CN114213042A - Double-fast sulphoaluminate cement for fast setting and fast strengthening in severe cold environment and preparation method and use method thereof - Google Patents
Double-fast sulphoaluminate cement for fast setting and fast strengthening in severe cold environment and preparation method and use method thereof Download PDFInfo
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- CN114213042A CN114213042A CN202111609356.1A CN202111609356A CN114213042A CN 114213042 A CN114213042 A CN 114213042A CN 202111609356 A CN202111609356 A CN 202111609356A CN 114213042 A CN114213042 A CN 114213042A
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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
- C04B7/32—Aluminous cements
- C04B7/323—Calcium aluminosulfate cements, e.g. cements hydrating into ettringite
Abstract
The invention provides a fast-setting and fast-hardening dual-fast sulphoaluminate cement for a cementing material in a severe cold environment, which has the compressive strength of more than 10MPa in the severe cold environment at the temperature of-20 to-30 ℃ after construction, meets the early strength development of the cementing material in emergency repair and rush construction engineering, has simple preparation process and strong constructability, and is suitable for fast-setting and rush construction of engineering structures such as roads, highways, bridge floors, runways and the like in the severe cold environment. The fast-curing sulphoaluminate cement is characterized in that a nucleating agent and an accelerating agent are added into a main material to serve as a cement initial hydration inducer, an antifreezing agent is added to serve as a snow-melting and deicing component, a heating material, an energy storage material, an air entraining agent and a heat insulation material are added to serve as heat release and heat insulation components, and fast hydrating minerals are added to serve as continuous hydrating agents; the main materials comprise sulphoaluminate cement clinker, limestone and anhydrous gypsum.
Description
Technical Field
The invention relates to the field of building materials, in particular to a fast-setting and fast-hardening dual-fast sulphoaluminate cement in a severe cold environment.
Technical Field
At present, how to develop a material suitable for rush repair and rush construction work under severe cold environment (such as minus 20 ℃) is a technical problem in the field of engineering materials, and the main difficulties are as follows:
firstly, in a severe cold environment, the sulphoaluminate cement-based material is slow in setting and hardening speed and even cannot be normally set and hardened. Research shows that when the curing temperature of the concrete is reduced from 20 ℃ to 10 ℃, the setting time of the concrete is doubled, when the curing temperature is reduced to-5 ℃, the compressive strength is lost by more than 50% in the later period, when the temperature is reduced to about-15 ℃, the hydration reaction is completely stopped because the free water is almost completely frozen, and meanwhile, the concrete is subjected to structural damage caused by frost heaving due to internal stress generated by freezing of the free water (the volume is increased by about 9%) in macropores.
Secondly, the construction and maintenance measures of the cement-based material under the negative temperature environment are complex. The common concrete winter construction methods have the problems of complex construction and maintenance measures and the like, are not beneficial to the rapid implementation of rush repair and rush construction, and are difficult to meet the requirements of rapid repair engineering.
The mixing water is very difficult to obtain, and the efficiency of obtaining the mixing water by heating and other modes is extremely low; concrete mixing water is difficult to obtain in a severe cold environment, and meanwhile snow melting and ice melting efficiency is low, so that the rapid implementation of repair engineering is not facilitated.
And fourthly, the inorganic cementing material which can be quickly set and hardened in a severe cold environment is lacked. The inorganic material is mainly quick-hardening high-strength series cement, including high-alumina cement, quick-hardening sulphoaluminate cement, double-quick-hardening cement, geopolymer cement, phosphate cement, etc. The high-alumina cement has high early strength which can reach more than 35MPa in 1 day, good sulfate resistance, extremely poor alkali resistance, unstable long-term performance, short storage time and low hour strength. The double-quick fluoroaluminate cement has the advantages of quick setting and hardening, high hour strength, short storage time, no high temperature resistance and low negative temperature strength. The geopolymer cement has fast hardening, early strength and good sulfate corrosion resistance, but the high alkalinity of the geopolymer cement easily causes alkali-aggregate reaction. The phosphate cement has high cost and is not suitable for large-scale popularization.
