CN115477514A - High-fracture-resistance biomass ash modified ultrafine powder dry and hard pavement concrete and preparation method thereof - Google Patents
High-fracture-resistance biomass ash modified ultrafine powder dry and hard pavement concrete and preparation method thereof Download PDFInfo
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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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
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention relates to the technical field of cement materials, and particularly discloses high-fracture-resistance biomass ash modified ultrafine powder dry and hard pavement concrete and a preparation method thereof. The preparation method of the concrete comprises the following steps: a1. carrying out secondary calcination on the biomass ash; a2. preparing a mixture of modified biomass ash and latex powder; a3. preparing a water reducing agent dilution solution; a4. mixing the materials and stirring uniformly. According to the invention, the biomass ash is modified by doping the superfine composite mineral admixture and the latex powder, so that on one hand, the problem of large water demand of the biomass ash concrete is solved by utilizing the micro-scale mixing effect of the superfine composite mineral admixture; on the other hand, the problems of loose concrete structure and poor durability caused by fibrous particles of the biomass ash after being mixed are solved by utilizing the volcanic ash effect of the superfine composite mineral admixture and the synergistic effect of the latex powder and the biomass ash.
Description
Technical Field
The invention relates to the field of cement materials, and particularly provides high-fracture-resistance biomass ash modified ultrafine powder dry and hard pavement concrete and a preparation method thereof.
Background
Biomass ash is widely concerned as a low-carbon renewable material. The raw materials of the biomass ash are crop straws, rice hulls, fallen leaves, tree roots, barks and the like generally, the biomass ash burned at low temperature contains phases and chemical compositions similar to fly ash, and the biomass ash has good micro-aggregate filling effect and volcanic ash effect; the biomass ash has potential gelling property as the mineral admixture, can be hardened by a certain means to form a concrete cementing material with certain performance, can replace fly ash and blast furnace slag, and has wide value potential.
At present, the application of the biomass ash in the field of materials has been advanced, and the biomass ash is mainly applied to the field of building materials and the field of road materials. The biomass ash can be mixed with certain mineral admixtures, such as lime, fly ash and the like to prepare cement-based materials, or can directly replace part of cement to prepare building blocks after grinding treatment; the biomass ash can modify the basic pavement material, so that the basic pavement material has better performance. However, the use of the biomass ash still has two problems, one is that due to the physical properties of rough and porous surfaces of particles of the biomass ash, the porosity of a system is increased after the biomass ash is added, the structural density of a cement-based material is reduced, and the durability of concrete is influenced; secondly, the addition of the biomass ash improves the water demand of the cement-based material, so that the workability of the concrete is reduced and the strength is reduced. Liu Yong et al utilize biomass ash to prepare cement mortar in Experimental research on the influence of biomass ash on compressive strength of cement hardened slurry, under the same mixing amount, the strength of the biomass ash-cement mortar is smaller than that of a reference group, and the hardened cement mortar is loose and porous; in the preliminary research on the performance of the composite cementing material of the steel slag and the rice hull ash which are mixed together, chua army and the like prepare cement mortar by using the steel slag and the ground rice hull ash, and find that the slurry has poor fluidity and the compressive strength is not obviously improved.
Frost resistance is one of the very important performance criteria of concrete materials. When the concrete is frozen in a low-temperature freezing area, the structure is damaged by freeze-thaw cycles of internal free water, so that the surface of the concrete is degraded and the mechanical property is reduced. For dry and hard pavement concrete, the frost resistance is particularly important, and the repair of the road not only consumes a large amount of manpower and color force, but also has influence on social production and life work.
Disclosure of Invention
Aiming at the defects of the prior art, the invention utilizes different mineral admixtures to carry out compounding and ultra-fining; the biomass ash is modified, and the ratio of the biomass ash to the superfine composite mineral admixture is adjusted, so that the high-flexural-resistance biomass ash modified superfine powder dry and hard pavement concrete with excellent working performance, mechanical property and frost resistance is provided.
