CN115368074B - Light shrinkage-reducing anti-cracking ultra-high performance concrete and preparation method thereof - Google Patents
Light shrinkage-reducing anti-cracking ultra-high performance concrete and preparation method thereof Download PDFInfo
- Publication number
- CN115368074B CN115368074B CN202210946450.4A CN202210946450A CN115368074B CN 115368074 B CN115368074 B CN 115368074B CN 202210946450 A CN202210946450 A CN 202210946450A CN 115368074 B CN115368074 B CN 115368074B
- Authority
- CN
- China
- Prior art keywords
- water
- weight
- parts
- stirring
- microbeads
- 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
Classifications
-
- 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
- C04B14/08—Diatomaceous earth
-
- 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
- C04B14/22—Glass ; Devitrified glass
- C04B14/24—Glass ; Devitrified glass porous, e.g. foamed glass
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
- C04B18/08—Flue dust, i.e. fly ash
- C04B18/082—Cenospheres
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/146—Silica fume
-
- 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
-
- 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
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Combustion & Propulsion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a lightweight shrinkage-reducing anti-crack ultra-high performance concrete (UHPC) and a preparation method thereof, which is prepared by taking common Portland cement, fly ash microbeads, vitrified microbeads, silica fume, diatomite, sand, steel fibers and the like as raw materials through stirring. The invention utilizes the characteristics of light weight, high cylinder pressure and better water absorption of the vitrified microbeads to reduce the dead weight of UHPC, ensure the mechanical property of UHPC and restrict and inhibit the shrinkage of UHPC to a certain extent; the diatomite has the characteristics of porous, high specific surface area and high volcanic ash activity, also has a certain internal curing function, can reduce the shrinkage of UHPC, reduce the early cracking risk, and can also exert the filling effect and the volcanic ash effect to ensure the stable development of the strength of UHPC. Therefore, the ultra-high performance concrete prepared by the method has good working performance and mechanical performance while reducing dead weight, reducing shrinkage and improving crack resistance, and has excellent application prospect.
Description
Technical Field
The invention belongs to the field of building materials, and particularly relates to light shrinkage-reducing anti-cracking ultra-high performance concrete and a preparation method thereof.
Background
Ultra-high performance concrete (Ultra-High Performance Concrete, UHPC) has Ultra-high strength and high toughness and durability, can meet the development of modern engineering structures in a higher, longer and deeper direction, is suitable for use in various severe environments, and has become research hot spots and leading edge technologies of civil engineering. Because UHPC has the characteristics of very low water-gel ratio (0.14-0.19), high cementing material content, high active mineral admixture content, low coarse aggregate content and the like, the shrinkage characteristic of UHPC is greatly different from that of common concrete and high-performance concrete, and the UHPC is usually accompanied by larger self-shrinkage in the service process after setting and hardening, has high early cracking risk, and becomes one of technical bottlenecks limiting engineering application and popularization of UHPC materials at present. As is evident from the statistics of a large number of documents, the shrinkage of UHPC is mainly self-shrinkage and accounts for 78.6% -90.0% of the total shrinkage. Therefore, reducing UHPC self-shrinkage is critical to reducing UHPC cracking risk, ensuring its applicability and safety in structural applications.
Based on the analysis, the invention provides a light shrinkage-reducing crack-resistant ultra-high performance concrete prepared by externally doping a proper amount of vitrified microbeads and diatomite into UHPC, and the incorporation of the vitrified microbeads and the diatomite into the UHPC has the following advantages: 1) The vitrified microbeads are used for partially replacing sand, the weight of UHPC dead weight can be reduced to a certain extent due to the light material characteristics, the aggregate effect can be realized due to the high-rigidity material characteristics, and the mechanical property of UHPC is ensured; 2) Diatomite is a natural volcanic ash material, the main mineral component of the diatomite is amorphous silicon dioxide, and the diatomite can react with calcium hydroxide generated by cement hydration to generate more gelled substances, so that the strength of UHPC is ensured to develop stably; 3) The vitrified microbeads have excellent water absorption and diatomite porous and high specific surface area material characteristics, and have certain internal curing function, and the water holding and releasing effects of the two materials can delay the reduction rate of relative humidity in UHPC, inhibit self-shrinkage of UHPC and reduce early cracking risk. At present, the self-shrinkage of UHPC is inhibited by adding vitrified microbeads and diatomite to the UHPC, which is reported in the related literature. Therefore, the lightweight shrinkage-reducing anti-crack ultra-high performance concrete prepared based on the doping of a proper amount of vitrified microbeads and diatomite is expected to break through the technical bottleneck of limiting the practical application of UHPC due to large self shrinkage.