The early strength of the quick-hardening sulphoaluminate cement is high, the strength of the mortar is 20-30 MPa after 12 hours, and the frost resistance is good. The other two unique characteristics are that the negative temperature hardening and the alkalinity are low, the hydration hardening can still be carried out at low temperature (15-25 ℃), and the liquid phase alkalinity is low (the pH value is 10.5-11.5). But the powder is easy to generate and crack, the storage time is short, the high temperature resistance is not realized, the hour strength is low, and the negative temperature strength is lower.
In conclusion, the early strength of the existing double-fast sulphoaluminate cement in a severe cold environment is lower, and the implementation of rush repair and rush construction engineering is severely limited. Although partial negative temperature hardening performance exists, the distance between the double-fast sulphoaluminate cement and the double-fast sulphoaluminate cement reaches the standard of rush repair and rush construction, so that a method which can be used for rush repair and rush construction in severe cold environment, has universality on the double-fast sulphoaluminate cement and is convenient for industrial production is necessary, and has very important economic significance for accelerating the construction rate of rush repair and rush construction engineering in winter and reducing the cost of the rush repair and rush construction engineering in winter; has obvious social significance for accelerating the application and popularization of the double-fast sulphoaluminate cement in the field of emergency repair and rush construction.
Disclosure of Invention
The invention aims to provide the quick-setting and early-strength quick-hardening sulphoaluminate cement (the double-quick-setting sulphoaluminate cement) with the compressive strength of 2 hours after construction reaching more than 10MPa in a severe cold environment at the temperature of minus 20 ℃ to minus 30 ℃ and meeting the requirement of the construction project for the early strength development of the cementing material in the severe cold environment.
The invention solves four technical problems that the sulphoaluminate cement cannot be rapidly hardened and early strengthened in a severe cold environment: the invention provides a complete solution by solving the four problems progressively, namely how to provide the hydration conditions of the sulphoaluminate cement, how to solve the mixing water, how to be applicable to a hydration system of the double-speed sulphoaluminate cement and how to hydrate quickly in a severe cold environment. The severe cold environment described in this patent refers to an environment at a temperature of about-20 ℃ to-30 ℃.
The invention relates to a fast-setting and fast-strengthening double-fast sulphoaluminate cement used in a severe cold environment, wherein a nucleating agent and a quick-setting agent are added into a main material to serve as a cement initial hydration inducer, an antifreezing agent is added to serve as a snow-melting and deicing component, a heating material, an energy storage material, an air entraining agent and a heat insulation material are added to serve as heat release and heat insulation components, and a fast hydration mineral is added to serve as a continuous hydration agent; the main materials comprise sulphoaluminate cement clinker, limestone and anhydrous gypsum.
The main material of the double-quick sulphoaluminate cement comprises, by mass, 50-80 parts of sulphoaluminate cement clinker, 15-35 parts of limestone and 5-15 parts of anhydrous gypsum. The main material also comprises a retarder, and the retarder is not higher than 0.5 part based on 100 parts of sulphoaluminate cement clinker, limestone and anhydrous gypsum. The content of calcium oxide in the limestone is not less than 50 percent, and the content of magnesium oxide in the limestone is less than 1.5 percent; the sulfur trioxide content in the anhydrous gypsum is not lower than 45%; the retarder is sodium gluconate, and the effective component is not less than 85%.
The double-fast sulphoaluminate cement is prepared by adding the following additive materials in parts by mass based on 100 parts by mass of the main material, in a ratio of the main material to the fast sulphoaluminate cement:
0-0.06 time of the early strength agent;
0.003-0.015 time of nucleating agent;
0.01-0.05 time of accelerator;
1-6 times of an antifreezing agent;
4-15 times of heating materials;
3-8 times of energy storage material;
0.01-0.03 time of air entraining agent;
3-10 times of heat insulation material;
3-15 times of rapidly hydrated minerals.
The early strength agent of the double-fast sulphoaluminate cement comprises sodium silicate, sodium aluminate, aluminum sulfate or potassium aluminum sulfate. The substances can react with minerals in the sulphoaluminate cement to promote hydration and initially raise the temperature of cement paste.
The nucleating agent of the double-fast sulphoaluminate cement comprises nano SiO2Rice husk ash, nano CaCO3One or more of nano clay, lithium nitrate, lithium carbonate and lithium chloride. The substances can quickly nucleate crystals in the sulphoaluminate cement hydration product, thereby not only improving the cement baseThe strength of the body can further increase the temperature of the slurry.
