CN109608148B - Rigid-elastic nano powder synergistic reinforced and toughened grouting material and preparation method and application thereof - Google Patents
Rigid-elastic nano powder synergistic reinforced and toughened grouting material and preparation method and application thereof Download PDFInfo
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- CN109608148B CN109608148B CN201910005694.0A CN201910005694A CN109608148B CN 109608148 B CN109608148 B CN 109608148B CN 201910005694 A CN201910005694 A CN 201910005694A CN 109608148 B CN109608148 B CN 109608148B
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Classifications
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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
- C04B28/14—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 containing calcium sulfate cements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0203—Arrangements for filling cracks or cavities in building constructions
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00008—Obtaining or using nanotechnology related materials
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
-
- 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 provides a rigid-elastic nano powder synergistic reinforced and toughened grouting material and a preparation method and application thereof, and relates to the technical field of building grouting materials. The rigid-elastic nano powder synergistic reinforced toughened grouting material comprises the following raw materials in parts by weight: 70.5-88.5 parts of cementing material, 55-74 parts of quartz sand, 0.08-0.12 part of light calcium carbonate, 0.06-0.12 part of nano calcium carbonate, 0.05-0.1 part of nano powder rubber and 0.4-0.9 part of auxiliary agent. The preparation method of the grouting material comprises the following steps: preparing modified nano powder rubber, preparing grouting material dry powder, preparing grouting material and the like. The rigid-elastic nano powder synergistic reinforced toughened grouting material changes the interface structure and the hardened matrix structure of the grouting material, has excellent construction performance, compressive strength, crack resistance and corrosion resistance, and can adapt to more severe environments and complex working conditions.
Description
Technical Field
The invention relates to the technical field of building grouting materials, in particular to a rigid-elastic nano powder synergistic reinforced and toughened grouting material and a preparation method and application thereof.
Background
Grouting materials were first developed in the second war due to military needs, and by the 50 s of the 20 th century, began to be used in mechanical equipment installations in the industrial sector. The grouting materials are the clay and lime at first, and gradually develop into cement grouting materials and chemical grouting materials, and the most applied grouting materials at present are cement grouting materials. The cement-based grouting material is prepared by taking a high-strength material as an aggregate, taking cement as an additive or an auxiliary agent and assisting materials such as high flow state, micro-expansion, release segregation and the like, and can be used after being uniformly stirred by adding water in a construction site. Compared with chemical grouting materials, the grouting material has the advantages of small toxic and side effects and small pollution.
At present, the cement-based grouting material has the disadvantages of low flexural strength, poor toughness, poor erosion resistance and difficulty in adapting to severe environments.
Disclosure of Invention
Based on this, it is necessary to provide a rigid-elastic nano powder synergistic reinforced and toughened grouting material, and a preparation method and application thereof, aiming at the technical problems of low breaking strength, poor toughness and poor erosion resistance of the existing cement-based grouting material.
The rigid-elastic nano powder synergistic reinforced and toughened grouting material comprises the following raw materials in parts by weight:
the rigid-elastic nano powder synergistic reinforced and toughened grouting material takes nano calcium carbonate and nano powder rubber with the particle size of less than 0.1 mu m as rigid particles and elastic particles for reinforcement and toughening respectively, changes the interface structure of the grouting material and the hardened matrix structure, ensures that the hardened grouting material has excellent construction performance, compressive strength, crack resistance and corrosion resistance, can adapt to more severe environment and complex working condition, and even can adapt to the seabed environment.
In one embodiment, the cementitious material is comprised of the following raw materials:
in one embodiment, the quartz sand comprises the following raw materials in parts by weight:
the quartz sand with particle grading is matched with a matrix consisting of a cementing material to form a structure with specific particle size accumulation, the product has good rheological property and good particle dispersibility, the generation rate of bubbles is low when the quartz sand is used, and the internal structure is compact after hardening.
In one embodiment, the auxiliary agent is composed of the following raw materials in parts by weight:
0.00025 to 0.0008 part of silane coupling agent,
0.1 to 0.3 part of hydroxypropyl methyl cellulose,
0.3-0.5 part of water reducing agent.
In one embodiment, the portland cement is 52.5 and/or 52.5R.
In one embodiment, the calcium sulfate content of the gypsum powder is more than or equal to 90 percent, and the particle size of the gypsum powder is less than 44 mu m.
