CN1193953C - Additive for prestirred self-compacting concrete - Google Patents
Additive for prestirred self-compacting concrete Download PDFInfo
- Publication number
- CN1193953C CN1193953C CNB021361967A CN02136196A CN1193953C CN 1193953 C CN1193953 C CN 1193953C CN B021361967 A CNB021361967 A CN B021361967A CN 02136196 A CN02136196 A CN 02136196A CN 1193953 C CN1193953 C CN 1193953C
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- Prior art keywords
- self
- water reducing
- concrete
- efficiency
- reducing agent
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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
-
- 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
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00103—Self-compacting mixtures
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The present invention relates to a pre-stirred self-compacting additive for concrete, which belongs to the field of a building material. The present invention has the specific contents: (1) a composite high-efficiency concrete additive which uses a polyocarboxy acid series condensation product as a separation resisting component, sodium tripolyphosphate as a plastic keeping component and high-efficiency naphthalene water reducing agent as a base material is adopted; (2) the mixed amount of the polyocarboxy acid series condensation product is 4 to 7% of that of the high-efficiency naphthalene water reducing agent; (3) the mixed amount of the sodium tripolyphosphate is 0.4 to 0.8% of that of the high-efficiency naphthalene water reducing agent; (4) the naphthalene water reducing agent is compounded by two high-efficiency naphthalenesulfonate formaldehyde condensation product water reducing agents of which the condensed degrees are different and the water reducing rates are larger than 25%, and the ratio of the two high-efficiency water reducing agents is 1:1. The present invention has the characteristics of higher water reducing rate and separation resistance; furthermore, the passing capacity of steel bar clearance of self-compacting concrete is enhanced, the reduction of the separation resistance of the pre-stirred self-compacting concrete in the conveying process can be prevented or reduced, and the self-compacting concrete can well adapt to the technological conditions of mass production.
Description
Technical field: what the present invention relates to is a kind of concrete admixture, and particularly a kind of additive for prestirred self-compacting concrete belongs to building material field.
Background technology: concrete is the main raw of modern project structure, about 1 billion cubic meter of the annual concrete amount of China, scale is big, expensive, can predict, Steel Concrete will be China at a kind of important engineering material in quite over a long time from now on, and material is the basis, Development of Materials will be to method of design, operating technique, experimental technique so that the maintenance management decisive role of skeleton construction.Usually, concrete mix is not runny, during pouring construction, need to adopt the method for vibrating to overcome the interior shearing stress of mixture, make it liquefaction, to reach the purpose of moulding and cast, shake in case occur leaking, will make concrete structure loose and the incomplete defective of profile occur, therefore concrete pouring construction labour intensity is big, and the noise that produces because of vibrating, have a strong impact on orthobiosis and work, for addressing this problem, having to adopt increases unit consumption of water or adds high efficiency water reducing agent with bigger volume, to reach required high workability; Also have when adding high efficiency water reducing agent to add viscosity modifier, but can prolong concrete coagulating time or reduce concrete strength with general cellulose modified thing.In recent years, people's self-compacting concrete that begins one's study, self-compacting concrete and mixture have very high flowability and do not emanate, not bleeding, can be without vibrating or vibrating less levelling and be full of model and the concrete of parcel reinforcing bar automatically.The self-compacting concrete comprehensive benefit is remarkable, especially for the position that is difficult to pour into a mould even can't pour into a mould, can avoid occurring to reduce labour intensity because of mass defects such as cavity that undervibration causes, honeycomb, pitted skins, save labour, vibrate facility and energy consumption, reduce the construction work total expenses.The key of self-compacting concrete preparation is to satisfy the required rheological property requirement of self-compacting concrete, and the self-compacting concrete additive can improve concrete flowability.Through the prior art literature search being found Chinese patent application number is: 96109805, name is called: exempt from the autodensing concrete almixture that shakes, this patent application readme: a kind of self-compactable concrete blend needing vibrating, contain cement, water, aggregate, high efficiency water reducing agent, it is characterized in that: contain phenols negatively charged ion condenses in the high efficiency water reducing agent.This phenols negatively charged ion condenses has higher water-reducing rate, trickling to the self-compacting fresh concrete has promoter action, but there is no education resistance characteristic, the loss of prestirred self-compacting concrete workability in transportation of being mixed with a certain amount of silicate adulterant is not played any control action kou.
