CN109231872A - A kind of early strong concrete pumping admixture of high water reduction high-thin arch dam - Google Patents
A kind of early strong concrete pumping admixture of high water reduction high-thin arch dam Download PDFInfo
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- CN109231872A CN109231872A CN201811115432.1A CN201811115432A CN109231872A CN 109231872 A CN109231872 A CN 109231872A CN 201811115432 A CN201811115432 A CN 201811115432A CN 109231872 A CN109231872 A CN 109231872A
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- early strong
- arch dam
- concrete pumping
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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
Abstract
The invention discloses a kind of early strong concrete pumping admixtures of high water reduction high-thin arch dam, comprise the following components in parts by weight: 10-20 parts of polycarboxylate water-reducer, 5-20 parts of sustained-release water reducing agent, 0.5-5 parts of retarder, 0.1-0.5 parts of air entraining agent, 0.5-3 parts of early strength agent, 52-85 parts of water.The early strong concrete pumping admixture of high water reduction high-thin arch dam of the invention is used in concrete, under conditions of 25 DEG C of summer temperature or more, it is ensured that concrete keeps good mobility in 4 hours, to meet construction requirement；After 4 hours, due to the effect of accelerating component, promote the aquation of cement, to achieve the effect that early strong；After concrete formation, gain in strength is fast, and the demoulding period is short, improves production efficiency.After molding, gain in strength is fast, and the demoulding period is short, improves production efficiency.
Description
Technical field
The present invention relates to cement concrete admixture in a kind of construction material, especially a kind of concrete pump-feed agent.
Background technique
The development of construction material concrete technology is largely determined by the development of additive technology.Concrete skill
It is solved required for the development of the development problem encountered of art, exactly additive.And the main body trend of concrete development at present is
It is durable, energy saving, and environmental protection.With the reach of science, in the use of additive, not only changed the performance of concrete
It is kind, and have significant reduction in cost.Concrete admixture by its act on title and definition such as, water-reducing agent, early strength agent,
Retarder, air entraining agent, swelling agent, antifreezing agent, pumping admixture etc. and the multi-functional additive being combined.In building, especially quotient
Product concrete, almost all use additive.
Construction of high-performance concrete mostly uses greatly pumping technology, and pump concrete requires concrete to have biggish mobility,
And this performance, i.e. little loss of slump are kept in a long time, stickiness is preferable, and concrete does not isolate, not bleeding, to accomplish
This point is only inadequate by adjustment concrete proportioning, it is necessary to rely on concrete admixture, especially pumping admixture.One-component
Additive be difficult to meet requirement of the pump concrete to additive performance, common pumping admixture is the compound production of a variety of additives
Product mainly form as follows: water-reducing agent, retarder, lubricant, air entraining agent, thickener etc..Currently, common concrete pumping
Agent had not only required early strength but also had required slump retaining, and collapse protection type and early-strength are to belong to two verieties, are rushed in performance
It is prominent.The good pumping admixture of slump retaining, the early strength of concrete are low.And the pumping admixture that early strength is high, concrete slump retaining
Often poor, the especially high moisture evaporation of summer temperature is fast, and moisture loss is faster, and concrete slump loss is bigger, concrete
Mobility, cohesiveness etc. are poorer, substantially it cannot be guaranteed that summer is able to satisfy the working performance more than 4 hours.
It solves not only to require to keep works fine in 4 hours, but also there is the problem of early strong demand.There are two types of common at present
Method: (one) pass through use common falling protection type pumping agent, be further added by cement consumption, can meet simultaneously in this way slump retaining and early stage by force
The requirement of degree, but increase cement consumption and not only increased cost but also unfavorable energy-saving and emission-reduction；(2) in mother liquor synthesis phase, pass through introducing
Functional group with blood coagulation enhancing effect, this method complex process, and higher cost.
Summary of the invention
It can make to keep works fine in concrete 4 hours technical problem to be solved by the invention is to provide one kind,
Meet the early strong concrete pumping admixture of the high water reduction high-thin arch dam of early strong demand again.
The technical solution adopted by the present invention to solve the technical problems is: a kind of early strong concrete of high water reduction high-thin arch dam
Pumping admixture comprises the following components in parts by weight:
10-20 parts of polycarboxylate water-reducer, 5-20 parts of sustained-release water reducing agent, 0.5-5 parts of retarder, 0.1-0.5 parts of air entraining agent,
0.5-3 parts of early strength agent, 52-85 parts of water.
Preferably, the polycarboxylate water-reducer solid content is 40%-50%, by isoamyl alcohol polyoxyethylene ether and propylene
Acid copolymerization gained.Polycarboxylate water-reducer is adsorbed in cement particle surface, by the principle of electrostatic repulsion and steric hindrance, reduces mixed
Solidifying soil water consumption improves concrete strength to reduce concrete water-cement ratio.
Preferably, the sustained-release water reducing agent solid content is 40%-50%, by isoamyl alcohol polyoxyethylene ether and propylene
Sour hydroxyl ethyl ester copolymerization gained.It during sustained-release water reducing agent mixed concrete, initially cuts little ice, but prolonging with the time
Long, which slowly releases diminishing component, thus the diminishing component being continuously replenished in concrete system, constantly newly-increased diminishing
Component acts on cement surface, disperses cement granules, the Free water in concrete system is supplemented, to extend the stream of concrete
Dynamic property improves function of slump protection.
Preferably, the retarder is selected from one or more of sodium gluconate, sodium citrate, white sugar.Retarder
Delay the heat evolution velocity of cement, to reach certain guarantor effect of collapsing.
Preferably, the air entraining agent is triterpenoid saponin, lauryl sodium sulfate, neopelex, rosin
It is one or two kinds of in air entraining agent.Air entraining agent increases the air content in concrete system, improves the mobility of concrete.
Preferably, the early strength agent is one of thiosulfate, organic alcohol amine, the poly- hydroxyl hydramine of alkylamine or several
Kind.Early strength agent accelerates the heat evolution velocity of cement in concrete, the aquation after 0.5-3 part of early strength agent is especially pre-hardening in proportion into
Journey.To accelerate concrete strength rate of rise, reach early strong purpose.
Realize concrete internal mobility free of losses in 4 hours, conventional means is a large amount of retarder of addition, but retarder
The additional amount excessive setting time that will affect concrete, early strength of concrete are low.But if a large amount of retarder is added simultaneously
And early strength agent, it cannot achieve the prolonged function of slump protection of concrete or improve early strength of concrete, and in the present invention, mainly
Prolonged function of slump protection is realized by 5-20 parts of sustained-release water reducing agents and the collaboration of 0.5-5 parts of retarder or improves coagulation
Native early strength.In the concrete that early-strength type concrete pump-feed agent is added, sustained-release water reducing agent is in cement slurry
Environment in gradually release diminishing component and adsorbed by cement, since steric hindrance and electrostatic repulsion disperse cement slurry,
Sustained-release water reducing agent can in 4 hours slow release, to guarantee concrete internal mobility free of losses in 4 hours.4 under this proportion
After hour, early strength agent starts to play a leading role, and promotes the aquation of cement, to achieve the effect that early strong.
The beneficial effects of the present invention are: the early strong concrete pumping admixture of high water reduction high-thin arch dam of the invention is used for concrete
In, under conditions of 25 DEG C of summer temperature or more, it is ensured that concrete keeps good mobility in 4 hours, thus full
Sufficient construction requirement；After 4 hours, due to the effect of accelerating component, promote the aquation of cement, to achieve the effect that early strong；It is mixed
After solidifying earth forming, gain in strength is fast, and the demoulding period is short, improves production efficiency.
Specific embodiment
Below with reference to embodiment, the present invention is further described.
The present invention has done following test:
The solid content for the polycarboxylate water-reducer that this test example 1-5 and control group 1-10 is selected is 40%, and selection is delayed
The solid content for releasing type water-reducing agent is 40%；Retarder selects sodium gluconate；Air entraining agent used is triterpenoid saponin；Morning used
Strong agent is sodium thiosulfate.
The solid content for the polycarboxylate water-reducer that embodiment 6-11 and control group are selected is 50%, the sustained-release water reducing agent of selection
Solid content be 50%；Retarder selects sodium citrate；Air entraining agent used is lauryl sodium sulfate；Early strength agent used is
Triethanolamine.Table 1 is the weight proportion of embodiment 1-11 and control group 1-10.
The weight proportion of table 1 embodiment 1-11 and control group 1-10
| Component | Polycarboxylate water-reducer | Sustained-release water reducing agent | Retarder | Air entraining agent | Early strength agent | Water |
| Embodiment 1 | 15Kg | 5Kg | 3Kg | 0.3Kg | 2Kg | 60Kg |
| Embodiment 2 | 15Kg | 15Kg | 3Kg | 0.3Kg | 2Kg | 60Kg |
| Embodiment 3 | 15Kg | 20Kg | 3Kg | 0.3Kg | 2Kg | 60Kg |
| Control group 1 | 15Kg | 25Kg | 3Kg | 0.3Kg | 2Kg | 60Kg |
| Control group 2 | 15Kg | 3Kg | 3Kg | 0.3Kg | 2Kg | 60Kg |
| Embodiment 4 | 15Kg | 15Kg | 3Kg | 0.3Kg | 0.5Kg | 60Kg |
| Embodiment 5 | 15Kg | 15Kg | 3Kg | 0.3Kg | 3Kg | 60Kg |
| Control group 3 | 15Kg | 15Kg | 3Kg | 0.3Kg | 0.2Kg | 60Kg |
| Control group 4 | 15Kg | 15Kg | 3Kg | 0.3Kg | 5Kg | 60Kg |
| Embodiment 6 | 10Kg | 15Kg | 3K | 0.3Kg | 2Kg | 60Kg |
| Embodiment 7 | 20Kg | 15Kg | 3K | 0.3Kg | 2Kg | 60Kg |
| Control group 5 | 5Kg | 15Kg | 3K | 0.3Kg | 2Kg | 60Kg |
| Control group 6 | 25Kg | 15Kg | 3K | 0.3Kg | 2Kg | 60Kg |
| Embodiment 8 | 15Kg | 15Kg | 0.5Kg | 0.3Kg | 2Kg | 60Kg |
| Embodiment 9 | 15Kg | 15Kg | 5Kg | 0.3Kg | 2Kg | 60Kg |
| Control group 7 | 15Kg | 15Kg | 0.2Kg | 0.3Kg | 2Kg | 60Kg |
| Control group 8 | 15Kg | 15Kg | 8Kg | 0.3Kg | 2Kg | 60Kg |
| Embodiment 10 | 15Kg | 15Kg | 3Kg | 0.1Kg | 2Kg | 60Kg |
| Embodiment 11 | 15Kg | 15Kg | 3Kg | 0.5Kg | 2Kg | 60Kg |
| Control group 9 | 15Kg | 15Kg | 3Kg | 0.05Kg | 2Kg | 60Kg |
| Control group 10 | 15Kg | 15Kg | 3Kg | 0.8Kg | 2Kg | 60Kg |
According to the material preparation of table 1, stirring obtains early strong concrete pumping admixture after twenty minutes, at 25 DEG C of summer high temperature or more
Environment in, the concrete for being C30 by the early strong concrete pumping admixture of preparation incorporation strength grade, additional amount is in concrete
The 1.8% of cementitious material quality, is then tested for the property, specific as shown in table 2.
The performance test after concrete is added in concrete pump-feed agent made from table 2 embodiment 1-11 and control group 1-10
As can be seen from Table 2, the resulting early strong concrete pumping admixture incorporation concrete of embodiment 1-11 carries out performance survey
Examination, obtain the slump in concrete 4 hours be 180mm-240mm, divergence 400mm-600mm, have works fine；
It can be demoulded after 12-18 hours, 3 days intensity is 37Mpa up to 26.5Mpa or more, 28 days intensity up to 20Mpa or more, 7 days intensity
Left and right；It can be seen that the proportion when each component of early strong concrete pumping admixture not in the present patent application from control group 1-10
When ratio range or concrete slump retaining is poor, substantially it cannot be guaranteed that summer is able to satisfy the working performance more than 4 hours,
Concrete strength is unable to reach design requirement.
Claims (6)
1. a kind of early strong concrete pumping admixture of high water reduction high-thin arch dam, which is characterized in that comprise the following components in parts by weight:
10-20 parts of polycarboxylate water-reducer,
5-20 parts of sustained-release water reducing agent,
0.5-5 parts of retarder,
0.1-0.5 parts of air entraining agent,
0.5-3 parts of early strength agent,
52-85 parts of water.
2. a kind of early strong concrete pumping admixture of high water reduction high-thin arch dam according to claim 1, which is characterized in that described
Polycarboxylate water-reducer solid content be 40%-50%, obtained by isoamyl alcohol polyoxyethylene ether and acrylic acid copolymer.
3. a kind of early strong concrete pumping admixture of high water reduction high-thin arch dam according to claim 1, which is characterized in that described
Sustained-release water reducing agent solid content be 40%-50%, by isoamyl alcohol polyoxyethylene ether and hydroxy-ethyl acrylate copolymerization gained.
4. a kind of early strong concrete pumping admixture of high water reduction high-thin arch dam according to claim 1, which is characterized in that described
Retarder be selected from one or more of sodium gluconate, sodium citrate, white sugar.
5. a kind of early strong concrete pumping admixture of high water reduction high-thin arch dam according to claim 1, which is characterized in that described
Air entraining agent be triterpenoid saponin, it is lauryl sodium sulfate, neopelex, one or two kinds of in rosin air entraining agent.
6. a kind of early strong concrete pumping admixture of high water reduction high-thin arch dam according to claim 1, which is characterized in that described
Early strength agent be one or more of thiosulfate, organic alcohol amine, the poly- hydroxyl hydramine of alkylamine.
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| CN201811115432.1A CN109231872A (en) | 2018-09-25 | 2018-09-25 | A kind of early strong concrete pumping admixture of high water reduction high-thin arch dam |
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| CN201811115432.1A CN109231872A (en) | 2018-09-25 | 2018-09-25 | A kind of early strong concrete pumping admixture of high water reduction high-thin arch dam |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111978004A (en) * | 2020-07-09 | 2020-11-24 | 浙江五龙新材股份有限公司 | Polycarboxylic acid type efficient pumping agent and application thereof |
| CN112125559A (en) * | 2020-09-09 | 2020-12-25 | 安徽海螺新材料科技有限公司 | Super early strength concrete additive and preparation method thereof |
| CN113264707A (en) * | 2021-06-08 | 2021-08-17 | 山东华伟银凯建材科技股份有限公司 | High-performance concrete water reducing agent and preparation method thereof |
| CN113896448A (en) * | 2021-11-25 | 2022-01-07 | 十九冶成都建设有限公司 | Additive for ultra-large volume concrete |
| CN113955972A (en) * | 2021-12-08 | 2022-01-21 | 眉山海螺新材料科技有限公司 | Seventy-two-hour ultra-retarding polycarboxylic acid pumping aid and preparation method thereof |
| CN115849787A (en) * | 2022-12-26 | 2023-03-28 | 马鞍山国运混凝土有限公司 | Production process of premixed concrete |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111978004A (en) * | 2020-07-09 | 2020-11-24 | 浙江五龙新材股份有限公司 | Polycarboxylic acid type efficient pumping agent and application thereof |
| CN112125559A (en) * | 2020-09-09 | 2020-12-25 | 安徽海螺新材料科技有限公司 | Super early strength concrete additive and preparation method thereof |
| CN112125559B (en) * | 2020-09-09 | 2022-05-20 | 安徽海螺新材料科技有限公司 | Super early strength type concrete additive and preparation method thereof |
| CN113264707A (en) * | 2021-06-08 | 2021-08-17 | 山东华伟银凯建材科技股份有限公司 | High-performance concrete water reducing agent and preparation method thereof |
| CN113896448A (en) * | 2021-11-25 | 2022-01-07 | 十九冶成都建设有限公司 | Additive for ultra-large volume concrete |
| CN113955972A (en) * | 2021-12-08 | 2022-01-21 | 眉山海螺新材料科技有限公司 | Seventy-two-hour ultra-retarding polycarboxylic acid pumping aid and preparation method thereof |
| CN115849787A (en) * | 2022-12-26 | 2023-03-28 | 马鞍山国运混凝土有限公司 | Production process of premixed concrete |
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Application publication date: 20190118 |