CN106747580A - A kind of autoclave aerated concrete building block for adding rice hull ash and preparation method thereof - Google Patents
A kind of autoclave aerated concrete building block for adding rice hull ash and preparation method thereof Download PDFInfo
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- CN106747580A CN106747580A CN201611114296.5A CN201611114296A CN106747580A CN 106747580 A CN106747580 A CN 106747580A CN 201611114296 A CN201611114296 A CN 201611114296A CN 106747580 A CN106747580 A CN 106747580A
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- rice hull
- hull ash
- building block
- aerated concrete
- concrete building
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Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/50—Producing shaped prefabricated articles from the material specially adapted for producing articles of expanded material, e.g. cellular concrete
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/245—Curing concrete articles
Abstract
The invention belongs to building material technical field, more particularly to a kind of autoclave aerated concrete building block for adding rice hull ash and preparation method thereof, including 0.8 ~ 1.5 part of 0 ~ 40 part of levigate quartz sand, 8~20 parts of cement, 10 ~ 20 parts of quick lime, 40~80 parts of rice hull ash and aluminium cream.The invention also discloses a kind of preparation method of the autoclave aerated concrete building block for adding rice hull ash.The autoclave aerated concrete building block of present invention addition rice hull ash is also with mechanical property and rotproofness higher, engineering-environment and more extensive using the applicability at position in addition to good thermal and insulating performance.
Description
Technical field
The invention belongs to building material technical field, more particularly to a kind of steam-pressing aero-concrete for adding rice hull ash
Building block and preparation method thereof.
Background technology
Steam-pressing aero-concrete (AAC：Autoclaved Aerated Concrete) it is with siliceous material (cement and stone
Sand) and calcareous material (lime, gypsum) be primary raw material, using foaming agent in slurry with the chemical reaction of its component and produce
Angry body, by mixing, cast, it is quiet stop, cut, high-pressure curing, go out the formation of the processing routes such as kettle with light porous structure
Silicates product.
At present, in developed countries such as the U.S., Japan, air entrained concrete has turned into main materials for wall.Over the past thirty years
It is the period of AAC fast developments.However, sand aerated concrete is used as novel wall energy-saving structure system, its technological development is
The aspect such as systemization, standardization, the popularization and application scale of material production still relatively lags behind.In recent years, promoting the use of in AAC
Cheng Zhong, also exposes the performances such as its mechanics, thermal technology and corrosion resistance not ideal enough；Water absorption rate is big, easy to crack；Auxiliary material is inadequate
It is supporting；Production technology falls behind relatively；Unified AAC energy-saving design in construction and construction inspection rules are not formed also, architectural design
During can not give full play to sand aerated concrete lightweight and heat-insulated mechanics thermal property advantage；To steam-pressing aero-concrete
Self-heat conserving performance does not have systematic efficiency test and appraisal data.Therefore, the engineering that steam-pressing aero-concrete is constrained to a certain extent should
With.
China is Rice Cropping big country, and the rice husk for having nearly 40,000,000 t every year is produced, used as a kind of crop by-product, rice
Shell is a kind of renewable resource rich and easy to get.Over nearly 30 years, the research of rice husk makes it be used widely in various fields, its
In quite a few be as the supplement fuel of thermal power generation.Main component after combusting rice hull is silica, with higher
Hydration activity；Rice hull ash is reproducible biological material, belongs to Ecological Building Materials.Research shows, is taken as admixture
It is used to improve concrete performance for part of cement, with good economic and social profit.Also there is research to add rice hull ash at present
Add and used as raw material in steam-pressing aero-concrete, but mainly added rice hull ash as a small amount of auxiliary material, rather than by rice husk
Ash is used as main even unique sources of silica.
The content of the invention
The first object of the present invention is：Overcome autoclave aerated concrete building block mechanics of the prior art, thermal property not
A kind of enough preferable technical problems, there is provided autoclave aerated concrete building block of addition rice hull ash.
