CN113321433B - Special cementing material for preparing wear-resistant ultrahigh-performance concrete - Google Patents
Special cementing material for preparing wear-resistant ultrahigh-performance concrete Download PDFInfo
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- CN113321433B CN113321433B CN202110805872.5A CN202110805872A CN113321433B CN 113321433 B CN113321433 B CN 113321433B CN 202110805872 A CN202110805872 A CN 202110805872A CN 113321433 B CN113321433 B CN 113321433B
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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
- C04B7/00—Hydraulic cements
- C04B7/32—Aluminous cements
- C04B7/323—Calcium aluminosulfate cements, e.g. cements hydrating into ettringite
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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
- C04B7/00—Hydraulic cements
- C04B7/02—Portland cement
- C04B7/04—Portland cement using raw materials containing gypsum, i.e. processes of the Mueller-Kuehne type
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- 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
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Abstract
The invention discloses a special cementing material for preparing wear-resistant ultra-high performance concrete, which is prepared from the following raw materials in parts by weightUniformly mixing to obtain: 65-75 parts of portland cement clinker powder; 20-30 parts of high-iron high-belite sulphoaluminate cement clinker powder; 5-10 parts of gypsum powder. The high-iron high-belite sulphoaluminate cement clinker has the following material parameters: the alkalinity coefficient Cm is 1.2-1.4, fCaO is 3-5%, fSO 3 2-3%; the mineral composition is as follows: c 2 The content of S mineral is 45-50%,
mineral content of 20-26%, C 4 20-25% of AF mineral, CaSO 4 The mineral content is 3-5%, and the fCaO mineral content is 2-4%. The wear resistance of the special cementing material is obviously improved by 40 percent compared with the Portland cement, and reliable technical support is provided for improving the wear resistance of the wear-resistant UHPC material.
Description
Technical Field
The invention belongs to the technical field of concrete, and particularly relates to a special cementing material for preparing wear-resistant ultrahigh-performance concrete.
Background
The problem of abrasion resistance has been a problem that plagues the cement industry, with downtime due to wear accounting for 50% to 55% of the total downtime. In the cement industry, the interior of a plurality of devices and pipelines is prematurely damaged by the scouring of materials or high-concentration dust-containing gas for a long time, and the service life is greatly reduced. How to improve the service life of the equipment and the pipeline, improve the operation efficiency of the equipment and keep the stable operation of a production system has great significance for reducing the production cost and saving energy.
The effective protection of equipment and pipelines by using wear-resistant materials is a reliable technical approach for solving the problem of abrasion resistance, so that the pursuit of high-performance and high-cost-performance wear-resistant materials in the market never stops, and the application of continuous technical innovation materials is not slow. At present, the most wear-resistant material used in the field is a wear-resistant ceramic coating which is a non-metallic cementing material and has better wear resistance and use effect, but the problems of low strength, poor workability and the like generally exist.
The ultra-high performance concrete (UHPC for short) is the most innovative new cement-based material, has ultra-high strength (150 plus 200MPa), high corrosion resistance, durability, high toughness and scouring resistance, can be prepared into the wear-resistant ultra-high performance concrete by further enhancing the wear resistance, further improves the strength and hardness of the material, reduces the dependence degree of the wear resistance of the material on ceramic aggregate, greatly reduces the preparation cost of the wear-resistant material, and improves the cost performance.
The existing wear-resistant materials mainly comprise wear-resistant ceramic paint products, and Chinese patent publication No. CN101054484A discloses a wear-resistant ceramic paint and a preparation method thereof, wherein portland cement or high-alumina cement is taken as a cementing material, corundum, high-alumina bauxite clinker and silicon carbide are taken as aggregates, silicon micropowder or aluminum micropowder is taken as a filler, and a high-efficiency water reducing agent and steel fibers are added to prepare the wear-resistant ceramic paint. Chinese patent publication No. CN109095860A, aiming at the problem that the wear resistance of the traditional wear-resistant ceramic coating can not be further improved, discloses a new wear-resistant ceramic coating, which is prepared by taking high-alumina cement as an adhesive and corundum or silicon carbide as an aggregate and adding an energy-saving material, a high-efficiency water reducing agent and steel fibers, and has good workability and high breaking strength.
