CN109748556B - Anti-segregation heavy concrete and preparation method thereof - Google Patents
Anti-segregation heavy concrete and preparation method thereof Download PDFInfo
- Publication number
- CN109748556B CN109748556B CN201910185903.4A CN201910185903A CN109748556B CN 109748556 B CN109748556 B CN 109748556B CN 201910185903 A CN201910185903 A CN 201910185903A CN 109748556 B CN109748556 B CN 109748556B
- Authority
- CN
- China
- Prior art keywords
- segregation
- heavy concrete
- iron ore
- concrete
- additive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The application discloses segregation-resistant heavy concrete and a preparation method thereof, wherein the raw materials of each cubic meter of concrete comprise the following components: 220-300 kg of Portland cement, 50-80 kg of granulated blast furnace slag powder, 2-5 kg of silica fume, 1800-2500 kg of iron ore powder, 700-1000 kg of iron ore sand, 2000-2500 kg of iron ore, 8-15 kg of first additive, 0.01-0.05 kg of second additive, 0.5-1.5 kg of polypropylene fiber and 150-160 kg of mixing water. The preparation method comprises the following steps: adding the portland cement, the granulated blast furnace slag powder, the silica fume, the iron ore powder, the iron ore sand and the polypropylene fiber into a concrete mixer for stirring; adding mixing water, the first additive and the second additive, and continuously stirring; and finally adding iron ore and uniformly stirring. The heavy concrete prepared by the method has good segregation resistance and can be used for pumping construction.
Description
Technical Field
The application belongs to the technical field of concrete materials, and particularly relates to segregation-resistant heavy concrete and a preparation method thereof.
Background
With the continuous development of modern civil engineering technology, some projects put forward special requirements on concrete performance, and put forward higher requirements on the performances of concrete such as apparent density, and heavy concrete is required for construction. The heavy concrete technology is applied to the civil engineering fields of radiation-proof concrete engineering, concrete structure balance weight of bridge engineering, underground engineering anti-floating concrete, submarine pipeline balance weight concrete, wear-resistant terrace, hydraulic engineering anti-abrasion concrete and the like, can meet the requirements of special functional technology, and shows unique technical performance.
The apparent density of the heavy concrete is generally 2600kg/m3The above can be realized only by adopting special aggregate with higher density for preparation and special construction process. Because of the high aggregate density of the heavy concrete, the concrete is easy to separate and the slump loss of the concreteLarge loss and difficult pumping, and the technical problems of concrete preparation, construction performance and the like need to be solved. Therefore, the heavy concrete needs to adopt a specific preparation technology, solves the technical problems of difficult concrete pumping construction, easy segregation of aggregate in the vibrating process and the like, and ensures the construction quality of the heavy concrete.
Content of application
In view of the above-mentioned drawbacks or disadvantages of the prior art, it is an object of the present application to provide segregation-resistant heavy concrete and a method for preparing the same.
In order to solve the above technical problem, the present application has the following configurations:
an anti-segregation heavy concrete, wherein the raw materials of each cubic meter of the heavy concrete comprise the following components:
220-300 kg of Portland cement,
50-80 kg of granulated blast furnace slag powder,
2-5 kg of silica fume,
1800-2500 kg of iron ore powder,
700-1000 kg of iron ore sand,
2000-2500 kg of iron ore,
8-15 kg of the first additive,
0.01-0.05 kg of second additive,
0.5 to 1.5kg of polypropylene fiber,
mixing water is 150-160 kg.
As a further improvement, the portland cement is portland cement with the strength grade not lower than 42.5; preferably, the portland cement is ordinary portland cement having a strength grade of 42.5.
As a further improvement, the granulated blast furnace slag powder is granulated blast furnace slag powder with the grade not lower than S75, and preferably, the granulated blast furnace slag powder is granulated blast furnace slag powder with the grade of S95. The granulated blast furnace slag powder is used as the concrete mineral admixture, has high activity, can improve the later strength of heavy concrete, and has good filling effect.
