CN107746219A - Explosion-proof high temperature resistance concrete and preparation method thereof - Google Patents
Explosion-proof high temperature resistance concrete and preparation method thereof Download PDFInfo
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- CN107746219A CN107746219A CN201710851325.4A CN201710851325A CN107746219A CN 107746219 A CN107746219 A CN 107746219A CN 201710851325 A CN201710851325 A CN 201710851325A CN 107746219 A CN107746219 A CN 107746219A
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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
- C04B28/02—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 hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- 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
-
- 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
- C04B28/02—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 hydraulic cements other than calcium sulfates
- C04B28/021—Ash cements, e.g. fly ash cements ; Cements based on incineration residues, e.g. alkali-activated slags from waste incineration ; Kiln dust cements
-
- 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
- C04B28/02—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 hydraulic cements other than calcium sulfates
- C04B28/08—Slag cements
- C04B28/082—Steelmaking slags; Converter slags
-
- 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
- C04B2111/20—Resistance against chemical, physical or biological attack
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a kind of explosion-proof high temperature resistance concrete, the raw material of the concrete is respectively by mass percentage：Cement 21 57%, aggregate 25 65%, mixing material 2 28%, high tensile strength fiber 0.2 20%, organic fiber 0.05 1.1%, the water reducer 0.04 1.2% in terms of solid content, defoamer 0.004 1.2% and water 3 14.3%.The concrete of the present invention not only has the performances such as preferable explosion-proof, shock resistance, high temperature resistance, but also with performances such as higher resistance to compression, bending resistance, rupture strengths, industry and civilian installation can be widely used in as protective materials.
Description
Technical field
The present invention relates to concrete, especially a kind of industrial and civilian explosion-proof high temperature resistance concrete, the present invention also relates to
And the preparation method of the concrete.
Background technology
Since the eighties in last century, the violence attack of terrorism occurs repeatedly, embassy, airport, parking lot, stadium
Shop, dam etc. all turn into the target of explosive attack.According to statistics, the terrorist bombings that the U.S. occurred from 1980 to 1999 attack thing
In part, the target of 96% explosive incident is all civilian installation.In addition, industry and civilian installation be also faced with it is inflammable and explosive
The harm such as blast caused by solid, liquid, gas body etc..Meanwhile the fire triggered with blast, and modernization large-scale and close
Industry and the building fire of civilian installation of collectionization, collapse because of explosive spalling, cause personnel and economic massive losses
Report is also of common occurrence.At present, high-strength, super high strength concrete building is swift and violent to emerge, but studies that to find that it occurs at high temperature quick-fried
The probability split is far above regular tenacity concrete.
The Patents of existing explosion-proof concrete or high temperature resistance explosion concrete, but on have both performances concurrently and
The research of the industrial environment-friendly type concrete protective materials of disaster such as defence blast, fire with civilian aspect has not been reported.In view of
China's industry at present faces the disasters such as blast, fire with civilian installation, and concrete enbrittle in itself greatly, impact resistance
Difference, the defects of bending strength is low, fire resistance is poor, so needing badly while there is explosion-proof to impact and the high strength industrial of high temperature resistance and the people
With concrete protection material.
The content of the invention
In order to solve the above problems, the invention provides a kind of explosion-proof high temperature resistance concrete, the raw material of the concrete is pressed
Mass percent is respectively：Cement 21-57%, aggregate 25-65%, mixing material 2-28%, high tensile strength fiber 0.2-20%,
Organic fiber 0.05-1.1%, the water reducer 0.04-1.2% in terms of solid content, defoamer 0.004-1.2% and water 3-
14.3%.
In one embodiment, in mass, cement clinker content is 80%-97% in the cement, and cement is ripe
C in material3S contents are 45%-75%.The cement is selected from portland cement, Portland cement, sulfate cement, blast furnace
Cement and pulverized fuel ash cement and combinations thereof.
In one embodiment, the particle diameter of the aggregate is less than 4.75mm, and fine aggregate of the particle diameter less than 0.15mm accounts for bone
Expect the 15-85% of gross mass.The aggregate is selected from river sand, silica sand, quartz sand, limestone sand, silicon carbide sand, sintered bauxite sand
With diamond dust and combinations thereof.
