CN113307578A - Multifunctional UHPC and preparation method thereof - Google Patents
Multifunctional UHPC and preparation method thereof Download PDFInfo
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- CN113307578A CN113307578A CN202110708108.6A CN202110708108A CN113307578A CN 113307578 A CN113307578 A CN 113307578A CN 202110708108 A CN202110708108 A CN 202110708108A CN 113307578 A CN113307578 A CN 113307578A
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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
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
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- Curing Cements, Concrete, And Artificial Stone (AREA)
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Abstract
The invention discloses a multifunctional UHPC and a preparation method thereof. The multifunctional UHPC comprises: 100 parts of cement, 8-25 parts of silica fume, 0-15 parts of fly ash, 80-120 parts of sand, 5-30 parts of quartz powder, 2-6 parts of fiber, 1-8 parts of high-performance water reducing agent, 7-12 parts of expanding agent, 0-1.5 parts of SAP super absorbent resin, 0-10 parts of automobile exhaust absorbing material, 0-24 parts of internal-doped snow melting agent and 0.15-0.23 of water-to-glue ratio. The UHPC material prepared by the invention has the advantages of self-compaction, no steam curing, ultrahigh strength, ultrahigh toughness, strong freezing resistance, lower 28-day self-shrinkage rate, excellent cracking resistance and capability of absorbing automobile exhaust in cities or traffic roads. The method can be widely applied to the projects of repairing the defects of the cement bridge deck, treating the expansion joints of the bridge deck, preventing the water of the cement bridge deck, repairing the cement piers, paving the steel bridge deck with durability and the like.
Description
Technical Field
The invention relates to a civil engineering material and a preparation method thereof, in particular to a multifunctional UHPC and a preparation method thereof.
Background
The ultra-high performance concrete (UHPC for short) is a cement-based composite material with the optimal particle composition of the constituent materials, contains a certain proportion of superfine short steel fibers or organic fiber reinforced materials, has better toughness under a tensile state, and has higher strength and durability compared with common concrete and High Performance Concrete (HPC). The UHPC ultrahigh-performance concrete has the tensile strength of not less than 5MPa (UT05 grade), the residual tensile strength of not less than 3.5MPa and the compressive strength of not less than 120MPa (UC120 grade) when the tensile deformation reaches 0.15 percent. The material is a civil engineering material with excellent performance, and can be widely applied to projects such as cement bridge deck defect repair, bridge deck expansion joint treatment, cement bridge deck waterproofing, cement pier repair, steel bridge deck durable pavement and the like.
Chinese patent CN108609974A proposes a preparation method of UHPC, wherein the powder material of UHPC comprises the following components: 40-50 parts of Portland cement, 20-30 parts of sulphoaluminate rapid-hardening cement, 5-10 parts of silica fume, 15-20 parts of fly ash, 15-20 parts of mineral powder, 30-50 parts of quartz sand, 30-50 parts of quartz powder and 0.2-2.5 parts of latex powder, but the problems of too viscous mixture, bottom sticking, difficult construction and the like exist in the technology, Chinese patent CN109369118A provides a low-shrinkage ultrahigh-performance concrete and a preparation method, wherein the main innovation is that the added high-water-absorption resin well solves the problem of large early shrinkage of UHPC, but the problems of high requirement on construction equipment and single function exist. Therefore, it is urgently needed to develop a multifunctional UHPC to solve the problem of single performance of cement concrete.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a multifunctional UHPC and a preparation method thereof.
The technical scheme is as follows: the invention provides a multifunctional UHPC and a preparation method thereof, wherein the multifunctional UHPC comprises the following components in parts by weight: 100 parts of cement, 8-25 parts of silica fume, 0-15 parts of fly ash, 80-120 parts of sand, 5-30 parts of quartz powder, 2-6 parts of fiber, 1-8 parts of high-performance water reducing agent, 7-12 parts of expanding agent, 0-1.5 parts of SAP super absorbent resin, 0-10 parts of automobile exhaust absorbing material, 0-24 parts of internal-doped snow melting agent and 0.15-0.23 of water-to-glue ratio.
Further, the cement is superfine 42.5 cement, evergreen brand cement with the grade of 52.5, foreign house brand cement with the grade of 52.5, conch brand cement with the grade of 52.5, portland cement with the grade of 52.5 and small open field cement with the grade of 52.5; the specific Bosch surface area of the cement is not less than 1000m2Per kg, an average particle diameter of not more than 6 μm and a median particle diameter D50 of not more than 7 μm.
Further, the silica fume is original-state silica fume, semi-densified silica fume, zirconium silica fume and white silica fume; the silica fume is first-grade ash, the silicon content is more than 92%, the water demand is less than 120%, the activity index is not less than 110%, and the average particle size is 0.1-0.15 mu m.