The accelerating agent of the double-quick sulphoaluminate cement comprises one or more of sodium sulfate, potassium sulfate, calcium chloride, magnesium chloride, sodium chloride, aluminum chloride, calcium nitrate, calcium nitrite and calcium formate.
The anti-freezing agent for liquefying ice of the double-fast sulphoaluminate cement comprises one or more of potassium formate, sodium formate, potassium acetate, sodium acetate, potassium phosphate and sodium phosphate.
The heating material of the double-fast sulphoaluminate cement is a material based on an alkaline battery, and comprises zinc powder, aluminum powder, iron powder, persulfate or percarbonate, manganese dioxide, carbon powder, a passivation agent, sodium silicate or sodium hydroxide or potassium hydroxide, polyethylene glycol and polyvinyl alcohol.
The heating material of the double-fast sulphoaluminate cement is a material based on thermite reaction, and comprises aluminum powder, ferric oxide powder, potassium permanganate or potassium hypochlorite or sodium percarbonate, polyethylene glycol and polyvinyl alcohol. The substances can provide a large amount of heat in the sulphoaluminate cement slurry, so that the temperature of the sulphoaluminate cement slurry is rapidly increased, and a temperature condition is provided for the hydration of cement.
The energy storage material of the double-fast sulphoaluminate cement comprises a carrier and a phase change material; the carrier comprises one or more of kaolin, illite, pyrophyllite, talc, bentonite, sepiolite, attapulgite, diatomaceous earth, zeolite and rectorite; the phase-change material comprises one or more of paraffin, ethylene butyl ester, polyethylene glycol, methyl octadecanoate, neopentyl glycol, pentaerythritol, tris (hydroxymethyl) aminomethane, polyethylene, polypropylene and epoxy resin. The material has the main function of storing heat generated by the heating material in a phase change mode, and releasing the heat when the temperature of the slurry is lower than a certain threshold value, so that the temperature is in a reasonable range.
The air entraining agent of the double-fast sulphoaluminate cement is one or more of rosin resins, dodecyl sulfonate, alkylbenzene sulfonate, fatty alcohol sulfonate, saponins and protein salt. The effect of the material can enable the cement-based material to generate a small amount of micro bubbles in the stirring process, thereby reducing the heat conductivity coefficient of the slurry and enabling the temperature of the cement slurry to stay at a certain level.
The thermal insulation material of the double-fast sulphoaluminate cement is one or more of expanded vermiculite, hollow glass beads, microporous calcium silicate and expanded perlite. The material not only can reduce the heat conductivity coefficient of the cement paste and reduce the heat loss speed, but also can be used as a filler to improve the mechanical property of the sulphoaluminate cement.
The fast hydrating mineral of the double fast sulphoaluminate cement is one or more of anhydrous calcium fluoroaluminate, calcium aluminate, calcium aluminoferrite and tricalcium aluminate. The material has the function of ensuring the hydration continuity of the sulphoaluminate cement, thereby ensuring that the temperature is continuously in a proper position, increasing the hydration degree of the cement and ensuring the early mechanical property of the cement.
The invention also provides a preparation method of the fast-curing sulphoaluminate cement, which is simple and convenient to prepare, and comprises the following steps:
adding sulphoaluminate cement clinker, limestone powder and anhydrous gypsum into a ball mill, and carrying out mixed grinding to obtain a main material;
the early strength agent, the nucleating agent, the accelerating agent, the antifreezing agent, the heating material, the energy storage material, the air entraining agent, the heat insulating material and the fast hydrated mineral are added into the main material and mixed by a powder mixer to obtain the double fast sulphoaluminate cement.
The invention also provides a using method of the fast hardening early strength sulphoaluminate cement, which can use water, snow or ice as mixing water and is convenient to use in a construction site, wherein water, crushed ice or snow which is 0.25-0.45 times of the mass of the fast hardening sulphoaluminate cement is added into the materials, and the materials are stirred for 60-360 seconds to be uniformly mixed to form fluid slurry, so that the fast hardening early strength sulphoaluminate cement for construction in a severe cold environment is obtained.