In one embodiment, the mixing material is made up of following component：Active SiO2Mass percent is 40-
96%, CaO mass percent are 0.3-24%, SO3Mass percent is 0.1-34%.The mixing material particle diameter is the cement
Average grain diameter less than 1/10, the quality of the mixing material for the quality of the cement 5-35%.
In one embodiment, the tensile strength of the high tensile strength fiber is not less than 380Mpa, density 1-
10g/cm3, a diameter of 0.08-1.2mm, length 3-60mm, draw ratio 30-250.The high tensile strength fiber is selected from steel
Fiber and carbon fibre and combinations thereof, the volume volume of the high tensile strength fiber are the 0.3-8.0% of volume of concrete.
In preferred embodiment, a diameter of 0.10-0.75mm of the high tensile strength fiber, length 10-40mm, draw ratio is
60-100。
In one embodiment, the fusing point of the organic fiber is 100-400 DEG C, length 3-60mm, and draw ratio is
200-900；The volume volume of the organic fiber is the 0.2-3% of volume of concrete.In preferred embodiments, it is described to have
The length of machine fiber is 10-30mm.
In one embodiment, the water reducer is the polycarboxylate water-reducer or naphthalene system diminishing that water-reducing rate is not less than 14%
Agent.0.1- of the quality for the water reducer counted using solid content as binder materials (summation of cement and mixing material) gross mass
2.0%.In a preferred embodiment, the quality of the water reducer is the 0.4-1.2% of binder materials gross mass.
Present invention also offers the method for the explosion-proof high temperature resistance concrete for preparing the present invention, comprise the following steps：
1) after weighing each raw material, cement, mixing material and aggregate are added into forced mixer stirring；Then by water, diminishing
Agent and defoamer add, and continue stirring to there is notable fluidity；Then high tensile strength fiber and organic fiber are added, stirring is equal
It is even；And
2) the slurry vibration moulding in a mold for allowing step 1) to be formed, normal temperature stand first de- after supporting 24 hours or 48 hours
Mould, then enter maintenance or natural curing in water-filling, obtain concrete prefabricated product；Or the slurry scene for allowing step 1) to be formed is poured
Construction is built, pours rear covering curing 24 hours or 48 hours, then water drenching or the wet gunnysack maintenance of covering.
The concrete of the present invention not only has the performances such as preferable explosion-proof, shock resistance, high temperature resistance, but also with higher
Resistance to compression, bending resistance, the performance such as rupture strength, industry and civilian installation can be widely used in as protective materials.It is meanwhile this civilian
Concrete protection material filled mixing material, there is no new pollution to produce in preparation process, meet environmental protection concept, have good
Ecological benefits.In addition, the preparation method of concrete simple possible of the present invention.
Embodiment
In order to which technical characteristic, purpose and the beneficial effect of the present invention is more clearly understood, now to the skill of the present invention
Art scheme is further described.
The raw material of concrete of the present invention includes cement, aggregate, mixing material, high tensile strength fiber, organic fiber, diminishing
Agent, defoamer, Yi Jishui.
The admixture of high fluidity water reducer and mixing material, be advantageous to the self compacting ability of concrete；The organic fiber of admixture can
Melt at high temperature, melt the tubular conduit of formation and hydrated product dehydration, decompose increased pore and communicate, increase water
The passage of steam, improve concrete elevated temperature property；The effect of contraction that is extended to inside concrete crack of admixture high-tensile with
And preferable cementation between steel fibre and Behavior of Hardened Cement Paste, the destruction that can efficiently reduce or prevent to explode to concrete are made
With.
The present invention is described in further details with reference to specific embodiment.
Embodiment 1：
The explosion-proof high temperature resistance concrete of the present embodiment, is uniformly combined by various ingredients.Each component presses quality percentage
Than being respectively：37.1% portland cement (Ji east shield stone 52.5R cement, specific surface area 450m2/ kg, apparent density 3.14g/
cm3), aggregate includes river sand and silica sand, wherein 10.4% quartziferous river sand (density 2.71g/cm3, modulus of fineness 2.4),
(particle diameter is below 0.5mm, density 2.65g/cm to 28.3% silica sand3), 9.4% mixing material (SiO2Mass ratio accounts for 68%, CaO
Account for 12%, SO3Account for 17%), 8.3% water, powder is glue in water reducer (high performance water reducing agent of polyocarboxy acid, solid content 24%)
The 0.7% of gel material gross mass, steel fibre (density 7.80g/cm3, diameter 0.22mm, length 15mm, tensile strength 2850MPa)
Volume volume is 2%, organic fiber (polypropylene fibre (PP fibers), 173 DEG C, length 15.0mm, density 0.91g/cm of fusing point3)
Volume volume is 0.2%, and organic silicon defoamer volume is the 0.14% of binder materials gross mass.The original of the concrete protection material
Proportioning is as shown in table 1 by mass percentage for material.
