CN112028578A - Basalt fiber active powder concrete suitable for seasonal freezing area - Google Patents
Basalt fiber active powder concrete suitable for seasonal freezing area Download PDFInfo
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- CN112028578A CN112028578A CN202010976654.3A CN202010976654A CN112028578A CN 112028578 A CN112028578 A CN 112028578A CN 202010976654 A CN202010976654 A CN 202010976654A CN 112028578 A CN112028578 A CN 112028578A
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- concrete
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- basalt fiber
- powder concrete
- seasonal freezing
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/06—Quartz; Sand
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/46—Rock wool ; Ceramic or silicate fibres
- C04B14/4643—Silicates other than zircon
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The basalt fiber active powder concrete suitable for the seasonal freezing area comprises the following raw materials in parts by weight: 814-854 parts of cement, 198-220 parts of silica fume, 901-950 parts of quartz sand, 159-171 parts of water, 51-53 parts of a water reducing agent and 4-12 parts of basalt fiber. According to the invention, the quartz sand is used as the aggregate, the internal structure is more compact, the gaps are more tiny and are not communicated with each other, the concrete is not easy to be corroded by the outside, and the chloride ion corrosion resistance of the concrete is improved. The cement used is small in quantity and CO2The discharge amount is small, and the environmental protection requirement is met; the basalt fiber and the concrete which are mixed in the invention are silicate materials, and the two materials have natural compatibility, so that the basalt fiber can be mixed in the concreteThe concrete can be dispersed evenly more easily. The basalt fiber can inhibit the development of concrete cracks and reduce water entering the concrete under the action of micro reinforcement on the concrete, so that the frost resistance of the concrete is obviously improved.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to basalt fiber active powder concrete suitable for seasonal freezing areas.
Background
In actual engineering of a seasonal freezing area, concrete materials are exposed to complex environmental conditions, and freeze-thaw damage of concrete is a common disease in concrete structure engineering of the seasonal freezing area. However, the concrete in the seasonal freezing area is not only damaged by freezing and thawing, but also often corroded by chloride salt due to the use of a snow-melting agent, and the freezing and thawing cycle can promote the diffusion of chloride ions in the active powder. The freeze thawing and the chlorine salt erosion act together to damage concrete materials, so that the performance of a concrete structure is deteriorated, the safety and the durability of the concrete structure are seriously influenced, and huge economic loss and casualties can be caused in severe cases. Therefore, the research on the anti-freezing performance of the concrete under the action of the chloride-freeze-thaw coupling has important practical significance.
The frost resistance of the concrete can be improved to a certain extent by applying the steel fiber modified reactive powder concrete, but the steel fiber as a metal fiber is very easy to corrode in acid-base solution and even in air, the corrosion resistance is poor, and the steel fiber is not beneficial to the healthy development of ecological environment along with a large amount of industrial wastewater and pollutants in the production process.
Therefore, the problem to be solved urgently is to develop novel concrete which is suitable for seasonal freezing areas and has strong frost resistance under the action of chloride-freeze thawing coupling and reduce the freeze-thaw diseases of the concrete in the seasonal freezing areas by using environment-friendly materials.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the basalt fiber active powder concrete which has good frost resistance under the action of chloride ion erosion and is suitable for seasonal freezing areas.
The basalt fiber active powder concrete suitable for the seasonal freezing area comprises the following raw materials in parts by weight: 814-854 parts of cement, 198-220 parts of silica fume, 901-950 parts of quartz sand, 159-171 parts of water, 51-53 parts of a water reducing agent and 4-12 parts of basalt fiber.
Furthermore, the cement is P.O 42.5 grade ordinary portland cement.
Further, the silica fume is an active mineral admixture with the mass fraction of 93.3 percent and the density of 2.12g/cm3Specific surface area of 18100m2/kg。
Further, the quartz sand is a mixture of three quartz sands with different particle sizes, which are respectively 30-45 meshes, 45-100 meshes and 100-150 meshes, and the proportion of the three is 2:4: 1.
further, the water reducing agent is a polycarboxylic acid or naphthalene high-efficiency water reducing agent.