Disclosure of Invention
The invention aims to prepare the light shrinkage-reducing anti-cracking ultra-high performance concrete with light weight, stable strength development, small self-contraction, high volume stability and low early anti-cracking risk by utilizing the material characteristics of the vitrified microbeads, such as light weight, high rigidity and better water absorbability, and the pozzolanic activity and water-holding and water-releasing material characteristics of diatomite.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a light shrinkage-reducing anti-crack ultra-high performance concrete is prepared from ordinary Portland cement, fly ash microbeads, silica fume, diatomite, sand, steel fibers, a water reducer and water; the raw materials are used in the following parts by weight:
100 parts of ordinary Portland cement,
5-20 parts of fly ash microbeads,
10-30 parts of vitrified microbeads,
10-30 parts of silica fume,
5-20 parts of diatomite,
80-150 parts of sand,
30-150 parts of steel fiber,
2-5 parts of a water reducing agent,
15-30 parts of water.
Further, the Portland cement is specifically 42.5-grade Portland cement or 52.5-grade Portland cement.
Further, the fly ash microbeads are obtained by sorting fly ash, and the apparent density of the fly ash microbeads is less than 1000 kg/m 3 The average particle diameter is 1-3 μm.
Further, the bulk density of the vitrified microbeads is 300-310 kg/m 3 The surface vitrification closed pore rate is more than or equal to 80%, the water absorption rate is less than or equal to 60%, the barrel pressure strength is more than or equal to 200 Kpa, and the average grain diameter is 0.15-0.18 mm.
Further, the specific surface area of the silica fume is more than or equal to 1500 m 2 Per kg, an average particle diameter of 0.1 to 0.2 μm, wherein SiO 2 The content is more than or equal to 90 percent.
Further, the mesh number of the diatomite ranges from 200 meshes to 400 meshes, wherein SiO 2 The content is more than or equal to 70 percent, the impurity content is less than or equal to 20 percent, and the types of the diatomite filter aid include but are not limited to diatomite raw soil, calcined diatomite, fluxing calcined diatomite filter aid and waste diatomite filter aid.
Further, the sand is quartz sand, and the mesh number of the sand is 10-20.
Further, the density of the steel fiber is 7400~8000 kg/m 3 The diameter is 0.2-0.4 mm, the length is 12-15 mm, the cross section is round or rectangular, the appearance is flat or wavy, and the breaking strength is not less than 2460 MPa.
Further, the water reducer is a powdery polycarboxylic acid high-performance water reducer or a naphthalene high-performance water reducer, the water content is less than or equal to 4%, and the water reduction rate is 16-35%.
Further, the water meets the requirements of the concrete water Standard (JGJ 63-2006).
The preparation method of the light shrinkage-reducing anti-cracking ultra-high performance concrete comprises the following steps:
(1) Respectively weighing the raw material components according to the proportion;
(2) Pouring sand and water accounting for 25% of the raw materials into a stirring pot, and stirring for 2 minutes;
(3) Pouring ordinary Portland cement, fly ash microbeads, silica fume and diatomite into a stirring pot, and stirring for 4 minutes; then adding the vitrified microbeads, and continuously stirring for 2 minutes;
(4) Pouring the water reducer and the rest of water into a stirring pot, stirring for 2-5 minutes, and taking a slurry shape;
(5) And finally pouring the steel fibers into a stirring pot, stirring for 3 minutes, filling the steel fibers into a mold, forming the steel fibers, and removing the mold after 48 hours to perform standard curing (the temperature is constant at 20+/-2 ℃ and the relative humidity is more than or equal to 95%) or steam curing (the temperature is about 45 ℃ and the pressure is one standard atmosphere), thus obtaining the light shrinkage-reducing anti-crack ultra-high performance concrete.
The invention has the following advantages:
1. the vitrified microbead used by the invention is light in weight and high in rigidity, and partial substitution sand (substitution rate is about 10-40%) of the vitrified microbead is doped into UHPC, so that the self weight is reduced, and meanwhile, the aggregate effect is exerted, and the mechanical property of the UHPC is ensured.
2. The high-rigidity material characteristic of the vitrified microbead used by the invention can inhibit UHPC shrinkage, and meanwhile, the higher water absorption property of the vitrified microbead enables the vitrified microbead to have an internal maintenance function, and as the hydration water of the UHPC is continuously consumed, the water in the vitrified microbead is released, the rapid decline of the relative humidity in the UHPC can be relieved to a certain extent, the increase of the capillary pressure in the UHPC is effectively inhibited, and the self-shrinkage of the UHPC is further inhibited.
3. The diatomite used in the invention has a certain internal curing function for holding water and releasing water due to the material characteristics of a large number of ordered holes and high specific surface area, and is applied to UHPC, when the water in the UHPC is hydrated and consumed, the diatomite can release the water, so that the dropping rate of the relative humidity in the UHPC can be delayed to a certain extent, the capillary pressure in the UHPC can be effectively reduced, and the self-shrinkage of the UHPC can be further inhibited and the crack expansion can be reduced.