The raw materials used mass percent proportioning of the concrete of table 1
On the basis of precise raw material, first aggregate, binder materials are added to forced mixer and stirred, then
Water, defoamer and water reducer are added, continue stirring to there is notable fluidity, is eventually adding steel fibre and PP fibers, stirring is equal
It is even.The slurry vibration moulding that will be stirred, prefabrication are stripped after normal temperature stands just foster (24 hours), and (20 ± 2) DEG C are relatively wet
In the standard curing room water of degree more than 95% maintenance obtains industrial or civilian concrete protection material to regulation age.Herein
" notable fluidity " used, which refers to concrete, can reach the requirement of self-leveling concrete, i.e. the slump is higher than more than 250mm.
Embodiment 2：
The explosion-proof high temperature resistance concrete of the present embodiment, is uniformly combined by various ingredients.Each component presses quality percentage
Than being respectively：57% Portland cement (42.5 cement, specific surface area 430m2/ kg, apparent density 3.12g/cm3),
(particle diameter accounts for 40% to 26.8% silica sand aggregate less than 0.15mm, density 2.87g/cm3), 4.1% mixing material (SiO2Mass ratio
Account for 40%, CaO and account for 24%, SO3Account for 34%), 10.9% water, water reducer (high performance water reducing agent of polyocarboxy acid powder) accounts for gelling material
Expect the 2% of gross mass, (tensile strength reaches 5000MPA, length 20mm, diameter 0.15mm, density 1.8g/cm to carbon fibre3) body
Product volume is 1.0%, organic fiber (polypropylene fibre, 165 DEG C, length 20.0mm, density 0.90g/cm of fusing point3) volume volume
For 0.3%, organic silicon defoamer volume is the 0.25% of binder materials gross mass.The raw material of the concrete protection material presses quality
Percentage proportioning is as shown in table 2.
The raw materials used mass percent proportioning of the concrete of table 2
On the basis of precise raw material, aggregate, binder materials and water reducer are first added to forced mixer
Stir, then water and defoamer added, continue stirring to there is notable fluidity, be eventually adding carbon fibre and PP fibers,
Stir.The slurry vibration moulding that will be stirred, prefabrication are stripped after normal temperature stands just foster (48 hours), (20 ± 2) DEG C,
Maintenance obtains industrial or civilian concrete protection material to regulation age in the standard curing room water of relative humidity more than 95%.
Embodiment 3：
The explosion-proof high temperature resistance concrete of the present embodiment, is uniformly combined by various ingredients.Each component presses quality percentage
Than being respectively：30.9% portland cement (42.5 cement, specific surface area 435m2/ kg, apparent density 3.12g/cm3), aggregate
Including lime sand and silica sand, wherein 32.6% lime sand (density 2.50g/cm3, particle size range 0.15-3.0mm),
(particle diameter accounts for 60% to 15.5% silica sand aggregate less than 0.15mm, density 2.65g/cm3), 5.0% mixing material (SiO2Mass ratio accounts for
54%th, CaO accounts for 16%, SO3Account for 25%), 6.2% water, water reducer (naphthalene series high-performance dehydragent, solid content 28%) powder accounts for
The 0.73% of binder materials gross mass, (tensile strength reaches 3200MPA, length 24mm, diameter 0.18mm, density 7.8g/ to steel fibre
cm3) volume volume be 3%, organic fiber (polypropylene fibre, 165 DEG C, length 24.0mm, density 0.91g/cm of fusing point3) volume
Volume is 2%, and organic silicon defoamer volume is the 0.3% of binder materials gross mass.The raw material of the concrete protection material presses matter
It is as shown in table 3 to measure percentage proportioning.