The technical means for preparing the wear-resistant material mainly depends on the high wear resistance of ceramic aggregates such as corundum, silicon carbide, high-alumina bauxite clinker and the like, but the ceramic aggregates are expensive, so that the preparation cost is higher. The used cementing material is also mainly silicate cement or high-alumina cement which is already available in the market, and only has a cementing effect, so that the wear resistance of hardened slurry of the cementing material is insufficient. The common cementing material and material system design leads the strength of the material to be not high, and even under the condition of reducing the water-gel ratio of the material system by adopting the high-efficiency water reducing agent, the 28d strength of the material is lower and can only reach 100-130 MPa.
Disclosure of Invention
In order to solve the problems of the prior wear-resistant material in the aspects of technology and economy, the invention provides the special cementing material for preparing the wear-resistant ultra-high performance concrete, wherein the high-iron high-belite sulphoaluminate cement clinker contains a large amount of iron-phase minerals, and the wear resistance of a hydration product is 1.5 times that of a hydration product of the silicate cement clinker, so that the wear resistance of the special cementing material is obviously improved by 40 percent compared with the wear resistance of the silicate cement, and a reliable technical support is provided for improving the wear resistance of the wear-resistant UHPC material.
The invention is realized in such a way that the special cementing material for preparing the wear-resistant ultra-high performance concrete is obtained by dry mixing the following raw materials in parts by weight: 65-75 parts of portland cement clinker powder; 20-30 parts of high-iron high-belite sulphoaluminate cement clinker powder; 5-10 parts of gypsum powder.
In the above technical scheme, preferably, the high-iron high-belite sulphoaluminate cement clinker powder is obtained by grinding high-iron high-belite sulphoaluminate cement clinker until the specific surface area is 400-450 m 2 Obtained in kg.
In the above technical solution, it is further preferable that the blending parameters of the high-iron high-belite sulphoaluminate cement clinker are as follows: the alkalinity coefficient Cm is 1.2-1.4, fCaO is 3-5%, fSO 3 2-3%; the high-iron high-belite sulphoaluminate cement clinker has the following mineral composition in percentage by weight: c 2 The content of S mineral is 45-50%,
mineral content of 20-26%, C 4 The content of AF mineral is 20-25%, CaSO 4 The mineral content is 3-5%, and the fCaO mineral content is 2-4%.
In the above technical scheme, preferably, the portland cement clinker powder is ground from ordinary portland cement clinker to a specific surface area of 350-380 m 2 Obtained as a/kg.
In the above technical scheme, preferably, the gypsum powder is prepared by grinding natural dihydrate gypsum, anhydrite or desulfurized gypsum until the specific surface area is 380-400 m 2 /kg of SO in said landplaster 3 The content is more than 40 percent.
The special cementing material is compounded by portland cement clinker, high-iron high-belite sulphoaluminate cement clinker and gypsum, wherein the high-iron high-belite sulphoaluminate cement clinker contains a large amount of iron phase minerals, the wear resistance of a hydration product of the high-iron high-belite sulphoaluminate cement clinker is 1.5 times that of the hydration product of the portland cement clinker, so that the wear resistance of the special cementing material hardening slurry is improved by about 40 percent relative to the silicate cement hardening slurry, and the wear resistance of a UHPC material can be improved from the aspect of hardening of the cementing material when the wear-resistant UHPC is prepared; meanwhile, the addition of the clinker of the high-iron high-belite sulphoaluminate cement obviously improves the bonding performance of the cementing material and promotes the firm bonding of the wear-resistant UHPC material and equipment or pipelines; the high-iron high-belite sulphoaluminate cement clinker contains a small amount of free calcium oxide, and the special cementing material is endowed with proper micro-expansibility, so that the cracking of the wear-resistant ultra-high performance concrete in the construction and use processes can be reduced, and the use durability can be improved.
The invention has the advantages and positive effects that:
1) compared with the common Portland cement, the special cementing material for preparing the wear-resistant UHPC provided by the invention has the advantage that the wear resistance of hardened slurry is improved by about 40%, so that the wear resistance of the wear-resistant material can be improved from the aspect of the cementing material.
2) The clinker of the high-iron high-belite sulphoaluminate cement provided by the invention contains a large amount of iron phase minerals, the wear resistance of a hydration product of the clinker is 1.5 times that of a hydration product of the silicate cement clinker, and the clinker is a main reason for obviously improving the wear resistance of a special cementing material, and the small amount of free calcium oxide ensures that the cementing material has a micro-expansion effect, can reduce the contraction of a wear-resistant UHPC material system, and reduces the cracking tendency.