In one embodiment, the SiO in the silica micropowder2The content is more than or equal to 94 percent, and the median diameter d500.3 to 0.6 μm.
In one embodiment, the slag powder is S95 and/or S105, and the specific surface area is 2100-2500 m2/kg。
In one embodiment, the viscosity of the hydroxypropyl methylcellulose is 3500 to 4000mPa · s.
In one embodiment, the water reducing agent is a polycarboxylate water reducing agent, and the water reducing efficiency is 28-30%.
In one embodiment, the purity of the light calcium carbonate is more than 99%, and the particle size of the light calcium carbonate is 10-15 μm.
In one embodiment, the coupling agent is KH 560.
In one embodiment, the SiO in the quartz sand2The content of the active component is more than or equal to 99.5 percent.
In one embodiment, the nano calcium carbonate has a purity of greater than 99%.
In one embodiment, the nano powder rubber is nano cyanogen butadiene rubber, and the particle size is 40-60 nm.
The invention also comprises a preparation method of the rigid-elastic nano powder synergistic reinforced and toughened grouting material, which comprises the following steps:
step 1, preparing modified nano powder rubber: mixing a silane coupling agent with water to dissolve the silane coupling agent, adding the nano-powder rubber, and uniformly mixing to obtain modified nano-powder rubber;
step 2, preparing grouting material dry powder: uniformly mixing quartz sand, adding a cementing material, light calcium carbonate and other auxiliaries, continuously uniformly mixing, then adding nano calcium carbonate and the modified nano powder rubber obtained in the step 1, and mixing to obtain grouting material dry powder;
step 3, preparing grouting material: and (3) adding water into the grouting material dry powder obtained in the step (2), wherein the water-to-glue ratio is 0.3-0.5, and uniformly mixing to obtain the rigid-elastic nano powder synergistic reinforced and toughened grouting material. The water-glue ratio is as follows: the ratio of the water addition amount to the amount of the cementing material.
According to the preparation method, the nano powder rubber is modified by using the coupling agent, and the modified nano powder rubber improves the dispersity of the modified nano powder rubber in an inorganic material system, improves the firmness between the modified nano powder rubber and an inorganic material, and can enhance the toughening effect; the nano calcium carbonate and the modified nano powder rubber are respectively used as rigid and elastic particles for reinforcing and toughening, so that the interface structure and the hardened matrix structure of the grouting material are changed, and the hardened grouting material has excellent construction performance, compressive strength, crack resistance and corrosion resistance, can adapt to worse environment and complex working condition, and even can adapt to seabed environment.
In one embodiment, in step 1: the temperature of the water is 75-80 ℃; adding the nano-powder rubber into a silane coupling agent solution, uniformly mixing, and then carrying out microwave drying for 3-5 min, wherein the microwave frequency is 5000-6000 MHz, and the microwave drying temperature is 30-40 ℃; the solid content of the obtained modified nano-powder rubber is 15-20%;
in the step 2: the quartz sand is mixed and stirred for 2-3 min, the mixing and stirring time after the cementing material, the light calcium carbonate and other auxiliaries are added is 2-5 min, the mixing and stirring time after the nano calcium carbonate and the modified nano powder rubber are added is 2-5 min, and the stirring speed is 300-1000 r/min;
in the step 3, the grouting material and water are mixed in an ultrasonic stirring pot, the stirring speed is 1000-1200 r/min, the stirring time is 3-5 min, and the obtained rigid-elastic nano powder synergistically enhanced and toughened grouting material is obtained.
The invention also comprises the application of the rigid-elastic nano powder synergistic reinforced and toughened grouting material in the reinforcement and the reinforcement of the building structure.
According to the rigid-elastic nano powder synergistic reinforced and toughened grouting material, the nano calcium carbonate and the modified nano powder rubber are respectively used as rigid particles and elastic particles for reinforcement and toughening, so that the interface structure and the hardened matrix structure of the grouting material are changed, the hardened grouting material has excellent construction performance, compressive strength, crack resistance and corrosion resistance, and can adapt to more severe environments and complex working conditions, even adapt to submarine environments.