Further, the basalt fiber is a chopped basalt fiber with the diameter of about 15 μm and the length of 20 mm.
According to the invention, quartz sand is adopted to replace coarse aggregate in common concrete, so that the concrete has a microstructure different from that of the common concrete, and due to the filling effect and the catalytic effect of the active powder material, the pore structure of the concrete is improved, the compactness is improved, the ice water content is reduced, and the freeze-thaw damage response of the concrete caused by the freezing expansion of pore water is reduced; the density of the basalt fiber active powder concrete is improved, the impermeability of the basalt fiber active powder concrete is improved, and the permeability coefficient is low, so that the invasion of external water and chloride ions in a snow-melting agent and the migration of water in the concrete are inhibited, and the capillary pores in the concrete are difficult to reach the critical saturation required by freeze-thaw cycle damage; the basalt fibers randomly distributed in the concrete have a micro-reinforcing effect, play a role in limiting shrinkage, resisting cracking, increasing toughness and the like on the concrete, reduce the size and the number of crack sources, limit development and relieve stress concentration at the tips of cracks in a freeze-thaw cycle process, so that the frost resistance of the concrete is obviously improved.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the quartz sand is used as the aggregate, the internal structure is more compact, the gaps are more tiny and are not communicated with each other, the concrete is not easy to be corroded by the outside, and the chloride ion corrosion resistance of the concrete is improved.
2. The invention is in the production processLittle cement, CO2The discharge amount is small, and the environmental protection requirement is met; the raw material for producing basalt fiber is taken from natural volcanic rock, and the basalt fiber can be called as green fiber.
3. The basalt fiber doped in the invention and the concrete are silicate materials, and the basalt fiber and the concrete have natural compatibility, so that the basalt fiber can be more easily and uniformly dispersed in the concrete. The basalt fiber can inhibit the development of concrete cracks and reduce water entering the concrete under the action of micro reinforcement on the concrete, so that the frost resistance of the concrete is obviously improved.
Detailed Description
The materials used in the examples of the invention are as follows:
cement: P.O 42.5 grade ordinary portland cement produced by Changchun certain factory is adopted.
Quartz sand: the quartz sand produced by a certain Luoyang factory is sieved and then evenly mixed according to the proportion of 2:4:1, wherein the particle size of the quartz sand is 30-45 meshes, 45-100 meshes and 100-150 meshes.
Silica fume: SF92 type silica fume produced by Changchun factory is used.
Basalt fiber: chopped basalt fibers produced by a certain factory in Zhejiang province are adopted, the diameter is 23 mu m, and the length is 22 mm.
Water reducing agent: adopts HPWR-Q8011 type polycarboxylate superplasticizer produced by a certain factory in Shaanxi.
Example 1:
the basalt fiber active powder concrete suitable for the seasonal freezing area is prepared from the following raw materials in parts by weight: 834 parts of cement, 208 parts of silica fume, 939 parts of quartz sand, 166 parts of water, 52 parts of a water reducing agent and 4 parts of basalt fiber.
Example 2:
the basalt fiber active powder concrete suitable for the seasonal freezing area comprises the following raw materials in parts by weight: 820 parts of cement, 210 parts of silica fume, 932 parts of quartz sand, 160 parts of water, 53 parts of a water reducing agent and 8 parts of basalt fiber;
example 3:
the basalt fiber active powder concrete suitable for the seasonal freezing area comprises the following raw materials in parts by weight: 854 parts of cement, 198 parts of silica fume, 950 parts of quartz sand, 171 parts of water, 51 parts of a water reducing agent and 12 parts of basalt fiber;
comparative example 1:
the basalt fiber active powder concrete suitable for the seasonal freezing area comprises the following raw materials in parts by weight: 834 parts of cement, 208 parts of silica fume, 939 parts of quartz sand, 166 parts of water and 52 parts of a water reducing agent;
comparative example 2:
the basalt fiber active powder concrete suitable for the seasonal freezing area comprises the following raw materials in parts by weight: 814 parts of cement, 220 parts of silica fume, 940 parts of quartz sand, 169 parts of water, 51 parts of a water reducing agent and 78 parts of steel fiber;
the steel fiber in comparative example 2 has a length of 18mm and a diameter of 220 μm, and meets the standard requirements of reactive powder concrete (GB/T31387-2015).