3) The wear-resistant UHPC prepared by the special cementing material has the advantages of fast strength generation, high compressive strength and rupture strength and strong impact resistance. The 1d compressive strength can reach 70MPa, the flexural strength can reach 15Pa, the 28d compressive strength can reach more than 180MPa, and the flexural strength can reach more than 35 MPa. The 1d compressive strength of the wear-resistant ceramic coating is only 30-40MPa, and the 28d compressive strength is only 100-130 MPa.
4) The wear-resistant UHPC prepared by the special cementing material has excellent wear resistance, can reach or exceed the optimal grade of the wear-resistant ceramic coating, and the wear resistance of the wear-resistant ceramic coating product is generally 4.0-8.0cm of wear value due to the difference of the types of the wear-resistant aggregate products used 3 The abrasion value of the wear-resistant UHPC prepared by the special cementing material is less than 4.0cm (determined according to GB/T18301-2012 standard) 3 Even if the strength of the common UHPC material is as high as 180MPa, the abrasion value of the common UHPC material is still as high as 8.0cm 3 Above all, the wear resistance is inferior to that of the wear-resistant ceramic coating.
5) The wear-resistant UHPC prepared by the special cementing material has high bonding strength, firm bonding with equipment or pipelines, small shrinkage and good volume stability, can not carry out secondary repair due to shrinkage cracks, reduces the dependence of the wear-resistant material on the construction of the tortoise shell net, and even does not use the tortoise shell net during the construction.
6) When the special cementing material is used for preparing the wear-resistant UHPC, corundum, silicon carbide and calcined bauxite clinker which are expensive and scarce wear-resistant aggregates are not used, industrial solid waste aggregates with wide sources are used, the preparation cost of the wear-resistant material is reduced by about 80 percent, and the special cementing material is beneficial to popularization and large-scale production and application of a new technology.
7) The wear-resistant UHPC prepared by the special cementing material has better workability, cohesiveness and other working properties, and can be conveniently constructed or improve the construction quality.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1 preparation of high iron high belite sulphoaluminate Cement clinker powder
Grinding according to the raw material weight proportion and the material proportion value shown in the table 1 to obtain 1.0 ton of raw material with the fineness of 0.08mm and the screen residue of less than 8 percent, calcining the raw material in a rotary kiln at 1310 ℃ to obtain 0.74 ton (the loss of the raw material on ignition is 26 percent) of high-iron high belite sulphoaluminate cement clinker, and grinding to obtain the clinker with the specific surface area of 400-450 m 2 Perkg of high-iron high-belite sulphoaluminate cement clinker powder.
TABLE 1 raw mix ratio and batch rate values
The mineral composition of the clinker of the high-iron high-belite sulphoaluminate cement is shown in table 2.
TABLE 2 mineral composition of high-iron high-belite sulphoaluminate cement clinker
The physical properties of the high-iron high-belite sulphoaluminate cement clinker measured according to standards GB17671-1999 method for testing cement mortar strength (ISO method), GB/T1346-2011 method for testing water consumption, setting time and stability of standard consistency of cement and JC/T421-2004 method for testing wear resistance of cement mortar are shown in Table 3.
TABLE 3 physical Properties of high-iron high-belite sulphoaluminate cement clinker
As can be seen from Table 3, the high-iron high-belite sulphoaluminate cement clinker has very excellent wear resistance of cement mortar under the conditions of higher physical strength and lower water demand, and the wear loss is only 0.12kg/m 2 On the left and right, corresponding to 1/5 of ordinary portland cement. Therefore, the high-iron high-belite sulphoaluminate cement clinker is mixed into the silicate cement clinker to form the special cementing material, so that the mortar abrasion loss of the cementing material can be obviously reduced, and the abrasion resistance is improved.
EXAMPLE 2 preparation of a specialty Cement
The components are sequentially added into a dry powder mixer according to the weight ratio shown in Table 4, and are fully and uniformly mixed to obtain the wear-resistant UHPC special cementing material.
TABLE 4 weight ratio of special cementing material
The physical properties of the special cementing materials are measured according to standard GB17671-1999 method for testing strength of cement mortar (ISO method) and GB/T1346-2011 method for testing water consumption, setting time and stability of standard consistency of cement, and the abrasion resistance of the mortar is measured according to JC/T421-2004 method for testing abrasion resistance of cement mortar, with the results shown in Table 5.
TABLE 5 physical Properties of the specialty cements
As can be seen from Table 5, the special cementing material composed of the portland cement clinker, the high-iron and high-belite sulphoaluminate cement clinker and a proper amount of gypsum has a flexural strength which is obviously higher than that of the portland cement, and the wear resistance is obviously improved by 40% compared with the portland cement (the wear value of the 28d mortar is reduced by about 40%), so that a reliable technical support is provided for improving the wear resistance of the wear-resistant UHPC material from the aspect of the cementing material.