Compared with the prior art, the invention has the following beneficial effects:
the rigid-elastic nano powder synergistic reinforced and toughened grouting material provided by the invention has the advantages that the nano calcium carbonate and the modified nano powder rubber are respectively used as rigid particles and elastic particles for reinforcement and toughening, the interface structure of the grouting material and the hardened matrix structure are changed, and the hardened grouting material has excellent construction performance, compressive strength, crack resistance and corrosion resistance, can adapt to more severe environment and complex working conditions, and even can adapt to the seabed environment.
And secondly, the nano calcium carbonate and the light calcium carbonate are used in a matching manner to serve as an early strength agent, so that the development of later strength is promoted while the improvement of the early strength of the grouting material is promoted.
And thirdly, the modified nano powder rubber improves the dispersity of the rubber in an inorganic material system, improves the firmness degree between the rubber and the inorganic material, and can enhance the toughening effect.
And fourthly, the quartz sand with particle grading is matched with the matrix consisting of the cementing material to form a structure with specific particle size accumulation, so that the product has good rheological property and good particle dispersibility, the bubble generation rate is low during use, and the hardened internal structure is compact.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the preferred embodiments. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Example 1
A rigid-elastic nano powder synergistic reinforced and toughened grouting material is prepared by the following method:
step 1, preparing modified nano powder rubber: adding 0.0005 part of silane coupling agent (KH560) into 80 ℃ water to dissolve the silane coupling agent, then adding 0.1 part of nano-powder rubber, wherein the nano-powder rubber is nano-butyl cyanide rubber, the particle size is 60nm, uniformly stirring, and then performing microwave drying for 4min, the microwave frequency is 5000MHz, and the microwave drying temperature is 35 ℃ to obtain modified nano-butyl cyanide rubber;
step 2, preparing grouting material dry powder: mixing and stirring 10 parts of quartz sand of 1180-600 microns, 10 parts of quartz sand of 600-300 microns, 22 parts of quartz sand of 300-150 microns, 16 parts of quartz sand of 150-44 microns and 6 parts of quartz sand below 44 microns for 3min, then adding 55 parts of portland cement, 8 parts of gypsum powder, 4 parts of silica powder, 12 parts of slag powder, 0.2 part of hydroxypropyl methyl cellulose, 0.4 part of a water reducing agent and 0.1 part of light calcium carbonate, mixing and stirring for 3min, adding 0.1 part of nano calcium carbonate and the modified nano cyanogen butadiene rubber obtained in the step 1, mixing and stirring for 3min at the stirring speed of 600r/min to obtain dry grouting material powder;
step 3, preparing grouting material: and (3) adding water into the grouting material dry powder obtained in the step (2), wherein the water-to-glue ratio is 0.4, stirring and mixing uniformly, and stirring at the rotating speed of 1100r/min for 4min to obtain the grouting material.
Example 2
A rigid-elastic nano powder synergistic reinforced and toughened grouting material is prepared by the following method:
step 1, preparing modified nano powder rubber: adding 0.00025 part of silane coupling agent (KH560) into 80 ℃ water to dissolve the silane coupling agent, then adding 0.1 part of nano-powder rubber, wherein the nano-powder rubber is nano-butyl cyanide rubber, the particle size is 60nm, uniformly stirring, and then performing microwave drying for 3min, the microwave frequency is 6000MHz, and the microwave drying temperature is 30 ℃ to obtain modified nano-butyl cyanide rubber;
step 2, preparing grouting material dry powder: 9 parts of quartz sand of 1180-600 microns, 12 parts of quartz sand of 600-300 microns, 20 parts of quartz sand of 300-150 microns, 18 parts of quartz sand of 150-44 microns and 4 parts of quartz sand below 44 microns are mixed and stirred for 3min, then 50 parts of Portland cement, 8.5 parts of gypsum powder, 3 parts of silica powder, 15 parts of slag powder, 0.1 part of hydroxypropyl methyl cellulose, 0.5 part of water reducing agent and 0.08 part of light calcium carbonate are added, mixed and stirred for 3min, 0.06 part of nano calcium carbonate and the modified nano cyanogen butadiene rubber obtained in the step 1 are added, then the mixing and stirring time is 3min, and the stirring speed is 600r/min, so that dry grouting material powder is obtained;
step 3, preparing grouting material: and (3) adding water into the grouting material dry powder obtained in the step (2), wherein the water-to-glue ratio is 0.3, stirring and mixing uniformly, and stirring at the rotating speed of 1000r/min for 5min to obtain the grouting material.
