CN103553491B - A kind of take discarded glass as concrete of main raw material and preparation method thereof - Google Patents
A kind of take discarded glass as concrete of main raw material and preparation method thereof Download PDFInfo
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- CN103553491B CN103553491B CN201310485188.9A CN201310485188A CN103553491B CN 103553491 B CN103553491 B CN 103553491B CN 201310485188 A CN201310485188 A CN 201310485188A CN 103553491 B CN103553491 B CN 103553491B
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- 239000011521 glass Substances 0.000 title claims abstract description 98
- 239000004567 concrete Substances 0.000 title claims abstract description 72
- 239000002994 raw material Substances 0.000 title claims abstract description 21
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 239000006063 cullet Substances 0.000 claims abstract description 58
- 239000000463 material Substances 0.000 claims abstract description 48
- 239000004568 cement Substances 0.000 claims abstract description 39
- 239000003595 mist Substances 0.000 claims abstract description 34
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000010703 silicon Substances 0.000 claims abstract description 30
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 30
- 239000002245 particle Substances 0.000 claims abstract description 22
- 239000004575 stone Substances 0.000 claims abstract description 21
- 239000000843 powder Substances 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000004576 sand Substances 0.000 claims abstract description 12
- 239000002699 waste material Substances 0.000 claims abstract description 9
- 238000003756 stirring Methods 0.000 claims description 22
- 239000012535 impurity Substances 0.000 claims description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 13
- 238000002156 mixing Methods 0.000 claims description 8
- 239000003638 chemical reducing agent Substances 0.000 claims description 3
- 238000010334 sieve classification Methods 0.000 claims description 3
- 239000011398 Portland cement Substances 0.000 claims description 2
- 230000006835 compression Effects 0.000 abstract description 3
- 238000007906 compression Methods 0.000 abstract description 3
- 239000003292 glue Substances 0.000 description 16
- 238000012216 screening Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 9
- 238000000227 grinding Methods 0.000 description 6
- 239000012615 aggregate Substances 0.000 description 4
- 239000004744 fabric Substances 0.000 description 3
- 238000013467 fragmentation Methods 0.000 description 3
- 238000006062 fragmentation reaction Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000011383 glass concrete Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000003467 diminishing effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000005445 natural material Substances 0.000 description 1
- 229920005646 polycarboxylate Polymers 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a kind of take cullet as the concrete of main raw material, by weight, it is prepared from by the water of the gelling material of 10 ~ 30 parts, the fine aggregate of 30 ~ 40 parts, the coarse aggregate of 40 ~ 50 parts, the admixture of 0.05 ~ 0.45 part and 3.8 ~ 16.5 parts; Wherein, described gelling material by weight percentage, is made up of the cullet micro mist of particle diameter≤30 μm of the cement of 70 ~ 85wt%, 10 ~ 20wt% and the silicon ash of 5 ~ 10wt%; Described fine aggregate is the waste glass powder of II district's medium sand grating; The stone of described coarse aggregate to be particle diameter be 5 ~ 16mm.Concrete of the present invention has not only maximally utilised discarded glass, and has excellent ultimate compression strength and mobility.The present invention also provides described concrete preparation method.
Description
Technical field
The present invention relates to building material field, be specifically related to a kind of concrete, particularly relating to a kind of take building castoff as the concrete of main raw material, and preparation method thereof.
Background technology
Along with the continuous quickening of Urbanization in China, the building castoff problem thereupon produced more and more causes to be paid close attention to widely.How effective cullet is integral part important in building castoff, because cullet is not biodegradable material, carry out resource utilization and recycle and just become a problem anxious to be resolved them.
At glass work, the recycling of cullet can reduce production energy consumption, diminishing raw material energy consumption, but due to cullet complicated component, require high to the removal of impurities of cullet, color separation before requiring recycling, therefore cullet is very limited in the application of producing new glass.
