CN102173629A - Volume stabilizer of cement-based materials and application method thereof - Google Patents
Volume stabilizer of cement-based materials and application method thereof Download PDFInfo
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- CN102173629A CN102173629A CN 201110026838 CN201110026838A CN102173629A CN 102173629 A CN102173629 A CN 102173629A CN 201110026838 CN201110026838 CN 201110026838 CN 201110026838 A CN201110026838 A CN 201110026838A CN 102173629 A CN102173629 A CN 102173629A
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/302—Water reducers
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- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
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- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a volume stabilizer of cement-based materials and an application method thereof. The volume stabilizer is the mixture of a shrinking/reducing-type slump-retaining agent and an expanding agent or an internal curing agent. The components are as follows (by mass percent): 30 to 60 percent of shrinking/reducing-type slump-retaining agent, 0 to 70 percent of expanding agent and 0 to 70 percent of internal curing agent. The produced volume stabilizer is added to cement concrete with an addition amount of 6% to 8% of the weight of cementing materials, can increase the internal relative humidity and the cement hydration degree of hardened cement paste, reduce the time-dependent loss of slump of fresh concrete and compensate or reduce the shrinkage of cement-based materials, can be used in combination with high-efficiency water-reducing agents and high-performance water-reducing agents, can endow concrete with excellent working performances and cracking resistance, and is applied to self-compacting concrete, high-volume mineral admixture concrete, low water-binder ratio concrete and concrete with strict requirements for low shrinkage.
Description
Technical field
The invention belongs to the Materials Science and Engineering field, be specifically related to the volume stabilizer and the using method thereof of cement-based material.
Background technology
Concrete volume stability is the key property that influences the functional and weather resistance of concrete structure, and distress in concrete is a most thorny issue that influences volume stability of concrete, therefore becomes the problem that many scholars and engineering staff are concerned about always and study.Concrete produces reasons of cracks and mainly contains load factor and non-load factor, for the load factor mainly is unreasonable causing on the structure design, standard has provided the fissured method of more sophisticated control to the building of different grades at present, can effectively avoid because the crack that the load factor causes; And be that characteristics by concrete itself cause for the crack that non-load factor produces, mainly be in the inside concrete reaction process or because the effect of temperature produces and shrinks the formation crack, and dominant position is occupied in non-load crack in distress in concrete.Development in recent years is high performance concrete (HPC) faster, because its water cement ratio is little, mixes the active mineral admixture, and the early hydration process is accelerated, and causes internal relative humidity to descend rapidly, self-desiccation takes place shrink, and this has more strengthened the possibility of concrete cracking.So control concrete contraction is the key that solves crack problem.
The minimizing concrete shrinkage of using on the engineering, the fissured main method of control have at present: the control starting material comprise cement and adulterant; Strengthen maintenance; Mix admixture.Preceding two kinds of methods are to control fissured important method at present because the restriction of condition all has its limitation so mix admixture.Using maximum admixtures now is swelling agent, has been widely used in building construction, hydro project, underground works etc., and country has formulated corresponding standard at swelling agent, the use of standard swelling agent.Swelling agent can be divided three classes: calcium sulphoaluminate class cement expansive material, calcium oxide cement expansive material and calcium sulphoaluminate-calcium oxide cement expansive material.
The expansion sources of calcium oxide cement expansive material is a calcium hydroxide, calcium oxide in the swelling agent and water reaction generate calcium hydroxide, volume almost increases and is twice before and after the reaction, but the calcium oxide cement expansive material is very responsive for ambient conditionss such as temperature, humidity, restive, production and duration of service can not be too of a specified duration at interval, and the quality guaranteed period is shorter, so the calcium oxide cement expansive material uses and to have limitation and unstable, be calcium sulphoaluminate class cement expansive material so use maximum.