Example 3
A rigid-elastic nano powder synergistic reinforced and toughened grouting material is prepared by the following method:
step 1, preparing modified nano powder rubber: adding 0.0008 part of silane coupling agent (KH560) into water at 80 ℃ for dissolving, then adding 0.05 part of nano-powder rubber, wherein the nano-powder rubber is nano-butyl cyanide rubber, the particle size is 60nm, uniformly stirring, and then carrying out microwave drying for 3min, wherein the microwave frequency is 5500MHz, and the microwave drying temperature is 40 ℃ to obtain the modified nano-butyl cyanide rubber;
step 2, preparing grouting material dry powder: mixing and stirring 11 parts of quartz sand of 1180-600 microns, 8 parts of quartz sand of 600-300 microns, 25 parts of quartz sand of 300-150 microns, 14 parts of quartz sand of 150-44 microns and 8 parts of quartz sand below 44 microns for 2min, then adding 60 parts of portland cement, 7.5 parts of gypsum powder, 5 parts of silica powder, 10 parts of slag powder, 0.3 part of hydroxypropyl methyl cellulose, 0.3 part of water reducing agent and 0.12 part of light calcium carbonate, mixing and stirring for 5min, adding 0.12 part of nano calcium carbonate and the modified nano cyanogen butadiene rubber obtained in the step 1, mixing and stirring for 2min, wherein the stirring speed is 1000r/min, and obtaining dry grouting material powder;
step 3, preparing grouting material: and (3) adding water into the grouting material dry powder obtained in the step (2), wherein the water-to-glue ratio is 0.5, stirring and mixing uniformly, and stirring at the rotating speed of 1200r/min for 3min to obtain the grouting material.
Example 4
The grouting material is basically the same as the preparation method of the embodiment 1 in the aspects of rigidity and elasticity, and is characterized by comprising 9 parts of quartz sand of 1180-600 microns, 8 parts of quartz sand of 600-300 microns, 20 parts of quartz sand of 300-150 microns, 14 parts of quartz sand of 150-44 microns and 4 parts of quartz sand below 44 microns.
Example 5
The grouting material is basically the same as the preparation method of the embodiment 1, and is different from the preparation method in that 66 parts of quartz sand with the particle size of 300-150 mu m is replaced by the quartz sand.
For comparison with the above examples, the following comparative examples were set.
Comparative example 1
A grouting material, which is basically the same as the preparation method of the embodiment 1, is different in that the particle size of the nano-butyl cyanide rubber is 200 nm.
And (3) performing performance tests on the grouting materials obtained in the embodiment and the comparative example, wherein the performance tests comprise parameters such as fluidity, compressive strength, flexural strength, vertical expansion rate, bleeding rate and the like.
Examples of the experiments
The method for testing each performance parameter is as follows:
(1) the tests of fluidity, strength and vertical expansion rate should be carried out by adopting the annex relevant regulations of JG/T408;
(2) the bleeding rate test was carried out in accordance with GB/T50080.
The test results are shown in the following table:
TABLE 1 grouting material Performance test results
From the test results, the nano calcium carbonate and the modified nano powder rubber selected in the invention are respectively used as rigid and elastic particles for reinforcement and toughening, so that the hardened grouting material has better construction performance, compressive strength, crack resistance and corrosion resistance. The product performance obtained by adopting the quartz sand with the particle grading is better than that obtained by adopting the quartz sand without the particle grading.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. The rigid-elastic nano powder synergistic reinforced and toughened grouting material is characterized by comprising the following raw materials in parts by weight:
the nano powder rubber is nano cyanogen butadiene rubber, and the particle size is 40-60 nm;
the cementing material consists of the following raw materials:
the quartz sand is prepared from the following raw materials in parts by weight:
the auxiliary agent comprises the following raw materials in parts by weight:
0.00025 to 0.0008 part of silane coupling agent,
0.1 to 0.3 part of hydroxypropyl methyl cellulose,
0.3-0.5 part of water reducing agent.