4. The diatomite used in the invention has smaller particle size, is mainly composed of amorphous silica, has higher volcanic ash activity, and can play a filling effect and a volcanic ash effect while reducing crack resistance when being externally doped into UHPC, thereby ensuring the stable development of the strength of UHPC.
5. The raw materials adopted by the invention comprise industrial waste residues (fly ash microbeads and silica fume) and have high weight occupation and remarkable environmental protection benefit. In addition, when the diatomite adopted is the waste diatomite filter aid, the waste diatomite filter aid is also beneficial to the absorption of industrial solid waste of waste diatomite filter aid in the food and pharmaceutical industries, so that the land resource waste and environmental pollution caused by the piling and discharging of the industrial waste residue are effectively solved, the cost is further reduced, and the environmental protection benefit and economic effect are more remarkable as a whole.
Detailed Description
The invention provides a light shrinkage-reducing anti-crack ultra-high performance concrete, which is prepared from ordinary Portland cement, fly ash microbeads, silica fume, diatomite, sand, steel fibers, a water reducing agent and water; the raw materials are used in the following parts by weight:
100 parts of ordinary Portland cement,
5-20 parts of fly ash microbeads,
5-20 parts of vitrified microbeads,
10-30 parts of silica fume,
5-20 parts of diatomite,
80-150 parts of sand,
30-150 parts of steel fiber,
2-5 parts of a water reducing agent,
15-30 parts of water.
Further, the Portland cement is specifically 42.5-grade Portland cement or 52.5-grade Portland cement.
Further, the fly ash microbeads are obtained by separating fly ash by a screen, and the apparent density of the fly ash microbeads is less than 1000 kg/m 3 The average particle diameter is 1-3 μm.
Further, the bulk density of the vitrified microbeads is 300-310 kg/m 3 The surface vitrification closed pore rate is more than or equal to 80%, the water absorption rate is less than or equal to 60%, the barrel pressure strength is more than or equal to 200 Kpa, and the average grain diameter is 0.15-0.18 mm.
Further, the specific surface area of the silica fume is more than or equal to 1500 m 2 Per kg, an average particle diameter of 0.1 to 0.2 μm, wherein SiO 2 The content is more than or equal to 90 percent.
Further, the mesh number of the diatomite ranges from 200 meshes to 400 meshes, wherein SiO 2 The content is more than or equal to 70 percent, the impurity content is less than or equal to 20 percent, and the types of the diatomite filter aid include but are not limited to diatomite raw soil, calcined diatomite, fluxing calcined diatomite filter aid and waste diatomite filter aid.
Further, the sand is quartz sand, and the mesh number of the sand is 10-20.
Further, the density of the steel fibers is 7400-8000 kg/m 3 The diameter is 0.2-0.4 mm, the length is 12-15 mm, the cross section is round or rectangular, the appearance is flat or wavy, and the breaking strength is not less than 2460 MPa.
Further, the water reducer is a powdery polycarboxylic acid high-performance water reducer or a naphthalene high-performance water reducer, the water content is less than or equal to 4%, and the water reduction rate is 16-35%.
Further, the water meets the requirements of the concrete water Standard (JGJ 63-2006).
The preparation method of the light shrinkage-reducing anti-cracking ultra-high performance concrete comprises the following steps:
(1) Respectively weighing the raw material components according to the proportion;
(2) Pouring sand and water accounting for 25% of the raw materials into a stirring pot, and stirring for 2 minutes;
(3) Pouring ordinary Portland cement, fly ash microbeads, silica fume and diatomite into a stirring pot, and stirring for 4 minutes; then adding the vitrified microbeads, and continuously stirring for 2 minutes;
(4) Pouring the water reducer and the rest of water into a stirring pot, stirring for 2-5 minutes, and taking a slurry shape;
(5) And finally pouring the steel fibers into a stirring pot, stirring for 3 minutes, die-filling and forming, and removing the die after 48 hours for standard curing or steam curing to obtain the light shrinkage-reducing anti-crack ultra-high performance concrete.
In order to make the contents of the present invention more easily understood, the technical scheme of the present invention will be further described with reference to the specific embodiments, but the present invention is not limited thereto.
Example 1
The light shrinkage-reducing anti-cracking ultra-high performance concrete consists of 100 parts by weight of ordinary Portland cement, 20 parts by weight of fly ash microbeads, 5 parts by weight of vitrified microbeads, 10 parts by weight of silica fume, 20 parts by weight of diatomite, 130 parts by weight of sand, 60 parts by weight of steel fibers, 2.5 parts by weight of water reducer and 15 parts by weight of water.