The raw materials used mass percent proportioning of the concrete of table 3
On the basis of precise raw material, first aggregate, binder materials are added to forced mixer and stirred, then
Water, defoamer and water reducer are added, continue stirring to there is notable fluidity, is eventually adding steel fibre and PP fibers, stirring is equal
It is even.The slurry vibration moulding that will be stirred, prefabrication are stripped after normal temperature stands just foster (24 hours), and (20 ± 2) DEG C are relatively wet
Maintenance obtains industrial or civilian concrete protection material to regulation age in the standard curing room water of degree more than 95%.
Examine it is demonstrated experimentally that the concrete protection material of the invention have preferable explosion-proof, shock resistance, high temperature resistance,
The performances such as self-compaction, but also with performances such as higher resistance to compression, bending resistance, rupture strengths.The concrete of the present invention can be used for easy
The work civil engineerings such as combustion solid-liquid gas storage building, the Architectural Equipment for having resistance to elevated temperatures requirement, increased durability requirement, can
With industry with being played a great role on civilian installation, wide market.
Above example only expresses several embodiments of the present invention, and its description is more specific and detailed, but simultaneously
Therefore the limitation to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for one of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention
Protect scope.Therefore, the protection domain of patent of the present invention should be defined by appended claims.
Claims (10)
1. a kind of explosion-proof high temperature resistance concrete, its raw material are respectively by mass percentage：Cement 21-57%, aggregate 25-
65%th, mixing material 2-28%, high tensile strength fiber 0.2-20%, organic fiber 0.05-1.1%, the diminishing in terms of solid content
Agent 0.04-1.2%, defoamer 0.004-1.2% and water 3-14.3%.
2. concrete according to claim 1, wherein cement clinker content is 80%-97% mass percentages in the cement
Than, and C in clinker3S contents are 45%-75% mass percents；The cement is selected from portland cement, normal silicate
Cement, sulfate cement, blast-furance cement and pulverized fuel ash cement and combinations thereof.
3. concrete according to claim 1, wherein the particle diameter of the aggregate is less than 4.75mm, particle diameter is less than 0.15mm's
Fine aggregate accounts for the 15-85% of aggregate gross mass；The aggregate is selected from river sand, silica sand, quartz sand, limestone sand, silicon carbide sand, burning
Tie bauxite sand and diamond dust and combinations thereof.
4. concrete according to claim 1, wherein the mixing material is made up of following component：Active SiO2Quality percentage
Than being 0.3-24%, SO for 40-96%, CaO mass percents3Mass percent is 0.1-34%；The mixing material particle diameter is
Less than the 1/10 of the average grain diameter of the cement, the quality of the mixing material are the 5-35% of the quality of the cement.
5. concrete according to claim 1, wherein the tensile strength of the high tensile strength fiber is not less than 380Mpa,
Density is 1-10g/cm3, a diameter of 0.08-1.2mm, length 3-60mm, draw ratio 30-250；The high-tensile is fine
Dimension is selected from steel fibre and carbon fibre and combinations thereof, and the volume volume of the high tensile strength fiber is the 0.3- of volume of concrete
8.0%.
6. concrete according to claim 5, wherein a diameter of 0.10-0.75mm of the high tensile strength fiber, long
Spend for 10-40mm, draw ratio 60-100.
7. concrete according to claim 1, wherein the fusing point of the organic fiber is 100-400 DEG C, length 3-
60mm, draw ratio 200-900；The volume volume of the organic fiber is the 0.2-3% of volume of concrete.
8. concrete according to claim 1, wherein the water reducer is the polycarboxylic acids diminishing that water-reducing rate is not less than 14%
Agent or naphthalene water reducer；The quality for the water reducer counted using solid content is the gross mass of the cement and the mixing material
0.1-2.0%.
9. concrete according to claim 8, wherein the quality of the water reducer is the cement and the mixing material
The 0.4-1.2% of gross mass.
10. preparing the method for the concrete any one of claim 1 to 9, comprise the following steps：
1) after weighing each raw material, cement, mixing material and aggregate are added into forced mixer stirring；Then by water, water reducer and
Defoamer adds, and continues stirring to there is notable fluidity；Then high tensile strength fiber and organic fiber are added, is stirred；
And
2) the slurry vibration moulding in a mold for allowing step 1) to be formed, normal temperature standing are stripped after just supporting 24 hours or 48 hours, so
Maintenance or natural curing, obtain concrete prefabricated product in laggard water-filling；Or the slurry cast in situs for allowing step 1) to be formed is applied
Work, pours rear covering curing 24 hours or 48 hours, then water drenching or the wet gunnysack maintenance of covering.