Further, the sand is quartz sand or river sand; the particle size of the quartz sand is 0.2-0.4 mm, and the particle size of the river sand is 0.075-2.36 mm.
Further, the content of the fly ash is not less than 90% of spherical micro-beads, the fineness is not less than 1200 meshes, and the loss on ignition is less than 2%.
Further, the quartz powder is 325 mesh quartz powder, and the average particle size is 50.1 μm.
Further, the fiber is copper-plated micro-wire fiber, the tensile strength of the fiber is not less than 2900, and the Young modulus of the fiber is not less than 50 GPa; the PVA fiber is not less than 1300MPa, and the Young modulus is not less than 7 GPa; the tensile strength of the aramid short fiber is not less than 3050, and the Young modulus is not less than 4.3 GPa; high-strength high-modulus polyethylene fiber.
Further, the high-performance water reducing agent is a basf Melflux4930F polycarboxylate water reducing agent, a Subot polycarboxylate water reducing agent, a gatoda polycarboxylate water reducing agent, a Jinteng chemical polycarboxylate water reducing agent, a Fumais PCE-11 polycarboxylate water reducing agent, a Yuze chemical polycarboxylate water reducing agent and a BST-301 polycarboxylate water reducing agent.
Further, the swelling agent is UEA-I swelling agent, TD-1 swelling agent, HEA-1 swelling agent and SJ-K swelling agent; the SAP super absorbent resin is WL-700, WL-800, WL-3000; the automobile exhaust absorption material is nano TiO2 and nano zirconium dioxide; the internal-doped snow-melting agent is a tracked II type slow-release antifreeze agent and a tracked I type slow-release antifreeze agent.
The preparation method of the multifunctional UHPC comprises the following steps:
(1) adding cement, silica fume, fly ash, sand, quartz powder, fiber, an expanding agent, SAP (super absorbent polymer), an automobile exhaust absorbing material and an internal-doped snow-melting agent into a concrete mixer according to the proportion and mixing for 1-2 min to obtain a mixture (1);
(2) adding the fibers into the material (1), and stirring for 3-4 min to be uniform to obtain a mixture (2);
(3) and mixing the compounded high-efficiency water reducing agent and water into uniform mixed liquid, adding half of the mixed liquid in a concrete mixer under the stirring state, and stirring for 6-8 min to obtain the multifunctional UHPC.
Has the advantages that: the multifunctional UHPC is simple in preparation method and process; the prepared UHPC material has the advantages of self-compaction, no steam curing, ultrahigh strength, ultrahigh toughness, strong freezing resistance, lower 28-day self-shrinkage rate, excellent cracking resistance, capability of absorbing automobile exhaust on cities or traffic roads and excellent comprehensive performance.
Detailed Description
The performance detection method of UHPC refers to the technical requirement of Ultra High Performance Concrete (UHPC) (the standards of the institute of engineering and building standardization of China, T/CECS xxx-202 xxx).
Example 1
UHPC preparation:
(1) adding cement, silica fume, fly ash, sand, quartz powder, fiber, an expanding agent, SAP (super absorbent polymer), an automobile exhaust absorbing material and an internal-doped snow-melting agent into a concrete mixer according to the proportion and mixing for 1-2 min to obtain a mixture (1);
(2) adding the fibers into the material (1), and stirring for 3-4 min to be uniform to obtain a mixture (2);
(3) and mixing the compounded high-efficiency water reducing agent and water into uniform mixed liquid, adding half of the mixed liquid in a concrete mixer under the stirring state, and stirring for 6-8 min to obtain the multifunctional UHPC.
Comparative example experiment:
taking UHPC dry powder produced and sold by a certain well-known company on the market in China, preparing UHPC concrete according to the proportioning requirement required by manufacturers as a comparative example, wherein the specific comparative properties are as follows:
TABLE 1 major Performance parameters of the Multifuntional UHPC prepared in example 1
Example 2
UHPC preparation:
(1) adding cement, silica fume, fly ash, sand, quartz powder, fiber, an expanding agent, SAP (super absorbent polymer), an automobile exhaust absorbing material and an internal-doped snow-melting agent into a concrete mixer according to the proportion and mixing for 1-2 min to obtain a mixture (1);
(2) adding the fibers into the material (1), and stirring for 3-4 min to be uniform to obtain a mixture (2);
(3) and mixing the compounded high-efficiency water reducing agent and water into uniform mixed liquid, adding half of the mixed liquid in a concrete mixer under the stirring state, and stirring for 6-8 min to obtain the multifunctional UHPC.