The expansion sources of calcium sulphoaluminate class cement expansive material all is that ettringite or ettringite are crystal, sulfate ion in the swelling agent, aluminum ion and concrete hydrating product calcium hydroxide and water reaction generate the ettringite crystal, can produce volumetric expansion during reaction, thereby compensating concrete shrinks, and reaches the effect of cracking resistance.Calcium sulphoaluminate class cement expansive material has low price, but storage time is long, characteristics such as stable performance.But the moisture in the reaction process meeting consume water slurry body of swelling agent in concrete, contain 32 crystal water in the ettringite molecule, if the insufficient inside concrete relative humidity that will cause of maintenance reduces rapidly, increase the self-desiccation effect, produce self-constriction, when the crack then appears during greater than concrete tensile stress in string stress, this moment, swelling agent not only can not play the cracking resistance effect, had quickened fissured generation on the contrary.This problem is for the low water-cement ratio concrete and to mix active mineral admixture concrete particularly remarkable.Therefore, the use of common swelling agent requires very high for curing condition, in use often can not bring into play its expansion cracking resistance effect, even can bring negative influence.
Summary of the invention
The object of the present invention is to provide and a kind ofly improve volume stability of concrete, effectively prevent the volume stabilizer and the using method thereof of concrete cracking, the present invention has overcome the method for existing raising volume stability of concrete, some shortcomings of swelling agent particularly, can reduce concrete shrinkage under various conditions, effectively reduce the possibility of concrete cracking, can improve the internal relative humidity and the hydrated cementitious degree of petrifying water mudstone, the slump that reduces fresh concrete through the time lose compensation or reduce the contraction of cement-based material.
Technical scheme of the present invention is: a kind of volume stabilizer of cement-based material, be the mixture of one or both compositions in shrinkage type slump retaining agent and swelling agent or the interior curing agent, and each components in mass portion is counted:
Shrinkage type slump retaining agent 30%～60%
Interior curing agent is 0～70%
Described swelling agent is any one in calcium sulphoaluminate class cement expansive material, calcium oxide cement expansive material, magnesium oxide concrete swelling agent, iron powder series concrete swelling agent or the composite expanding agent.
Curing agent is curing agent or a natural suction mineral material in the artificial synthesizing inorganic in described.
Curing agent was for to prepare according to the method in the patent of invention of Chinese patent ZL200710192002.5 in described synthetic was inorganic.
Described natural suction mineral material is any one in wilkinite, active attapulgite soil and the active coal spoil, perhaps is in sodium bentonite, calcium-base bentonite and the modified product thereof any one.
Described active coal spoil is a self-igniting coal gangue, in 600 ℃～800 ℃ calcination processing, levigate to specific surface area 200m
2～400m
2
Using the method for the volume stabilizer of described cement-based material, is that volume stabilizer is mixed in the cement concrete by 6%～8% of gelling material weight in the cement concrete.
Perhaps with volume stabilizer and water reducer according to 1～20: the composite use of 1 ratio is mixed in the cement concrete.
Described water reducer is any one in naphthalene series high-efficiency water-reducing agent, sulfamate based water reducer, aliphatics based water reducer, maleic acid type polycarboxylate water-reducer or the acrylic acid series high efficiency water reducing agent.
Volume stabilizer of the present invention is applicable to self-compacting concrete, big volume mineral admixture concrete, low water binder ratio concrete and low contraction is had the concrete of strict demand.
Beneficial effect:
1, volume stabilizer of the present invention can be united compensating concrete and be shunk, and significantly improves crack-resistant performance of concrete, the shrinkage type slump retaining agent except that having the effect of reducing, the slump that can also reduce fresh concrete through the time lose, improve the workability of fresh concrete; Interior curing agent can provide the moisture that needs in the swelling agent reaction process, make swelling agent give full play to its expansion effect, in addition, itself also can reduce concrete self-constriction interior curing agent, improve concrete volume stability, can also improve the internal relative humidity and the hydrated cementitious degree of petrifying water mudstone; If use with high efficiency water reducing agent or high-performance water reducing agent compatibility, more can give good workability of concrete and resistance to cleavage.So the present invention is than conventional art better effects if.
