CN112174569A - Micron-sized mineral admixture for concrete - Google Patents
Micron-sized mineral admixture for concrete Download PDFInfo
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- CN112174569A CN112174569A CN202011130220.8A CN202011130220A CN112174569A CN 112174569 A CN112174569 A CN 112174569A CN 202011130220 A CN202011130220 A CN 202011130220A CN 112174569 A CN112174569 A CN 112174569A
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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
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- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a micron-sized mineral admixture for concrete, which is prepared from fly ash, silica fume, granulated blast furnace slag powder, limestone powder, hydroxypropyl methyl cellulose, MgO expanding agent, polycarboxylic acid water reducing agent, citric acid, boric acid, sodium gluconate, sodium lithium ammonium persulfate, sodium tartrate, nano-sized calcium dioxide carbonate, nano-sized silicon dioxide, calcium formate, calcium acetate and cellulose ether. The invention can improve the strength of concrete and the workability of concrete; the bleeding is less, the using amount of cement in single-side concrete can be reduced, and the hydration heat in the concrete is reduced; the using amount of free water in the concrete is reduced, the risks of shrinkage and cracking of the concrete are reduced, the compactness of the concrete is improved, and the durability of the concrete is improved.
Description
Technical Field
The invention relates to the technical field of concrete admixtures, in particular to a composite mineral admixture for concrete.
Background
The concrete composite admixture can obviously improve the defects of the portland cement, such as composition, microstructure and the like, which are difficult to overcome, including a deteriorated interfacial region, a crystal phase structure with poor durability, microcracks caused by high hydration heat and the like, endows the concrete with excellent durability and workability, surpasses the traditional significance of cost reduction and environmental protection, becomes an indispensable component of concrete materials, and is called as a sixth component of the concrete. The concrete composite admixture can be widely applied to the fields of various concrete members, grouting materials, repairing materials and the like which take ordinary portland cement as a base material. At present, the research and development of concrete composite admixture are actively developed at home and abroad, but still the following technical difficulties exist: 1. the water requirement is high, so that the construction is difficult and the strength requirement after construction cannot be ensured; 2. the high early strength can not be obtained, the continuous increase of the later strength can be ensured, and even the phenomenon of the backward shrinkage of the later strength can occur; 3. the content of chloride ions exceeds the standard, and the content of ammonium ions exceeds the standard; the ignition loss exceeds the standard; 4. too low a density results in difficult loading and unloading and greatly reduced one-time transportation.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a micron-sized mineral admixture for concrete, which is used for reducing hydration heat caused by hydration of cement in concrete, reducing the using amount of free water in concrete, ensuring that the strength of concrete is increased along with the increase of age, reducing the risks of shrinkage and cracking of concrete, improving the compactness of concrete to meet the shipping requirement, and ensuring that the concrete mixture has good workability and less bleeding.
In order to achieve the purpose, the invention adopts the following technical scheme:
the micron-sized mineral admixture for concrete comprises the following components in parts by weight:
34-36 parts of fly ash;
9-11 parts of silica fume;
39-41 parts of granulated blast furnace slag powder;
12-14 parts of limestone powder;
0.4-0.6 part of hydroxypropyl methyl cellulose;
0.4-0.6 part of MgO expanding agent;
0.7-0.9 part of a polycarboxylic acid water reducing agent;
0.01-0.03 part of citric acid;
0.01-0.03 part of boric acid;
0.01-0.03 part of sodium gluconate;
0.01-0.03 part of sodium lithium ammonium persulfate;
0.01-0.03 part of sodium tartrate;
0.01-0.03 part of nano calcium carbonate dioxide;
0.01-0.03 part of nano silicon dioxide;
0.01-0.03 part of calcium formate;
0.01-0.03 part of calcium acetate;
0.01-0.03 part of cellulose ether.
The fly ash is second-grade fly ash, and the density of the fly ash is more than or equal to 2.5g/m3And the 28d compressive strength ratio is more than or equal to 70 percent.