Comparative example experiment:
taking UHPC dry powder produced and sold by a certain Shanghai company, preparing UHPC concrete according to the proportioning requirement of manufacturers as a comparative example, wherein the specific comparative properties are as follows:
TABLE 2 major Performance parameters for the Multifuntional UHPC prepared in example 2
Example 3
UHPC preparation:
(1) adding cement, silica fume, fly ash, sand, quartz powder, fiber, an expanding agent, SAP (super absorbent polymer), an automobile exhaust absorbing material and an internal-doped snow-melting agent into a concrete mixer according to the proportion and mixing for 1-2 min to obtain a mixture (1);
(2) adding the fibers into the material (1), and stirring for 3-4 min to be uniform to obtain a mixture (2);
(3) and mixing the compounded high-efficiency water reducing agent and water into uniform mixed liquid, adding half of the mixed liquid in a concrete mixer under the stirring state, and stirring for 6-8 min to obtain the multifunctional UHPC.
Comparative example experiment:
taking UHPC dry powder produced and sold by a certain Shanghai company, preparing UHPC concrete according to the proportioning requirement of manufacturers as a comparative example, wherein the specific comparative properties are as follows:
TABLE 3 major Performance parameters for the Multifuntional UHPC prepared in example 3
Example 4
UHPC preparation:
(1) adding cement, silica fume, fly ash, sand, quartz powder, fiber, an expanding agent, SAP (super absorbent polymer), an automobile exhaust absorbing material and an internal-doped snow-melting agent into a concrete mixer according to the proportion and mixing for 1-2 min to obtain a mixture (1);
(2) adding the fibers into the material (1), and stirring for 3-4 min to be uniform to obtain a mixture (2);
(3) and mixing the compounded high-efficiency water reducing agent and water into uniform mixed liquid, adding half of the mixed liquid in a concrete mixer under the stirring state, and stirring for 6-8 min to obtain the multifunctional UHPC.
Comparative example experiment:
taking UHPC dry powder produced and sold by a certain Shanghai company, preparing UHPC concrete according to the proportioning requirement of manufacturers as a comparative example, wherein the specific comparative properties are as follows:
TABLE 4 major Performance parameters for the Multifuntional UHPC prepared in example 4
Example 5
UHPC preparation:
(1) adding cement, silica fume, fly ash, sand, quartz powder, fiber, an expanding agent, SAP (super absorbent polymer), an automobile exhaust absorbing material and an internal-doped snow-melting agent into a concrete mixer according to the proportion and mixing for 1-2 min to obtain a mixture (1);
(2) adding the fibers into the material (1), and stirring for 3-4 min to be uniform to obtain a mixture (2);
(3) and mixing the compounded high-efficiency water reducing agent and water into uniform mixed liquid, adding half of the mixed liquid in a concrete mixer under the stirring state, and stirring for 6-8 min to obtain the multifunctional UHPC.
Comparative example experiment:
taking UHPC dry powder produced and sold by a certain Shanghai company, preparing UHPC concrete according to the proportioning requirement of manufacturers as a comparative example, wherein the specific comparative properties are as follows:
TABLE 5 major Performance parameters for the Multifuntional UHPC prepared in example 5
Example 6
UHPC preparation:
(1) adding cement, silica fume, fly ash, sand, quartz powder, fiber, an expanding agent, SAP (super absorbent polymer), an automobile exhaust absorbing material and an internal-doped snow-melting agent into a concrete mixer according to the proportion and mixing for 1-2 min to obtain a mixture (1);
(2) adding the fibers into the material (1), and stirring for 3-4 min to be uniform to obtain a mixture (2);
(3) and mixing the compounded high-efficiency water reducing agent and water into uniform mixed liquid, adding half of the mixed liquid in a concrete mixer under the stirring state, and stirring for 6-8 min to obtain the multifunctional UHPC.
Comparative example experiment:
taking UHPC dry powder produced and sold by a certain Shanghai company, preparing UHPC concrete according to the proportioning requirement of manufacturers as a comparative example, wherein the specific comparative properties are as follows:
TABLE 6 UHPC Multifuntional form prepared in example 6 Main Performance parameters
Example 7
UHPC preparation:
(1) adding cement, silica fume, fly ash, sand, quartz powder, fiber, an expanding agent, SAP (super absorbent polymer), an automobile exhaust absorbing material and an internal-doped snow-melting agent into a concrete mixer according to the proportion and mixing for 1-2 min to obtain a mixture (1);
(2) adding the fibers into the material (1), and stirring for 3-4 min to be uniform to obtain a mixture (2);
(3) and mixing the compounded high-efficiency water reducing agent and water into uniform mixed liquid, adding half of the mixed liquid in a concrete mixer under the stirring state, and stirring for 6-8 min to obtain the multifunctional UHPC.