Wherein, the ordinary Portland cement is 42.5-grade ordinary Portland cement; the apparent density of the fly ash microbeads used is 800 kg/m 3 The average particle diameter was 2. Mu.m; the bulk density of the vitrified microbeads used was 310 kg/m 3 The glass has a closed porosity of 85%, a water absorption of 55%, a cylinder pressure of 240 Kpa and an average particle diameter of 0.16 and mm; siO of the silica fume used 2 95% by weight and a specific surface area of 1500 m 2 Kg, average particle size 0.1. Mu.m; the diatomite is diatomite raw soil with 300 meshes and SiO 2 The content is 85 percent, and the impurity content is 10 percent; the mesh number of the sand is 10-20 mesh; the density of the steel fibers used was 7600 kg/m 3 The diameter is 0.2 mm, the length is 12 mm, the cross section is circular, the appearance is straight, and the breaking strength is 2600 MPa; the water reducer is a powdery polycarboxylic acid high-performance water reducer, the water content is 2%, and the water reducing rate is 30%; the water meets the requirements of the concrete water Standard (JGJ 63-2006).
The preparation steps of the lightweight shrinkage-reducing anti-crack ultra-high performance concrete of the embodiment are as follows:
(1) Weighing the raw materials according to the proportion;
(2) Pouring sand and water accounting for 25% of the raw materials into a stirring pot, and stirring for 2 minutes;
(3) Pouring ordinary Portland cement, fly ash microbeads, silica fume and diatomite into a stirring pot, and stirring for 4 minutes; then pouring the vitrified microbeads into the mixture, and stirring for 2 minutes;
(4) Pouring the water reducer and the rest of water into a stirring pot, stirring for 2-5 minutes, and taking a slurry shape;
(5) And finally pouring the steel fibers into a stirring pot, stirring for 3 minutes, molding in a mold, and removing the mold after 48 hours for standard maintenance to obtain the light shrinkage-reducing anti-cracking ultra-high performance concrete.
Example 2
The light shrinkage-reducing anti-cracking ultra-high performance concrete consists of 100 parts by weight of ordinary Portland cement, 20 parts by weight of fly ash microbeads, 10 parts by weight of vitrified microbeads, 10 parts by weight of silica fume, 20 parts by weight of diatomite, 110 parts by weight of sand, 80 parts by weight of steel fibers, 3.5 parts by weight of water reducer and 20 parts by weight of water.
Wherein, the ordinary Portland cement is 42.5-grade ordinary Portland cement; the apparent density of the fly ash microbeads used is 800 kg/m 3 The average particle diameter was 2. Mu.m; the bulk density of the vitrified microbeads used was 310 kg/m 3 The glass has a closed porosity of 85%, a water absorption of 55%, a cylinder pressure of 240 Kpa and an average particle diameter of 0.16 and mm; siO of the silica fume used 2 95% by weight and a specific surface area of 1500 m 2 Kg, average particle size 0.1. Mu.m; the diatomite is calcined diatomite with 300 meshes and SiO 2 The content is 90 percent, and the impurity content is 8.5 percent; sand usedThe mesh number range is 10-20 meshes; the density of the steel fibers used was 7600 kg/m 3 The diameter is 0.2 mm, the length is 12 mm, the cross section is rectangular, the appearance is straight, and the breaking strength is 2700 MPa; the water reducer is a powdery polycarboxylic acid high-performance water reducer, the water content is 2%, and the water reducing rate is 30%; the water meets the requirements of the concrete water Standard (JGJ 63-2006).
The preparation steps of the lightweight shrinkage-reducing anti-crack ultra-high performance concrete of the embodiment are as follows:
(1) Weighing the raw materials according to the proportion;
(2) Pouring sand and water accounting for 25% of the raw materials into a stirring pot, and stirring for 2 minutes;
(3) Pouring ordinary Portland cement, fly ash microbeads, silica fume and diatomite into a stirring pot, and stirring for 4 minutes; then pouring the vitrified microbeads into the mixture, and stirring for 2 minutes;
(4) Pouring the water reducer and the rest of water into a stirring pot, stirring for 2-5 minutes, and taking a slurry shape;
(5) And finally pouring the steel fibers into a stirring pot, stirring for 3 minutes, molding in a mold, and removing the mold after 48 hours for standard maintenance to obtain the light shrinkage-reducing anti-cracking ultra-high performance concrete.
Example 3
The light shrinkage-reducing anti-cracking ultra-high performance concrete consists of 100 parts by weight of ordinary Portland cement, 20 parts by weight of fly ash microbeads, 15 parts by weight of vitrified microbeads, 10 parts by weight of silica fume, 20 parts by weight of diatomite, 90 parts by weight of sand, 100 parts by weight of steel fiber, 4.5 parts by weight of water reducer and 25 parts by weight of water.