Cullet is used for concrete and has many advantages, as pozzolanic activity (glass powder), water-intake rate are extremely low, weather resistance is high, good fluidity etc., what is more important concrete requires looser to glass colour with foreign matter content, cullet utilization is very large, thus, cullet is imperative for Concrete Industry.
In prior art, more existing cullet is used for research in cement concrete and report.Publication number be refer in the patent documentation of CN102745929A using Abrasive glass dust as adulterant for the production of concrete, the cement of alternative 30 ~ 50%, make discarded glass recovery utilization rate obtain raising to a certain degree, but the concrete performance obtained is still not ideal enough.Publication number is mention a kind of RPC of mixing ultra-fine simple glass powder in the patent documentation of CN103172323A, but the incorporation of glass powder is little in this concrete, effectively can not improve the reuse ratio of discarded glass, and the RPC obtained in this patent documentation also awaits in the performances such as mobility improving.
Summary of the invention
The object of the present invention is to provide a kind of take discarded glass as the concrete of main raw material, has not only maximally utilised discarded glass, and this concrete has excellent ultimate compression strength and mobility.
Another object of the present invention is to provide described concrete preparation method, the method not only improves the utilization ratio of discarded glass to greatest extent, and can ensure that the concrete obtained has excellent strength property, effectively can reduce the possibility that alkali-aggregate reaction occurs simultaneously.
Above-mentioned purpose of the present invention is achieved through the following technical solutions:
Thering is provided a kind of take cullet as the concrete of main raw material, and by weight, it is prepared from by the water of the gelling material of 10 ~ 30 parts, the fine aggregate of 30 ~ 40 parts, the coarse aggregate of 40 ~ 50 parts, the admixture of 0.05 ~ 0.45 part and 3.8 ~ 16.5 parts; Wherein, described gelling material, by weight percentage, is made up of the cullet micro mist of particle diameter≤30 μm of the cement of 70 ~ 85wt%, 10 ~ 20wt% and the silicon ash of 5 ~ 10wt%; Described fine aggregate is the waste glass powder of II district's medium sand grating; The stone of described coarse aggregate to be particle diameter be 5 ~ 16mm.
In preferred embodiments of the present invention, the concrete of described with cullet is main raw material, by weight, it is prepared from by the water of the gelling material of 15 ~ 25 parts, the fine aggregate of 35 ~ 40 parts, the coarse aggregate of 45 ~ 50 parts, the admixture of 0.1 ~ 0.3 part and 5.0 ~ 10.0 parts; Wherein, described gelling material, by weight percentage, is made up of the cullet micro mist of particle diameter≤30 μm of the cement of 70 ~ 75wt%, 15 ~ 20wt% and the silicon ash of 5 ~ 8wt%; Described fine aggregate is the waste glass powder of II district's medium sand grating; The stone of described coarse aggregate to be particle diameter be 5 ~ 16mm.
In the most preferred scheme of the present invention, the concrete of described with cullet is main raw material, by weight, it is prepared from by the water of the gelling material of 20 parts, the fine aggregate of 35 parts, the coarse aggregate of 45 parts, the admixture of 0.24 part and 8 parts; Wherein, described gelling material, by weight percentage, is made up of the cullet micro mist of particle diameter≤30 μm of the cement of 75wt%, 20wt% and the silicon ash of 5wt%; Described fine aggregate is the waste glass powder of II district's medium sand grating, and fineness modulus is 2.4 ~ 2.8; The stone of described coarse aggregate to be particle diameter be 5 ~ 16mm.
In concrete of the present invention, the cullet micro mist specific surface area of described particle diameter≤30 μm is 550 ~ 900m
2/ kg; Preferably obtained by brown and/or white cullet.
In concrete of the present invention, the waste glass powder of II described district's medium sand grating is preferably obtained by green cullet.
In concrete of the present invention, described cement can select ordinary Portland cement, and label is P.O42.5.