As a further improvement, the siliconSpecific surface area of ash is more than 18000m2Activity index per kg, 28 days, is greater than 95%. Preferably, the specific surface area of the silica fume is more than 18500m2Kg, an activity index of more than 98% in 28 days. Wherein, this application adopts the silica fume as concrete mineral admixture.
In the present application, the portland cement, granulated blast furnace slag powder, and silica fume constitute a gel material.
As a further improvement, the iron ore powder is formed by crushing and processing iron ore, wherein the screen residue of a screen with the fineness of 0.15mm of the iron ore powder is less than 10 percent, and the apparent density is more than 5800kg/m3。
As a further improvement, the fineness modulus of the iron ore sand is 2.5-3.5, the water content is not more than 0.5%, and the apparent density is more than 6000kg/m3。
As a further improvement, the maximum grain diameter of the iron ore is not more than 31.5mm, the iron ore is in 5-31.5 continuous gradation, the water content is not more than 0.5 percent, and the apparent density is more than 6500kg/m3。
As a further improvement, the first additive is a polycarboxylic acid high-performance water reducing agent, and the water reducing rate of the first additive is more than 25%.
As a further improvement, the second additive is hydroxypropyl methyl cellulose ether with the viscosity not less than 200000 MPa-S.
As a further improvement, the polypropylene fibers have a density of 0.91g/m3The tensile strength is not less than 300MPa, the elongation is 28%, the elastic modulus is 3500MPa, and the length is 10mm-14 mm.
Wherein the 7-day compressive strength of the heavy concrete is more than 30MPa, the 28-day compressive strength is more than 40MPa, and the apparent density is more than 5500kg/m3Slump of 180 mm-220 mm, and segregation resistance of not more than 10%.
The application also provides a preparation method of the segregation-resistant heavy concrete, which comprises the following steps:
adding the portland cement, the granulated blast furnace slag powder, the silica fume, the iron ore powder, the iron ore sand and the polypropylene fiber into a concrete mixer for stirring; wherein, the stirring time is preferably 1 min;
adding mixing water, the first additive and the second additive, and continuously stirring, wherein the stirring time is preferably 1 min;
finally, adding iron ore and uniformly stirring, wherein the stirring time is preferably 1 min.
Compared with the prior art, the method has the following technical effects:
the application further provides a better heavy concrete mixing ratio in terms of comprehensively considering the strength, the apparent density, the segregation resistance and the like of the heavy concrete, namely, the dosage of the cementing material of the heavy concrete is 300kg/m3～360kg/m3(ii) a The hydration and compact filling functions of the portland cement, the granulated blast furnace slag powder and the silica fume are adopted, so that the strength and the compactness of the heavy concrete are ensured; the high density and close packing of the iron ore powder, the iron ore sand and the iron ore can ensure the apparent density of the heavy concrete; the polycarboxylic acid high-performance water reducing agent is adopted to ensure that the heavy concrete has good working performance; the segregation resistance of the heavy concrete is ensured by adopting the hydroxypropyl methyl cellulose ether and the polypropylene fiber, the hydroxypropyl methyl cellulose ether has the advantages of increasing the viscosity of a cementing material and improving the segregation resistance of the heavy concrete, and after the polypropylene is doped into the fiber, the polypropylene can be uniformly dispersed in the concrete to form a three-dimensional network structure in the concrete, thereby effectively preventing the aggregate segregation phenomenon of the heavy concrete and improving the integral uniformity of the heavy concrete.
Detailed Description
The conception, specific structure and technical effects of the present application will be further described below to fully understand the purpose, features and effects of the present application.
1. Raw materials of the present example
(1) Portland cement: ordinary portland cement having a strength grade of 42.5.
(2) Granulating blast furnace slag powder: s95 granulating the blast furnace slag powder.
(3) Silica fume: the specific surface area is 18500m2Activity index of 98% in 28 days per kg.