The technical scheme adopted by the invention for solving the technical problems is as follows: a high-flexural-resistance biomass ash modified superfine powder dry and hard pavement concrete comprises the raw materials of cement, superfine composite mineral admixture, biomass ash, latex powder, aggregate, water reducing agent and water,
the preparation method comprises the following steps:
a1. carrying out secondary calcination on the biomass ash;
a2. mixing the calcined biomass ash and the latex powder with a proper amount of water, uniformly stirring, performing ultrasonic dispersion, and removing water in the dispersion liquid to obtain a modified biomass ash and latex powder mixture;
a3. mixing a water reducing agent with a proper amount of water to obtain a water reducing agent diluted solution;
a4. and mixing the cement, the superfine composite mineral admixture, the modified biomass ash and latex powder mixture, the aggregate, the water reducer diluted solution and the balance of water, and uniformly stirring to obtain the high-bending-resistance biomass ash modified superfine dry hard pavement concrete.
Preferably, the step a1 of subjecting the biomass ash to secondary calcination comprises:
a11. performing primary calcination treatment on the dried biomass ash at 200-400 ℃, wherein the calcination temperature is further preferably 250-350 ℃, and the calcination time is preferably 1-3h, and is further preferably 2-3h;
a12. after the first calcination treatment, quenching is carried out, and the second calcination treatment is carried out at 600-800 ℃, wherein the calcination temperature is more preferably 600-700 ℃, and the calcination time is preferably 4-6h, more preferably 5-6h.
Preferably, the biomass ash may be dried at 100 to 150 ℃ before the first calcination treatment, and the drying temperature is more preferably 100 to 120 ℃.
Preferably, the biomass ash after the second calcination treatment can be ground for 20 to 40min, more preferably 20 to 30min.
Preferably, the mass ratio of the calcined biomass ash to the latex powder is (40-100): 0.3-2.0, and more preferably (50-90): 0.5-1.5.
The latex powder can be VAE rubber powder, vac rubber powder and PVac rubber powder, and is preferably VAE rubber powder.
Preferably, the power of ultrasonic dispersion is 400W-600W, more preferably 450W-550W; ultrasonic dispersion treatment is carried out for 20-40min, and more preferably for 25-35min.
Preferably, the biomass ash and latex powder dispersion is subjected to suction filtration and drying to obtain a modified biomass ash and latex powder mixture. The drying temperature is preferably 85-95 ℃.
Preferably, the superfine composite mineral admixture is obtained by mixing two or more than two kinds of minerals, drying and superfine grinding, wherein the minerals are fly ash, slag, coal gangue, clay brick or low-alkali red mud.
Preferably, the blended mineral mixture is dried at 85-95 deg.C, more preferably at 85-90 deg.C.
Preferably, the specific surface area of the ground composite mineral admixture is 700-800kg/m 2 。
Preferably, the high-fracture-resistance biomass ash modified ultrafine powder dry and hard pavement concrete comprises the following raw materials in parts by weight:
the weight ratio of the raw materials is further preferably as follows:
preferably, the aggregate is composed of a coarse aggregate and a fine aggregate, and the mass ratio of the coarse aggregate to the fine aggregate is (1.5-2.5): 1, more preferably (1.9-2.1): 1. The coarse aggregate comprises two graded mechanical broken stones of 5-20mm and/or 20-40mm, and the fine aggregate is river sand with fineness modulus of 2.8-3.0.
The water reducing agent can be a polycarboxylic acid high-efficiency water reducing agent, a naphthalene high-efficiency water reducing agent and an HBS aliphatic high-efficiency water reducing agent, and is preferably a polycarboxylic acid water reducing agent.
The invention further aims to provide a preparation method of the high-fracture-resistance biomass ash modified ultrafine powder dry and hard pavement concrete, which comprises the following steps:
a1. carrying out secondary calcination on the biomass ash;
a2. mixing the calcined biomass ash and the latex powder with a proper amount of water, uniformly stirring, performing ultrasonic dispersion, and removing water in the dispersion liquid to obtain a modified biomass ash and latex powder mixture;
a3. mixing a water reducing agent with a proper amount of water to obtain a water reducing agent diluted solution;
a4. and mixing the cement, the superfine composite mineral admixture, the modified biomass ash and latex powder mixture, the aggregate, the water reducer diluted solution and the balance of water, and uniformly stirring to obtain the high-bending-resistance biomass ash modified superfine dry and hard pavement concrete.