And (3) performance testing:
by combining the specification requirements of a cement mortar strength test method (GBT17671-1999) and a standard of a test method for long-term performance and endurance performance of ordinary concrete (GB/T50082-2009), the basalt fiber active powder concrete applicable to the seasonal freezing zone, which is obtained in the above examples 1-3 and comparative examples 1-2, is subjected to vibration molding in a 40mm × 40mm × 160mm test mold and steam curing for 48h under consideration that the active powder concrete itself has high strength and may exceed the range of experimental instruments in a mechanical test process.
According to the standard requirements of active powder concrete (GB/T31387-2015) and the standard requirements of a common concrete long-term performance and endurance test method (GB/T50082-2009), the basalt fiber active powder concrete applicable to the seasonal freezing area obtained in the above examples 1-3 and comparative examples 1-2 is subjected to a freezing-thawing cycle test, in order to simulate the state of the concrete in the seasonal freezing area environment, clear water in the freezing-thawing cycle test is replaced by a NaCl solution with the mass fraction of 5% to simulate the erosion action of chloride ions on the concrete after the snow melting agent is melted, the performance of the concrete under the chloride-salt freezing-thawing coupling action is tested, the frost resistance of the concrete is characterized by the mass loss rate and the relative dynamic elastic modulus, and the results are shown in tables 1 and 2.
Table 1: concrete quality loss rate (%) -based on chloride-freeze-thaw coupling
The concrete quality loss rate is one of the criteria for evaluating the frost resistance of concrete. In a 5% NaCl solution, the quality of different types of active powder concrete shows a trend of descending-ascending-descending along with the increase of the number of freeze-thaw cycles, the mass loss rate of the basalt fiber active powder concrete suitable for the seasonal freezing area under the action of 100 times of chloride salt-freeze-thaw coupling obtained in the examples 1, 2 and 3 is obviously lower than that of the concrete in the comparative examples 1-2, and the test results show that the basalt fiber active powder concrete is more suitable for the environment of the chloride salt-freeze-thaw coupling in the seasonal freezing area.
Table 2: concrete relative dynamic elastic modulus (%) -under chloride-freeze thawing coupling action
The relative dynamic elastic modulus of the concrete is also one of the standards for evaluating the frost resistance of the concrete, and the relative dynamic elastic modulus of the basalt fiber active powder concrete suitable for the seasonal freezing area obtained in the examples 1, 2 and 3 under the action of 100-800 times chloride salt-freeze-thaw coupling is larger than that of the concrete in the comparative examples 1-2. From the test results, the basalt fiber active powder concrete is more suitable for the environment with the chloride-freeze thawing coupling action in seasonal freezing areas.
Through analysis of test results of concrete mass loss rate and relative dynamic elastic modulus, the improvement of the frost resistance of the active powder concrete by the doping of the steel fiber is smaller than that of the basalt fiber, because the steel fiber is a rigid fiber, is difficult to disperse uniformly in the concrete and is caused by the characteristic of easy corrosion, and the basalt fiber belongs to a flexible fiber, has low elastic modulus and small fiber rigidity, and although the load transfer capability is weaker than that of the steel fiber, because the density of the basalt fiber is small and fine, and the excellent dispersion is favorable for enhancing the continuity of a medium and improving the inherent homogeneity of the concrete, the frost resistance is better under the chloride-freeze-thaw coupling effect, and the concrete is more suitable for seasonal freezing areas.