(4) Iron ore powder: apparent density 5850kg/m3。
(5) Iron ore sand: fineness modulus of 3.0, water content of 0.3%, and apparent density of 6050kg/m3。
(6) Iron ore: 5-31.5mm continuous gradation, water content of 0.3%, apparent density of 6550kg/m3。
(6) A first admixture: the polycarboxylic acid high-performance water reducing agent has the water reducing rate of 30 percent.
(7) A second additive: hydroxypropyl methylcellulose ether with a viscosity of 200000MPa · S.
(8) Polypropylene fiber: the density was 0.91g/m3(ii) a The tensile strength is 300 MPa; elongation 28%, elastic modulus 3500MPa, length 10 mm.
(9) Mixing water: city tap water.
2. Test method of the present example
(1) Slump, apparent density and compressive strength
Performing concrete slump and apparent density tests according to relevant regulations of standard of common concrete mixture performance test method (GB/T50080); the compressive strength test was carried out according to the regulations of Standard test methods for mechanical Properties of ordinary concrete (GB/T50081).
(2) Resistance to segregation
The segregation resistance of heavy concrete was tested according to the mixture stabilization type diving table test of the standard of the Chinese civil engineering society for engineering, self-compacting concrete design and construction guide (CCES 02-2004).
3. The mix proportion of the heavy concrete of the embodiment
The concrete is prepared from materials such as ordinary Portland cement with the grade of 42.5, and the mixing ratio of the concrete is shown in Table 1.
TABLE 1 weight concrete mix ratio (kg/m)3)
4. The preparation method of the segregation-resistant heavy concrete comprises the following steps:
the method comprises the following steps: adding the portland cement, the granulated blast furnace slag powder, the silica fume, the iron ore powder, the iron ore sand and the polypropylene fiber into a concrete mixer for stirring; wherein, the stirring time is preferably 1 min;
step two: adding mixing water, the first additive and the second additive, and continuously stirring, wherein the stirring time is preferably 1 min;
step three: finally adding iron ore and uniformly stirring, wherein the stirring time is preferably 1 min;
step four: the preparation of the segregation-resistant heavy concrete is completed.
5. The prepared heavy concrete was tested for its properties.
In this example, the test results of concrete slump, apparent density, segregation resistance and compressive strength are shown in Table 2.
TABLE 2 test results of concrete slump, apparent density, segregation resistance and compressive strength
The test results show that the slump of the heavy concrete prepared by the embodiment is more than 180mm, the segregation resistance is less than 10%, and the requirements of pumping concrete can be met; apparent density is more than 5500kg/m3The concrete has the quality requirement of overweight concrete; the compressive strength of the concrete is more than 30.0MPa in 7 days, and the compressive strength of the concrete is more than 40.0MPa in 28 days; the compression strength of the heavy concrete is ensured due to the hydration and dense filling functions of the portland cement, the granulated blast furnace slag powder and the silica fume; the adopted iron ore powder, iron ore sand and iron ore have higher density and compact stacking density, so that the heavy concrete can have ultrahigh apparent density; the high-performance polycarboxylic acid water reducing agent can ensure that the heavy concrete has high workability; the adoption of hydroxypropyl methyl cellulose ether and polypropylene fiber can effectively ensure heavy concreteAnti-segregation performance.
The above embodiments are merely to illustrate the technical solutions of the present application and are not limitative, and the present application is described in detail with reference to preferred embodiments. It will be understood by those skilled in the art that various modifications and equivalent arrangements may be made in the present invention without departing from the spirit and scope of the present invention and shall be covered by the appended claims.
Claims (11)
1. An anti-segregation heavy concrete, which is characterized in that,
the raw materials of the heavy concrete per cubic meter comprise the following components:
the apparent density of the heavy concrete is more than 5500kg/m3，
The first additive is a polycarboxylic acid high-performance water reducing agent, and the second additive is hydroxypropyl methyl cellulose ether.
2. The segregation resistant heavy concrete according to claim 1, wherein the granulated blast furnace slag powder is granulated blast furnace slag powder with a grade of not less than S75.