The invention has the beneficial effects that:
the quick hydration of the dual-quick sulphoaluminate cement in a severe cold environment is realized by adding the additives such as the early strength agent, the nucleating agent, the accelerating agent and the like; on the basis, a small amount of antifreeze is added to lower the freezing point of water to realize the liquidization of ice so as to ensure the water required by the subsequent hydration of cement; on the basis, heating materials, energy storage materials, air entraining agents and heat insulation materials are added to ensure the temperature required by the continuous hydration of the cement, and on the basis, a proper amount of fast hydration minerals are introduced to ensure the continuity of the hydration of the cement.
(1) The invention solves the problem that the sulphoaluminate cement can not be rapidly hardened and early strengthened in a severe cold environment, so that the sulphoaluminate cement can be used as a rush-repair and rush-construction material in the severe cold environment, and the application range of the sulphoaluminate cement is widened.
(2) Through tests, the compressive strength of the quick-hardening early-strength sulphoaluminate cement prepared by the invention can reach 10-20 MPa in a severe cold environment with the temperature lower than-20 ℃ for 2 hours, and the setting time is 14-29 min, so that the quick-hardening early-strength sulphoaluminate cement is a cementing material suitable for rush repair and rush construction in the severe cold environment.
Detailed Description
A double-quick sulphoaluminate cement for rush repair and rush construction in severe cold environment is prepared by adding various additives including early strength agent, nucleating agent, accelerating agent and the like into a main material as a cement initial hydration inducer; organic salt or inorganic salt is added as a snow melting and deicing component; heating materials, energy storage materials, air entraining agents and heat insulation materials are added as heat release and heat insulation components; adding fast hydration mineral as continuous hydrating agent.
The main material is prepared by taking sulphoaluminate cement clinker as a raw material, mixing and grinding appropriate amount of limestone and gypsum, and then adding a retarder for mixing and grinding. The aluminum oxide in the clinker is not less than 40 percent, and the content of silicon dioxide is not more than 10 percent. The initial setting time of the main material is not earlier than 35min, and the final setting time is not later than 100 min. Specifically, the main material ratio is as follows:
50-80 parts of sulphoaluminate cement clinker;
15-35 parts of limestone;
5-15 parts of anhydrous gypsum;
0-0.5 part of retarder.
On the basis of 100 parts of the total parts of the main materials, the following additive materials are added according to the mass multiple of the total parts of the main materials to obtain the dual-fast sulphoaluminate cement, and the dual-fast-setting rapid hardening or fast-setting rapid hardening of the dual-fast-setting fingers is realized.
0-0.06 time of the early strength agent;
0.003-0.015 time of nucleating agent;
0.01-0.05 time of accelerator;
1-6 times of an antifreezing agent;
4-15 times of heating materials;
3-8 times of energy storage material;
0.01-0.03 time of air entraining agent;
3-10 times of heat insulation material;
3-15 times of rapidly hydrated minerals.
The setting time of the dual-fast sulphoaluminate cement limited by the formula is 10-30 min, and the dual-fast sulphoaluminate cement can be prepared by adding water or only be in a dry powder material state.
The limestone contains calcium oxide not less than 50% and magnesium oxide less than 1.5%; the sulfur trioxide content in the anhydrous gypsum is not lower than 45 percent; the retarder is sodium gluconate, and the effective component is not less than 85%.
The early strength agent comprises sodium silicate, sodium aluminate, aluminum sulfate, aluminum potassium sulfate and the like, and the substances can react with minerals in the sulphoaluminate cement to promote hydration and initially raise the temperature of cement paste.
The nucleating agent comprises nano SiO2Rice husk ash, nano CaCO3One or more of nano clay, lithium nitrate, lithium carbonate and lithium chloride. The substances can quickly nucleate crystals in the sulphoaluminate cement hydration product, thereby not only improving the strength of a cement matrix, but also further improving the temperature of slurry. Nano SiO in nucleating agent2Rice hull ash and nanoclay and nano calcium carbonate are similar. The performance of each lithium salt is not obviously different and can be compared with that of nano SiO2Rice hull ash, nanoclay and nano calcium carbonateCan be used in combination.
The accelerator provided by the invention comprises one or more of sodium sulfate, potassium sulfate, calcium chloride, magnesium chloride, sodium chloride, aluminum chloride, calcium nitrate, calcium nitrite, calcium formate and the like. The effects of the accelerating agents are not obviously different.