2, generally speaking, higher when using swelling agent to concrete curing requirements, generally need water seasoning, and curing time is longer, be unfavorable for construction, and some position is difficult to carry out sufficient outside maintenance.For high performance concrete, because water cement ratio is lower, concrete is fine and close especially, and outside water supply is difficult to infiltrate inside concrete.For this situation, use swelling agent often not only can not play compensate for shrinkage, reduce the rimose purpose, even might strengthen the possibility of concrete cracking.The interior curing agent that contains in the volume stabilizer of the present invention can provide swelling agent to react required moisture, and is self-sufficient, reduces the dependency of concrete for outer maintenance, and widely applicable, use range is big.
When 3, using general admixture to reduce concrete shrinkage; when improving volume stability of concrete; usually can cause the fresh concrete slump through time loss; reduce concrete workability; particularly for the commerical ready-mixed concrete and the pump concrete that generally use now, the slump through the time loss meeting construction is caused very big inconvenience.Volume stabilizer of the present invention contains the shrinkage type slump retaining agent, and certain effect of reducing is not only arranged, can also effectively reduce fresh concrete through time loss, be convenient to concrete construction.
4, the interior curing agent in the volume stabilizer of the present invention is except that providing swelling agent to react the required moisture, remaining moisture can also play interior maintenance action, reduces the effect of concrete self-desiccation, reduces self-constriction, increase the early stage extent of hydration of cement slurry, improve concrete intensity.
5, in the raw material of volume stabilizer of the present invention, use the industrial waste coal gangue, be applied in the concrete, realize the utilization once more of dead meal, turn waste into wealth, reduced production cost, have good benefits in environment through after the activation treatment.
Description of drawings
Fig. 1 is high performance concrete circle ring test result.
Fig. 2 is self-compacting concrete shrinkage test result.
Embodiment
Material therefor is all commercially available.
Be all mass parts below the preparation method of embodiment 1, volume stabilizer.
(1) take by weighing 50 parts of shrinkage type concrete slump retaining agents by quality, 50 parts of calcium sulphoaluminate type cement expansive materials mix in the pneumatic blending machine and get final product.
(2) take by weighing 50 parts of shrinkage type concrete slump retaining agents by quality, 50 parts of sodium bentonites mix in the pneumatic blending machine and get product.
(3) take by weighing 40 parts of shrinkage type concrete slump retaining agents by quality, 30 parts of calcium sulphoaluminate type cement expansive materials, 30 parts of sodium bentonites mix in stirrer and get final product.
(4) take by weighing 40 parts of concrete slump retaining agents by quality, take by weighing 60 parts of the interior curing agents described in the patent of invention of Chinese patent ZL200710192002.5, mix and get final product.
(5) take by weighing 30 parts of concrete slump retaining agents by quality, 30 parts of calcium sulphoaluminate type cement expansive materials, 50 parts in active attapulgite soil mixes stand-by in the pneumatic blending machine.
(6) take by weighing 40 parts of concrete slump retaining agents by quality, 30 parts of magnesium oxide concrete swelling agents, 30 parts of wilkinites mix and both get finished product.
(7) with the industrial waste coal gangue under the state of nature through 600 ℃～800 ℃ calcination processing, then through the jaw crusher coarse crushing, again through ball mill levigate to specific surface area be 200m
2/ kg～400m
2/ kg.Take by weighing 40 parts of concrete slump retaining agents by quality then, 60 parts of the active coal gangues that the process aforesaid method was handled get final product after the pneumatic blending machine mixes.
(8) with the industrial waste coal gangue under the state of nature through 600 ℃～800 ℃ calcination processing, then through the jaw crusher coarse crushing, again through ball mill levigate to specific surface area be 200m
2/ kg～400m
2/ kg.Take by weighing 30 parts of concrete slump retaining agents by quality then, 30 parts of calcium sulphoaluminate type cement expansive materials, 40 parts of the coal gangues of handling through aforesaid method, after mixing both finished product.