3. Segregation-resistant heavy concrete according to claim 1, characterized in that the silica fume has a specific surface area of more than 18000m2Activity index per kg, 28 days, is greater than 95%.
4. The segregation-resistant heavy concrete according to claim 1, wherein the iron ore powder is obtained by crushing and processing iron ore, wherein the iron ore powder has a fineness of 0.15mm, a screen residue of a screen less than 10%, and an apparent density of more than 5800kg/m3。
5. Segregation-resistant heavy concrete according to claim 1, characterised in thatThe fineness modulus of the iron ore sand is 2.5-3.5, the water content is not more than 0.5%, and the apparent density is more than 6000kg/m3。
6. The segregation-resistant heavy concrete according to claim 1, wherein the iron ore has a maximum particle size of not more than 31.5mm, is in a 5-31.5 continuous gradation, has a water content of not more than 0.5%, and has an apparent density of more than 6500kg/m3。
7. The segregation-resistant heavy concrete according to claim 1, wherein the polycarboxylic acid high performance water reducer has a water reduction rate of more than 25%.
8. The segregation-resistant heavy concrete according to claim 1, wherein the viscosity of the hydroxypropyl methylcellulose ether is not less than 200000 MPa-S.
9. Segregation-resistant heavy concrete according to claim 1, characterised in that the polypropylene fibres have a density of 0.91g/m3The tensile strength is not less than 300MPa, the elongation is 28%, the elastic modulus is 3500MPa, and the length is 10mm-14 mm.
10. The segregation-resistant heavy concrete according to any one of claims 1 to 9, wherein the heavy concrete has a 7-day compressive strength of more than 30MPa, a 28-day compressive strength of more than 40MPa, a slump of 180mm to 220mm, and a segregation resistance of not more than 10%.
11. The method for the preparation of segregation-resistant heavy concrete according to any of claims 1 to 10, comprising the steps of:
adding the portland cement, the granulated blast furnace slag powder, the silica fume, the iron ore powder, the iron ore sand and the polypropylene fiber into a concrete mixer for stirring;
adding mixing water, the first additive and the second additive, and continuously stirring;
and finally adding iron ore and uniformly stirring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910185903.4A CN109748556B (en) | 2019-03-12 | 2019-03-12 | Anti-segregation heavy concrete and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910185903.4A CN109748556B (en) | 2019-03-12 | 2019-03-12 | Anti-segregation heavy concrete and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109748556A CN109748556A (en) | 2019-05-14 |
| CN109748556B true CN109748556B (en) | 2021-05-07 |
Family
ID=66408464
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910185903.4A Active CN109748556B (en) | 2019-03-12 | 2019-03-12 | Anti-segregation heavy concrete and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109748556B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114031347B (en) * | 2021-11-16 | 2023-05-09 | 苏州混凝土水泥制品研究院有限公司 | High-performance weight concrete for balancing weight of washing machine and preparation method thereof |
| CN114180910B (en) * | 2021-12-11 | 2022-08-09 | 武汉昌华汇鑫建材有限公司 | Heavy concrete and preparation process thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0475831A1 (en) * | 1990-09-14 | 1992-03-18 | Electricite De France | Anti-radiation heavy concrete, particular for use in the manufacture of radioactive waste containers |
| CN101676239A (en) * | 2008-09-19 | 2010-03-24 | 湖南省第六工程有限公司 | Premixed and pumped heavy concrete |
| CN103224369A (en) * | 2013-04-09 | 2013-07-31 | 四川省交通运输厅公路规划勘察设计研究院 | Anti-radiation concrete produced from slag aggregate, and production method thereof |
| CN104529297A (en) * | 2014-12-18 | 2015-04-22 | 广东省建筑工程集团有限公司 | Neutron irradiation preventing low-hydration-heat barite concrete |