The antifreeze for liquefying ice comprises one or more of potassium formate, sodium formate, potassium acetate, sodium acetate, potassium phosphate, sodium phosphate and the like. The antifreeze agents may be substituted for one another.
The heating material can be divided into two types according to functions, wherein the first type is a component taking an alkaline battery as a principle, and the second type is a component taking thermite reaction as a principle.
The first main component is zinc powder, aluminum powder, iron powder, persulfate or percarbonate, manganese dioxide, carbon powder, a passivation agent, sodium silicate or sodium hydroxide or potassium hydroxide, polyethylene glycol, polyvinyl alcohol and the like, and the passivation agent is sodium chloride; the zinc powder, the aluminum powder and the iron powder in the heating material can be mutually substituted; persulfate and percarbonate can be mutually substituted; sodium silicate, sodium hydroxide and potassium hydroxide can be mutually substituted; polyethylene glycol and polyvinyl alcohol may be substituted for each other.
The second type is mainly composed of aluminum powder, ferric oxide powder, potassium permanganate or potassium hypochlorite or sodium percarbonate, polyethylene glycol and polyvinyl alcohol. The substances can provide a large amount of heat in the sulphoaluminate cement slurry, so that the temperature of the sulphoaluminate cement slurry is rapidly increased, and a temperature condition is provided for the hydration of cement. Potassium permanganate, potassium hypochlorite and sodium percarbonate in the heating material can be mutually substituted; polyvinyl alcohol and polyethylene glycol may be substituted for each other.
The energy storage material is divided into a carrier and a phase change material according to functions, wherein the carrier comprises one or more of kaolin, illite, pyrophyllite, talc, bentonite, sepiolite, attapulgite, diatomite, zeolite, rectorite and the like, and the phase change material comprises one or more of paraffin, ethylene butyl ester, polyethylene glycol, methyl octadecanoate, neopentyl glycol, pentaerythritol, tris (hydroxymethyl) aminomethane, polyethylene, polypropylene, epoxy resin and the like. The material has the main function of storing heat generated by the heating material in a phase change mode, and releasing the heat when the temperature of the slurry is lower than a certain threshold value, so that the temperature is in a reasonable range. The individual support materials can be substituted for one another. The phase-change materials can be mutually substituted, and 1-3 types are selected for ensuring the effect.
The air entraining agent comprises one or more of rosin resins, dodecyl sulfonate, alkylbenzene sulfonate, fatty alcohol sulfonate, saponins, protein salt and the like. The effect of the material can enable the cement-based material to generate a small amount of micro bubbles in the stirring process, thereby reducing the heat conductivity coefficient of the slurry and enabling the temperature of the cement slurry to stay at a certain level. The air-entraining agents can be substituted for one another.
The heat insulation material comprises one or more of expanded vermiculite, hollow glass beads, microporous calcium silicate and expanded perlite. The material not only can reduce the heat conductivity coefficient of the cement paste and reduce the heat loss speed, but also can be used as a filler to improve the mechanical property of the sulphoaluminate cement. The thermal insulation materials can be replaced with each other.
The mineral rapidly hydrated is one or more of anhydrous calcium fluoroaluminate, calcium aluminate, calcium aluminoferrite, tricalcium aluminate and the like. The material has the function of ensuring the hydration continuity of the sulphoaluminate cement, thereby ensuring that the temperature is continuously in a proper position, increasing the hydration degree of the cement and ensuring the early mechanical property of the cement. Generally, 1-3 quick hydration materials are selected, and the hydration continuity can be ensured by controlling the mixing amount.
Furthermore, the invention provides a preparation method of sulphoaluminate cement for rush repair and rush construction projects in severe cold environments, which comprises the following steps:
firstly, obtaining main materials with the following mass fractions: 50-80 parts of sulphoaluminate cement clinker, 15-35 parts of limestone powder and 5-15 parts of anhydrous gypsum. Adding the sulphoaluminate cement clinker, limestone powder and anhydrous gypsum into a ball mill, wherein the revolution speed of the ball mill is 400-500 r/min and the revolution speed of the ball mill is 200r/min, and the mixing and grinding time is 10-20 min.
Secondly, adjusting the mass sum of the sulphoaluminate cement clinker, the limestone powder and the anhydrous gypsum to 100 parts, adding 0.1-0.5 part of retarder powder, and mixing for 30-60 min by using a powder mixer to obtain the main material.
