CN102153309A - Preparation method of nano modifier for improving high-temperature deterioration performance of concrete - Google Patents
Preparation method of nano modifier for improving high-temperature deterioration performance of concrete Download PDFInfo
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- CN102153309A CN102153309A CN 201010564165 CN201010564165A CN102153309A CN 102153309 A CN102153309 A CN 102153309A CN 201010564165 CN201010564165 CN 201010564165 CN 201010564165 A CN201010564165 A CN 201010564165A CN 102153309 A CN102153309 A CN 102153309A
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Abstract
The invention relates to a preparation method of a nano modifier for improving high-temperature deterioration performance of concrete, which comprises the following steps: generating a nano calcium carbonate emulsion by using a carbonation reactor, and dewatering the nano calcium carbonate emulsion to form nano calcium carbonate slurry of which the water content is 40-60%; drying the nano calcium carbonate slurry and mineral powder in a weight ratio of 1:(10-15), and carrying out mixed grinding for 1-2 hours, thereby obtaining a nano composite mineral admixture; and respectively mixing the nano composite mineral admixture with redispersible latex powder and cellulose ether in weight ratios of 1:(0.1-0.15) and 1:(0.01-0.015), thereby forming the nano modifier for improving high-temperature deterioration performance of concrete. The preparation method provided by the invention has the advantage of simple technique, and improves the comprehensive effects against the high-temperature deterioration of concrete from many perspectives, so that the modifier has an obvious effect of improving the high-temperature deterioration of concrete.
Description
Technical field
The present invention relates to a kind of preparation method who is used to improve the nano modifier of concrete high temperature deteriorate performance.
Background technology
At present, concrete is used widely at all kinds of construction projects as modal engineering materials in the engineering.But close at high temperature environment fields such as high-temperature workshops, and the influence of urgent factor such as fire, concrete can cause tangible deterioration because of inner hydrated product thermal dehydration or decomposition, thereby badly influence the safety of entire structure and user's the security of the lives and property, concrete high temperature deterioration has obtained the extensive concern of various circles of society.
Both at home and abroad experiment and research data show, concrete high temperature deterioration is mainly from improving mechanical performance of concrete, improving that the concrete hydrating product is formed and the methods such as angle of adding the fiber raising concrete capability of antidetonance are improved.Yet, the raising of mechanical performance of concrete can not prevent inner hydrated product thermal dehydration or decomposition on the one hand, on the other hand even have more hydrated product and at high temperature change, therefore for concrete high temperature deteriorate performance to improve effect very limited; Mix mineral additives such as flyash, breeze and make that hydrated product content such as calcium hydroxide significantly reduces in the concrete hydrating mineral composition, thereby improve concrete high temperature resistance deteriorate performance, this is a kind of a kind of means of improving the high temperature resistant deteriorate performance of concrete, yet also exist means single, improve the limited weakness of effect, especially fire etc. is surpassed 500 ℃ high temperature deterioration and improves poor effect; Mix steel fiber, polypropylene fibre and can improve the concrete capability of antidetonance really, yet can not substantially improve concrete high temperature resistance deteriorate performance.Therefore, the above various measures that improve concrete high temperature deteriorate performance, owing to do not carry out comprehensive improvement from concrete structure and material angle, so can't reach the ideal effect.
Invention Inner holds
The objective of the invention is to overcome deficiency of the prior art, a kind of preparation method who is used to improve the nano modifier of concrete high temperature deteriorate performance is provided.
Be used to improve the preparation method of the nano modifier of concrete high temperature deteriorate performance, may further comprise the steps:
(1) adopt carbonization reactor to generate the nano-calcium carbonate emulsion, the formation water ratio is 40%～60% nano-calcium carbonate slurry after processed;
(2) with nano-calcium carbonate slurry and breeze by weight 1: 10～15 through super-dry and mix grinding 1～2h, obtain nano combined mineral additive;
(3) nano combined mineral additive is mixed the nano modifier that formation improves concrete high temperature deteriorate performance with redispersable latex powder, ether of cellulose according to weight ratio 1: 0.1～0.15 and 1: 0.01～0.015.
Among the present invention, described breeze is the above breeze of S95 level, and described redispersable latex powder is organic-silicon-modified vinylchlorid-ethene-lauroyl vinyl acetate polymkeric substance, and described ether of cellulose is a Walocel MT 20.000PV ether.
Compared with prior art, the invention has the beneficial effects as follows:
Preparation technology of the present invention is simple, at concrete high temperature deterioration, the present invention carries out the improvement of net effect from three angles, the one, improve concrete aquation mineral composition, owing to contain more breeze among the present invention, so hydrated product content such as concrete calcium hydroxide are reduced significantly, thereby reduce the influence degree of high temperature to concrete performance, especially simultaneously mix the nano-calcium carbonate slurry, this material helps the hydration reaction of breeze and the further performance of high temperature resistant deterioration usefulness; The 2nd, add the redispersable latex powder polymkeric substance, thereby make concrete gelling property comprehensively realize by cement and two kinds of materials of polymkeric substance, even the gelling property variation of cement at high temperature, but polymkeric substance still can keep good gelling property, thereby helps the complete of concrete structure under the high temperature and significantly improve concrete high temperature resistant deteriorate performance; The 3rd, add ether of cellulose, thereby strengthened the bonding between each material of inside concrete, improve concrete high-temperature corrosion resistance performance, ether of cellulose and redispersable latex powder polymkeric substance have increased the micro porosity and the sealed porosity rate of inside concrete together simultaneously, the thermal expansion that makes high temperature produce has had the passage of evacuating, and helps reducing the stress that the concrete thermal expansion produces.Above aggregate measures make the present invention have the remarkable effect of improving concrete high temperature deteriorate performance.