Wherein, the ordinary Portland cement is 42.5-grade ordinary Portland cement; the apparent density of the fly ash microbeads used is 800 kg/m 3 The average particle diameter was 2. Mu.m; the bulk density of the vitrified microbeads used was 310 kg/m 3 The glass has a closed porosity of 85%, a water absorption of 55%, a cylinder pressure of 240 Kpa and an average particle diameter of 0.16 and mm; siO of the silica fume used 2 95% by weight and a specific surface area of 1500 m 2 Kg, average particle size 0.1. Mu.m; the diatomite is waste diatomite filter aid,the mesh number is 300 meshes, siO 2 The content is 95 percent, and the impurity content is 5 percent; the mesh number of the sand is 10-20 mesh; the density of the steel fibers used was 7600 kg/m 3 The diameter is 0.2 mm, the length is 12 mm, the cross section is rectangular, the appearance is wavy, and the breaking strength is 2650 MPa; the water reducer is a powdery polycarboxylic acid high-performance water reducer, the water content is 2%, and the water reducing rate is 30%; the water meets the requirements of the concrete water Standard (JGJ 63-2006).
The preparation method of the light shrinkage-reducing anti-crack ultra-high performance concrete comprises the following steps:
(1) Weighing the raw materials according to the proportion;
(2) Pouring sand and water accounting for 25% of the raw materials into a stirring pot, and stirring for 2 minutes;
(3) Pouring ordinary Portland cement, fly ash microbeads, silica fume and diatomite into a stirring pot, and stirring for 4 minutes; then pouring the vitrified microbeads into the mixture, and stirring for 2 minutes;
(4) Pouring the water reducer and the rest of water into a stirring pot, stirring for 2-5 minutes, and taking a slurry shape;
(5) And finally pouring the steel fibers into a stirring pot, stirring for 3 minutes, die-filling and forming, and removing the die after 48 hours for steam curing to obtain the light shrinkage-reducing anti-cracking ultra-high performance concrete.
Control 1 (without diatomaceous earth and vitrified microbeads)
The high-performance concrete consists of 100 parts by weight of ordinary Portland cement, 20 parts by weight of fly ash microbeads, 10 parts by weight of silica fume, 150 parts by weight of sand, 80 parts by weight of steel fibers, 3.5 parts by weight of water reducer and 20 parts by weight of water.
Wherein, the ordinary Portland cement is 42.5-grade ordinary Portland cement; the apparent density of the fly ash microbeads used is 800 kg/m 3 The average particle diameter was 2. Mu.m; siO of the silica fume used 2 95% by weight and a specific surface area of 1500 m 2 Kg, average particle size 0.1. Mu.m; the mesh number of the sand is 10-20 mesh; the density of the steel fibers used was 7600 kg/m 3 A diameter of 0.2 mm, a length of 12 mm, a rectangular cross section, and an outer sideThe shape is straight, and the breaking strength is 2700 MPa; the water reducer is a powdery polycarboxylic acid high-performance water reducer, the water content is 2%, and the water reducing rate is 30%; the water meets the requirements of the concrete water Standard (JGJ 63-2006).
The high performance concrete of this comparative example was prepared as follows:
(1) Weighing the raw materials according to the proportion;
(2) Pouring sand and water accounting for 25% of the raw materials into a stirring pot, and stirring for 2 minutes;
(3) Pouring ordinary Portland cement, fly ash microbeads and silica fume into a stirring pot, and stirring for 4 minutes;
(4) Pouring the water reducer and the rest of water into a stirring pot, stirring for 2-5 minutes, and taking a slurry shape;
(5) And finally pouring the steel fibers into a stirring pot, stirring for 3 minutes, molding in a mold, and removing the mold after 48 hours for standard maintenance to obtain the high-performance concrete.
Control 2 (without diatomaceous earth)
The high-performance concrete consists of 100 parts by weight of ordinary Portland cement, 20 parts by weight of fly ash microbeads, 10 parts by weight of vitrified microbeads, 10 parts by weight of silica fume, 110 parts by weight of sand, 80 parts by weight of steel fibers, 3.5 parts by weight of water reducer and 20 parts by weight of water.