Thirdly, adjusting the main material to 100 parts, weighing 0-0.06 time part of the early strength agent, 0.003-0.015 time part of the nucleating agent, 0.01-0.05 time part of the accelerating agent, 1-6 times part of the antifreezing agent, 4-15 times part of the heating material, 3-8 times part of the energy storage material, 0.01-0.03 time part of the air entraining agent, 3-10 times part of the heat insulation material and 3-15 times part of the fast hydration mineral for later use, adding the materials into the main material, and mixing the materials by using a powder mixer for 30-60 min to obtain the double fast sulphoaluminate cement used in the severe cold environment.
Adding snow or crushed ice into the double-quick sulphoaluminate cement according to the mass of 0.25-0.45 times of that of the double-quick sulphoaluminate cement in a severe cold environment, and stirring for 60-360 seconds to uniformly mix the double-quick sulphoaluminate cement; the mixture is stirred uniformly to form fluid slurry, so that the fast-hardening and fast-strengthening sulphoaluminate cement for construction in a severe cold environment is obtained.
When the method is implemented, special stirring equipment is not needed, the construction is convenient, a special maintenance process is not needed after the preparation and the molding, and tests show that the compressive strength of the obtained sulphoaluminate cement after construction for 2 hours can reach more than 10MPa in a severe cold environment with the temperature lower than-20 ℃, so that the requirement of emergency repair and rush construction engineering on the early strength development of the cementing material in the severe cold environment is met. The invention has simple preparation process and strong constructability, and is suitable for rapid rush repair and rush construction of engineering structures such as roads, highways, bridge floors, runways and the like in severe cold environments.
Example 1
The quick-hardening and quick-strength sulphoaluminate cement for the severe cold environment adopts the following main materials in parts by mass:
75 parts of sulphoaluminate cement clinker;
15 parts of limestone;
10 parts of anhydrous gypsum;
0.3 part of retarder.
On the basis of the main material, the following additive materials are added according to the mass multiple of the total parts of the main material, and the double-fast sulphoaluminate cement is obtained.
0.01 time of sodium silicate;
0.01 time of sodium aluminate;
0.01 time of aluminum sulfate;
nano SiO20.001 time of the weight portion;
0.004 times of nano calcium carbonate;
0.005 time of lithium nitrate;
0.01 time of sodium sulfate;
0.01 time of calcium chloride;
2-time parts of potassium formate;
1 time of potassium acetate;
4 times of aluminum powder;
3 times of ferric oxide powder;
1 time of potassium permanganate;
1.8 times of polyethylene;
0.2 time of polyethylene glycol;
2 times of kaolin;
1.6 times of paraffin;
0.8 time of polyethylene glycol;
0.6 time of polyethylene;
0.03 time of sodium dodecyl sulfate;
6 times of expanded vermiculite;
1 time of anhydrous calcium fluoroaluminate;
2 times of calcium aluminate;
tricalcium aluminate in 3 times weight portions.
When in use, the materials are mixed and stirred according to a proportion, and water, snow or ice is added at the same time, and the stirring time is 60-360 seconds; stirring to form fluid slurry, and obtaining the sulphoaluminate cement with quick hardening and quick strength in severe cold environment.
Example 2
The quick-hardening and quick-strength sulphoaluminate cement used in the severe cold environment adopts the following main materials in parts by mass:
55 parts of sulphoaluminate cement clinker;
35 parts of limestone;
10 parts of anhydrous gypsum.
On the basis of the main material, the following additive materials are added according to the mass multiple of the total parts of the main material, and the double-fast sulphoaluminate cement is obtained.
0.001 time of rice hull ash;
0.001 time of nano calcium carbonate;
0.002 times of nano clay;
0.001 time of lithium carbonate;
0.001 time of potassium sulfate;
0.02 time of magnesium chloride;
0.02 time of calcium nitrite;
2 times of sodium formate;
2 times of sodium acetate;
2-time parts of sodium phosphate;
5.5 times of zinc powder;
2 times of iron powder;
1.5 times of sodium percarbonate;
0.5 part of manganese dioxide;
0.1 time of passivation agent;
3.4 times of potassium hydroxide;
1.8 times of polyethylene;
0.2 time of polyvinyl alcohol;
1 time of bentonite;
1 time of zeolite;
2-time parts of neopentyl glycol;
2 times of epoxy resin;
2 times of methyl octadecanoate;
0.02 time of sodium fatty alcohol sulfonate;
5 times of expanded perlite;
5 times of hollow glass beads;
1 time of anhydrous calcium fluoroaluminate;
3 times of calcium aluminoferrite;
7 times of calcium aluminate.