Specific embodiment
Below the present invention is further described by example.
Embodiment 1
(1) adopt carbonization reactor to generate the nano-calcium carbonate emulsion, the formation water ratio is 40% nano-calcium carbonate slurry after processed;
(2) with nano-calcium carbonate slurry and breeze by weight 1: 10 through super-dry and mix grinding 1h, obtain nano combined mineral additive;
(3) nano combined mineral additive was mixed the nano modifier that formation improves concrete high temperature deteriorate performance with redispersable latex powder, ether of cellulose in 1: 0.1 and 1: 0.01 according to weight ratio.
The ratio of this nano modifier with 30% (weight ratio) of cement consumption is incorporated in the concrete, normal curing after 28 days places concrete carries out repeatedly the heating cycle test under 200 ℃, be 8 hours each heat-up time, after 12 heating cycle, compare with the concrete of not mixing nano modifier, the concrete crushing strength that mixes nano modifier becomes growth by 3.7% from reducing by 9.4%.
Embodiment 2
(1) adopt carbonization reactor to generate the nano-calcium carbonate emulsion, the formation water ratio is 60% nano-calcium carbonate slurry after processed;
(2) with nano-calcium carbonate slurry and breeze by weight 1: 15 through super-dry and mix grinding 2h, obtain nano combined mineral additive;
(3) nano combined mineral additive was mixed the nano modifier that formation improves concrete high temperature deteriorate performance with redispersable latex powder, ether of cellulose in 1: 0.15 and 1: 0.015 according to weight ratio.
The ratio of this nano modifier with 30% (weight ratio) of cement consumption is incorporated in the concrete, normal curing after 28 days places concrete carries out repeatedly the heating cycle test under 200 ℃, be 8 hours each heat-up time, after 12 heating cycle, compare with the concrete of not mixing nano modifier, the concrete crushing strength that mixes nano modifier becomes growth by 5.2% from reducing by 9.4%.
Embodiment 3
(1) adopt carbonization reactor to generate the nano-calcium carbonate emulsion, the formation water ratio is 40% nano-calcium carbonate slurry after processed;
(2) with nano-calcium carbonate slurry and breeze by weight 1: 10 through super-dry and mix grinding 1h, obtain nano combined mineral additive;
(3) nano combined mineral additive was mixed the nano modifier that formation improves concrete high temperature deteriorate performance with redispersable latex powder, ether of cellulose in 1: 0.1 and 1: 0.01 according to weight ratio.
The ratio of this nano modifier with 30% (weight ratio) of cement consumption is incorporated in the concrete, normal curing after 28 days places concrete carries out repeatedly the heating cycle test under 500 ℃, be 8 hours each heat-up time, after 12 heating cycle, compare with the concrete of not mixing nano modifier, the concrete crushing strength that mixes nano modifier becomes reduction by 25.8% from reducing by 75.9%.
Embodiment 4
(1) adopt carbonization reactor to generate the nano-calcium carbonate emulsion, the formation water ratio is 60% nano-calcium carbonate slurry after processed;
(2) with nano-calcium carbonate slurry and breeze by weight 1: 15 through super-dry and mix grinding 2h, obtain nano combined mineral additive;
(3) nano combined mineral additive was mixed the nano modifier that formation improves concrete high temperature deteriorate performance with redispersable latex powder, ether of cellulose in 1: 0.15 and 1: 0.015 according to weight ratio.
The ratio of this nano modifier with 30% (weight ratio) of cement consumption is incorporated in the concrete, normal curing after 28 days places concrete carries out repeatedly the heating cycle test under 500 ℃, be 8 hours each heat-up time, after 12 heating cycle, compare with the concrete of not mixing nano modifier, the concrete crushing strength that mixes nano modifier becomes reduction by 12.7% from reducing by 75.9%.
Embodiment 5
(1) adopt carbonization reactor to generate the nano-calcium carbonate emulsion, the formation water ratio is 60% nano-calcium carbonate slurry after processed;
(2) with nano-calcium carbonate slurry and breeze by weight 1: 15 through super-dry and mix grinding 2h, obtain nano combined mineral additive;
(3) nano combined mineral additive was mixed the nano modifier that formation improves concrete high temperature deteriorate performance with redispersable latex powder, ether of cellulose in 1: 0.15 and 1: 0.015 according to weight ratio.