Further, the silicon dioxide content in the silica fume is more than or equal to 90 wt%, the water content is less than 1 wt%, the ignition loss is less than 6%, the 28d activity index is more than 110%, and the specific surface area is more than or equal to 20m2/g。
Further, the granulated blast furnace slag powder is S95 grade, and the specific surface area is more than or equal to 0.36m2The water content is less than 2 wt%, the ignition loss is less than 8%, and the 28d activity index is more than or equal to 95%.
Furthermore, the limestone powder is prepared by crushing limestone, and the density of the limestone powder is more than or equal to 2.5g/m3The water demand ratio is more than or equal to 100 percent, and the 28d activity index is more than or equal to 70 percent.
The invention has the beneficial effects that:
1. the fly ash adopted by the invention strictly controls the ammonium ion content, the ignition loss and the density according to the national standard, the limestone powder strictly controls the density and the ignition loss according to the national standard, and the granulated blast furnace slag strictly controls the chloride ion content and the ignition loss according to the national standard. Through screening the raw materials of the admixture, the chloride ion content, the ammonium ion content, the loss on ignition and the density are effectively controlled;
2. the compatibility of the water reducing agent and a cementing material is improved by screening the polycarboxylic acid water reducing agent, so that the adaptability of the admixture is improved, the micro-aggregate effect of powder is fully exerted with the minimum void ratio by using a powder matching technology among different particle sizes of raw materials, the lapped voids of the fly ash, the limestone powder and the granulated blast furnace slag are filled by silica fume, and the rest micro voids are filled by nano materials such as nano calcium carbonate and the like, so that the fluidity of slurry is improved, the water demand ratio is reduced, the workability of construction mixtures is effectively ensured, the shrinkage cracking is prevented, and the later strength shrinkage of concrete is inhibited;
3. by adjusting the collocation of different particle sizes among the powder materials, the composite gelling effect and the interface coupling effect of the admixture of the mineral admixture are enabled to play an extreme value, a compact slurry structure can be filled, the pore diameter is improved, large pores are developed towards small pore diameters, the early strength of ordinary portland cement is greatly improved, the stable increase of the later strength is ensured, the density of the mineral admixture is increased, and the transportation cost is reduced.
Detailed Description
Example 1
350kg of fly ash, 100kg of silica fume, 400kg of granulated blast furnace slag powder, 130kg of limestone powder, 5kg of hydroxypropyl methyl cellulose, 5kg of MgO expanding agent, 8kg of polycarboxylic acid water reducing agent, 0.2kg of citric acid, 0.2kg of boric acid, 0.2kg of sodium gluconate, 0.2kg of sodium lithium ammonium persulfate, 0.2kg of sodium tartrate, 0.2kg of nano-calcium dioxide carbonate, 0.2kg of nano-silicon dioxide, 0.2kg of calcium formate, 0.2kg of calcium acetate and 0.2kg of cellulose ether are weighed. And then mechanically mixing and grinding all the weighed materials by a ball mill to prepare the micron-sized mineral admixture for the concrete.
Example 2
Weighing 340kg of fly ash, 110kg of silica fume, 390kg of granulated blast furnace slag powder, 140kg of limestone powder, 6kg of hydroxypropyl methyl cellulose, 4kg of MgO expanding agent, 7kg of polycarboxylic acid water reducing agent, 0.3kg of citric acid, 0.1kg of boric acid, 0.1kg of sodium gluconate, 0.3kg of sodium lithium ammonium persulfate, 0.1kg of sodium tartrate, 0.3kg of nano-calcium dioxide carbonate, 0.1kg of nano-silicon dioxide, 0.1kg of calcium formate, 0.3kg of calcium acetate and 0.3kg of cellulose ether. And then mechanically mixing and grinding all the weighed materials by a ball mill to prepare the micron-sized mineral admixture for the concrete.