In concrete of the present invention, the apparent density of described silicon ash is 2500 ~ 3000kg/m
3, specific surface area is 18 ~ 28 ㎡/g, and median size is 0.1 ~ 0.2 μm, and amorphous silica content is 88 ~ 97%.
In concrete of the present invention, water-cement ratio is 0.38 ~ 0.55.
In concrete of the present invention, described admixture can be acceptable admixture, such as water reducer in the preparation of various concrete, preferred polycarboxylate water-reducer.
It take cullet as the concrete preparation method of main raw material that the present invention also provides described, that all raw materials except admixture and water are stirred more than 20s according to described ratio premix, admixture and water is added again in described ratio, stir more than 120s, obtaining described take cullet as the concrete of main raw material.
The preferred preparation method of the present invention, comprises the following steps:
1) cullet is broken and after removing impurity, by colour sorting;
2) brown and/or white glass separate compiling step 1) the sub-elected glass micro mist of 30 μm such as become particle diameter to be less than;
3) green glass thin broken step 1) sub-elected, then sieve classification, is finally made into the glass fine aggregate of II district's medium sand grating by green glass material level at different levels;
4) by cement, step 2) obtained glass micro mist, silicon ash, step 3) the glass fine aggregate, the stone that obtain stir more than 20s in the mixing of described ratio is pre-, until mixing of materials is full and uniform, obtains premix material;
5) admixture and water added in the premix material that step 4) obtains in described ratio, stir more than 120s, until mixing of materials is full and uniform, obtaining described take cullet as the concrete of main raw material.
The shredder assembly of the broken process described in step 1) preferably uses cullet crusher.
The variegated sorting unit of cullet of the colour sorting operation described in step 1) is preferably the variegated separator of cullet.
Step 2) described in the grinding device of powder-grinding process be preferably ball mill or vibration mill.
Thin broken described in step 3) preferably uses cullet crusher, and described classification preferably uses vibratory screening apparatus.
The concrete preparation method be more preferably of the present invention, comprises following steps:
A, feed: discarded glass is transported in distributor hopper.
B, one-level deironing, screening, cloth: discarded glass in hopper is joined in distributor, with the deironing apparatus in distributor, the metallic impurity in discarded glass are rejected, with the screening plant in distributor, discarded glass is sieved, then by the discarded glass cloth that sieved on respective e Foerderanlage.Screening fine powder out, medium glass directly enter broken process, and thick glass enters manual sorting's removal of impurities operation.
C, manual sorting's removal of impurities: the impurity of the thick glass sieving out in distributor being rejected in course of conveying large volume class by manual type.
D, fragmentation: the fine powder, the thick glass breaking after medium glass and manual sorting's removal of impurities that will sieve out in distributor with shredder assembly.
E, screening are gently mixed: sieved by frit after fragmentation with screening plant, screen out the impurity of lightweight.
F, secondary deironing, the assorted sorting of pottery: with the metallic impurity in cullet impurity sorting equipment rejecting frit and the opaque impurity of ceramic-like.
G, colour sorting: frit is separated by color with cullet variegated sorting unit.
H, grinding: with grinding device, the colour sorting frit such as brown, white is out separated grinding and become glass micro mist.
I, thin broken, classification, grating: with shredder assembly by colour sorting green glass material thin broken out, then use screening plant sieve classification, finally frit level at different levels is made into glass fine aggregate.
J, batching, in advance stirring: the glass micro mist prepared and glass fine aggregate, stone, cement, silicon ash are added in stirrer after preparing burden in following ratio and stirs more than 20s in advance:
Total glue material (cement+glass micro mist+silicon ash), glass fine aggregate, stone total mass in 100%, total glue material 10 ~ 30wt%, glass fine aggregate 30 ~ 40wt%, stone 40 ~ 50wt%.
Total glue material (cement+glass micro mist+silicon ash) total mass in 100%, cement 70 ~ 85wt%, glass micro mist 10 ~ 20wt%, silicon ash 5 ~ 10wt%.