The ratio of this nano modifier with 30% (weight ratio) of cement consumption is incorporated in the concrete, normal curing after 28 days places concrete carries out repeatedly the heating cycle test under 800 ℃, be 8 hours each heat-up time, after 3 heating cycle, compare with the concrete of not mixing nano modifier, the concrete crushing strength that mixes nano modifier becomes reduction by 16.1% from reducing by 91.2%.
Method preparation technology of the present invention is simple, through the dry mix grinding of nano-calcium carbonate and breeze and with make the nano modifier that improves concrete high temperature deteriorate performance after redispersion latex powder and ether of cellulose mix.This nano modifier has following three characteristics, the one, improve concrete aquation mineral composition, because breeze can make hydrated product content such as concrete calcium hydroxide reduce significantly, thereby reduce the influence degree of high temperature to concrete performance, the nano-calcium carbonate slurry that mixes simultaneously more helps the hydration reaction of breeze and the further performance of high temperature resistant deterioration usefulness; The 2nd, add the redispersable latex powder polymkeric substance, thereby make concrete gelling property comprehensively realize by cement and two kinds of materials of polymkeric substance, even the gelling property variation of cement at high temperature, but polymkeric substance still can keep good gelling property, thereby helps the complete of concrete structure under the high temperature and significantly improve concrete high temperature resistant deteriorate performance; The 3rd, add ether of cellulose, thereby strengthened the bonding between each material of inside concrete, improve concrete high-temperature corrosion resistance performance, ether of cellulose and redispersable latex powder polymkeric substance have increased the micro porosity and the sealed porosity rate of inside concrete together simultaneously, the thermal expansion that makes high temperature produce has had the passage of evacuating, and helps reducing the stress that the concrete thermal expansion produces.
What more than enumerate only is specific embodiments of the invention.Obviously, the invention is not restricted to above embodiment, in the protection domain of spirit of the present invention and claim,, all should think protection scope of the present invention any modification and the change that the present invention makes.
Claims (4)
1. preparation method who improves the nano modifier of concrete high temperature deteriorate performance is characterized in that may further comprise the steps:
(1) adopt carbonization reactor to generate the nano-calcium carbonate emulsion, the formation water ratio is 40%～60% nano-calcium carbonate slurry after processed;
(2) with nano-calcium carbonate slurry and breeze by weight 1: 10～15 through super-dry and mix grinding 1～2h, obtain nano combined mineral additive;
(3) nano combined mineral additive is mixed the nano modifier that formation improves concrete high temperature deteriorate performance according to weight ratio 1: 0.1～0.15 and 1: 0.01～0.015 respectively with redispersable latex powder, ether of cellulose.
2. the preparation method who improves the nano modifier of concrete high temperature deteriorate performance according to claim 1 is characterized in that described breeze is the above breeze of S95 level.
3. the preparation method who improves the nano modifier of concrete high temperature deteriorate performance according to claim 1 is characterized in that described redispersable latex powder is organic-silicon-modified vinylchlorid-ethene-lauroyl vinyl acetate polymkeric substance.
4. the preparation method who improves the nano modifier of concrete high temperature deteriorate performance according to claim 1 is characterized in that described ether of cellulose is a Walocel MT 20.000PV ether.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4212842C2 (en) * | 1992-04-16 | 1995-09-07 | Gruenzweig & Hartmann | Needle felt with cover layer and process for its production |
| CN1919776A (en) * | 2006-09-12 | 2007-02-28 | 太原理工大学 | Heat insulating mortar and construction method thereof in floor radiation heating |
| JP2007269536A (en) * | 2006-03-31 | 2007-10-18 | Sumitomo Osaka Cement Co Ltd | Inorganic and elastic crack injection material |
| CN101234861A (en) * | 2008-01-31 | 2008-08-06 | 浙江大学 | Method for preparing nano modified concrete complex mineral blending material |
| CN101250048A (en) * | 2007-02-25 | 2008-08-27 | 陈雄载 | Heat-proof insulation waterproof dry-mixed mortar and preparation thereof |
| CN101880145A (en) * | 2010-06-13 | 2010-11-10 | 成都威邦科技有限公司 | Tunnel fire retardant coating and preparation process and construction process thereof |
-
2010
- 2010-11-30 CN CN 201010564165 patent/CN102153309A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4212842C2 (en) * | 1992-04-16 | 1995-09-07 | Gruenzweig & Hartmann | Needle felt with cover layer and process for its production |
| JP2007269536A (en) * | 2006-03-31 | 2007-10-18 | Sumitomo Osaka Cement Co Ltd | Inorganic and elastic crack injection material |
| CN1919776A (en) * | 2006-09-12 | 2007-02-28 | 太原理工大学 | Heat insulating mortar and construction method thereof in floor radiation heating |
| CN101250048A (en) * | 2007-02-25 | 2008-08-27 | 陈雄载 | Heat-proof insulation waterproof dry-mixed mortar and preparation thereof |
| CN101234861A (en) * | 2008-01-31 | 2008-08-06 | 浙江大学 | Method for preparing nano modified concrete complex mineral blending material |
| CN101880145A (en) * | 2010-06-13 | 2010-11-10 | 成都威邦科技有限公司 | Tunnel fire retardant coating and preparation process and construction process thereof |
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Application publication date: 20110817 |