The specific preparation procedure in this example was the same as in example 1.
Example 3
The quick-hardening early-strength sulphoaluminate cement for the severe cold environment adopts the following main materials in parts by mass:
70 parts of sulphoaluminate cement clinker;
20 parts of limestone;
10 parts of anhydrous gypsum;
0.1 part of retarder.
On the basis of the main material, the following additive materials are added according to the mass multiple of the total parts of the main material, and the double-fast sulphoaluminate cement is obtained.
0.01 time of sodium aluminate;
0.02 time of potassium aluminum sulfate;
0.005 time of rice hull ash;
nano SiO20.001 time of the weight portion;
0.004 time of lithium chloride;
0.01 time of potassium sulfate;
0.02 time of aluminum chloride;
3 times of potassium formate;
2 times of zinc powder;
1 time of aluminum powder;
0.5 part of manganese dioxide;
0.4 time of carbon powder;
0.1 time of passivation agent;
2 times of sodium silicate;
1.8 times of polyethylene;
0.2 time of polyethylene glycol;
2 times of sepiolite;
4 times of paraffin;
0.005 time of sodium dodecyl sulfate;
0.005 time of rosin resin;
5 times of expanded vermiculite;
5 times of microporous calcium silicate;
5 times of calcium aluminoferrite;
10 times of calcium aluminate.
The specific preparation procedure in this example was the same as in example 1.
For the sulphoaluminate cement of each example, referring to the cement mortar Strength test method (ISO method) (GB/T17671-1999), the physical and mechanical properties of the sulphoaluminate cement are prepared and tested in the environment of temperature-20 ℃, and the results are shown in the following Table 1:
TABLE 1 physical and mechanical properties of the sulfoaluminate cements in the examples
| Examples | 2h compressive strength/MPa | Coagulation time/min | Fluidity/mm |
| 1 | 14.4 | 19 | 200 |
| 2 | 12.7 | 27 | 260 |
| 3 | 17.5 | 14 | 160 |
According to the table 1, the 2h compressive strength of 3 groups of test pieces of the quick-hardening early-strength sulphoaluminate cement prepared by the invention used in the severe cold environment exceeds 10MPa, and the cement paste also has good fluidity and is suitable for being used as a quick repair project in the severe cold environment. The early compressive strength of the concrete in the embodiment 3 is the highest, but the setting time is short, so that the construction is not facilitated. Example 2 the setting time is appropriate, the construction is convenient, and the strength exceeds 10MPa, so the formula is selected in the construction example.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (17)
1. A fast-setting and fast-strengthening double-fast sulphoaluminate cement used in a severe cold environment is characterized in that a nucleating agent and a quick-setting agent are added into a main material to serve as a cement initial hydration inducer, an antifreezing agent is added to serve as a snow-melting and deicing component, a heating material, an energy storage material, an air entraining agent and a heat insulation material are added to serve as a heat release and heat insulation component, and fast hydration minerals are added to serve as continuous hydration agents; the main materials comprise sulphoaluminate cement clinker, limestone and anhydrous gypsum.
2. The dual fast sulphoaluminate cement of claim 1, wherein: the main material comprises, by mass, 50-80 parts of sulphoaluminate cement clinker, 15-35 parts of limestone and 5-15 parts of anhydrous gypsum.
3. The dual fast sulphoaluminate cement of claim 2, wherein: the main material also comprises a retarder, and the retarder is not higher than 0.5 part based on 100 parts of sulphoaluminate cement clinker, limestone and anhydrous gypsum.
4. A dual fast sulphoaluminate cement as claimed in claim 3 wherein: the content of calcium oxide in the limestone is not less than 50 percent, and the content of magnesium oxide in the limestone is less than 1.5 percent; the sulfur trioxide content in the anhydrous gypsum is not lower than 45%; the retarder is sodium gluconate.