EXAMPLE 3 preparation of a wear resistant UHPC Material
In this example, SiO in the silica fume 2 The content is more than 95 percent, and the specific surface area is not less than 20000m 2 In terms of/kg. The steel slag aggregate is solid waste slag-steel slag produced in metallurgical industry, and the particle size of the steel slag aggregate is more than or equal to 1.0mm and less than or equal to 3.0mm after crushing and screening; the iron tailing sand is obtained by drying and sorting the ore tailings-iron tailings generated in the iron ore dressing process, so that the particle size of the iron tailing sand is not less than 0.5mm and not more than 1.0 mm; the quartz sand is water-washed drying sand with the grain size less than or equal to 0.5 mm; the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, and the water reducing rate is more than 30 percent; the length of the copper-plated steel fiber is 10mm-15mm, and the diameter is 0.15mm-0.2 mm.
Group number 1:
weighing the following raw material components in parts by weight: 650g of special cementing material; 150g of silica fume; 620g of steel slag aggregate; 350g of iron tailing sand; 250g of quartz sand; 15g of water reducing agent; 80g of copper-plated steel fiber; 170g of water.
The preparation method comprises the following steps: pouring the special cementing material, silica fume, steel slag aggregate, iron tailing sand and quartz sand into a planetary mortar mixer, and stirring for 2 minutes to uniformly mix; mixing the water reducing agent into water, fully dissolving and uniformly mixing the water reducing agent and the water, and then pouring the mixture into the mixture to continue stirring for 3 minutes; and pouring the copper-plated steel fibers into the mixture, and continuously stirring for 2 minutes to obtain the wear-resistant UHPC mixture.
Group number 2:
weighing the following raw material components in parts by weight: weighing the following raw material components in parts by weight: 650g of special cementing material; 120g of silica fume; 600g of steel slag aggregate; 350g of iron tailing sand; 260g of quartz sand; 16g of water reducing agent; 90g of copper-plated steel fiber; 160g of water.
The preparation method comprises the following steps: pouring the special cementing material, silica fume, steel slag aggregate, iron tailing sand and quartz sand into a planetary mortar mixer, and stirring for 2 minutes to uniformly mix; mixing the water reducing agent into water, fully dissolving and uniformly mixing the water reducing agent and the water, and then pouring the mixture into the mixture to continue stirring for 3 minutes; and pouring the copper-plated steel fibers into the mixture, and continuously stirring for 2 minutes to obtain the wear-resistant UHPC mixture.
Group number 3:
weighing the following raw material components in parts by weight: weighing the following raw material components in parts by weight: 620g of special cementing material; 140g of silica fume; 620g of steel slag aggregate; 340g of iron tailing sand; 240g of quartz sand; 18g of water reducing agent; 100g of copper-plated steel fiber; 180g of water.
The preparation method comprises the following steps: pouring the special cementing material, silica fume, steel slag aggregate, iron tailing sand and quartz sand into a planetary mortar mixer, and stirring for 2 minutes to uniformly mix; mixing the water reducing agent into water, fully dissolving and uniformly mixing the water reducing agent and the water, and then pouring the mixture into the mixture to continue stirring for 3 minutes; and pouring the copper-plated steel fibers into the mixture, and continuously stirring for 2 minutes to obtain the wear-resistant UHPC mixture.
Group number 4:
weighing the following raw material components in parts by weight: weighing the following raw material components in parts by weight: 600g of special cementing material; 120g of silica fume; 650g of steel slag aggregate; 300g of iron tailing sand; 260g of quartz sand; 17g of water reducing agent; 90g of copper-plated steel fiber; 175g of water.
The preparation method comprises the following steps: pouring the special cementing material, silica fume, steel slag aggregate, iron tailing sand and quartz sand into a planetary mortar mixer, and stirring for 2 minutes to uniformly mix; mixing the water reducing agent into water, fully dissolving and uniformly mixing the water reducing agent and the water, and then pouring the mixture into the mixture to continue stirring for 3 minutes; and pouring the copper-plated steel fibers into the mixture, and continuously stirring for 2 minutes to obtain the wear-resistant UHPC mixture.
Comparative 1 (plain UHPC):
weighing the following raw material components in parts by weight: 800g of Portland cement; 140g of silica fume; 160g of I-grade fly ash; 156g of copper-plated steel fiber; 16.5g of water reducing agent; 990g of quartz sand; 185g of water.