K stirs: load weighted admixture (0.5 ~ 1.5wt% of total glue material amount) and water (water-cement ratio 0.38 ~ 0.55) are joined in the material be stirred in advance and stir more than 120s.
Compared with prior art, in the present invention, cullet is impregnated in the form of powder and fine aggregate simultaneously, respectively instead of cement and sandstone fine aggregate at high proportion, has finally prepared concrete of the present invention with specific overall proportioning together with other feed composition.Concrete of the present invention and preparation method thereof has following beneficial effect:
1) cullet is first made activate micro powder and fine aggregate by the present invention, then it is used in concrete simultaneously, obtaining with cullet is the concrete of main raw material, about 40% of the total unit weight of concrete is made to be all cullet material, relative general technology improves the volume of 20%, the volume of 30% is improve relative to the concrete in CN102745929A, the volume of 35% is improve relative to the concrete of CN103172323A, both the regeneration of cullet had been achieved to greatest extent, again save a large amount of concrete natural material, thus maximally utilised cullet.
2) the present invention uses more activity glass powder, green glass fine aggregate and silicon ash, has both met concrete requirement of strength, the possibility that can prevent alkali-aggregate reaction from occurring to greatest extent again, and concrete can also be made to have excellent mobility.
The present inventor finds through lot of experiments, and the glass micro mist of particle diameter≤30 that obtained to by cullet pulverizing grinder μm, when replacing cement with ratio of the present invention, significantly can reduce concrete ASR swell value; Simultaneously because its specific surface area is large, under identical water-cement ratio, more excellent degree of mobilization can be brought for concrete.Meanwhile, the present inventor also finds, glass powder fine aggregate can produce with the glass micro mist and silicon ash three that replace cement and act synergistically under specified proportion of the present invention, for concrete brings more excellent intensity, particularly strength retention at high temperature has obvious progress than the concrete mixing glass in prior art.In addition, experimentally known, chromic oxide in green glass composition can effectively suppress ASR to expand, therefore the present inventor obtains the rational proportion of green glass replacement fine aggregate on this basis further by experiment sieving, concrete rate of expansion is reduced further, fully ensure that concrete safe handling.
In a word, concrete of the present invention is owing to being mixed with glass powder, glass micro mist and silicon ash simultaneously, respectively to replace fine aggregate and cement very at high proportion, the utilization ratio of cullet is not only made to significantly improve, and three acts synergistically with specified proportion, for the performances such as concrete intensity of the present invention, degree of mobilization and rate of expansion bring remarkable improvement.
Accompanying drawing explanation
Fig. 1 is the concrete process flow sheet of a kind of discarded glass described in embodiment 1.
Embodiment
Embodiment 1:
A kind of C30 discarded glass concrete, preparation process is as follows:
A, discarded glass to be transported in distributor hopper.
B, carry out one-level deironing, screening, cloth with screening distributor.
The impurity of large volume class rejected by C, thick glass in course of conveying by manual type.
D, use cullet crusher are by the thick glass breaking after screening fine powder out, medium glass and manual sorting's removal of impurities.
E, with proportion sieve frit after fragmentation is sieved, screen out the impurity of lightweight.
Metallic impurity in F, use cullet impurity sorter rejecting frit and the opaque impurity of ceramic-like.
G, with cullet variegated separator, frit to be separated by color.
H, with vibration mill, the colour sorting frit such as brown, white is out separated grinding and become glass micro mist stand-by, glass grain size of micropowder≤30 μm.
I, use cullet crusher are by colour sorting green glass material thin broken out, then 0.16-0.315mm is classified into bolting, 0.315-0.63mm, 0.63-1.25mm, 1.25-2.5mm, tetra-districts, are finally made into sand glass fine aggregate in IIth district by frit level at different levels.