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| CN201710851325.4A CN107746219A (en) | 2017-09-20 | 2017-09-20 | Explosion-proof high temperature resistance concrete and preparation method thereof |
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| CN201710851325.4A CN107746219A (en) | 2017-09-20 | 2017-09-20 | Explosion-proof high temperature resistance concrete and preparation method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108409235A (en) * | 2018-03-21 | 2018-08-17 | 陕西建研结构工程股份有限公司 | A kind of very-high performance fiber concrete and preparation method thereof |
| CN108840719A (en) * | 2018-09-11 | 2018-11-20 | 台山市河朗新型环保建材有限公司 | A kind of concrete brick and preparation method thereof that the anticorrosive service life is long |
| CN110357539A (en) * | 2019-08-01 | 2019-10-22 | 西安新意达建筑制品有限公司 | A kind of high-strength heat-resisting concrete and preparation method thereof |
| CN112592134A (en) * | 2020-12-24 | 2021-04-02 | 广州朋悦建材科技发展有限公司 | UHPC with strong explosion resistance and high fire resistance as well as preparation method and application thereof |
| CN112661469A (en) * | 2021-01-29 | 2021-04-16 | 奥泰利新技术集团有限公司 | Novel high-ductility refractory concrete |
| CN114716189A (en) * | 2022-03-21 | 2022-07-08 | 中国建筑第八工程局有限公司 | Door and window opening high-strain capacity precast concrete lintel and preparation method thereof |
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| JP3549507B2 (en) * | 2001-08-30 | 2004-08-04 | 太平洋セメント株式会社 | Explosion-resistant high-strength cementitious cured product and method for producing the same |
| CN105753400A (en) * | 2016-01-22 | 2016-07-13 | 北方工业大学 | High-temperature-burst-resistant self-compacting concrete, preparation method thereof and steel tube concrete |
| CN105801040A (en) * | 2014-12-29 | 2016-07-27 | 中国建筑材料科学研究总院 | Wear-resistant, antiknock and radiation-resistant concrete and preparation method thereof |
| CN105801039A (en) * | 2014-12-29 | 2016-07-27 | 中国建筑材料科学研究总院 | Wear-resistant and antiknock concrete and preparation method thereof |
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| JP3549507B2 (en) * | 2001-08-30 | 2004-08-04 | 太平洋セメント株式会社 | Explosion-resistant high-strength cementitious cured product and method for producing the same |
| CN105801040A (en) * | 2014-12-29 | 2016-07-27 | 中国建筑材料科学研究总院 | Wear-resistant, antiknock and radiation-resistant concrete and preparation method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108409235A (en) * | 2018-03-21 | 2018-08-17 | 陕西建研结构工程股份有限公司 | A kind of very-high performance fiber concrete and preparation method thereof |
| CN108840719A (en) * | 2018-09-11 | 2018-11-20 | 台山市河朗新型环保建材有限公司 | A kind of concrete brick and preparation method thereof that the anticorrosive service life is long |
| CN110357539A (en) * | 2019-08-01 | 2019-10-22 | 西安新意达建筑制品有限公司 | A kind of high-strength heat-resisting concrete and preparation method thereof |
| CN110357539B (en) * | 2019-08-01 | 2021-08-17 | 西安新意达建筑制品有限公司 | High-strength heat-resistant concrete and preparation method thereof |
| CN112592134A (en) * | 2020-12-24 | 2021-04-02 | 广州朋悦建材科技发展有限公司 | UHPC with strong explosion resistance and high fire resistance as well as preparation method and application thereof |
| CN112661469A (en) * | 2021-01-29 | 2021-04-16 | 奥泰利新技术集团有限公司 | Novel high-ductility refractory concrete |
| CN114716189A (en) * | 2022-03-21 | 2022-07-08 | 中国建筑第八工程局有限公司 | Door and window opening high-strain capacity precast concrete lintel and preparation method thereof |
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