Summary of the invention and embodiment: the present invention is directed to the deficiencies in the prior art and defective, a kind of additive for prestirred self-compacting concrete is provided, make its trickling that improves the self-compacting fresh concrete, and have education resistance characteristic.The present invention is based on prestirred self-compacting concrete workability loss mechanism in transportation, be that prestirred self-compacting concrete loss of workability in transportation is to cause the decline of prestirred self-compacting concrete reinforcing bar gap trafficability characteristic and filling capacity owing to mortar and rough aggregate interface cohesiveness descend, determine that the self-compacting concrete admixture need have following three conditions: one, high water reducing rate; Two, has certain education resistance characteristic, to improve self-compacting concrete reinforcing bar gap handling capacity; Three, can prevent or reduce the decline of prestirred self-compacting concrete education resistance in transportation, according to above-mentioned requirements, particular content of the present invention is:
(1), adopt poly carboxylic acid series condenses as anti-educing component, tripoly phosphate sodium STPP as plasticizing component, naphthalene series high-efficiency water-reducing agent composite efficient concrete admixture as base-material;
(2), the incorporation of poly carboxylic acid series condenses is 4%～7% of a naphthalene series high-efficiency water-reducing agent;
(3), the incorporation of tripoly phosphate sodium STPP is 0.4%～0.8% of a naphthalene series high-efficiency water-reducing agent;
(4), naphthalene series high-efficiency water-reducing agent be the variant and water-reducing rate of two kinds of condensation degrees all greater than 25% composite the forming of naphthalenesulfonate formaldehyde condensation compound high efficiency water reducing agent, the ratio of these two kinds of high efficiency water reducing agents is 1: 1.
The present invention has substantive distinguishing features and marked improvement, the present invention has than high water reducing rate, has education resistance characteristic simultaneously, thereby improved self-compacting concrete reinforcing bar gap handling capacity, and can prevent or reduce the decline of prestirred self-compacting concrete education resistance in transportation, make self-compacting concrete can adapt to the processing condition of big production preferably.
Provide three embodiment below in conjunction with summary of the invention and embodiment:
Example one: suitablely mix that the control that education resistance can descend in transportation has obvious good effect to prestirred self-compacting concrete with the admixture prescription that adds poly carboxylic acid series condenses and with what the data results that the TL-2 instrument records characterized poly carboxylic acid series condenses:
| Sequence number | The two-pack naphthalene water reducer | Poly carboxylic acid series condenses | The result who records with the TL-2 instrument | |||||
| New mixed concrete performance when going out machine | Mix car running new mixed concrete performance after 30 minutes | |||||||
| t 40(second) | T (mm) | L (mm) | t 40(second) | T (mm) | L (mm) | |||
| 1 | 1 | --- | 8 | 220 | 1080 | 8 | 190 | 1100 |
| 2 | 1 | 0.04 | 7 | 245 | 1310 | 4 | 240 | 1200 |
| 3 | 1 | 0.06 | 13 | 250 | 1240 | 15 | 250 | 1310 |
| 4 | 1 | 0.07 | 12 | 240 | 1130 | 9 | 250 | 1260 |
Annotate: the admixture prescription of (1) sequence number 1,2,3,4 all is added with 0.004 tripoly phosphate sodium STPP plasticity-retention agent in addition.
(2) in this table the TL-2 instrument to record the result be admixture formulating of recipe target to reach T 〉=240mm.
(3) listed ratio all refers to weight ratio in the table, down together.
When not mixing poly carboxylic acid series condenses by example one presentation of results, fresh concrete reinforcing bar gap through performance was better when prestirred self-compacting concrete went out machine, but mixing the car transportation after 30 minutes, reinforcing bar gap through performance descends (sequence number 1:T value is reduced to 190mm by former 220mm), characterizes its workability loss and fails to be effectively controlled; Yet after mixing the poly carboxylic acid series condenses of sufficient quantity, reinforcing bar gap trafficability characteristic is good when going out machine newly mixes self-compacting concrete, still had reinforcing bar gap trafficability characteristic (sequence number 2,3,4) preferably later in 30 minutes mixing car running, and the suitable volume of poly carboxylic acid series condenses is 4%～7% of a naphthalene water reducer.