J, batching, in advance stirring: the glass micro mist prepared and glass fine aggregate, stone, cement, silicon ash are added in stirrer after preparing burden in following ratio and stirs 30s in advance:
Total glue material (cement+glass micro mist+silicon ash), glass fine aggregate, stone (particle diameter is 5 ~ 16mm) total mass in 100%, total glue material 20wt%, glass fine aggregate 35wt%, stone 45wt%.
Total glue material (cement+glass micro mist+silicon ash) total mass in 100%, cement 75wt%, glass micro mist 20wt%, silicon ash 5wt%.
K stirs: load weighted admixture (1.5wt% of total glue material amount) and water (water-cement ratio 0.38) are joined in the material be stirred in advance and stir 120s.
2, discarded glass concrete performance:
Go out the machine slump/divergence 230/600, mobility is fabulous, 3d average intensity 16.8Mpa, 28d average intensity 45.2Mpa.
Embodiment 2
Take cullet as a concrete for main raw material, be prepared according to the method for embodiment 1, just step J and K is as follows:
J, batching, in advance stirring: the glass micro mist prepared and glass fine aggregate, stone, cement, silicon ash are added in stirrer after preparing burden in following ratio and stirs 30s in advance:
Total glue material (cement+glass micro mist+silicon ash), glass fine aggregate, stone (particle diameter is 5 ~ 16mm) total mass in 100%, total glue material 10wt%, glass fine aggregate 40wt%, stone 50wt%.
Total glue material (cement+glass micro mist+silicon ash) total mass in 100%, cement 70wt%, glass micro mist 20wt%, silicon ash 10wt%.
K stirs: load weighted admixture (1.2wt% of total glue material amount) and water (water-cement ratio 0.41) are joined in the material be stirred in advance and stir 120s.
The cullet concrete performance obtained is as follows:
Go out the machine slump/divergence 220/650, mobility is fabulous, 3d average intensity 15.1Mpa, 28d average intensity 41.5Mpa.
Embodiment 3
Take cullet as a concrete for main raw material, be prepared according to the method for embodiment 1, just step J and K is as follows:
J, batching, in advance stirring: the glass micro mist prepared and glass fine aggregate, stone, cement, silicon ash are added in stirrer after preparing burden in following ratio and stirs 30s in advance:
Total glue material (cement+glass micro mist+silicon ash), glass fine aggregate, stone (particle diameter is 5 ~ 16mm) total mass in 100%, total glue material 25wt%, glass fine aggregate 33wt%, stone 42wt%.
Total glue material (cement+glass micro mist+silicon ash) total mass in 100%, cement 78wt%, glass micro mist 17wt%, silicon ash 5wt%.
K stirs: load weighted admixture (2.0wt% of total glue material amount) and water (water-cement ratio 0.35) are joined in the material be stirred in advance and stir 120s.
The cullet concrete performance obtained is as follows:
Go out the machine slump/divergence 220/550, mobility is fabulous, 3d average intensity 22.7Mpa, 28d average intensity 62.8Mpa.
Embodiment 4
Application 1-2 in concrete prepared by the embodiment of the present invention 3 method and CN102745929A table 2 and the concrete applying 1-3 carry out Performance comparision, and result is as shown in table 1 below.
Table 1
Table 3 shows the concrete that concrete performance of the present invention is all better than CN102745929A.
Embodiment 5
The concrete of concrete prepared by the embodiment of the present invention 1 method and CN103172323A embodiment 8 and 9 carries out Performance comparision, and result is as shown in table 2 below.
Table 2
Table 2 shows the concrete that concrete work performance of the present invention and ultimate compression strength are significantly better than CN103172323A.
