calcination, the coagulation accelerating early strength agent is obtained for standby;
2) 50 parts of clinker, 25 parts of lead-copper slag and 8 parts of gypsum are ground to 50-100 mu m,
3) 8 parts of set accelerating early strength agent, 0.3 part of flocculating agent and 0.2 part of thickening agent are added into the powder obtained in the step 2) and are continuously ground until the specific surface area is 500 + 600m2 kg. Obtaining the cement.
Mixing 500 parts by weight of sand and 500 parts by weight of the cement of this example in a concrete mixer,
detecting the concrete by adopting DLT 5117-2000 'test procedure for non-dispersive underwater concrete';
anti-dispersion performance: the intensity ratio of 7 days to 28 days to 76% and 84% respectively.
Slump retention: the concrete is not dispersed under water and is still for 1 hour, and the slump loss is basically avoided.
The workability of the concrete is excellent, and the segregation and bleeding phenomena are avoided
The freeze-thaw resistance and the carbonization resistance are obviously superior to those of common concrete.
Claims (6)
1. A high strength cement for underwater operations, characterized by: according to the weight portion, the material comprises 40-70 portions of clinker, 20-30 portions of lead-copper slag and 2-8 portions of promoterCoagulating early strength agent, 0.1-0.5 weight part of flocculating agent and 0.05-0.5 weight part of thickening agent; the coagulation accelerator early strength agent comprises 1 to 5 parts of hydration accelerator powder, 0.5 to 3 parts of NaOH and 0.5 to 3 parts of Na by weight2SiO3Uniformly mixing the components, wherein the hydration promoter powder comprises 10-60 wt% of triethanolamine, 5-30 wt% of triisopropanolamine and 5-30 wt% of ethylene glycol; the thickening agent is methyl hydroxypropyl cellulose with molecular weight more than 5 ten thousand.
2. The high strength cement for underwater operations of claim 1, wherein: the coagulation-accelerating early strength agent is prepared from hydration promoter powder, NaOH and Na2SiO3Is obtained by water milling and heat treatment activation.
3. The high strength cement for underwater operations of claim 1, wherein: the flocculant comprises 20-50 parts by weight of poly dimethyl diallyl ammonium chloride powder; 0-0.01 part of sodium dodecyl sulfate and 4-8 parts of hydrated lime powder.
4. The high strength cement for underwater operations of claim 1, wherein: also comprises 5 to 10 portions of gypsum according to the weight portion.
5. A preparation method of high-strength cement for underwater operation is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
1) the preparation of the coagulation accelerator early strength agent is that 1 to 5 portions of clinker, 0.5 to 3 portions of NaOH and 0.5 to 3 portions of Na2SiO3And 20-30 parts of water are ball-milled and dried at the temperature of 80-100 ℃, then dry-milled for 60-120min, and the powder with the particle size of 50-100 mu m is calcined for 1-3 h in a calcining furnace, wherein the calcining temperature is 550-; after calcination, the coagulation accelerating early strength agent is obtained for standby;
2) 40-70 parts of clinker and 20-30 parts of lead-copper slag are ground to 50-100 mu m,
3) adding 2-8 parts of coagulation accelerating early strength agent, 0.1-0.5 part of flocculating agent and 0.05-0.5 part of thickening agent into the powder obtained in the step 2), continuously grinding,grinding to a specific surface area of 500-600m2/㎏。
6. The method for preparing a high strength cement for underwater work according to claim 5, wherein: the grinding in the step 3) is dry grinding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911178269.8A CN110759652A (en) | 2019-11-27 | 2019-11-27 | High-strength cement for underwater operation |
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| CN201911178269.8A CN110759652A (en) | 2019-11-27 | 2019-11-27 | High-strength cement for underwater operation |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0439372B1 (en) * | 1990-01-26 | 1996-04-17 | Blue Circle Industries Plc | Cementitious composition and making concrete therefrom |
| CN101671133A (en) * | 2009-09-30 | 2010-03-17 | 永州市中大特种水泥有限责任公司 | Modified low-alkalinity sulphoaluminate cement |
| CN108203262A (en) * | 2016-12-20 | 2018-06-26 | 大连理工大学 | A kind of preparation method of high-durability non-dispersible underwater concrete |
| CN108203256A (en) * | 2016-12-20 | 2018-06-26 | 大连理工大学 | A kind of flocculant for high intensity non-dispersible underwater concrete |
| CN110104984A (en) * | 2019-05-07 | 2019-08-09 | 武汉理工大学 | A kind of ardealite slag cements early strength coagulant based on modified composite dewatering phase |
-
2019
- 2019-11-27 CN CN201911178269.8A patent/CN110759652A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0439372B1 (en) * | 1990-01-26 | 1996-04-17 | Blue Circle Industries Plc | Cementitious composition and making concrete therefrom |
| CN101671133A (en) * | 2009-09-30 | 2010-03-17 | 永州市中大特种水泥有限责任公司 | Modified low-alkalinity sulphoaluminate cement |
| CN108203262A (en) * | 2016-12-20 | 2018-06-26 | 大连理工大学 | A kind of preparation method of high-durability non-dispersible underwater concrete |
| CN108203256A (en) * | 2016-12-20 | 2018-06-26 | 大连理工大学 | A kind of flocculant for high intensity non-dispersible underwater concrete |
| CN110104984A (en) * | 2019-05-07 | 2019-08-09 | 武汉理工大学 | A kind of ardealite slag cements early strength coagulant based on modified composite dewatering phase |
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