The technical solution adopted for the present invention to solve the technical problems is：A kind of steam-pressing aero-concrete for adding rice hull ash
Building block, in terms of mass parts, including 0~40 part of levigate quartz sand, 8~20 parts of cement, 10~20 parts of quick lime, rice hull ash 40~80
0.8~1.5 part of part and aluminium cream.
Preferably, in terms of mass parts, it is described addition rice hull ash autoclave aerated concrete building block include levigate quartz sand 0~
0.8~1.2 part of 37.5 parts, 10~20 parts of cement, 10~20 parts of quick lime, 37.5~75 parts of rice hull ash and aluminium cream.
Preferably, in terms of mass parts, it is described addition rice hull ash autoclave aerated concrete building block include levigate quartz sand 0~
0.8~1.2 part of 18.7 parts, 10~20 parts of cement, 10~20 parts of quick lime, 56.2~75 parts of rice hull ash and aluminium cream.
Preferably, the rice hull ash calcines 1h by rice husk under 650 DEG C of high temperature, through ball mill grinding after cooling, and crosses 60 μ
M sieves are obtained.
Preferably, dioxide-containing silica >=80% in the levigate quartz sand, clay content≤3%, average grain diameter be 80~
120um。
Preferably, 6~7min of the quick lime digestion time, 75 DEG C of digestion condition, effective CaO content >=75%, 80 μm
Square hole screen tails over 12.0%.
Preferably, the cement selection strength grade is the Portland cement of 42.5MPa.
Preferably, active aluminium content >=65% in the aluminium cream, 0.75mm screen clothes tail over≤2.5%, and 30min rate of gas generation
>=99%.
The second object of the present invention is：Not enough managed for sand aerated concrete block mechanics, thermal property in the prior art
A kind of technical problem thought, there is provided autoclave aerated concrete building block preparation method of addition rice hull ash.
The technical solution adopted for the present invention to solve the technical problems is：A kind of steam-pressing aero-concrete for adding rice hull ash
The preparation method of building block, comprises the following steps：
(1) 40~80 parts of 0~40 part of levigate quartz sand, 8~20 parts of cement, 10~20 parts of quick lime and rice hull ash, stirring 1
~2min, until mixture stirs；
(2) 1~5min is stirred in the continuation that added water in the mixture obtained in step (1), forms uniform sizing material, the slurry
Middle water-solid ratio is 0.65~0.75；
(3) metering part aluminium cream, 1~2min of stirring is added to obtain finished product slurry in the slurry that step (2) is obtained；
(4) the finished product slurry that step (3) is obtained is cast in mould, be placed in it is quiet in 45 DEG C of insulating box stop 2~5h,
Foaming forms the autoclave aerated concrete building block semi-finished product of volume stability；
(5) the autoclave aerated concrete building block semi-finished product that step (4) is obtained are entered into kettle steam-cured, steam-cured 6~16h of cycle, first
Lead to steam heating since normal temperature, still kettle curing temperature is 160~200 DEG C, 0.9~1.2MPa of constant temperature and pressure；Steam-cured completion
Obtain adding the autoclave aerated concrete building block of rice hull ash afterwards.
Preferably, water-solid ratio is 0.68~0.75 in the slurry；Further, in the slurry water-solid ratio be 0.70~
0.75。
The beneficial effects of the invention are as follows, there is provided addition rice hull ash autoclave aerated concrete building block used it is a high proportion of
Rice hull ash replaces levigate quartz sand, is remarkably improved the silicone content in AAC raw material, and rice hull ash is reproducible biological material
Material, belongs to Ecological Building Materials, and partially or completely levigate quartz sand is substituted using rice hull ash, advantageously reduces production cost, and in fact
The resource recycling of existing crop by-product；Can effectively reduce the steam-cured time, while being conducive to C-S-H gels to Tuo Beimo
Carry out stone transformation.
Brief description of the drawings
Fig. 1 is different rice hull ash volume sample XRD spectrums.
Fig. 2 is different rice hull ash volume sample electron-microscope scanning collection of illustrative plates.