The preparation method comprises the following steps: pouring portland cement, silica fume, I-grade fly ash and quartz sand into a planetary mortar stirrer, and stirring for 2 minutes to uniformly mix the materials; mixing the water reducing agent into water, fully dissolving and uniformly mixing the water reducing agent and the water, and then pouring the mixture into the mixture to continue stirring for 3 minutes; and pouring the copper-plated steel fibers into the mixture, and continuously stirring for 2 minutes to obtain a common UHPC mixture.
Comparative 2 (abrasion resistant ceramic coating):
weighing the following raw material components in parts by weight: 760g of Portland cement; 640g of calcined bauxite clinker aggregate; 300g of brown corundum aggregate; 300g of silicon carbide aggregate; 100g of copper-plated steel fiber; 10g of naphthalene water reducing agent; 220g of water.
The preparation method comprises the following steps: pouring the portland cement, calcined bauxite clinker aggregate, brown corundum aggregate and silicon carbide aggregate into a planetary mortar mixer, and stirring for 2 minutes to uniformly mix; mixing the naphthalene water reducer with water, fully dissolving and uniformly mixing the naphthalene water reducer and the water, and then pouring the mixture into the mixture to continue stirring for 3 minutes; and pouring the copper-plated steel fibers into the mixture, and continuously stirring for 2 minutes to obtain the wear-resistant ceramic coating mixture.
The abrasion resistance and strength of each set number of abrasion resistant UHPC and two comparative samples were measured and the results are shown in Table 6. The wear resistance is measured according to GB/T18301-2012 test method for normal temperature wear resistance of refractory materials, the compressive strength and the breaking strength are measured according to GB17671-1999 test method for cement mortar strength (ISO method), and the test block is a prism of 40mm × 40mm × 160 mm.
TABLE 6 physical Properties of wear-resistant UHPC for each group number
As can be seen from Table 6, the wear-resistant HUPC prepared by adopting the special cementing material of the invention through the matching of solid waste aggregates and the design idea of closest powder material accumulation has the advantages that compared with the existing wear-resistant material (comparison 2), under the condition that the wear-resistant performance reaches or is slightly superior, the strength is greatly improved, the 28d strength can be improved by about 50 percent, which has great help to the shock resistance of the wear-resistant material in the actual use process, and the preparation cost of the wear-resistant UHPC can be greatly reduced by more than 80 percent compared with the wear-resistant ceramic coating because expensive aggregates such as corundum, silicon carbide, calcined bauxite and the like are not used; compared with the prior common UHPC material (comparison 1), under the condition of basically same strength, the wear resistance of the material is greatly improved, and the abrasion loss can be reduced by about 55 percent.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: it is to be understood that modifications may be made to the technical solutions described in the foregoing embodiments, or some or all of the technical features may be equivalently replaced, and the modifications or the replacements may not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (3)
1. A special cementing material for preparing wear-resistant ultra-high performance concrete is characterized in that: the fertilizer is prepared by uniformly mixing the following raw materials in parts by weight: 65-75 parts of portland cement clinker powder; 20-30 parts of high-iron high-belite sulphoaluminate cement clinker powder; 5-10 parts of gypsum powder;
the high-iron high-belite sulphoaluminate cement clinker powder is high-iron high-belite sulphoaluminate cementGrinding the clinker until the specific surface area is 400-450 m 2 The/kg is obtained;
the high-iron high-belite sulphoaluminate cement clinker has the following material parameters: the alkalinity coefficient Cm is 1.2-1.4, fCaO is 3-5%, fSO 3 2-3%; the high-iron high-belite sulphoaluminate cement clinker has the following mineral composition in percentage by weight: c 2 The content of S mineral is 45-50%,
mineral content of 20-26%, C 4 The content of AF mineral is 20-25%, CaSO 4 The mineral content is 3-5%, and the fCaO mineral content is 2-4%.
2. The special cementing material for preparing wear-resistant ultra-high performance concrete according to claim 1, wherein: the Portland cement clinker powder is prepared by grinding common Portland cement clinker until the specific surface area is 350-380 m 2 Obtained as a/kg.
3. The special cementing material for preparing wear-resistant ultra-high performance concrete according to claim 1, wherein: the gypsum powder is prepared by grinding natural dihydrate gypsum, anhydrite or desulfurized gypsum until the specific surface area is 380-400 m 2 /kg of SO in the gypsum powder 3 The content is more than 40 percent.
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