Wherein, the ordinary Portland cement is 42.5-grade ordinary Portland cement; the apparent density of the fly ash microbeads used is 800 kg/m 3 The average particle diameter was 2. Mu.m; the bulk density of the vitrified microbeads used was 310 kg/m 3 The glass has a closed porosity of 85%, a water absorption of 55%, a cylinder pressure of 240 Kpa and an average particle diameter of 0.16 and mm; siO of the silica fume used 2 95% by weight and a specific surface area of 1500 m 2 Kg, average particle size 0.1. Mu.m; the mesh number of the sand is 10-20 mesh; the density of the steel fibers used was 7600 kg/m 3 The diameter is 0.2 mm, the length is 12 mm, the cross section is rectangular, the appearance is straight, and the breaking strength is 2700 MPa; the water reducer is a powdery polycarboxylic acid high-performance water reducer, the water content is 2%, and the water reducing rate is 30%; the water meets the concrete water standardRequirements of (JGJ 63-2006).
The high performance concrete of this comparative example was prepared as follows:
(1) Weighing the raw materials according to the proportion;
(2) Pouring sand and water accounting for 25% of the raw materials into a stirring pot, and stirring for 2 minutes;
(3) Pouring ordinary Portland cement, fly ash microbeads and silica fume into a stirring pot, and stirring for 4 minutes; then pouring the vitrified microbeads into the mixture, and stirring for 2 minutes;
(4) Pouring the water reducer and the rest of water into a stirring pot, stirring for 2-5 minutes, and taking a slurry shape;
(5) And finally pouring the steel fibers into a stirring pot, stirring for 3 minutes, molding in a mold, and removing the mold after 48 hours for standard maintenance to obtain the high-performance concrete.
Control example 3 (without vitrified microbead)
The high-performance concrete consists of 100 parts by weight of ordinary Portland cement, 20 parts by weight of fly ash microbeads, 10 parts by weight of silica fume, 20 parts by weight of diatomite, 150 parts by weight of sand, 80 parts by weight of steel fibers, 3.5 parts by weight of a water reducer and 20 parts by weight of water.
Wherein, the ordinary Portland cement is 42.5-grade ordinary Portland cement; the apparent density of the fly ash microbeads used is 800 kg/m 3 The average particle diameter was 2. Mu.m; siO of the silica fume used 2 95% by weight and a specific surface area of 1500 m 2 Kg, average particle size 0.1. Mu.m; the diatomite is calcined diatomite with 300 meshes and SiO 2 The content is 90 percent, and the impurity content is 8.5 percent; the mesh number of the sand is 10-20 mesh; the density of the steel fibers used was 7600 kg/m 3 The diameter is 0.2 mm, the length is 12 mm, the cross section is rectangular, the appearance is straight, and the breaking strength is 2700 MPa; the water reducer is a powdery polycarboxylic acid high-performance water reducer, the water content is 2%, and the water reducing rate is 30%; the water meets the requirements of the concrete water Standard (JGJ 63-2006).
The high performance concrete of this comparative example was prepared as follows:
(1) Weighing the raw materials according to the proportion;
(2) Pouring sand and water accounting for 25% of the raw materials into a stirring pot, and stirring for 2 minutes;
(3) Pouring ordinary Portland cement, fly ash microbeads, silica fume and diatomite into a stirring pot, and stirring for 4 minutes;
(4) Pouring the water reducer and the rest of water into a stirring pot, stirring for 2-5 minutes, and taking a slurry shape;
(5) And finally pouring the steel fibers into a stirring pot, stirring for 3 minutes, molding in a mold, and removing the mold after 48 hours for standard maintenance to obtain the high-performance concrete.
Comparative example 4 (Fine diatomaceous earth)
The high-performance concrete consists of 100 parts by weight of ordinary Portland cement, 20 parts by weight of fly ash microbeads, 10 parts by weight of vitrified microbeads, 10 parts by weight of silica fume, 20 parts by weight of diatomite, 110 parts by weight of sand, 80 parts by weight of steel fibers, 3.5 parts by weight of a water reducer and 20 parts by weight of water.
Wherein, the ordinary Portland cement is 42.5-grade ordinary Portland cement; the apparent density of the fly ash microbeads used is 800 kg/m 3 The average particle diameter was 2. Mu.m; the bulk density of the vitrified microbeads used was 310 kg/m 3 The glass has a closed porosity of 85%, a water absorption of 55%, a cylinder pressure of 240 Kpa and an average particle diameter of 0.16 and mm; siO of the silica fume used 2 95% by weight and a specific surface area of 1500 m 2 Kg, average particle size 0.1. Mu.m; the diatomite is calcined diatomite with the mesh number of 500 meshes and SiO 2 The content is 90 percent, and the impurity content is 8.5 percent; the mesh number of the sand is 10-20 mesh; the density of the steel fibers used was 7600 kg/m 3 The diameter is 0.2 mm, the length is 12 mm, the cross section is rectangular, the appearance is straight, and the breaking strength is 2700 MPa; the water reducer is a powdery polycarboxylic acid high-performance water reducer, the water content is 2%, and the water reducing rate is 30%; the water meets the requirements of the concrete water Standard (JGJ 63-2006).