Specific embodiment
Embodiment 1
A kind of preparation method of the autoclave aerated concrete building block for adding rice hull ash, comprises the following steps：
(1) 37.5 parts of 37.5 parts of levigate quartz sand, 10 parts of cement, 15 parts of quick lime and rice hull ash are weighed, stirring 1~
2min, until mixture stirs；
(2) 1~5min is stirred in the continuation that added water in the mixture obtained in step (1), forms uniform sizing material, the slurry
Middle water-solid ratio is 0.68；
(3) 1.2 parts of aluminium cream, 1~2min of stirring is added to obtain finished product slurry in the slurry that step (2) is obtained；
(4) the finished product slurry that step (3) is obtained is cast in mould, be placed in it is quiet in 45 DEG C of insulating box stop 2~5h,
Foaming forms the autoclave aerated concrete building block semi-finished product of volume stability；
(5) the autoclave aerated concrete building block semi-finished product that step (4) is obtained are entered into kettle steam-cured, steam-cured cycle 6h, first from normal
Temperature starts logical steam heating, and still kettle curing temperature is 160 DEG C, constant temperature and pressure 1.0MPa；Obtain adding rice husk after the completion of steam-cured
The autoclave aerated concrete building block of ash.
Embodiment 2
A kind of preparation method of the autoclave aerated concrete building block for adding rice hull ash, comprises the following steps：
(1) 56.3 parts of 18.7 parts of levigate quartz sand, 10 parts of cement, 15 parts of quick lime and rice hull ash are weighed, stirring 1~
2min, until mixture stirs；
(2) 1~5min is stirred in the continuation that added water in the mixture obtained in step (1), forms uniform sizing material, the slurry
Middle water-solid ratio is 0.70；
(3) 1.0 parts of aluminium cream, 1~2min of stirring is added to obtain finished product slurry in the slurry that step (2) is obtained；
(4) the finished product slurry that step (3) is obtained is cast in mould, be placed in it is quiet in 45 DEG C of insulating box stop 2~5h,
Foaming forms the autoclave aerated concrete building block semi-finished product of volume stability；
(5) the autoclave aerated concrete building block semi-finished product that step (4) is obtained are entered into kettle steam-cured, steam-cured cycle 6h, first from normal
Temperature starts logical steam heating, and still kettle curing temperature is 160 DEG C, constant temperature and pressure 1.0MPa；Obtain adding rice husk after the completion of steam-cured
The autoclave aerated concrete building block of ash.
Embodiment 3
A kind of preparation method of the autoclave aerated concrete building block for adding rice hull ash, comprises the following steps：
(1) 75 parts of 10 parts of cement, 15 parts of quick lime and rice hull ash are weighed, 1~2min is stirred, until mixture stirring is equal
It is even；
(2) 1~5min is stirred in the continuation that added water in the mixture obtained in step (1), forms uniform sizing material, the slurry
Middle water-solid ratio is 0.74；
(3) 1.2 parts of aluminium cream, 1~2min of stirring is added to obtain finished product slurry in the slurry that step (2) is obtained；
(4) the finished product slurry that step (3) is obtained is cast in mould, be placed in it is quiet in 45 DEG C of insulating box stop 2~5h,
Foaming forms the autoclave aerated concrete building block semi-finished product of volume stability；
(5) the autoclave aerated concrete building block semi-finished product that step (4) is obtained are entered into kettle steam-cured, steam-cured cycle 6h, first from normal
Temperature starts logical steam heating, and still kettle curing temperature is 160 DEG C, constant temperature and pressure 1.0MPa；Obtain adding rice husk after the completion of steam-cured
The autoclave aerated concrete building block of ash.