(9) with the industrial waste coal gangue under the state of nature through 600 ℃～800 ℃ calcination processing, then through the jaw crusher coarse crushing, again through ball mill levigate to specific surface area be 200m
2/ kg～400m
2/ kg.Take by weighing 30 parts of concrete slump retaining agents, 40 parts of calcium oxide cement expansive materials take by weighing 30 parts of coal gangues after the activated processing, after in the pneumatic blending machine, mixing then both finished product.
The using method of embodiment 2, volume stabilizer
(1) application in high performance concrete
The proportioning of high performance concrete sees Table 1.Adopt 0.3 low water-cement ratio, select the cement of PII52.5 for use, contents of ground slag is set in 50%, adopts medium sand, and fineness mould degree is 2.6, and cobble-stone diameter is 5～10mm.Wherein first group is blank test, and its excess-three group is mixed the volume stabilizer of different components respectively, contrasts actual effect of the present invention and each other quality, and the volume of volume stabilizer is etc. that quality replaces 8% of gelling material.In addition, in order to reach better effect, volume stabilizer of the present invention and polycarboxylic acids water reducing agent compositional are used.
Wherein, volume stabilizer consists of in first group of concrete: shrinkage type concrete slump retaining agent 50%, calcium sulphoaluminate type coagulation
Table 1 concrete mix
Soil expansion agent 50%; Volume stabilizer consists of in second group of concrete: shrinkage type concrete slump retaining agent 50%, sodium bentonite 50%; Volume stabilizer consists of in the 3rd group of concrete: shrinkage type concrete slump retaining agent 40%, calcium sulphoaluminate type cement expansive material 30%, sodium bentonite 30%.
Behind table 1 configuration high performance concrete, according to ASTM C1581 standard " Standard Test Method for Determining Age at Cracking and Induced Tensile Stress Characteristics of
The concrete ultimate compression strength of table 2
As can be seen from Figure 1: the blank group of not mixing volume stabilizer just ftractureed at the 4th day, the 1st group of cracking in the 18th day, and the 2nd group of cracking in 16 days, and the 3rd group all not have to ftracture in 28 days.As seen, three kinds of concrete volume stable agent have significant effect to the volume stability that improves high performance concrete, can effectively reduce the crack on concrete tendency.Comparatively speaking, the 1st group suitable substantially with the 2nd group of effect, and the 3rd group resistance to cleavage is best.
As can be found from Table 2: the adding of volume stabilizer of the present invention can improve concrete early hydration degree, can increase the compaction rate of inside concrete, improves concrete ultimate compression strength.
(2) application in the low water binder ratio concrete
Concrete mix sees Table 3.Adopt 0.36 low water binder ratio, select the cement of PII52.5 for use, adopt medium sand, fineness mould degree is 2.6, and cobble-stone diameter is 5～20mm.Wherein first group is blank test, and its excess-three group is mixed the volume stabilizer of different components respectively, contrasts actual effect of the present invention and each other quality, and the volume of volume stabilizer is etc. that quality replaces 8% of gelling material.In addition, in order to reach better effect, mix 1.6kg naphthalene series high-efficiency water-reducing agent (water ratio 5%) in 1 cubic meter of concrete.
Table 3 concrete mix
Wherein, volume stabilizer consists of in first group of concrete: shrinkage type concrete slump retaining agent 40%, calcium sulphoaluminate type cement expansive material 60%; Volume stabilizer consists of in second group of concrete: shrinkage type concrete slump retaining agent 40%, active coal spoil 60%; Volume stabilizer consists of in the 3rd group of concrete: shrinkage type concrete slump retaining agent 30%, calcium sulphoaluminate type cement expansive material 30%, active coal spoil 40%.
Adopt flat band method to test concrete early-age plastic shrinkage, the results are shown in Table 4.