Example 3
Weighing 360kg of fly ash, 90kg of silica fume, 410kg of granulated blast furnace slag powder, 120kg of limestone powder, 4kg of hydroxypropyl methyl cellulose, 6kg of MgO expanding agent, 9kg of polycarboxylic acid water reducing agent, 0.1kg of citric acid, 0.3kg of boric acid, 0.3kg of sodium gluconate, 0.1kg of sodium lithium ammonium persulfate, 0.3kg of sodium tartrate, 0.1kg of nano-calcium dioxide carbonate, 0.3kg of nano-silicon dioxide, 0.3kg of calcium formate, 0.1kg of calcium acetate and 0.1kg of cellulose ether. And then mechanically mixing and grinding all the weighed materials by a ball mill to prepare the micron-sized mineral admixture for the concrete.
The fly ash described in the above examples 1, 2 and 3 is second-grade fly ash, and the density of the fly ash is more than or equal to 2.5g/m3And the 28d compressive strength ratio is more than or equal to 70 percent. The silicon dioxide content in the silica fume is more than or equal to 90 percent by weight, the water content is less than 1 percent by weight, the ignition loss is less than 6 percent, the 28d activity index is more than 110 percent, and the specific surface area is more than or equal to 20m2(ii) in terms of/g. The granulated heightThe slag powder is S95 grade, and the specific surface area is more than or equal to 0.36m2The water content is less than 2 wt%, the ignition loss is less than 8%, and the 28d activity index is more than or equal to 95%. The limestone powder is prepared by crushing limestone, and the density of the limestone powder is more than or equal to 2.5g/m3The water demand ratio is more than or equal to 100 percent, and the 28d activity index is more than or equal to 70 percent.
The performance index test results of the micron-sized mineral admixture for concrete prepared in examples 1, 2 and 3 are shown in table 1.
Table 1 table of the results of testing various performance indexes
Table 1 shows that the micron-sized mineral admixture for concrete has the performances of high activity, low water consumption, low content of chloride ions and ammonium ions, easiness in shipment and the like, and compared with the concrete admixture in the prior art, the micron-sized mineral admixture for concrete has the advantages of remarkably improving the indexes of low water consumption, high activity and the like.
The effect of the micron-sized mineral admixtures prepared in examples 1, 2 and 3 added to concrete is shown in Table 2.
TABLE 2 comparison table of the application effect of the micron-sized mineral admixture prepared by the present invention
Note: the cement used was 52.5 portland cement.
Table 2 shows that the indexes of fluidity, pumping performance, compressive strength and the like of the concrete added with the micron-sized mineral admixture prepared by the invention are obviously improved.
The concrete durability of numbers 1, 2, 3 and 4 in table 2 was compared, and the results are shown in table 3.
Table 3 comparative table of concrete durability effect.
Table 3 shows that the indexes of the electric flux, the carbonization depth, the frost resisting times, the cracking area and the like of the concrete added with the admixture are obviously improved.
The data show that the product has the advantages of proper density, small water demand and easy production control, and the cement consumption can be reduced while the concrete strength is improved by adding the product into the concrete. The product of the invention improves the concrete strength, has good concrete workability and less bleeding, can reduce the cement consumption, reduce the water consumption per unit volume, effectively improve the concrete performance, reduce the hydration heat, and greatly improve the durability compared with the common-grade concrete.
Claims (5)
1. The micron-sized mineral admixture for concrete is characterized by comprising the following components in parts by mass:
34-36 parts of fly ash;
9-11 parts of silica fume;
39-41 parts of granulated blast furnace slag powder;
12-14 parts of limestone powder;
0.4-0.6 part of hydroxypropyl methyl cellulose;
0.4-0.6 part of MgO expanding agent;
0.7-0.9 part of a polycarboxylic acid water reducing agent;
0.01-0.03 part of citric acid;
0.01-0.03 part of boric acid;
0.01-0.03 part of sodium gluconate;
0.01-0.03 part of sodium lithium ammonium persulfate;
0.01-0.03 part of sodium tartrate;
0.01-0.03 part of nano calcium carbonate dioxide;
0.01-0.03 part of nano silicon dioxide;
0.01-0.03 part of calcium formate;
0.01-0.03 part of calcium acetate;
0.01-0.03 part of cellulose ether.
