CN101265047B - Reducing agent specially used for chips concrete - Google Patents
Reducing agent specially used for chips concrete Download PDFInfo
- Publication number
- CN101265047B CN101265047B CN2008100239252A CN200810023925A CN101265047B CN 101265047 B CN101265047 B CN 101265047B CN 2008100239252 A CN2008100239252 A CN 2008100239252A CN 200810023925 A CN200810023925 A CN 200810023925A CN 101265047 B CN101265047 B CN 101265047B
- Authority
- CN
- China
- Prior art keywords
- concrete
- reducing agent
- shrinkage
- chips
- agent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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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
-
- 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
-
- 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
- C04B2111/34—Non-shrinking or non-cracking materials
Abstract
The invention discloses a shrinkage-reducing agent used for stone chip concrete, which is made from the following raw materials according to mass percentage as follows: an expanding agent 73-91%, a naphthalene-based superplasticizer 8-15%, a polyalcohol 0.5-3%, a surfactant 0-0.5%, and a polyhydroxylated compound 0-8%. In order to solve the problem that stone chip concrete has high shrinkage rateduring the engineering application, the concrete is incorporated with the inventive shrinkage-reducing agent, accounting for 6-8% of the total weight of the binder, so as to efficiently control and reduce the dry shrinkage of concrete without changing the workability, cohesiveness and pumpability of concrete or the required construction technical conditions. Tests prove that the inventive shrinkage-reducing agent can reduce the shrinkage rate of stone chip concrete by more than 30% under the same conditions.
Description
Technical field
The present invention relates to a kind of economization agent that is used for chips concrete, belong to the concrete technology field.
Background technology
Concrete is formulated according to certain mixed by gelling material, fine aggregate, coarse aggregate, water and admixture.Natural sand as fine aggregate is an indispensable part in the concrete.Current China is in the peak period of engineering construction, the demand of building sand increases gradually, and China's natural sand distribution of resource is very inhomogeneous, some local natural sand resources are difficult to satisfy the needs of engineering construction, add the Changjiang river and progressively implement to forbid adopting sand, make the problem of natural sand shortage of resources become increasingly conspicuous.
In addition, natural sand is a kind of region resource, is not suitable for long-distance transportation.For some large-scale water-control projects, be generally located at remotely, have inconvenient traffic, because quantities is bigger, near natural sand resource often is difficult to satisfy the needs of engineering construction, and is from other places fortune sand difficulty relatively again, also uneconomical.Along with the growing and farmland of fundamental construction, the progressively reinforcement of river course environment sfgd.; the situation that the natural sand resource gradually reduces, quality descends day by day and market value goes up has at double appearred in the many areas of China, and then causes concrete more outstanding with the sand imbalance between supply and demand.
In addition, because the unordered production of natural sand and also can cause pollution to air and environment in production, storage and transportation, the State Council and the various places People's Government have taked a series of measure of control in succession and have put into effect to prohibit and adopted or limit the regulation of adopting natural sand for this reason.Can not continue the immoderate collection situation as the natural sand of Mineral resources, natural sand no longer is inexhaustible, nexhaustible resource again.
The aggregate chips particle diameter is generally less than 5mm.It derives from the tankage that the stone quarry is produced in the rubble recovery process.According to statistics, every production 100m
3Rubble will produce 20～30m
3Aggregate chips.It contains the stone flour (particle diameter is less than the particle of 0.16mm) of some amount usually.Compare with natural sand, aggregate chips has that quality is hard, the surface irregularity porous, sharp corners is arranged, characteristics such as adhesive property is good, price is low (have only about 1/3 of natural sand, even lower).In addition, a large amount of aggregate chips that pile up in the stone quarry are land occupation not only, also can bring serious environmental to pollute, so both promoting the use of of aggregate chips brings economic benefit to construction unit, also can reduce environmental pollution to the stone quarry, also reduce underproof river sand and entered construction market, helped improving construction engineering quality.Therefore replace natural sand not only can solve the problem of natural sand shortage of resources with aggregate chips, and have remarkable economic efficiency and social benefit.
Though the good economy performance of aggregate chips, broad market prospect, but some achievements in research also show: owing to contain a certain proportion of stone flour in the aggregate chips, under equal conditions the more common natural sand concrete of (same water cement ratio) shrinking percentage is big for the concrete of preparing with aggregate chips replacement natural sand.In order to solve this technical barrier, the present invention makes the shrinking percentage of chips concrete obtain descending by add a kind of economization agent in chips concrete, reduces the crack on concrete probability, thereby provides technical support for applying of chips concrete.