Table 4 concrete cracking performance test result
As shown in Table 4, volume stabilizer of the present invention has very big restraining effect for the concrete early-age plastic shrinkage of low water-cement ratio, and crack-resistant performance of concrete gets a promotion.The blank group of not mixing volume stabilizer ftractures early, and the crack is more, fracture width and length are all bigger, unit crack area is bigger, mix three groups of fracture widths of volume stabilizer and do not compare not obviously minimizing with the blank group with length, but the crack number obviously lacks than the blank group, and the unit area of cracks is corresponding also less.
(3) application of the present invention in self-compacting concrete
The self-compacting concrete proportioning sees Table 5.Adopt 0.41 water-cement ratio, select the cement of PII52.5 for use, adopt medium sand, fineness mould degree is 2.6, and cobble-stone diameter 5～10mm accounts for 30%, 10～15mm and accounts for 30%, 15～20mm and account for 40%.First group is blank test, the volume of volume stabilizer be etc. quality replace gelling material 7%.Consisting of of volume stabilizer: 40 parts of concrete slump retaining agents, 30 parts of magnesium oxide concrete swelling agents, 30 parts of sodium bentonites.In order to obtain than high fluidity and to reduce the fresh concrete slump-loss, 1 cubic meter of concrete is mixed 8.4kg polycarboxylate water-reducer (solid content is 20%).
Table 5 concrete mix
Test according to GBJ82-85 " Standard for test methods of longterm performance and durability of ordinary concrete ", test the shrinking percentage of two groups of self-compacting concretes, the result as shown in Figure 2.
As can be seen from Figure 2, the blank contraction rate and the shrinkage of organizing of self-compacting concrete ratio of mixing volume stabilizer is all little, and mixes this group no longer continuation contraction basically later at 28 days of volume stabilizer, and the blank trend that continues contraction that still has of organizing.So volume stabilizer of the present invention can effectively improve the resistance to cleavage of self-compacting concrete.
Claims (9)
1. the volume stabilizer of a cement-based material, it is characterized in that: be the mixture of one or both compositions in shrinkage type slump retaining agent and swelling agent or the interior curing agent, each component is by mass percentage:
Shrinkage type slump retaining agent 30%～60%
Swelling agent 0～70%
Interior curing agent is 0～70%.
2. the volume stabilizer of cement-based material as claimed in claim 1, it is characterized in that described swelling agent is any one in calcium sulphoaluminate class cement expansive material, calcium oxide cement expansive material, magnesium oxide concrete swelling agent, iron powder series concrete swelling agent or the composite expanding agent.
3. the volume stabilizer of cement-based material as claimed in claim 1 is characterized in that, described interior curing agent is curing agent or a natural suction mineral material in the artificial synthesizing inorganic.
4. the volume stabilizer of cement-based material as claimed in claim 3 is characterized in that, curing agent was for to prepare according to the method in the patent of invention of Chinese patent ZL200710192002.5 in described synthetic was inorganic.
5. the volume stabilizer of cement-based material as claimed in claim 3, it is characterized in that, described natural suction mineral material is any one in wilkinite, active attapulgite soil and the active coal spoil, perhaps is in sodium bentonite, calcium-base bentonite and the modified product thereof any one.
6. the volume stabilizer of cement-based material as claimed in claim 5 is characterized in that, described active coal spoil is a self-igniting coal gangue, in 600 ℃～800 ℃ calcination processing, levigate to specific surface area 200m
2～400m
2
7. use the method for the volume stabilizer of the arbitrary described cement-based material of claim 1 ~ 6, it is characterized in that, volume stabilizer is mixed in the cement concrete by 6%～8% of gelling material weight in the cement concrete.
8. the method for the volume stabilizer of use cement-based material as claimed in claim 7 is characterized in that, with volume stabilizer and water reducer according to the composite use of the ratio of 1 ~ 20:1.