5. The dual fast sulphoaluminate cement of claim 1, wherein: based on 100 parts by mass of the main material, the following additive materials are added according to the mass multiple of the main material:
0-0.06 time of the early strength agent;
0.003-0.015 time of nucleating agent;
0.01-0.05 time of accelerator;
1-6 times of an antifreezing agent;
4-15 times of heating materials;
3-8 times of energy storage material;
0.01-0.03 time of air entraining agent;
3-10 times of heat insulation material;
3-15 times of rapidly hydrated minerals.
6. The dual fast sulphoaluminate cement of claim 1, wherein: the early strength agent comprises sodium silicate, sodium aluminate, aluminum sulfate or aluminum potassium sulfate.
7. The dual fast sulphoaluminate cement of claim 1, wherein: the nucleating agent contains nano SiO2Rice husk ash, nano CaCO3One or more of nano clay, lithium nitrate, lithium carbonate and lithium chloride.
8. The dual fast sulphoaluminate cement of claim 1, wherein: the accelerator contains one or more of sodium sulfate, potassium sulfate, calcium chloride, magnesium chloride, sodium chloride, aluminum chloride, calcium nitrate, calcium nitrite and calcium formate.
9. The dual fast sulphoaluminate cement of claim 1, wherein: the antifreeze agent for liquefying the ice comprises one or more of potassium formate, sodium formate, potassium acetate, sodium acetate, potassium phosphate and sodium phosphate.
10. The dual fast sulphoaluminate cement of claim 1, wherein: the heating material is a material based on the principle of an alkaline battery and comprises zinc powder, aluminum powder, iron powder, persulfate or percarbonate, manganese dioxide, carbon powder, a passivation agent, sodium silicate or sodium hydroxide or potassium hydroxide, polyethylene glycol and polyvinyl alcohol.
11. The dual fast sulphoaluminate cement of claim 1, wherein: the heating material is a material based on thermite reaction and comprises aluminum powder, iron oxide powder, potassium permanganate or potassium hypochlorite or sodium percarbonate, polyethylene glycol and polyvinyl alcohol.
12. The dual fast sulphoaluminate cement of claim 1, wherein: the energy storage material comprises a carrier and a phase change material; the carrier comprises one or more of kaolin, illite, pyrophyllite, talc, bentonite, sepiolite, attapulgite, diatomaceous earth, zeolite and rectorite; the phase-change material comprises one or more of paraffin, ethylene butyl ester, polyethylene glycol, methyl octadecanoate, neopentyl glycol, pentaerythritol, tris (hydroxymethyl) aminomethane, polyethylene, polypropylene and epoxy resin.
13. The dual fast sulphoaluminate cement of claim 1, wherein: the air entraining agent is one or more of rosin resin, dodecyl sulfonate, alkylbenzene sulfonate, fatty alcohol sulfonate, saponins and protein salt.
14. The dual fast sulphoaluminate cement of claim 1, wherein: the heat insulating material is one or more of expanded vermiculite, hollow glass beads, microporous calcium silicate and expanded perlite.
15. The dual fast sulphoaluminate cement of claim 1, wherein: the rapidly hydrated mineral is one or more of anhydrous calcium fluoroaluminate, calcium aluminate, calcium aluminoferrite and tricalcium aluminate.
16. The process for the preparation of a dual fast sulphoaluminate cement according to claim 1, wherein: comprises the following steps:
adding sulphoaluminate cement clinker, limestone powder and anhydrous gypsum into a ball mill, and carrying out mixed grinding to obtain a main material;
the early strength agent, the nucleating agent, the accelerating agent, the antifreezing agent, the heating material, the energy storage material, the air entraining agent, the heat insulating material and the fast hydrated mineral are added into the main material and mixed by a powder mixer to obtain the double fast sulphoaluminate cement.
17. The method for using the dual fast sulphoaluminate cement of claim 1, wherein the method comprises the following steps: adding water, snow or crushed ice into the double-quick sulphoaluminate cement according to the mass which is 0.25-0.45 times of the mass of the double-quick sulphoaluminate cement, and stirring for 60-360 seconds to uniformly mix the water, the snow or the crushed ice to form fluid slurry, thereby obtaining the quick-hardening early-strength sulphoaluminate cement for construction in a severe cold environment.
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