Example two: self-compacting concrete reinforcing bar gap trafficability characteristic is had obvious good effect with the admixture prescription that adds tripoly phosphate sodium STPP and with suitable the mixing that the data results that the TL-2 instrument records characterizes tripoly phosphate sodium STPP:
| Sequence number | The two-pack naphthalene water reducer | Tripoly phosphate sodium STPP | The result who records with the TL-2 instrument | ||
| t 40(second) | T (mm) | L(mm) | |||
| 1 | 1 | -- | 19 | 215 | 960 |
| 2 | 1 | 0.002 | 10 | 230 | 1190 |
| 3 | 1 | 0.004 | 10 | 240 | 1175 |
| 4 | 1 | 0.006 | 10 | 245 | 1180 |
| 5 | 1 | 0.008 | 12 | 240 | 1180 |
When not mixing tripoly phosphate sodium STPP by example two presentation of results self-compacting fresh concrete reinforcing bar gap trafficability characteristic relatively poor (sequence number 1, T=215mm); And when mixing tripoly phosphate sodium STPP, self-compacting fresh concrete reinforcing bar gap trafficability characteristic increases (sequence number 2,3,4,5), and the suitable volume of tripoly phosphate sodium STPP is 0.4%～0.8% (sequence number 3,4,5) of naphthalene water reducer.
Example three: with the admixture prescription of two kinds of naphthalene water reducer different ratioss and with two kinds of naphthalene water reducer ratios of data results sign that the TL-2 instrument records is 1: 1 o'clock, and self-compacting concrete reinforcing bar gap through performance is good
(sequence number 3):
| Sequence number | The ratio of two kinds of naphthalene water reducers | The result who records with the TL-2 instrument | |||
| Naphthalene is A | Naphthalene is B | t 40(second) | T(mm) | L(mm) | |
| 1 | 0 | 1.0 | -- | 85 | 340 |
| 2 | 0.3 | 0.7 | -- | 140 | 570 |
| 3 | 0.5 | 0.5 | -- | 225 | 730 |
| 4 | 0.7 | 0.3 | -- | 180 | 600 |
| 5 | 1.0 | 0 | -- | 98 | 380 |
Claims (1)
1, a kind of additive for prestirred self-compacting concrete is characterized in that, particular content is:
(1), the weight percent incorporation of poly carboxylic acid condenses is 4%～7% of a naphthalene water reducer;
(2), the weight percent incorporation of tripoly phosphate sodium STPP is 0.4%～0.8% of a naphthalene water reducer;
(3), naphthalene series high-efficiency water-reducing agent be the variant and water-reducing rate of two kinds of condensation degrees all greater than 25% composite the forming of naphthalenesulfonate formaldehyde condensation compound high efficiency water reducing agent, the ratio of these two kinds of water reducers is 1: 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021361967A CN1193953C (en) | 2002-07-25 | 2002-07-25 | Additive for prestirred self-compacting concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021361967A CN1193953C (en) | 2002-07-25 | 2002-07-25 | Additive for prestirred self-compacting concrete |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1390799A CN1390799A (en) | 2003-01-15 |
| CN1193953C true CN1193953C (en) | 2005-03-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021361967A Expired - Fee Related CN1193953C (en) | 2002-07-25 | 2002-07-25 | Additive for prestirred self-compacting concrete |
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| Country | Link |
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| CN (1) | CN1193953C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100336767C (en) * | 2006-06-01 | 2007-09-12 | 同济大学 | Self compacting high strength mortar |
| CN100336765C (en) * | 2006-05-11 | 2007-09-12 | 同济大学 | Self-compacted concrete of resisting erosion of sulfate and its preparing method |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101333091B (en) * | 2007-06-25 | 2013-01-02 | 深圳市海川实业股份有限公司 | Method for preparing high-efficiency water-reducing agent of poly-carboxylic acid |
| CN104529371A (en) * | 2014-11-26 | 2015-04-22 | 王新荣 | Anticorrosive mortar and preparation method thereof |
| CN104496255B (en) * | 2014-11-28 | 2017-01-18 | 苏笮斌 | Mineral interface active material, and preparation method and application method thereof |
-
2002
- 2002-07-25 CN CNB021361967A patent/CN1193953C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100336765C (en) * | 2006-05-11 | 2007-09-12 | 同济大学 | Self-compacted concrete of resisting erosion of sulfate and its preparing method |
| CN100336767C (en) * | 2006-06-01 | 2007-09-12 | 同济大学 | Self compacting high strength mortar |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1390799A (en) | 2003-01-15 |
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