The high performance concrete of this comparative example was prepared as follows:
(1) Weighing the raw materials according to the proportion;
(2) Pouring sand and water accounting for 25% of the raw materials into a stirring pot, and stirring for 2 minutes;
(3) Pouring ordinary Portland cement, fly ash microbeads, silica fume and diatomite into a stirring pot, and stirring for 4 minutes;
(4) Pouring the water reducer and the rest of water into a stirring pot, stirring for 2-5 minutes, and taking a slurry shape;
(5) And finally pouring the steel fibers into a stirring pot, stirring for 3 minutes, molding in a mold, and removing the mold after 48 hours for standard maintenance to obtain the high-performance concrete.
The results of the performance test of the concrete samples obtained in the examples and the comparative examples are shown in Table 1.
Table 1 results of Performance test of concrete samples obtained in examples and comparative examples
As can be seen from table 1, the mechanical properties of the examples and the comparative examples are not significantly different; meanwhile, in the embodiment, as the substitution amount of the vitrified microbeads to sand is increased, the apparent density of UHPC is continuously reduced; and compared with the comparative examples, the self-shrinkage and total cracking area of the concrete sample obtained in the examples are smaller than those of any one group of comparative examples, which shows that the shrinkage-reducing and cracking-resisting effects of the diatomite and the vitrified micro bubbles are better than those of the diatomite or the vitrified micro bubbles which are singly doped or undoped. Furthermore, as can be seen from a comparison of example 2 with comparative example 4, the mesh number of diatomaceous earth is a key parameter affecting self shrinkage and total cracking area.
The foregoing description is only of the preferred embodiments of the invention, and all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (1)
1. A light shrinkage-reducing anti-crack ultra-high performance concrete is characterized in that: the high-strength concrete consists of 100 parts by weight of ordinary Portland cement, 20 parts by weight of fly ash microbeads, 10 parts by weight of vitrified microbeads, 10 parts by weight of silica fume, 20 parts by weight of diatomite, 110 parts by weight of sand, 80 parts by weight of steel fibers, 3.5 parts by weight of a water reducer and 20 parts by weight of water;
wherein, the ordinary Portland cement is 42.5-grade ordinary Portland cement; the apparent density of the fly ash microbeads used is 800 kg/m 3 The average particle diameter was 2. Mu.m; the bulk density of the vitrified microbeads used was 310 kg/m 3 The glass has a closed porosity of 85%, a water absorption of 55%, a cylinder pressure of 240 Kpa and an average particle diameter of 0.16 and mm; siO of the silica fume used 2 95% by weight and a specific surface area of 1500 m 2 Kg, average particle size 0.1. Mu.m; the diatomite is calcined diatomite with 300 meshes and SiO 2 The content is 90 percent, and the impurity content is 8.5 percent; the mesh number of the sand is 10-20 mesh; the density of the steel fibers used was 7600 kg/m 3 The diameter is 0.2 mm, the length is 12 mm, the cross section is rectangular, the appearance is straight, and the breaking strength is 2700 MPa; the water reducer is a powdery polycarboxylic acid high-performance water reducer, the water content is 2%, and the water reducing rate is 30%; the water meets the requirements of the concrete water standard (JGJ 63-2006);
the preparation method of the light shrinkage-reducing anti-cracking ultra-high performance concrete comprises the following steps:
(1) Weighing the raw materials according to the proportion;
(2) Pouring sand and water accounting for 25% of the raw materials into a stirring pot, and stirring for 2 minutes;
(3) Pouring ordinary Portland cement, fly ash microbeads, silica fume and diatomite into a stirring pot, and stirring for 4 minutes; then pouring the vitrified microbeads into the mixture, and stirring for 2 minutes;
(4) Pouring the water reducer and the rest of water into a stirring pot, stirring for 2-5 minutes, and taking a slurry shape;
(5) And finally pouring the steel fibers into a stirring pot, stirring for 3 minutes, molding in a mold, and removing the mold after 48 hours for standard maintenance to obtain the light shrinkage-reducing anti-cracking ultra-high performance concrete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210946450.4A CN115368074B (en) | 2022-08-09 | 2022-08-09 | Light shrinkage-reducing anti-cracking ultra-high performance concrete and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210946450.4A CN115368074B (en) | 2022-08-09 | 2022-08-09 | Light shrinkage-reducing anti-cracking ultra-high performance concrete and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115368074A CN115368074A (en) | 2022-11-22 |
| CN115368074B true CN115368074B (en) | 2023-05-26 |
Family
ID=84063896
