CN104944824A - Cement concrete early strength agent and early strength and water reduction agent - Google Patents

Cement concrete early strength agent and early strength and water reduction agent Download PDF

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Publication number
CN104944824A
CN104944824A CN201510410195.1A CN201510410195A CN104944824A CN 104944824 A CN104944824 A CN 104944824A CN 201510410195 A CN201510410195 A CN 201510410195A CN 104944824 A CN104944824 A CN 104944824A
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early strength
cement concrete
agent
hardening accelerator
parts
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CN201510410195.1A
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CN104944824B (en
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王冲
刘俊超
张聪
李宗阳
尹道道
白光
于超
张超
周莹
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Guizhou Hua Shuo source Greenway Technology Materials Co
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Chongqing University
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Abstract

The invention relates to a cement concrete early strength agent. The cement concrete early strength agent contains nano calcium carbonate and light calcium powder. Preferably, the cement concrete early strength agent further contains calcium formate and one or more kinds of calcium nitrate. The cement concrete early strength agent comprises, by mass, 20-67 parts of nano calcium carbonate, 33-80 parts of light calcium powder, 0-10 parts of calcium formate and 0-10 parts of calcium nitrate. Compared with an existing early strength agent, the cement concrete early strength agent has the most outstanding advantages that no harmful ions are introduced, the use environment is prevented from being polluted, and the cement concrete early strength agent is nontoxic and harmless; in addition, cement concrete early strength can be improved, and the primary solidification time and final solidification time of cement concrete are shortened. The invention further relates to an early strength and water reduction agent containing the cement concrete early strength agent. The early strength and water reduction agent comprises, by mass, 60%-75% of early strength components and 25%-40% of water reducing components. The early strength and water reduction agent has a good early strength function, a good water reduction function and a good strengthening function, the water reduction rate is high, the early strength of concrete can be remarkably improved, and later strength is not affected.