Claims (8)
1. one kind take cullet as the concrete of main raw material, it is characterized in that, by weight, it is prepared from by the water of the gelling material of 10 ~ 30 parts, the fine aggregate of 30 ~ 40 parts, the coarse aggregate of 40 ~ 50 parts, the admixture of 0.05 ~ 0.45 part and 3.8 ~ 16.5 parts; Wherein, described gelling material by weight percentage, is made up of the cullet micro mist of particle diameter≤30 μm of the cement of 70 ~ 85wt%, 10 ~ 20wt% and the silicon ash of 5 ~ 10wt%; Described fine aggregate is the waste glass powder of II district's medium sand grating; The stone of described coarse aggregate to be particle diameter be 5 ~ 16mm; The cullet micro mist specific surface area of described particle diameter≤30 μm is 550 ~ 900m
2/ kg, is obtained by brown and/or white cullet; The waste glass powder of II described district's medium sand grating is obtained by green cullet.
2. concrete according to claim 1, is characterized in that: by weight, and it is prepared from by the water of the gelling material of 15 ~ 25 parts, the fine aggregate of 35 ~ 40 parts, the coarse aggregate of 45 ~ 50 parts, the admixture of 0.1 ~ 0.3 part and 5.0 ~ 10.0 parts; Wherein, described gelling material, by weight percentage, is made up of the cullet micro mist of particle diameter≤30 μm of the cement of 70 ~ 75wt%, 15 ~ 20wt% and the silicon ash of 5 ~ 8wt%; Described fine aggregate is the waste glass powder of II district's medium sand grating; The stone of described coarse aggregate to be particle diameter be 5 ~ 16mm.
3. concrete according to claim 1, is characterized in that: by weight, and it is prepared from by the water of the gelling material of 20 parts, the fine aggregate of 35 parts, the coarse aggregate of 45 parts, the admixture of 0.24 part and 8 parts; Wherein, described gelling material, by weight percentage, is made up of the cullet micro mist of particle diameter≤30 μm of the cement of 75wt%, 20wt% and the silicon ash of 5wt%; Described fine aggregate is the waste glass powder of II district's medium sand grating, and fineness modulus is 2.4 ~ 2.8; The stone of described coarse aggregate to be particle diameter be 5 ~ 16mm.
4. any one concrete described in claim 1-3, is characterized in that: described cement is ordinary Portland cement, and label is P.O 42.5.
5. any one concrete described in claim 1-3, is characterized in that: the apparent density of described silicon ash is 2500 ~ 3000kg/m
3, specific surface area is 18 ~ 28 ㎡/g, and median size is 0.1 ~ 0.2 μm, and amorphous silica content is 88 ~ 97%.
6. any one concrete described in claim 1-3, is characterized in that: described admixture is water reducer.
7. according to claim 1 take cullet as the concrete preparation method of main raw material, that all raw materials except admixture and water are stirred more than 20s according to described ratio premix, admixture and water is added again in described ratio, stir more than 120s, obtaining described take cullet as the concrete of main raw material.
8. preparation method according to claim 7, comprises the following steps:
1) cullet is broken and after removing impurity, by colour sorting;
2) by step 1) the brown and/or white glass separate compiling that sub-elects becomes particle diameter to be less than or equal to the glass micro mist of 30 μm;
3) by step 1) the green glass thin broken that sub-elects, then sieve classification, is finally made into the glass fine aggregate of II district's medium sand grating by green glass material level at different levels;
4) by cement, step 2) obtained glass micro mist, silicon ash, step 3) obtained glass fine aggregate, stone by described ratio mixing pre-stirring more than 20s, until mixing of materials is full and uniform, obtain premix material;
5) admixture and water are added step 4 in described ratio) in the premix material that obtains, stir more than 120s, until mixing of materials is full and uniform, obtaining described take cullet as the concrete of main raw material.
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| CN103086655A (en) * | 2011-11-04 | 2013-05-08 | 香港理工大学 | Method for preparing concrete brick |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| NL2032455A (en) * | 2021-07-14 | 2023-01-19 | Zhengzhou Univ Multi Functional Design And Research Academy Co Ltd | Broken brick and waste glass aggregate concrete for reamed piles and preparation method thereof |
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