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210946450.4A Active CN115368074B (en) | 2022-08-09 | 2022-08-09 | Light shrinkage-reducing anti-cracking ultra-high performance concrete and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115368074B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115849749B (en) * | 2022-12-19 | 2024-04-05 | 福州大学 | High-strength environment-friendly alkali-activated cementing material and preparation method thereof |
| CN116354648A (en) * | 2023-01-31 | 2023-06-30 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Method for preparing low-shrinkage high-strength concrete by adopting internal curing microcapsules |
| CN116283128A (en) * | 2023-02-09 | 2023-06-23 | 中交第一公路勘察设计研究院有限公司 | Shrinkage-inhibiting anti-cracking ultra-high performance concrete and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110054457A (en) * | 2019-04-29 | 2019-07-26 | 安徽建筑大学 | Non-evaporating feeding lightweight ultra-high performance concrete of one kind and preparation method thereof |
| WO2021134236A1 (en) * | 2019-12-30 | 2021-07-08 | 青岛理工大学 | Lightweight aggregate ultra-high performance concrete and preparation method therefor |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5144849B2 (en) * | 2007-02-21 | 2013-02-13 | 電気化学工業株式会社 | Cement composition, hardened cement concrete, and method for producing hardened cement concrete |
| CN107265983A (en) * | 2017-08-08 | 2017-10-20 | 天津城建大学 | A kind of 180MPa ultra-high performance concretes and preparation method thereof |
| CN107721287B (en) * | 2017-11-13 | 2019-11-05 | 四川大学 | A kind of diatomite modified concrete and preparation method thereof |
| CN114538843B (en) * | 2022-01-17 | 2023-01-13 | 中国电建集团西北勘测设计研究院有限公司 | Low-energy-consumption ecological type ultra-high-performance concrete and preparation method thereof |
-
2022
- 2022-08-09 CN CN202210946450.4A patent/CN115368074B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110054457A (en) * | 2019-04-29 | 2019-07-26 | 安徽建筑大学 | Non-evaporating feeding lightweight ultra-high performance concrete of one kind and preparation method thereof |
| WO2021134236A1 (en) * | 2019-12-30 | 2021-07-08 | 青岛理工大学 | Lightweight aggregate ultra-high performance concrete and preparation method therefor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115368074A (en) | 2022-11-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN115368074B (en) | Light shrinkage-reducing anti-cracking ultra-high performance concrete and preparation method thereof | |
| Zhang et al. | A review on properties of fresh and hardened geopolymer mortar | |
| CN112266210B (en) | Light high-strength concrete and preparation method and application thereof | |
| CN113321467B (en) | Internal curing low-shrinkage lightweight aggregate ultrahigh-performance concrete and preparation method thereof | |
| CN112723764A (en) | Red mud-based cementing material, red mud-based lightweight aggregate concrete and preparation method thereof | |
| CN109293317A (en) | A kind of high intensity self-compacting concrete and preparation method thereof | |
| CN113955996B (en) | Phase-change anti-crack concrete and preparation method thereof | |
| CN111620624B (en) | Self-compacting concrete and preparation method thereof | |
| CN111099866B (en) | Thermal insulation building block prepared from plant fiber modified waste soil and preparation method thereof | |
| CN113816696A (en) | Recycled fine aggregate internal curing-based ultrahigh-performance concrete and preparation method thereof | |
| CN115724640B (en) | Gypsum slag cement concrete and preparation method thereof | |
| Lawal et al. | Effect of unburnt rice husk on the properties of concrete | |
| CN111704407A (en) | Concrete doped with waste glass | |
| CN114014613B (en) | Salt corrosion resistant concrete and preparation method thereof | |
| CN115340329A (en) | Recycled fine aggregate-magnesium oxide base expanding agent ultrahigh-performance concrete and preparation method thereof | |
| KR101086980B1 (en) | High-Strength Light weight Concrete | |
| EP1888480B1 (en) | High performance concrete with a quick resistance development lacking added materials with latent hydraulic activity | |
| CN115368103B (en) | Shrinkage-reducing anti-cracking alkali-activated slag mortar and preparation method thereof | |
| CN114751768B (en) | Light-weight high-strength recycled aggregate geopolymer mortar for 3D printing and preparation method thereof | |
| CN115490448B (en) | Method for reducing self-shrinkage of ultra-high-performance concrete, high-strength concrete and high-strength mortar | |
| CN115073074A (en) | Environment-friendly solid waste recycled concrete and preparation method thereof | |
| CN115353412A (en) | Calcium magnesium silicate light heat-preservation and heat-insulation wall material and preparation method thereof | |
| CN114956707A (en) | Concrete for frame structure house and preparation method thereof | |
| CN111825356A (en) | High-activity regeneration auxiliary cementing material based on physical ball milling and chemical modification synergistic reinforcement of brick-concrete powder and preparation method thereof | |
| Oliveira et al. | Blasted copper slag as artificial fines in ecofriendly concrete |
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 |