Comparative example 1
A kind of preparation method of autoclave aerated concrete building block, comprises the following steps：
(1) 75 parts of 10 parts of cement, 15 parts of quick lime and levigate quartz sand are weighed, 1~2min is stirred, until mixture stirring
Uniformly；
(2) 1~5min is stirred in the continuation that added water in the mixture obtained in step (1), forms uniform sizing material, the slurry
Middle water-solid ratio is 0.60；
(3) 1.2 parts of aluminium cream, 1~2min of stirring is added to obtain finished product slurry in the slurry that step (2) is obtained；
(4) the finished product slurry that step (3) is obtained is cast in mould, be placed in it is quiet in 45 DEG C of insulating box stop 2~5h,
Foaming forms the autoclave aerated concrete building block semi-finished product of volume stability；
(5) the autoclave aerated concrete building block semi-finished product that step (4) is obtained are entered into kettle steam-cured, steam-cured cycle 16h, first from normal
Temperature starts logical steam heating, and still kettle curing temperature is 160 DEG C, constant temperature and pressure 1.0MPa；Obtain adding rice husk after the completion of steam-cured
The autoclave aerated concrete building block of ash.
Test example 1
After sample takes out from still kettle, after being placed in 7d at room temperature, with reference to GB/T 11969《Steam-pressing aero-concrete performance
Test method》Carry out performance test.
Intensity test：Sample dimensions 100mm × 100mm × 100mm, every group takes 3 samples and carries out parallel test, examination
Sample moisture control is 10% or so.
Dry density is tested：The cuboid sample of 100mm × 100mm × 100mm is chosen, taking 3 samples carries out parallel test.
Determination of conductive coefficients：With reference to JGJ51-2002《Lightweight aggregate concrete technology code》Carry out, with 3 pieces of test specimens in experiment
It it is 1 group, wherein 1 piece of thin test specimen (200mm × 200mm × 20mm), thick 2 pieces of test specimen (200mm × 200mm × 60mm).
Microcosmic test：Take brokenly a small amount of sample after type, with absolute ethyl alcohol terminate aquation, it is vacuum dried after swept for SEM
Retouch electronic microscope photos；Sample segment grinds to form powdery, after drying for X-ray diffraction analysis.
| Inspection project | Embodiment 1 | Embodiment 2 | Embodiment 3 | Comparative example 1 |
| Strength grade | A3.5 | A2.5 | A2.0 | A5.0 |
| Dry density (kg/m3) | 426 | 365 | 330 | 600 |
| Thermal conductivity factor (W/m.K) | 0.170 | 0.135 | 0.115 | 0.225 |
Dry density is mono- important technical indicator of AAC, GB/T11968《Autoclave aerated concrete building block》According to dry density
AAC is divided into B03, six grades of B04, B05, B06, B07 and B08.The application takes the AAC of B06 density ratings as research
Sample, Fig. 1 gives influence of the rice hull ash volume to dry density.As seen from the figure, rice hull ash volume is aobvious on the influence of AAC dry densities
Write, as volume increases, the reduction of its dry density.For comparative example 1, its dry density is 600kg/m3Left and right, meeting B06 mass will
Ask, when rice hull ash volume is 25%, its dry density is reduced to 500kg/m3Left and right, meets B05 technical property requirements；And work as rice
Shell ash replaces quartz sand completely, and dry density is 330kg/m3Left and right, meets B03 technical property requirements.In production, different densities
The AAC of grade is mainly by adjusting content of aluminium powder to control.The study show that, when aluminium powder volume is constant, introducing rice hull ash will
The dry density of AAC is greatly lowered.Analyzing its reason has two：1) with levigate quartz sand (2.59g/cm3) compare, rice hull ash tool
There is relatively low apparent density (2.13g/cm3) and porous internal pore structure；2) rice hull ash is mixed, to ensure the thick of slurry
Degree, the water-solid ratio of sample is larger, and after mixture hardening, inside produces more holes, further reduces the dry density of AAC.
Addition rice hull ash can reduce the thermal conductivity factor of AAC, lift thermal and insulating performance.The thermal and insulating performance of material is main
Relevant with its internal pore structure, under the conditions of identical apparent density, internal dead-end pore is more, and its thermal conductivity factor is lower.Phase
For levigate quartz sand, rice hull ash inside is in loose structure, is conducive to the reduction of its thermal conductivity factor.
With the increase of rice hull ash volume, declining occurs in the compression strength of AAC.The compression strength of comparative example 1 is 5.5MPa；
When rice hull ash replaces quartz sand 25%, compression strength is reduced to 4.30MPa, as substitution amount continues to increase to 50%, 75% He
When 100%, its compression strength is reduced to 3.25MPa and 2.93MPa and 2.18MPa successively.Compared with comparative example 1, rice hull ash is mixed
AAC its water-solid ratio has increased, and this is probably the major reason for causing compression strength to decline.But can by the analysis to dry density
Know, admixture rice hull ash also results in the decline of AAC dry densities.For AAC, intensity is its Properties Control with the balance of density
One important indicator.
Further to analyze rice hull ash to structure and the mechanism of action of performance, the sample for choosing steam-cured 6h carries out XRD mineral
Constituent analysis, gained XRD spectrum is shown in Fig. 1.As seen from the figure, SiO in the hydrated product of comparative example 12Diffraction peak intensity is maximum, shows
There are a large amount of quartz sands to have neither part nor lot in hydration reaction, with the increase of rice hull ash substitution amount, its diffraction peak gradually weakens, and works as rice hull ash
When replacing 100%, SiO has been had no2Diffraction maximum.Meanwhile, as rice hull ash volume increases, tobermorite diffraction peak gradually increases
By force, Ca (OH)2Diffraction peak is gradually reduced, until during 100% substitution of rice hull ash, its diffraction peak disappears.This shows, is steaming
Activity silica higher in rice hull ash under the conditions of supporting, can rapidly with Ca (OH)2Generation hydration reaction generates aquation silicon
Sour calcium.
Fig. 2 gives the stereoscan photograph of steam-cured 6h various samples.For comparative example 1 (Fig. 2 a), mainly some classes
The tobermorite of needle-like is similar to, with the increase of rice hull ash volume, such as rice hull ash substitution 25% (Fig. 2 b) and 50% (Fig. 2 c),
Needle-like tobermorite is replaced by block or tabular tobermorite；When rice hull ash volume continues to increase, i.e. rice hull ash substitution
75% quartz sand (Fig. 2 d), tobermorite is presented curling and foliaceous；When rice hull ash replaces quartz sand completely (Fig. 2 e), support
Shellfish mullite is into small grass-like.Under steam-cured environment, CaO-SiO2-H2O systems hydrated product is mainly influenceed by Ca/Si ratios.In contrast
In example 1, due to active relatively low, the Ca/Si (＞ 1) higher of participation hydration reaction of quartz sand, the tobermorite of generation is in
Needle-like；As the rice hull ash of high activity replaces quartz sand, i.e. when Ca/Si is than reducing, tobermorite is converted into sheet by needle-like
And tabular；When Ca/Si ratios are between 1 and 0.8, tobermorite is presented small grass-like distribution, in preferred proportion.
In general, when rice hull ash replaces quartz sand ratio up to or over 50%, the steam pressurized coagulation being made
The steam-cured time needed for earth building blocks is shorter, and the quartz sand autoclave aerated concrete building block that the cost of raw material is also more traditional is lower；Together
When, the autoclave aerated concrete building block being made has relatively low thermal conductivity factor, and intensity is relatively reasonable with the balance of density
Level.
With above-mentioned according to desirable embodiment of the invention as enlightenment, by above-mentioned description, relevant staff is complete
Various changes and amendments can be carried out without departing from the scope of the technological thought of the present invention' entirely.The technology of this invention
Property scope is not limited to the content on specification, it is necessary to its technical scope is determined according to right.
Claims (10)
1. a kind of autoclave aerated concrete building block for adding rice hull ash, it is characterised in that in terms of mass parts, including levigate quartz sand 0
0.8 ~ 1.5 part of ~ 40 parts, 8~20 parts of cement, 10 ~ 20 parts of quick lime, 40~80 parts of rice hull ash and aluminium cream.
2. the autoclave aerated concrete building block of rice hull ash is added as claimed in claim 1, it is characterised in that in terms of mass parts, institute
State addition rice hull ash autoclave aerated concrete building block include 0 ~ 37.5 part of levigate quartz sand, 10~20 parts of cement, quick lime 10 ~
0.8 ~ 1.2 part of 20 parts, 37.5~75 parts of rice hull ash and aluminium cream.