Summary of the invention
The purpose of this invention is to provide a kind of economization agent that is specifically designed to chips concrete.The problem that the shrinking percentage that occurs in the engineering application process at chips concrete is bigger, in concrete, mix the economization agent of the present invention that accounts for binder total amount 6%～8%, can be under the operating technique condition that guarantees concrete workability and cohesiveness, pumpability or guarantee requiring, effectively control and reduce concrete dry shrinkage.
The economization agent prescription that is used for chips concrete involved in the present invention is:
Swelling agent: 74～91%
Polycarboxylic acid series high efficiency water reducing agent, naphthalene series high-efficiency water-reducing agent or efficient retarding and water reducing agent: 8%～15%
Polyvalent alcohol: 0.5～3%
Tensio-active agent: 0～0.5%
Polyol: 0～8%
When using, the present invention can equivalent replace gelling material.The present invention is used for chips concrete, can effectively reduce the dry shrinkage of chips concrete.Test shows: with under the condition, the present invention is used for chips concrete and can reduces its drying shrinkage and reach more than 30%.
Embodiment
Below the present invention is described in further detail by specific embodiment:
Chips concrete economization agent of the present invention not only can be applied to normal concrete and also can use and roller compacted concrete.Concrete embodiment is as follows:
Example 1. is used for the high slump normal concrete.Certain C 30 pump concrete proportioning and performance index see Table 1.
Table 1
Wherein the economization agent prescription is:
Swelling agent: 75%
Naphthalene series high-efficiency water-reducing agent: 8%
Polyvalent alcohol: 1%
Tensio-active agent: 0.1%
Polyol: 5.9%
In order to simplify, some nouns in the table 1 replace with symbol.Wherein symbol C represents cement, and F represents flyash, and S represents fine aggregate (being aggregate chips herein), and G represents coarse aggregate, and W represents water.Wherein cement is the P.O42.5 level; Flyash is II level ash; The aggregate chips fineness modulus is 2.6; Content of stone powder is 16.9%; Ballast grain sizes is 5～25mm, continuous grading; Pumping agent is a polycarboxylate high performance water-reducing agent.Above-mentioned chips concrete is 1 slump that 18.5cm is as a child still arranged, and workability is good, can satisfy the requirement of pumping construction fully; The dry shrinking percentage of 180d concrete has reduced 31.7%.
Example 2. is used for little slump normal concrete.Certain C40 concrete prefabricated element proportioning and performance index see Table 2.
Table 2
Wherein the economization agent prescription is:
Swelling agent: 82.5%
Naphthalene series high-efficiency water-reducing agent: 13%
Polyvalent alcohol: 0.5%
Tensio-active agent: 0.05%
Polyol: 3.95%
Cement is the P.O42.5 level; The aggregate chips fineness modulus is 2.8, and content of stone powder is 19.3%; The fineness modulus of natural sand is 2.7; The gravelstone particle diameter is 5～10mm, and middle stone particle diameter is 10～31.5mm; Water reducer is a naphthalene series high-efficiency water-reducing agent.For the chips concrete of the little slump, its workability, cohesiveness are good, can satisfy the making requirement of concrete prefabricated element; Its 180d drying shrinkage has also reduced 30.0%.
Example 3. is used for roller compacted concrete.Certain C
18025 roller compacted concrete proportionings and performance index see Table 3.
Table 3
Wherein the economization agent prescription is:
Swelling agent: 84.35%
Naphthalene series high-efficiency water-reducing agent: 8%
Polyvalent alcohol: 2.5%
Tensio-active agent: 0.15%
Polyol: 5%
Cement is the P.MH42.5 level; Flyash is II level ash; The artificial sand fineness modulus is 2.5, and content of stone powder is 10.5%; The gravelstone particle diameter is 5～20mm, and middle stone particle diameter is 20～40mm; Water reducer is an efficient retarding and water reducing agent.Chips concrete mixture stone roller property is good, can satisfy the site operation requirement fully.Its 180d drying shrinkage has also reduced 34.9%.
Though the present invention with preferred embodiment openly as above; but they are not to be used for limiting the present invention; anyly have the knack of this skill person; without departing from the spirit and scope of the invention; from when can doing various variations or retouching, so being as the criterion of should being defined with the application's claim protection domain of protection scope of the present invention.