9. the method for the volume stabilizer of use cement-based material as claimed in claim 8, it is characterized in that described water reducer is any one in naphthalene series high-efficiency water-reducing agent, sulfamate based water reducer, aliphatics based water reducer, maleic acid type polycarboxylate water-reducer or the acrylic acid series high efficiency water reducing agent.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102942373A (en) * | 2012-11-17 | 2013-02-27 | 河南省耕生耐火材料有限公司 | Volume stabilizing agent for fire-resistant and plastic material |
| CN104446117A (en) * | 2014-11-18 | 2015-03-25 | 桂林华越环保科技有限公司 | Concrete expansion agent |
| EP3106446A1 (en) * | 2015-06-18 | 2016-12-21 | Eidgenössische Materialprüfungs- und Forschungsanstalt EMPA | Self-prestressed reinforced concrete elements |
| CN106542786A (en) * | 2016-10-08 | 2017-03-29 | 深圳海龙建筑科技有限公司 | Self-curing concrete and its production method |
| CN108147689A (en) * | 2017-12-31 | 2018-06-12 | 江苏申御特种建材有限公司 | A kind of magnesia antimitotic agent of graphene oxide and preparation method thereof |
| CN113213807A (en) * | 2021-05-29 | 2021-08-06 | 石家庄市长安育才建材有限公司 | Composite anti-cracking agent for ultra-long large-volume concrete and preparation method thereof |
| CN114213053A (en) * | 2021-12-02 | 2022-03-22 | 同济大学 | Additive for reducing drying shrinkage of concrete, preparation method and use method thereof |
| CN115043625A (en) * | 2022-06-23 | 2022-09-13 | 潍坊纵横建材有限公司 | Porous high-expansion ceramic sand anti-cracking agent for concrete and preparation method thereof |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102942373A (en) * | 2012-11-17 | 2013-02-27 | 河南省耕生耐火材料有限公司 | Volume stabilizing agent for fire-resistant and plastic material |
| CN104446117A (en) * | 2014-11-18 | 2015-03-25 | 桂林华越环保科技有限公司 | Concrete expansion agent |
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| US10604449B2 (en) | 2015-06-18 | 2020-03-31 | Empa Eidgenössische Materialprüfungs- Und Forschungsanstalt | Self-prestressed reinforced concrete elements |
| EP3106446A1 (en) * | 2015-06-18 | 2016-12-21 | Eidgenössische Materialprüfungs- und Forschungsanstalt EMPA | Self-prestressed reinforced concrete elements |
| WO2016201587A1 (en) * | 2015-06-18 | 2016-12-22 | Empa Eidgenössische Material-Prüfungs Und Forschungsanstalt | Self-prestressed reinforced concrete elements |
| CN106542786A (en) * | 2016-10-08 | 2017-03-29 | 深圳海龙建筑科技有限公司 | Self-curing concrete and its production method |
| CN108147689A (en) * | 2017-12-31 | 2018-06-12 | 江苏申御特种建材有限公司 | A kind of magnesia antimitotic agent of graphene oxide and preparation method thereof |
| CN113213807A (en) * | 2021-05-29 | 2021-08-06 | 石家庄市长安育才建材有限公司 | Composite anti-cracking agent for ultra-long large-volume concrete and preparation method thereof |
| CN113213807B (en) * | 2021-05-29 | 2022-08-30 | 石家庄市长安育才建材有限公司 | Composite anti-cracking agent for ultra-long large-volume concrete and preparation method thereof |
| CN114213053A (en) * | 2021-12-02 | 2022-03-22 | 同济大学 | Additive for reducing drying shrinkage of concrete, preparation method and use method thereof |
| CN115043625A (en) * | 2022-06-23 | 2022-09-13 | 潍坊纵横建材有限公司 | Porous high-expansion ceramic sand anti-cracking agent for concrete and preparation method thereof |
| CN115043625B (en) * | 2022-06-23 | 2023-09-05 | 潍坊纵横建材有限公司 | Porous high-expansion ceramic sand crack resistant agent for concrete and preparation method thereof |
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Application publication date: 20110907 |