It should be noted that, when the present invention relates to numerical ranges, it is to be understood that two endpoints of each numerical range and any value between the two endpoints can be selected, and since the steps and methods adopted are the same as those in embodiments 1 to 3, the present invention describes a preferred embodiment in order to prevent redundancy.
Claims (6)
1. The utility model provides a basalt fiber active powder concrete suitable for seasonally frozen district which characterized in that: the material comprises the following raw materials in parts by weight: 814-854 parts of cement, 198-220 parts of silica fume, 901-950 parts of quartz sand, 159-171 parts of water, 51-53 parts of a water reducing agent and 4-12 parts of basalt fiber.
2. The basalt fiber reactive powder concrete suitable for use in seasonal freezing zones according to claim 1, wherein: the cement is P.O 42.5 grade ordinary portland cement.
3. The basalt fiber reactive powder concrete suitable for use in seasonal freezing zones according to claim 1, wherein: the mass fraction of the silica fume is 93.3 percent, and the density is 2.12g/cm3Specific surface area of 18100m2/kg。
4. The basalt fiber reactive powder concrete suitable for use in seasonal freezing zones according to claim 1, wherein: the quartz sand is a mixture of three quartz sands with different particle sizes, wherein the three quartz sands are respectively 30-45 meshes, 45-100 meshes and 100-150 meshes, and the proportion of the three is 2:4: 1.
5. the basalt fiber reactive powder concrete suitable for use in seasonal freezing zones according to claim 1, wherein: the water reducing agent is a polycarboxylic acid or naphthalene high-efficiency water reducing agent.
6. The basalt fiber reactive powder concrete suitable for use in seasonal freezing zones according to claim 1, wherein: the length of the basalt fiber is 20mm, and the diameter of the basalt fiber is 15 mu m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010976654.3A CN112028578A (en) | 2020-09-17 | 2020-09-17 | Basalt fiber active powder concrete suitable for seasonal freezing area |
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| CN202010976654.3A CN112028578A (en) | 2020-09-17 | 2020-09-17 | Basalt fiber active powder concrete suitable for seasonal freezing area |
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| CN112028578A true CN112028578A (en) | 2020-12-04 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114620971A (en) * | 2022-02-14 | 2022-06-14 | 新沂市新南环保产业技术研究院有限公司 | Concrete containing silica fume and preparation equipment thereof |
| CN116003034A (en) * | 2023-01-16 | 2023-04-25 | 长春工程学院 | Basalt fiber pervious concrete material for quaternary frozen area and preparation method thereof |
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| RU2480428C1 (en) * | 2011-11-03 | 2013-04-27 | федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Волгоградский государственный архитектурно-строительный университет" (ВолгГАСУ) | Concrete mixture |
| CN103508713A (en) * | 2013-09-03 | 2014-01-15 | 北京交通大学 | Basalt fiber-reinforced active powder concrete and preparation method thereof |
| CN109678417A (en) * | 2018-12-19 | 2019-04-26 | 深圳供电局有限公司 | High-durability Reactive Powder Concrete, pile foundation and preparation method thereof |
-
2020
- 2020-09-17 CN CN202010976654.3A patent/CN112028578A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2480428C1 (en) * | 2011-11-03 | 2013-04-27 | федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Волгоградский государственный архитектурно-строительный университет" (ВолгГАСУ) | Concrete mixture |
| CN103508713A (en) * | 2013-09-03 | 2014-01-15 | 北京交通大学 | Basalt fiber-reinforced active powder concrete and preparation method thereof |
| CN109678417A (en) * | 2018-12-19 | 2019-04-26 | 深圳供电局有限公司 | High-durability Reactive Powder Concrete, pile foundation and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114620971A (en) * | 2022-02-14 | 2022-06-14 | 新沂市新南环保产业技术研究院有限公司 | Concrete containing silica fume and preparation equipment thereof |
| CN116003034A (en) * | 2023-01-16 | 2023-04-25 | 长春工程学院 | Basalt fiber pervious concrete material for quaternary frozen area and preparation method thereof |
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