2. Such as rightThe micron-sized mineral admixture for concrete according to claim 1, wherein the fly ash is secondary fly ash, and the density of the fly ash is more than or equal to 2.5g/m3And the 28d compressive strength ratio is more than or equal to 70 percent.
3. The admixture of micron-sized minerals for concrete according to claim 1, wherein said silica fume has a silica content of 90% by weight or more, a water content of less than 1% by weight, a loss on ignition of less than 6%, a 28d activity index of more than 110%, and a specific surface area of 20m or more2/g。
4. The micro-sized mineral admixture for concrete according to claim 1, wherein said granulated blast furnace slag powder is of S95 grade, and has a specific surface area of 0.36m or more2The water content is less than 2 wt%, the ignition loss is less than 8%, and the 28d activity index is more than or equal to 95%.
5. The micro-scale mineral admixture for concrete according to claim 1, wherein said limestone powder is obtained by crushing limestone with a density of not less than 2.5g/m3The water demand ratio is more than or equal to 100 percent, and the 28d activity index is more than or equal to 70 percent.
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| CN202011130220.8A CN112174569A (en) | 2020-10-21 | 2020-10-21 | Micron-sized mineral admixture for concrete |
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| CN202011130220.8A CN112174569A (en) | 2020-10-21 | 2020-10-21 | Micron-sized mineral admixture for concrete |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113354307A (en) * | 2021-06-22 | 2021-09-07 | 厦门浩友建材有限公司 | Composite admixture applied to hydraulic concrete and preparation method thereof |
| CN114380524A (en) * | 2022-01-19 | 2022-04-22 | 浙江农林大学暨阳学院 | Mineral admixture of novel building material fly ash-slag geopolymer |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102757193A (en) * | 2012-07-12 | 2012-10-31 | 成都嘉新科技集团有限公司 | Composite admixture for concrete |
| KR101456676B1 (en) * | 2014-06-03 | 2014-11-04 | 주식회사 윤창이엔씨 | Early strength polymer modified cement concrete composite and repairing method of concrete structure using the composite |
| CN108147704A (en) * | 2017-12-25 | 2018-06-12 | 北京中铁房山桥梁有限公司 | Complex mineral blending material and preparation method thereof and the concrete using its preparation |
| CN110436852A (en) * | 2019-08-16 | 2019-11-12 | 中交一公局第五工程有限公司 | A kind of bridge strong concrete and preparation method thereof |
-
2020
- 2020-10-21 CN CN202011130220.8A patent/CN112174569A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102757193A (en) * | 2012-07-12 | 2012-10-31 | 成都嘉新科技集团有限公司 | Composite admixture for concrete |
| KR101456676B1 (en) * | 2014-06-03 | 2014-11-04 | 주식회사 윤창이엔씨 | Early strength polymer modified cement concrete composite and repairing method of concrete structure using the composite |
| CN108147704A (en) * | 2017-12-25 | 2018-06-12 | 北京中铁房山桥梁有限公司 | Complex mineral blending material and preparation method thereof and the concrete using its preparation |
| CN110436852A (en) * | 2019-08-16 | 2019-11-12 | 中交一公局第五工程有限公司 | A kind of bridge strong concrete and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113354307A (en) * | 2021-06-22 | 2021-09-07 | 厦门浩友建材有限公司 | Composite admixture applied to hydraulic concrete and preparation method thereof |
| CN114380524A (en) * | 2022-01-19 | 2022-04-22 | 浙江农林大学暨阳学院 | Mineral admixture of novel building material fly ash-slag geopolymer |
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