| CN106278061A (en) * | 2016-09-10 | 2017-01-04 | 江苏省建筑工程集团丰达混凝土有限公司 | A kind of weight concrete |
| CN108585685A (en) * | 2018-05-18 | 2018-09-28 | 上海中冶环境工程科技有限公司 | A kind of pipeline balance material and preparation method thereof |
-
2019
- 2019-03-12 CN CN201910185903.4A patent/CN109748556B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0475831A1 (en) * | 1990-09-14 | 1992-03-18 | Electricite De France | Anti-radiation heavy concrete, particular for use in the manufacture of radioactive waste containers |
| CN101676239A (en) * | 2008-09-19 | 2010-03-24 | 湖南省第六工程有限公司 | Premixed and pumped heavy concrete |
| CN103224369A (en) * | 2013-04-09 | 2013-07-31 | 四川省交通运输厅公路规划勘察设计研究院 | Anti-radiation concrete produced from slag aggregate, and production method thereof |
| CN104529297A (en) * | 2014-12-18 | 2015-04-22 | 广东省建筑工程集团有限公司 | Neutron irradiation preventing low-hydration-heat barite concrete |
| CN106278061A (en) * | 2016-09-10 | 2017-01-04 | 江苏省建筑工程集团丰达混凝土有限公司 | A kind of weight concrete |
| CN108585685A (en) * | 2018-05-18 | 2018-09-28 | 上海中冶环境工程科技有限公司 | A kind of pipeline balance material and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 抗漂浮重混凝土的配合比设计及应用;严新华;《商品混凝土》;20180531(第5期);第55-59页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109748556A (en) | 2019-05-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111499294B (en) | Ultrahigh-performance concrete dry powder and preparation method thereof | |
| CN111848026A (en) | Alkali-activated nano-reinforced early-strength type ultrahigh-performance concrete and preparation method thereof | |
| CN112679162B (en) | Low-shrinkage ultrahigh-strength self-compacting concrete and preparation method thereof | |
| CN105060792A (en) | Low-dosage steel fiber modified powder concrete | |
| CN109279861B (en) | Self-compacting composite concrete, preparation method thereof and concrete wall brick | |
| CN105967591A (en) | High-fluidity duct grouting material suitable for ultra-long pre-stressed ducts, and preparation method thereof | |
| CN106927761A (en) | The high performance concrete of admixture iron tailings sand, silicon ash and basalt fibre | |
| CN108585679B (en) | Low-shrinkage green UHPC and preparation method thereof | |
| CN113651574B (en) | Counterweight cement-based composite material and preparation method thereof | |
| CN110357538A (en) | A kind of regeneration self-compacting concrete and preparation method thereof | |
| CN105645879A (en) | Preparation method of ultra-high-strength steel fiber reinforced concrete for super-high pumping | |
| CN109748556B (en) | Anti-segregation heavy concrete and preparation method thereof | |
| CN111517714A (en) | Easily-pumped coarse aggregate-containing ultra-high performance concrete and preparation method thereof | |
| CN113651583A (en) | High-strength high-toughness anti-abrasion concrete and preparation method thereof | |
| CN110746159A (en) | Anti-crack pumping concrete and preparation method and pumping method thereof | |
| CN107324713A (en) | A kind of self-compaction concrete filled steel tube and preparation method thereof | |
| CN107973555A (en) | A kind of glass fibre self-compacting concrete | |
| CN110759684B (en) | Double-aggregate cement mortar and preparation method thereof | |
| CN111792905A (en) | Limestone tailing filling material and preparation method and application thereof | |
| CN111362636A (en) | C60 carbon fiber concrete and preparation method thereof | |
| CN112500093B (en) | Concrete suitable for TBM (tunnel boring machine) pressure casting construction and preparation method thereof | |
| CN113754390A (en) | High-strength ultrahigh-pumping self-compacting concrete and preparation method thereof | |
| CN112521088A (en) | Full-hole slag aggregate ultrahigh-performance concrete and preparation method thereof | |
| CN107098660A (en) | Steel Bridge Deck is rigidly mated formation with high-strength tenacity concrete material and preparation method thereof | |
| JP2005314120A (en) | High strength mortar |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |