CN107083847B - A method of masonry is repaired using oyster shell and microorganism - Google Patents
A method of masonry is repaired using oyster shell and microorganism Download PDFInfo
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- CN107083847B CN107083847B CN201710265141.XA CN201710265141A CN107083847B CN 107083847 B CN107083847 B CN 107083847B CN 201710265141 A CN201710265141 A CN 201710265141A CN 107083847 B CN107083847 B CN 107083847B
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- oyster shell
- masonry
- moss
- pumpkin
- fermentation
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Classifications
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- 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
- E04G23/0211—Arrangements for filling cracks or cavities in building constructions using injection
-
- 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
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/026—Proteins or derivatives thereof
-
- 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
- C04B2111/72—Repairing or restoring existing buildings or building materials
Abstract
The present invention relates to a kind of methods using oyster shell and microorganism repairing masonry, belong to building repairing technical field.The present invention is immersed in oyster shell gap with moisture first, ice crystal is formed through liquid nitrogen frozen to which oyster shell is burst in volume increase, it is ground again to obtain oyster shell powder, the fermentation liquid rich in microorganism is made by fermenting, using collagen gel as nutriment, it is injected in masonry gap after three is mixed, carbon dioxide and heat are generated during microorganism feeding nutriment metabolism, calcium carbonate and carbon dioxide reaction when maintenance in the moisture and oyster shell of sprinkle generate soluble calcium bicarbonate and immerse inside masonry crack, calcium bicarbonate re-forms fine and close calcium carbonate crystal under heat effect, by masonry gap plugging, achieve the purpose that repair masonry, the calcium carbonate crystal compact structure intensity generated after present invention repairing is high, shrinkage cracking will not be generated, ageing resistance is better than organic material, with wide application Prospect.
Description
Technical field
The present invention relates to a kind of methods using oyster shell and microorganism repairing masonry, belong to building repairing technology neck
Domain.
Background technique
Masonry structure is seized of consequence in ancient building field as a kind of traditional structure type.Brick
The main architectural style of stone masonry structure has: the military architectures such as city wall, watchtower, the religious architectures such as pagoda, temple and palace,
The residential architectures such as building.However, the Brittleness of masonry material determines that the anti-seismic performance of masonry structure is bad, and ancient times
The intensity of masonry mortar is not generally high, is easy by the chemical weatherings such as dry and wet, freeze thawing and the physical weatherings such as cold and hot, crisp alkali, acid rain
And biological corrosion etc. influences, and further decreases material bond strength, needs to give reinforcement protection using certain technological means.
Masonry structure ancient building is reinforced, main principle is that under the premise of guaranteeing structure safety, as far as possible
Reduce influence of the engineering measure to original structure, at present frequently with method have increasing section area method, steel-encasing strengthening method, carbon
Fiber reinforced method and four kinds of chemical grouting method.The material that wherein chemical grouting pours on physicochemical property should as far as possible with original structure
Material matches.Common lime material, is unable to reach the intensity of needs in a short time.And cement class material and reinforcing are tied
Structure mismatches, and is easy to produce the secondary destruction of unconsolidated regions, inevitably results from shrinkage cracking phenomenon in hardening process,
The high alkalinity of cement class grouting material also can generate crisp alkali breakoff phenomenon being reinforced inside masonry structure.And it is with epoxy resin
The organic material of representative, the inorganic material of the materials such as ess-strain performance and thermal coefficient fundamental property and masonry structure
Material difference is larger；After reinforcing, the material micropore in masonry structure is blocked by organic gel, makes that structure is integrally permeable, gas permeability reduces；
Furthermore organic material is easy aging, and interface performance is bad, there is more serious problem of environmental pollution.
Because the invention it is a kind of it is high-intensitive, shrinkage cracking and the novel masonry reinforcement means that crisp alkali destroys will not be generated
There is positive meaning to building repairing field.
Summary of the invention
Present invention mainly solves the technical issues of, for it is currently used repairing masonry method, there are repairing materials
Material intensity is low, hardening process generates shrinkage cracking leads to the defect of repair efficiency difference, provides a kind of utilization oyster shell and micro- life
The method of object repairing masonry.