Description

A kind of cement concrete hardening accelerator and early strength water-reducing agent
Technical field
The invention belongs to building material technical field, relate to a kind of cement concrete hardening accelerator and early strength water-reducing agent.
Background technology
Concrete early strength agent refers to the admixture that can improve early age strength of concrete, adopt when many construction or rush repair in the winter time, the concrete early strength agent that current China comparatively commonly uses mainly contains villaumite system, vitriol system, carbonate system, organic system, mineral substance and complex accelerator, and the most frequently used several classes mainly comprise:
(1) chloride salt hardening accelerator: mainly contain calcium chloride, sodium-chlor, Repone K, amine oxide, ferric oxide, aluminum oxide etc., chloride salt hardening accelerator all has good early strength function, wherein calcium chloride is early effective and cost is low by force, most widely used.
(2) Sulfates hardening accelerator: mainly contain sodium sulfate (i.e. Sodium sulfate anhydrous.min(99)), Sulfothiorine, calcium sulfate, Tai-Ace S 150, potassium aluminium sulfate etc.Wherein sodium sulfate application is more.
(3) organism class hardening accelerator: organic amine hardening accelerator mainly contains trolamine (being called for short TEA), tri-isopropanolamine (being called for short T P), diethanolamine etc., and wherein early potent fruit is good with trolamine.
In engineering, above a few class hardening accelerator can singly be mixed or composite.Villaumite system hardening accelerator has obvious action of rust to reinforcing bar, and therefore the application of chlorination system hardening accelerator is little.Also owing to causing concrete " scum ", and there is alkali-aggregate reaction harm risk in vitriol system hardening accelerator, its application is also very restricted.Some other kind hardening accelerator, or there is early strong poor effect, or affect later strength, or there are raw material sources, difficulty produces high in cost of production problem.
Building material technical field is necessary develop the hardening accelerator kind that makes new advances to avoid defect existing in prior art.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of cement concrete hardening accelerator, this hardening accelerator can improve the early strength of cement concrete, does not reduce later strength, and not containing harmful ion, can not increase and alkali-aggregate reaction and steel bar corrosion harm occur; Another object of the present invention is to provide a kind of early strength water-reducing agent being Main Components with this hardening accelerator, this early strength water-reducing agent has well early strong, diminishing, enhancement, and water-reducing rate is large, can significantly improve concrete early stage and later strength.
For achieving the above object, the invention provides following technical scheme:
A kind of cement concrete hardening accelerator, described hardening accelerator contains nano-calcium carbonate and light calcium carbonate powder.
Preferably, described hardening accelerator is also containing one or both in calcium formiate, nitrocalcite.
Preferably, in described hardening accelerator each component and mass fraction as follows:
Preferably, in described hardening accelerator each component and mass fraction as follows:
Nano-calcium carbonate 62 parts;
Light calcium carbonate powder 33 parts;
Calcium formiate 5 parts.
A kind of early strength water-reducing agent, described early strength water-reducing agent contains described cement concrete hardening accelerator.
Preferably, in described early strength water-reducing agent each component and mass percent as follows:
Accelerating component 60% ~ 75%;
Diminishing component 25% ~ 40%.
Described diminishing component is naphthalene water reducer or poly carboxylic acid series water reducer.
Its principle of early strength that nano-calcium carbonate can improve cement concrete has following several respects: first, nano-calcium carbonate can play the effect that superfine gathers materials, the space around filling concrete clinker particles, makes structure become more closely knit thus improves intensity; Secondly, due to the surface effects of nanoparticle, hydrated calcium silicate gel can take nano-calcium carbonate as nucleus growth, thus hydrated calcium silicate gel can be made to be that core develops into reticulated structure with nano-calcium carbonate, make cement concrete inside more closely knit, thus improve intensity; Again, nano-calcium carbonate obviously can reduce Ca (OH) 2dense distribution in interface and aligning, contributes to the over-all properties improving interface; Finally, nano-calcium carbonate can promote C 3a and gypsum react and generate ettringite, and ettringite reacts Formed calcium aluminate again with nano-calcium carbonate be also one of reason of improving of early strength.In accelerating component, introduce light calcium carbonate powder then can improve the compaction rate of cement concrete further thus the early strength of raising cement concrete.
Beneficial effect of the present invention is: not containing some harmful ions in prior art hardening accelerator in hardening accelerator component disclosed in this invention, avoid hardening accelerator of the prior art to the action of rust of reinforcing bar or cause concrete " scum effect ", and cement concrete early strength can be improved by hardening accelerator disclosed in this invention, shorten concrete initial set and final setting time, improve operating efficiency, and compared to classification hardening accelerator various in prior art its early epistasis can not weaken.
Embodiment
Below the preferred embodiments of the present invention are described in detail.
Embodiment 1
A kind of hardening accelerator, its component and mass fraction are: nano-calcium carbonate 62 parts; Light calcium carbonate powder 33 parts; Calcium formiate 5 parts.
Mixed by above-mentioned each component and mass fraction, and keep dry, by hardening accelerator and water mixing, then be added in cement concrete, in the hardening accelerator added and cement concrete, the mass ratio of cement is 1:100.
Embodiment 2
A kind of hardening accelerator, its component and mass fraction are: nano-calcium carbonate 48 parts; Light calcium carbonate powder 48 parts; 4 parts, nitrocalcite.
Mixed by above-mentioned each component and mass fraction, and keep dry, by hardening accelerator and water mixing, then be added in cement concrete, in the hardening accelerator added and cement concrete, the mass ratio of cement is 1:100.
Embodiment 3
A kind of hardening accelerator, its component and mass fraction are: nano-calcium carbonate 32 parts; Light calcium carbonate powder 65 parts; 3 parts, nitrocalcite.
Mixed by above-mentioned each component and mass fraction, and keep dry, by hardening accelerator and water mixing, then be added in cement concrete, in the hardening accelerator added and cement concrete, the mass ratio of cement is 1:100.
Embodiment 4
A kind of early strength water-reducing agent, its component and mass percent are: nano-calcium carbonate 31%; Light calcium carbonate powder 32%; Calcium formiate 4%; Polycarboxylic acid series high efficiency water reducing agent 33%.
Above-mentioned each component is weighed by mass percentage, this hardening accelerator accelerating component is dispersed in the aqueous solution containing polycarboxylic acid series high efficiency water reducing agent, stir, add in cement concrete, in the early strength water-reducing agent added and cement concrete, the mass ratio of cement is 1.5:100.
Embodiment 5
A kind of early strength water-reducing agent, its component and mass percent are: nano-calcium carbonate 30%; Light calcium carbonate powder 30%; Calcium formiate 4%; Nitrocalcite 3%; Polycarboxylic acid series high efficiency water reducing agent 33%.
Above-mentioned each component is weighed by mass percentage, this hardening accelerator accelerating component is dispersed in the aqueous solution containing naphthalene series high-efficiency water-reducing agent, stir, add in cement concrete, in the early strength water-reducing agent added and cement concrete, the mass ratio of cement is 1.5:100.
Embodiment 6
A kind of early strength water-reducing agent, its component and mass percent are: nano-calcium carbonate 33%; Light calcium carbonate powder 33%; Polycarboxylic acid series high efficiency water reducing agent 34%.
Above-mentioned each component is weighed by mass percentage, this hardening accelerator accelerating component is dispersed in the aqueous solution containing polycarboxylic acid series high efficiency water reducing agent, stir, add in cement concrete, in the early strength water-reducing agent added and cement concrete, the mass ratio of cement is 1.5:100.
The mass ratio of above-mentioned coagulating cement water in soil and cement is 0.3, by embodiment 4,5, the sand-cement slurry containing early strength water-reducing agent obtained by 6, cement mortar strength is tested according to GB/T 17671-1999, blank representative does not mix hardening accelerator, and contrasts with one group that mixes calcium chloride, and observed value is as following table 1:
The comparative test result of cement mortar strength tested by table 1
As can be seen from Table 1, adopt embodiment 4,5,6 prepare early strength water-reducing agent with adopt of the prior art contain calcium chloride group early strength water-reducing agent the 1 day length of time attainable concrete bending and compressive strength substantially identical, 3 days, 7 days, the 28 day length of time time, embodiment 4,5, the early strength water-reducing agent effect that the early strength water-reducing agent attainable agent on crack resistance of concrete folding compressive strength rate of 6 preparations contains calcium chloride group also will be got well, and contrasts with blank group, and its effect is more obvious.This illustrates in hardening accelerator component disclosed in this invention and not only avoid containing some harmful ions in prior art hardening accelerator to the action of rust of reinforcing bar or cause concrete " scum effect ", and cement concrete early strength can be improved by hardening accelerator disclosed in this invention, shorten concrete initial set and final setting time, improve operating efficiency, and compared to hardening accelerator in prior art its early epistasis can not weaken and have better effect on the contrary.
What finally illustrate is, above preferred embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although by above preferred embodiment to invention has been detailed description, but those skilled in the art are to be understood that, various change can be made to it in the form and details, and not depart from claims of the present invention limited range.

Claims (7)

1. a cement concrete hardening accelerator, is characterized in that: described hardening accelerator contains nano-calcium carbonate and light calcium carbonate powder.
2. cement concrete hardening accelerator according to claim 1, is characterized in that, described hardening accelerator is also containing one or both in calcium formiate, nitrocalcite.
3. cement concrete hardening accelerator according to claim 2, is characterized in that: in described hardening accelerator each component and mass fraction as follows:
Nano-calcium carbonate 20 ~ 67 parts;
Light calcium carbonate powder 33 ~ 80 parts;
Calcium formiate 0 ~ 10 part;
0 ~ 10 part, nitrocalcite.
4. cement concrete hardening accelerator according to claim 3, is characterized in that: in described hardening accelerator each component and mass fraction as follows:
Nano-calcium carbonate 62 parts;
Light calcium carbonate powder 33 parts;
Calcium formiate 5 parts.
5. an early strength water-reducing agent, is characterized in that: described early strength water-reducing agent contains cement concrete hardening accelerator described in any one of Claims 1 to 4.
6. early strength water-reducing agent according to claim 5, is characterized in that: in described early strength water-reducing agent each component and mass percent as follows:
Accelerating component 60% ~ 75%;
Diminishing component 25% ~ 40%.
7. early strength water-reducing agent according to claim 6, is characterized in that: described diminishing component is naphthalene water reducer or poly carboxylic acid series water reducer.
CN201510410195.1A 2015-07-10 2015-07-10 A kind of cement concrete early strength agent and early strength water-reducing agent Active CN104944824B (en)

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105503020A (en) * 2015-12-30 2016-04-20 卓达新材料科技集团威海股份有限公司 Early strength agent used for ordinary Portland cement fiberboards
CN106116217A (en) * 2016-06-24 2016-11-16 桂林华越环保科技有限公司 A kind of concrete light wall panel early strength water-reducing agent
CN107555829A (en) * 2017-08-14 2018-01-09 山西格瑞特建筑科技股份有限公司 A kind of nucleus type for concrete promotees solidifying early strength agent and preparation method thereof
CN107601953A (en) * 2017-10-30 2018-01-19 兰新良 A kind of cement products early strength agent
CN107673650A (en) * 2017-10-30 2018-02-09 兰新良 A kind of concrete hollow block early strength agent
CN107840591A (en) * 2017-12-01 2018-03-27 北京怡居建筑科技有限公司 A kind of novel cement concrete and its application in construction wall
CN108249845A (en) * 2017-12-13 2018-07-06 镇江建科建设科技有限公司 A kind of Organic-inorganic composite early strength agent and the self-compacting concrete prepared using the early strength agent
CN109250979A (en) * 2018-08-21 2019-01-22 苏州混凝土水泥制品研究院有限公司 It is a kind of for the composition of super high-early concrete prefabricated component and its super high-early concrete prefabricated component of preparation
CN109250941A (en) * 2018-09-07 2019-01-22 青岛颢天绿色建筑科技有限公司 A kind of regenerated aggregate concrete specific complex additive
CN109485291A (en) * 2019-01-07 2019-03-19 山西佳维新材料股份有限公司 A kind of early diminishing complexing agent and preparation method thereof by force of novel poly-carboxylic high-performance nanometer seed crystal
CN110683785A (en) * 2019-11-14 2020-01-14 江苏博思通新材料有限公司 Concrete crystal nucleus early strength agent
CN113429170A (en) * 2021-08-25 2021-09-24 奥王建筑材料科技有限公司 Anti-crack type construction waste recycled concrete wallboard

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105503020A (en) * 2015-12-30 2016-04-20 卓达新材料科技集团威海股份有限公司 Early strength agent used for ordinary Portland cement fiberboards
CN105503020B (en) * 2015-12-30 2018-01-30 卓达新材料科技集团威海股份有限公司 A kind of early strength agent for Portland cement fiberboard
CN106116217A (en) * 2016-06-24 2016-11-16 桂林华越环保科技有限公司 A kind of concrete light wall panel early strength water-reducing agent
CN107555829A (en) * 2017-08-14 2018-01-09 山西格瑞特建筑科技股份有限公司 A kind of nucleus type for concrete promotees solidifying early strength agent and preparation method thereof
CN107601953A (en) * 2017-10-30 2018-01-19 兰新良 A kind of cement products early strength agent
CN107673650A (en) * 2017-10-30 2018-02-09 兰新良 A kind of concrete hollow block early strength agent
CN107840591B (en) * 2017-12-01 2020-06-26 北京怡居建筑科技有限公司 Cement concrete and application thereof in building wall
CN107840591A (en) * 2017-12-01 2018-03-27 北京怡居建筑科技有限公司 A kind of novel cement concrete and its application in construction wall
CN108249845A (en) * 2017-12-13 2018-07-06 镇江建科建设科技有限公司 A kind of Organic-inorganic composite early strength agent and the self-compacting concrete prepared using the early strength agent
CN109250979A (en) * 2018-08-21 2019-01-22 苏州混凝土水泥制品研究院有限公司 It is a kind of for the composition of super high-early concrete prefabricated component and its super high-early concrete prefabricated component of preparation
CN109250941A (en) * 2018-09-07 2019-01-22 青岛颢天绿色建筑科技有限公司 A kind of regenerated aggregate concrete specific complex additive
CN109485291A (en) * 2019-01-07 2019-03-19 山西佳维新材料股份有限公司 A kind of early diminishing complexing agent and preparation method thereof by force of novel poly-carboxylic high-performance nanometer seed crystal
CN110683785A (en) * 2019-11-14 2020-01-14 江苏博思通新材料有限公司 Concrete crystal nucleus early strength agent
CN113429170A (en) * 2021-08-25 2021-09-24 奥王建筑材料科技有限公司 Anti-crack type construction waste recycled concrete wallboard

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Inventor after: Zhang Xuesong

Inventor before: Wang Chong

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Address before: 400044 Shapingba street, Shapingba District, Chongqing, No. 174

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