Comparative example experiment:
taking UHPC dry powder produced and sold by a certain Shanghai company, preparing UHPC concrete according to the proportioning requirement of manufacturers as a comparative example, wherein the specific comparative properties are as follows:
TABLE 7 UHPC Multifuntional form prepared in example 7 the main performance parameters
From the detection data of the specific examples given in examples 1-7, it can be seen that the performance of the multifunctional UHPC exceeds the level of a certain well-known manufacturer in China, especially the multifunctional UHPC has ultrahigh toughness, strong anti-icing capability, low 28-day self-contraction rate, excellent anti-cracking performance and can absorb automobile exhaust in cities or traffic roads.
Claims (10)
1. A multifunctional UHPC is characterized in that: the composition comprises the following components in parts by weight: 100 parts of cement, 8-25 parts of silica fume, 0-15 parts of fly ash, 80-120 parts of sand, 5-30 parts of quartz powder, 2-6 parts of fiber, 1-8 parts of high-performance water reducing agent, 7-12 parts of expanding agent, 0-1.5 parts of SAP super absorbent resin, 0-10 parts of automobile exhaust absorbing material, 0-24 parts of internal-doped snow melting agent and 0.15-0.23 of water-to-glue ratio.
2. The UHPC of claim 1, wherein: the cement is superfine 42.5 cement, evergreen brand cement with the grade of 52.5, foreign house brand cement with the grade of 52.5, trumpet brand cement with the grade of 52.5, portland cement with the grade of 52.5 and small open-air field cement with the grade of 52.5; the specific Bosch surface area of the cement is not less than 1000m2Per kg, an average particle diameter of not more than 6 μm and a median particle diameter D50 of not more than 7 μm.
3. The UHPC of claim 1, wherein: the silica fume is original silica fume, semi-densified silica fume, zirconium silica fume and white silica fume; the silica fume is first-grade ash, the silicon content is more than 92%, the water demand is less than 120%, the activity index is not less than 110%, and the average particle size is 0.1-0.15 mu m.
4. The UHPC of claim 1, wherein: the sand is quartz sand or river sand; the particle size of the quartz sand is 0.2-0.4 mm, and the particle size of the river sand is 0.075-2.36 mm.
5. The UHPC of claim 1, wherein: the content of the fly ash is not less than 90 percent of the spherical micro-beads, the fineness is not less than 1200 meshes, and the ignition loss is less than 2 percent.
6. The UHPC of claim 1, wherein: the quartz powder is 325-mesh quartz powder, and the average particle size is 50.1 mu m.
7. The UHPC of claim 1, wherein: the fiber is copper-plated micro-wire fiber, the tensile strength of the fiber is not less than 2900, and the Young modulus of the fiber is not less than 50 GPa; the PVA fiber is not less than 1300MPa, and the Young modulus is not less than 7 GPa; the tensile strength of the aramid short fiber is not less than 3050, and the Young modulus is not less than 4.3 GPa; high-strength high-modulus polyethylene fiber.
8. The UHPC of claim 1, wherein: the high-performance water reducing agent is a Pasteur Melflux4930F polycarboxylate water reducing agent, a Subot polycarboxylate water reducing agent, a Gattoda polycarboxylate water reducing agent, a Jinteng chemical polycarboxylate water reducing agent, a Fumeisi PCE-11 polycarboxylate water reducing agent, a Yuze chemical polycarboxylate water reducing agent and a BST-301 polycarboxylate water reducing agent.
9. The UHPC of claim 1, wherein: the swelling agent is UEA-I swelling agent, TD-1 swelling agent, HEA-1 swelling agent and SJ-K swelling agent; the SAP super absorbent resin is WL-700, WL-800, WL-3000; the automobile exhaust absorption material is nano TiO2 and nano zirconium dioxide; the internal-doped snow-melting agent is a tracked II type slow-release antifreeze agent and a tracked I type slow-release antifreeze agent.
10. A process for the preparation of a multifunctional UHPC according to claim 1, characterized in that: the method comprises the following steps:
(1) adding cement, silica fume, fly ash, sand, quartz powder, fiber, an expanding agent, SAP (super absorbent polymer), an automobile exhaust absorbing material and an internal-doped snow-melting agent into a concrete mixer according to the proportion and mixing for 1-2 min to obtain a mixture (1);
(2) adding the fibers into the material (1), and stirring for 3-4 min to be uniform to obtain a mixture (2);
(3) and mixing the compounded high-efficiency water reducing agent and water into uniform mixed liquid, adding half of the mixed liquid in a concrete mixer under the stirring state, and stirring for 6-8 min to obtain the multifunctional UHPC.
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Cited By (1)
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