In order to solve the above-mentioned technical problem, the technical scheme adopted by the invention is that:
(1) oyster shell is taken, rinses, polish, crushing and sonic oscillation impregnates, then the oyster shell after dipping being freezed, grinding
And sieving, oyster shell powder is obtained, it is spare；
(2) it takes pumpkin and empties melon pulp and obtain hollow pumpkin, pig manure and tealeaves are mixed and are used as fermentation substrate, then will fermentation
It is injected in hollow pumpkin after substrate and methane liquid mixing, sealed fermenting, after fermentation, filtering removal filter cake obtains fermentation liquid,
It is spare；
(3) grass carp is chipped and takes the flesh of fish, smash into the flesh of fish to pieces fish meat puree, mild fire infusion after fish meat puree and water are mixed is endured
Filtering removal filter residue, obtains filtrate after boiling, and by filtrate concentration, freezing, obtains collagen gel；
(4) above-mentioned collagen gel and moss mixed, crushed, obtain gel trophoplasm, then according to parts by weight, weigh
The spare fermentation of 10~15 parts of gel trophoplasms, 50~60 parts of steps (1) spare oyster shell powder and 100~200 parts of steps (2)
Liquid is sequentially loaded into colloid mill, and discharging obtains grouting material after grinding 1~2h；
(5) grouting material obtained above is fitted into grouting syringe, and masonry to be repaired is injected by syringe and is built
In body, until gap to be repaired injection is full, stand and support to mend sprinkle 200~300mL water daily after injection
The repairing to masonry can be completed in shield after 10~15 days.
The beneficial effects of the present invention are:
The present invention, which splits principle first using ice, immerses moisture in oyster shell gap, forms ice crystal through liquid nitrogen frozen to body
Product increase bursts oyster shell, then it is ground obtain oyster shell powder, later by mixed fermentation be made rich in microorganism fermentation liquid,
Using collagen gel as nutriment, the gap of masonry is injected after fermentation liquid and oyster shell powder and collagen gel are mixed
In, microorganism feeding nutriment is completed to generate carbon dioxide and heat during metabolism, the moisture of sprinkle when maintenance
With in oyster shell calcium carbonate and carbon dioxide reaction generate soluble calcium bicarbonate and immerse inside masonry crack, carbonic acid
Hydrogen calcium re-forms fine and close calcium carbonate crystal under the action of heat, and the gap of masonry is blocked completely, reaches repairing
The purpose of masonry, the calcium carbonate crystal compact structure intensity generated after present invention repairing is high, will not generate shrinkage cracking, and produce
Raw inorganic carbonate calcium ageing resistance is substantially better than organic material, and it is strong that the present invention repairs patching material used in the method for masonry
Degree is high, and for 7 days compression strength up to 20~24MPa, 15 days compression strength is and hard in patching material up to 30~34MPa after repairing
It is not in shrinkage cracking problem during changing.
Specific embodiment
Stock: fresh oyster shell, deionized water, water, pumpkin, pig manure, tealeaves, methane liquid, gauze, fresh grass carp and tongue fur
Moss.
The fresh oyster shell of 1~2kg is weighed, again on the outside of grinder buffing removal oyster shell after being rinsed 3~5 times with deionized water
Oyster shell after polishing is put into 30~40min of crushing in airslide disintegrating mill, by smashed oyster by the impurity layer of 1~2mm thickness
Shell fragment and water are sonic oscillation 3~5h of dipping after 1:5 mixing in mass ratio, take out oyster shell fragment after dipping and use liquid
It is transferred to 20~30min of mortar grinder after 3~5min of nitrogen spray refrigeration, 200 meshes are crossed after grinding, split principle first using ice
It immerses moisture in oyster shell gap, forms ice crystal through liquid nitrogen frozen to which oyster shell is burst in volume increase, then ground obtain
Oyster shell powder takes 10~15 pumpkins, using the muskmelon pedicel of each pumpkin as the center of circle, digs out the circle that a radius is 5cm with punch
Hole, then the melon pulp inside pumpkin is emptied, it obtains hollow pumpkin and uses it as round, take pig manure and tealeaves is in mass ratio
Fermentation substrate is obtained after 3:1 mixing, then fermentation substrate and methane liquid are implanted sequentially 10 after mixing for 1:1 in mass ratio~
Inside 15 hollow pumpkins, until filling inside by pumpkin, pumpkin hole finally is sealed with preservative film, is issued at 30~40 DEG C
Ferment 12~14 days, to after fermentation, pour out the fermentation material in all pumpkins, with three layers of filtered through gauze, separation removal filter cake was obtained
To be rich in microorganism fermentation liquid, take fresh grass carp to chip and take the flesh of fish, the flesh of fish is put into stone mortar, with stone pestle smash to pieces processing 1~
2h, obtains fish meat puree, then by fish meat puree and water is in mass ratio to pour into casserole after 1:5 is mixed, and filters after 1~2h of mild fire infusion
Filter residue is removed, filtrate is obtained, puts the filtrate into and be concentrated into the 1/3 of original volume in concentration tank, obtain concentrate, then concentrate is put
Enter in refrigerator, 10~12h placed at 0~4 DEG C, obtains collagen gel, by obtained collagen gel and moss by etc. matter
Amount crushes 20~30min and obtains gel trophoplasm than being put into tissue pulverizer after mixing, then according to parts by weight, weigh 10~
15 parts of gel trophoplasms, 50~60 parts of oyster shell powders and 100~200 portions of fermentation liquids are sequentially loaded into colloid mill, after grinding 1~2h
Discharging obtains grouting material；Obtained grouting material is fitted into grouting syringe, and masonry to be repaired is injected by syringe and is built
In body, until gap to be repaired injection is full, stand and support to mend sprinkle 200~300mL water daily after injection
Shield 10~15 days injects brick after mixing fermentation liquid and oyster shell powder and collagen gel using collagen gel as nutriment
In the gap of barnacle body, microorganism feeding nutriment is completed to generate carbon dioxide and heat, maintenance during metabolism
When sprinkle moisture and oyster shell in calcium carbonate and carbon dioxide reaction generate soluble calcium bicarbonate and immersion first
Inside masonry crack, calcium bicarbonate re-forms fine and close calcium carbonate crystal under the action of heat, by the gap of masonry
It blocks completely, achievees the purpose that repair masonry, the repairing to masonry can be completed.
Example 1
The fresh oyster shell of 1kg is weighed, it is thick with 1mm on the outside of grinder buffing removal oyster shell again after being rinsed 3 times with deionized water
Impurity layer, the oyster shell after polishing is put into airslide disintegrating mill and crushes 30min, smashed oyster shell fragment and water are pressed
Mass ratio is sonic oscillation dipping 3h after 1:5 mixing, takes out oyster shell fragment after dipping and freezes 3min with liquid nitrogen spraying
After be transferred to mortar grinder 20min, after grinding cross 200 meshes, obtain oyster shell powder, 10 pumpkins taken, with each pumpkin
Muskmelon pedicel is the center of circle, digs out the circular hole that a radius is 5cm with punch, then the melon pulp inside pumpkin is emptied, obtains hollow south
Melon uses it as round, obtains fermentation substrate after taking pig manure and tealeaves in mass ratio and being 3:1 mixing, then be in mass ratio 1:
1 is implanted sequentially fermentation substrate and methane liquid inside 10 hollow pumpkins after mixing, until filling inside by pumpkin,
Pumpkin hole finally is sealed with preservative film, is fermented 12 days at 30 DEG C, to after fermentation, pour out the fermentation material in all pumpkins,
With three layers of filtered through gauze, separation removal filter cake obtains the fermentation liquid rich in microorganism, takes fresh grass carp to chip and take the flesh of fish, by fish
Meat is put into stone mortar, is smashed processing 1h to pieces with stone pestle, is obtained fish meat puree, then by fish meat puree and water is in mass ratio to fall after 1:5 is mixed
Enter in casserole, filtering removal filter residue, obtains filtrate, put the filtrate into and be concentrated into the 1/ of original volume in concentration tank after mild fire infusion 1h
3, concentrate is obtained, then concentrate is put into refrigerator, place 10h at 0 DEG C, obtains collagen gel, the fish glue that will be obtained
Former gel and Bryum uliginosum are put into crushing 20min in tissue pulverizer and obtain gel trophoplasm after mixing by equal mass ratioes, then press
Parts by weight meter weighs 10 parts of gel trophoplasms, 50 parts of oyster shell powders and 100 portions of fermentation liquids and is sequentially loaded into colloid mill, grinding
Discharging obtains grouting material after 1h；Obtained grouting material is fitted into grouting syringe, and injects brick to be repaired by syringe
In barnacle body, until gap to be repaired injection is full, stand and support to mend sprinkle 200mL water daily after injection
Shield 10 days, can be completed the repairing to masonry.
Example 2
The fresh oyster shell of 2kg is weighed, it is thick with 2mm on the outside of grinder buffing removal oyster shell again after being rinsed 4 times with deionized water
Impurity layer, the oyster shell after polishing is put into airslide disintegrating mill and crushes 35min, smashed oyster shell fragment and water are pressed
Mass ratio is sonic oscillation dipping 4h after 1:5 mixing, takes out oyster shell fragment after dipping and freezes 4min with liquid nitrogen spraying
After be transferred to mortar grinder 25min, after grinding cross 200 meshes, obtain oyster shell powder, 13 pumpkins taken, with each pumpkin
Muskmelon pedicel is the center of circle, digs out the circular hole that a radius is 5cm with punch, then the melon pulp inside pumpkin is emptied, obtains hollow south
Melon uses it as round, obtains fermentation substrate after taking pig manure and tealeaves in mass ratio and being 3:1 mixing, then be in mass ratio 1:
1 is implanted sequentially fermentation substrate and methane liquid inside 13 hollow pumpkins after mixing, until filling inside by pumpkin,
Pumpkin hole finally is sealed with preservative film, is fermented 13 days at 35 DEG C, to after fermentation, pour out the fermentation material in all pumpkins,
With three layers of filtered through gauze, separation removal filter cake obtains the fermentation liquid rich in microorganism, takes fresh grass carp to chip and take the flesh of fish, by fish
Meat is put into stone mortar, is smashed processing 2h to pieces with stone pestle, is obtained fish meat puree, then by fish meat puree and water is in mass ratio to fall after 1:5 is mixed
Enter in casserole, filtering removal filter residue, obtains filtrate, put the filtrate into and be concentrated into the 1/ of original volume in concentration tank after mild fire infusion 2h
3, concentrate is obtained, then concentrate is put into refrigerator, place 11h at 2 DEG C, obtains collagen gel, the fish glue that will be obtained
Former gel and the true moss of high mountain are put into crushing 25min in tissue pulverizer and obtain gel trophoplasm after mixing by equal mass ratioes, then press
Parts by weight meter weighs 13 parts of gel trophoplasms, 55 parts of oyster shell powders and 150 portions of fermentation liquids and is sequentially loaded into colloid mill, grinding
Discharging obtains grouting material after 2h；Obtained grouting material is fitted into grouting syringe, and injects brick to be repaired by syringe
In barnacle body, until gap to be repaired injection is full, stand and support to mend sprinkle 250mL water daily after injection
Shield 13 days, can be completed the repairing to masonry.
Example 3
The fresh oyster shell of 2kg is weighed, it is thick with 2mm on the outside of grinder buffing removal oyster shell again after being rinsed 5 times with deionized water
Impurity layer, the oyster shell after polishing is put into airslide disintegrating mill and crushes 40min, smashed oyster shell fragment and water are pressed
Mass ratio is sonic oscillation dipping 5h after 1:5 mixing, takes out oyster shell fragment after dipping and freezes 5min with liquid nitrogen spraying
After be transferred to mortar grinder 30min, after grinding cross 200 meshes, obtain oyster shell powder, 15 pumpkins taken, with each pumpkin
Muskmelon pedicel is the center of circle, digs out the circular hole that a radius is 5cm with punch, then the melon pulp inside pumpkin is emptied, obtains hollow south
Melon uses it as round, obtains fermentation substrate after taking pig manure and tealeaves in mass ratio and being 3:1 mixing, then be in mass ratio 1:
1 is implanted sequentially fermentation substrate and methane liquid inside 15 hollow pumpkins after mixing, until filling inside by pumpkin,
Pumpkin hole finally is sealed with preservative film, is fermented 14 days at 40 DEG C, to after fermentation, pour out the fermentation material in all pumpkins,
With three layers of filtered through gauze, separation removal filter cake obtains the fermentation liquid rich in microorganism, takes fresh grass carp to chip and take the flesh of fish, by fish
Meat is put into stone mortar, is smashed processing 2h to pieces with stone pestle, is obtained fish meat puree, then by fish meat puree and water is in mass ratio to fall after 1:5 is mixed
Enter in casserole, filtering removal filter residue, obtains filtrate, put the filtrate into and be concentrated into the 1/ of original volume in concentration tank after mild fire infusion 2h
3, concentrate is obtained, then concentrate is put into refrigerator, place 12h at 4 DEG C, obtains collagen gel, the fish glue that will be obtained
Former gel and rice-pudding leaf song tail moss are put into crushing 30min in tissue pulverizer and obtain gel trophoplasm after mixing by equal mass ratioes, then
According to parts by weight, 15 parts of gel trophoplasms, 60 parts of oyster shell powders and 200 portions of fermentation liquids are weighed to be sequentially loaded into colloid mill, are ground
Discharging obtains grouting material after mill 2h；Obtained grouting material is fitted into grouting syringe, and is injected by syringe to be repaired
In masonry, until gap to be repaired injection is full, stood daily to mend sprinkle 300mL water after injection
Maintenance 15 days, can be completed the repairing to masonry.
Claims (8)
1. a kind of method using oyster shell and microorganism repairing masonry, it is characterised in that concrete operation step are as follows:
(1) it takes oyster shell, rinses, polishing, crushes and sonic oscillation dipping, then by oyster shell freezing, grinding and the mistake after dipping
Sieve, obtains oyster shell powder, spare；
(2) it takes pumpkin and empties melon pulp and obtain hollow pumpkin, pig manure and tealeaves are mixed and are used as fermentation substrate, then by fermentation substrate
It is injected in hollow pumpkin with after methane liquid mixing, sealed fermenting, after fermentation, filtering removal filter cake obtains fermentation liquid, standby
With；
(3) grass carp is chipped and takes the flesh of fish, smash into the flesh of fish to pieces fish meat puree, mild fire infusion after fish meat puree and water are mixed, after infusion
Filtering removal filter residue, obtains filtrate, by filtrate concentration, freezing, obtains collagen gel；
(4) above-mentioned collagen gel and moss mixed, crushed, obtain gel trophoplasm, then according to parts by weight, weigh 10~
The spare oyster shell powder of 15 parts of gel trophoplasms, 50~60 parts of steps (1) and the spare fermentation liquid of 100~200 parts of steps (2) according to
In secondary loading colloid mill, discharging obtains grouting material after grinding 1~2h；
(5) grouting material obtained above is fitted into grouting syringe, and is injected in masonry to be repaired by syringe,
Until gap to be repaired injection is full, maintenance 10 is stood to mend sprinkle 200~300mL water daily after injection
The repairing to masonry can be completed after~15 days.
2. a kind of method using oyster shell and microorganism repairing masonry according to claim 1, it is characterised in that:
Oyster shell is rinsed in step (1), the concrete operation step of polishing, crushing and sonic oscillation dipping are as follows: take fresh oyster shell, use
Deionized water removes the impurity layer of 1~2mm thickness on the outside of oyster shell with grinder buffing again after rinsing 3~5 times, by the oyster after polishing
Shell is put into 30~40min of crushing in airslide disintegrating mill, is in mass ratio to surpass after 1:5 is mixed by smashed oyster shell fragment and water
Sound oscillation impregnates 3~5h.
3. a kind of method using oyster shell and microorganism repairing masonry according to claim 1, it is characterised in that:
The concrete operation step freeze the oyster shell after dipping in step (1), ground and sieved are as follows: by the oyster shell liquid after dipping
It is transferred to 20~30min of mortar grinder after 3~5min of nitrogen spray refrigeration, 200 meshes are crossed after grinding.
4. a kind of method using oyster shell and microorganism repairing masonry according to claim 1, it is characterised in that:
The preparation step of hollow pumpkin in step (2) are as follows: take pumpkin, using the muskmelon pedicel of pumpkin as the center of circle, dig out a radius with punch
For the circular hole of 5cm, then the melon pulp inside pumpkin emptied, obtains hollow pumpkin.
5. a kind of method using oyster shell and microorganism repairing masonry according to claim 1, it is characterised in that:
The mass ratio of pig manure described in step (2) and tealeaves is 3:1, and the mass ratio of fermentation substrate and methane liquid is 1:1, sealing means
It is to be sealed pumpkin hole with preservative film, fermentation temperature is 30~40 DEG C, and fermentation time is 12~14 days.
6. a kind of method using oyster shell and microorganism repairing masonry according to claim 1, it is characterised in that:
The mass ratio of fish meat puree described in step (3) and water is 1:5, and the infusion time is 1~2h.
7. a kind of method using oyster shell and microorganism repairing masonry according to claim 1, it is characterised in that:
Concentration described in step (3), which refers to put the filtrate into, is concentrated into the 1/3 of its original volume in concentration tank, freezing refers to concentrate
It is put into refrigerator, 10~12h is freezed at 0~4 DEG C.
8. a kind of method using oyster shell and microorganism repairing masonry according to claim 1, it is characterised in that:
Moss described in step (4) includes: spire bog moss, back bracket tongue fur, reaping hook moss, bald leaf bog moss, quasi- sharp leaf bog moss, hang down capsule
The true moss of true moss, high mountain, thin capsule moss, rice-pudding leaf song tail moss, spire song tail moss, the true moss of ovum leaf and one of the knob moss or a variety of that comes into leaves.
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| CN107012856B (en) * | 2017-05-14 | 2019-05-31 | 上海三航奔腾海洋工程有限公司 | A method of utilizing moss stalactite mixing consolidation by grouting sand |
| CN108298906A (en) * | 2018-02-10 | 2018-07-20 | 黄旭东 | A kind of preparation method of permanent seal cooling frost-resistant concrete |
| CN110064479B (en) * | 2019-04-24 | 2023-12-22 | 山东大学 | Experimental device for broken granule size distribution rule of fish excrement and urine |
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| CN1778934A (en) * | 2005-10-10 | 2006-05-31 | 东南大学 | Preparation of calcium carbonate by microbe deposition |
| CN101265130A (en) * | 2008-04-21 | 2008-09-17 | 山东大学威海分校 | Process for preparing kelp holdfast and oyster shell composite biological preparation by microwave technique |
| CN101270369A (en) * | 2008-05-06 | 2008-09-24 | 清华大学 | Microorganism cause concrete or concrete, producing method and application thereof |
| CN101830652A (en) * | 2010-06-11 | 2010-09-15 | 福州大学 | Method for preparing concrete admixture by utilizing oyster shells and applications |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1778934A (en) * | 2005-10-10 | 2006-05-31 | 东南大学 | Preparation of calcium carbonate by microbe deposition |
| CN101265130A (en) * | 2008-04-21 | 2008-09-17 | 山东大学威海分校 | Process for preparing kelp holdfast and oyster shell composite biological preparation by microwave technique |
| CN101270369A (en) * | 2008-05-06 | 2008-09-24 | 清华大学 | Microorganism cause concrete or concrete, producing method and application thereof |
| CN101830652A (en) * | 2010-06-11 | 2010-09-15 | 福州大学 | Method for preparing concrete admixture by utilizing oyster shells and applications |
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