2. The rigid-elastic nano powder synergistic reinforced and toughened grouting material as claimed in claim 1, wherein the portland cement is 52.5 and/or 52.5R; the calcium sulfate content of the gypsum powder is more than or equal to 90 percent, and the particle size of the gypsum powder is less than 44 mu m; SiO in the silicon micropowder2The content is more than or equal to 94 percent, and the median diameter d500.3 to 0.6 μm; the slag powder is S95 and/or S105, and the specific surface area of the slag powder is 2100-2500 m2/kg。
3. The rigid-elastic nano powder synergistic reinforced and toughened grouting material as claimed in claim 1, wherein the viscosity of the hydroxypropyl methyl cellulose is 3500-4000 mPa-s; the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing efficiency is 28-30%; the purity of the light calcium carbonate is more than 99%, and the particle size of the light calcium carbonate is 10-15 mu m; the coupling agent is KH 560.
4. The rigid-elastic nano powder synergistic reinforced and toughened grouting material as claimed in any one of claims 1 to 3, characterized in that the rigid-elastic nano powder is used for reinforcing and toughening the grouting materialSiO in quartz sand2The content of the (D) is more than or equal to 99.5 percent; the purity of the nano calcium carbonate is more than 99 percent.
5. The preparation method of the rigid-elastic nano powder synergistic reinforced and toughened grouting material as claimed in claim 4, characterized by comprising the following steps:
step 1, preparing modified nano powder rubber: mixing a silane coupling agent with water to dissolve the silane coupling agent, then adding the nano-powder rubber, and uniformly mixing to obtain modified nano-powder rubber;
step 2, preparing grouting material dry powder: uniformly mixing quartz sand, adding a cementing material, light calcium carbonate and other auxiliaries, uniformly mixing, adding nano calcium carbonate and the modified nano powder rubber obtained in the step 1, and mixing to obtain grouting material dry powder;
step 3, preparing grouting material: and (3) adding water into the grouting material dry powder obtained in the step (2), wherein the water-to-glue ratio is 0.3-0.5, and uniformly mixing to obtain the rigid-elastic nano powder synergistic reinforced and toughened grouting material.
6. The method for preparing the rigid-elastic nano powder synergistic reinforced and toughened grouting material as claimed in claim 5, wherein,
in the step 1: the temperature of the water is 75-80 ℃; adding the nano-powder rubber into a silane coupling agent solution, uniformly mixing, and then carrying out microwave drying for 3-5 min, wherein the microwave frequency is 5000-6000 MHz, and the microwave drying temperature is 30-40 ℃; the solid content of the obtained modified nano-powder rubber is 15-20%;
in the step 2: the quartz sand is mixed and stirred for 2-3 min, the mixing and stirring time after the cementing material, the light calcium carbonate and other auxiliaries are added is 2-5 min, the mixing and stirring time after the nano calcium carbonate and the modified nano powder rubber are added is 2-5 min, and the stirring speed is 300-1000 r/min;
in the step 3, the grouting material and water are mixed in an ultrasonic stirring pot, the stirring speed is 1000-1200 r/min, the stirring time is 3-5 min, and the obtained rigid-elastic nano powder synergistically enhanced and toughened grouting material is obtained.
7. The use of the rigid-elastic nano powder synergistic reinforced and toughened grouting material as claimed in any one of claims 1 to 4 in the reinforcement and strengthening of building structures.
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| US7910162B2 (en) * | 2008-08-14 | 2011-03-22 | Bryan Cogan | Grout for laying paver stones and method of use |
| CN104003681A (en) * | 2014-06-03 | 2014-08-27 | 中交上海三航科学研究院有限公司 | Offshore wind power duct rack grouting material and construction method thereof |
| CN105060803A (en) * | 2015-07-27 | 2015-11-18 | 福州爱因新材料有限公司 | Cement-based binder having functions of moisture resistance and thermal insulation |
| CN105367026A (en) * | 2015-12-10 | 2016-03-02 | 张进 | High strength concrete and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7910162B2 (en) * | 2008-08-14 | 2011-03-22 | Bryan Cogan | Grout for laying paver stones and method of use |
| CN104003681A (en) * | 2014-06-03 | 2014-08-27 | 中交上海三航科学研究院有限公司 | Offshore wind power duct rack grouting material and construction method thereof |
| CN105060803A (en) * | 2015-07-27 | 2015-11-18 | 福州爱因新材料有限公司 | Cement-based binder having functions of moisture resistance and thermal insulation |
| CN105367026A (en) * | 2015-12-10 | 2016-03-02 | 张进 | High strength concrete and preparation method thereof |
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