3. the autoclave aerated concrete building block of rice hull ash is added as claimed in claim 1, it is characterised in that the addition rice husk
The autoclave aerated concrete building block of ash includes 0 ~ 18.7 part of levigate quartz sand, 10~20 parts of cement, 10 ~ 20 parts of quick lime, rice husk
0.8 ~ 1.2 part of 56.2~75 parts of ash and aluminium cream.
4. the autoclave aerated concrete building block of addition rice hull ash as claimed in claim 1, it is characterised in that the rice hull ash by
Rice husk calcines 1h under 650 DEG C of high temperature, and through ball mill grinding after cooling, and 60 μm of sieves excessively are obtained.
5. the autoclave aerated concrete building block of rice hull ash is added as claimed in claim 1, it is characterised in that the levigate quartz
Dioxide-containing silica >=80% in sand, clay content≤3%, average grain diameter is 80 ~ 120um.
6. the autoclave aerated concrete building block of rice hull ash is added as claimed in claim 1, it is characterised in that the cement selection
Strength grade is the Portland cement of 42.5MPa.
7. the autoclave aerated concrete building block of rice hull ash is added as claimed in claim 1, it is characterised in that living in the aluminium cream
Property aluminium content >=65%, 0.75mm screen clothes tail over≤2.5%, and 30min rate of gas generation >=99%.
8. the preparation method of the autoclave aerated concrete building block of a kind of addition rice hull ash as described in any one of claim 1 ~ 7,
It is characterized in that comprising the following steps：
（1）40~80 parts of 0 ~ 40 part of levigate quartz sand, 8~20 parts of cement, 10 ~ 20 parts of quick lime and rice hull ash, stirring 1 ~ 2
Min, until mixture stirs；
（2）In step（1）In the continuation that adds water in the mixture that obtains stir 1 ~ 5min, form uniform sizing material, the slurry reclaimed water
Gu than being 0.65 ~ 0.75；
（3）In step（2）Metering part aluminium cream, 1 ~ 2 min of stirring is added to obtain finished product slurry in the slurry for obtaining；
（4）By step（3）The finished product slurry for obtaining is cast in mould, is placed in quiet in 45 DEG C of insulating box stopping 2 ~ 5h, foaming
Form the autoclave aerated concrete building block semi-finished product of volume stability；
（5）By step（4）It is steam-cured that the autoclave aerated concrete building block semi-finished product for obtaining enter kettle, steam-cured 6 ~ 16h of cycle, first from normal temperature
Start logical steam heating, still kettle curing temperature is 160 ~ 200 DEG C, 0.9 ~ 1.2MPa of constant temperature and pressure；Added after the completion of steam-cured
Plus the autoclave aerated concrete building block of rice hull ash.
9. the autoclave aerated concrete building block of rice hull ash is added as claimed in claim 8, it is characterised in that the slurry reclaimed water
Gu than being 0.68 ~ 0.75.
10. the autoclave aerated concrete building block of rice hull ash is added as claimed in claim 9, it is characterised in that in the slurry
Water-solid ratio is 0.70 ~ 0.75.
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| CN110482962A (en) * | 2019-09-18 | 2019-11-22 | 哈尔滨工业大学 | A kind of cement-based material, preparation and its method for dismounting that readily removable can be removed and reuse |
| CN115427372A (en) * | 2020-04-28 | 2022-12-02 | 弗劳恩霍夫应用研究促进协会 | Method for producing autoclaved aerated concrete by using silicon dioxide raw material with solubility higher than quartz |
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| CN110304901A (en) * | 2019-07-12 | 2019-10-08 | 铜仁学院 | A kind of preparation method of electrolytic manganese residues water-permeable brick and air brick |
| CN110330281A (en) * | 2019-07-17 | 2019-10-15 | 广西大学 | A kind of bagasse ash concrete and preparation method thereof |
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Application publication date: 20170531 |