Claims (2)
1. economization agent that is used for chips concrete, it is to be made by the raw material of following mass percent:
Swelling agent: 74～91%
High efficiency water reducing agent: 8%～15%
Polyvalent alcohol: 0.5～3%
Tensio-active agent: 0～0.5%
Polyol: 0～8%
2. the economization agent that is used for chips concrete according to claim 1 is characterized in that:
Described high efficiency water reducing agent is polycarboxylic acid series high efficiency water reducing agent, naphthalene series high-efficiency water-reducing agent or efficient retarding and water reducing agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100239252A CN101265047B (en) | 2008-04-22 | 2008-04-22 | Reducing agent specially used for chips concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100239252A CN101265047B (en) | 2008-04-22 | 2008-04-22 | Reducing agent specially used for chips concrete |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101265047A CN101265047A (en) | 2008-09-17 |
| CN101265047B true CN101265047B (en) | 2010-08-11 |
Family
ID=39987771
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100239252A Expired - Fee Related CN101265047B (en) | 2008-04-22 | 2008-04-22 | Reducing agent specially used for chips concrete |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101265047B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103342498B (en) * | 2013-07-10 | 2014-10-01 | 南京瑞迪高新技术有限公司 | Liquid plasticity expanding agent special for CA (Cellulose Acetate) mortar and preparation method thereof |
| CN110845654B (en) * | 2019-11-18 | 2021-08-10 | 江苏博思通新材料有限公司 | Preparation method of polyhydroxy air-entraining type retarder for concrete |
| CN111333364A (en) * | 2020-03-11 | 2020-06-26 | 刘翠芬 | Mortar and concrete anti-permeability agent |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5604273A (en) * | 1995-09-18 | 1997-02-18 | W. R. Grace & Co.-Conn. | Drying shrinkage cement admixture |
| JP2001163653A (en) * | 1999-12-06 | 2001-06-19 | Asahi Denka Kogyo Kk | Shrinkage reducing agent for cement or the like |
| JP2003171155A (en) * | 2001-12-03 | 2003-06-17 | Lion Corp | Drying shrinkage-reducing agent for cement |
| CN1583648A (en) * | 2004-05-28 | 2005-02-23 | 哈尔滨工业大学 | Concrete reducing agent |
| CN1702087A (en) * | 2005-06-21 | 2005-11-30 | 重庆大学 | Polyacrylic acid salts shrinkage-reducing-agent and method for making same |
| CN101062849A (en) * | 2007-05-08 | 2007-10-31 | 陈智丰 | Low-alkalinity composite cracking-against waterproof agent |
-
2008
- 2008-04-22 CN CN2008100239252A patent/CN101265047B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5604273A (en) * | 1995-09-18 | 1997-02-18 | W. R. Grace & Co.-Conn. | Drying shrinkage cement admixture |
| JP2001163653A (en) * | 1999-12-06 | 2001-06-19 | Asahi Denka Kogyo Kk | Shrinkage reducing agent for cement or the like |
| JP2003171155A (en) * | 2001-12-03 | 2003-06-17 | Lion Corp | Drying shrinkage-reducing agent for cement |
| CN1583648A (en) * | 2004-05-28 | 2005-02-23 | 哈尔滨工业大学 | Concrete reducing agent |
| CN1702087A (en) * | 2005-06-21 | 2005-11-30 | 重庆大学 | Polyacrylic acid salts shrinkage-reducing-agent and method for making same |
| CN101062849A (en) * | 2007-05-08 | 2007-10-31 | 陈智丰 | Low-alkalinity composite cracking-against waterproof agent |
Non-Patent Citations (1)
| Title |
|---|
| 王吉良等.混凝土减缩剂的研制与性能研究.《低温建筑技术》.2007,(第3期),全文. * |
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| CN101265047A (en) | 2008-09-17 |
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Owner name: NANJING R + D HIGH TECHNOLOGY CO., LTD. Free format text: FORMER NAME: NANJING RUIDI HIGH-TECH CORPORATION |
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Address after: 210012 Yuhuatai District, Jiangsu City, Nanjing Province Patentee after: Nanjing R&D High Technology Co. Address before: 210029 Guangzhou Road, Jiangsu, China, No. 223, No. Patentee before: Nanjing R&D High Technology Co., Ltd. |
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Granted publication date: 20100811 Termination date: 20200422 |