The high-bending-resistance biomass ash modified ultrafine powder dry and hard pavement concrete is prepared into a gelation system of the dry and hard pavement concrete by using ultrafine two or more composite mineral admixtures, modified biomass ash and common portland cement, the biomass ash is modified by using secondary calcination, grinding treatment and latex powder, and meanwhile, the working performance of the concrete is improved by using a polycarboxylic acid water reducing agent, and compared with the prior art, the high-bending-resistance biomass ash modified ultrafine powder dry and hard pavement concrete has the following outstanding beneficial effects:
(1) The complex mineral admixture is utilized, and different mineral admixtures are subjected to advantage complementation and synergistic enhancement;
(2) The composite mineral admixture is superfined, the specific surface area of the mineral admixture is 700-800kg/m 2 So that the micro-aggregate effect and the volcanic ash effect can be better exerted;
(3) The activity of the biomass ash is maximized by utilizing a secondary calcination system and a grinding procedure;
(4) The biomass ash is modified by utilizing the latex powder, on one hand, the main component of the biomass ash is silicate and contains more SiO 2 The latex powder shows alkalinity, and can release carboxyl and Ca (OH) under the high-alkali environment 2 Reacting to form a cross-linked net structure product, and connecting other hydration products into a whole; on the other hand, the unreacted latex powder can be distributed in different areas in the concrete to form a biomembrane structure, so that loose pores formed by the biomass ash fibrous particles in the concrete can be effectively blocked. And the superior micro-aggregate effect and volcanic ash effect of the superfine composite mineral admixture can effectively solve the problems of large water demand and loose structure of the biomass ash dry and hard pavement concrete and improve the durability of the dry and hard pavement concrete.
Drawings
FIG. 1 shows the mechanical strength of concrete of different ages in different mixing ratios of the superfine composite mineral admixture and the biomass ash;
FIG. 2 shows the number of freeze-thaw cycles experienced by concrete in different mix ratios of the ultra-fine composite mineral admixture and the biomass ash;
FIG. 3 shows the porosity of concrete with different mixing ratios of the superfine composite mineral admixture and the biomass ash.
Detailed Description
The present invention is further described in the following examples, which are intended to be illustrative only and not to be limiting as to the scope of the invention, wherein the preferred methods and materials are set forth in the following examples, which are intended to be illustrative only and are to be construed in detail.
In the following examples, it is preferred that,
fly ash, class II fly ash, available from Zhejiang Uygur New building materials Co., ltd;
slag, S95 grade granulated blast furnace slag, purchased from Shandong mountain and river group, inc.;
the cement is low-heat cement (ordinary portland cement) and is from the Ministry of Shandong for Huajia materia science and technology Co., ltd;
the biomass ash is corn straw ash and comes from a Zibo Zizizi region in Shandong province;
fine aggregate, river sand with fineness modulus of 2.8-3.0, water content of 3%, from Min's science and technology company of Huajia material in Shandong.
Coarse aggregate, two graded mechanical broken stones with the grain diameter of 5-20mm and 20-40mm, the mixture ratio of the two is 0.56:1 from Prime, china for materials science and technology, inc.
Water reducers, polycarboxylic acid water reducers, from Zibo doublets;
latex powder, VAE rubber powder, was purchased from Shandong Hao Jian national trade Co., ltd.
[ EXAMPLES one ]
Preparing the superfine composite mineral admixture:
mixing the fly ash and the slag in a mass ratio of 4. The specific surface area of the superfine composite mineral admixture is 763kg/m 2 Median diameterIs 4.24 μm, and the specific components and mass percentages are shown in Table 1.
TABLE 1
Of these, other is the most common oxide in the cement concrete industry, such as Cr 2 O 3 And CuO.
[ example two ]
The method for treating the corn straw ash comprises the following steps:
(1) Drying the biomass ash at 110 ℃ for 4h;
(2) Carrying out primary calcination treatment on the dried biomass ash at 300 ℃, wherein the treatment time is 3h;
(3) Quenching after the first calcining treatment, and performing second calcining treatment at 600 ℃ for 6h;
(4) And grinding the biomass ash powder subjected to secondary calcination for 20min to obtain the treated corn straw ash.
[ EXAMPLE III ]
The dry and hard pavement concrete of the embodiment is prepared from the following materials:
330Kg of ordinary portland cement, 150Kg of corn straw ash (prepared by the method described in example two), 1390.6Kg of coarse aggregate, 669.9Kg of fine aggregate, 6.6Kg of polycarboxylic acid water reducer, and 113Kg of water.
The preparation method comprises the following steps:
(1) Mixing a water reducing agent with 1/4 of the required water amount to obtain a water reducing agent diluted solution;
(2) Pouring cement, calcined corn straw ash, coarse aggregate and fine aggregate into a stirrer, stirring at a constant speed for about 30s, uniformly mixing, adding a polycarboxylic acid water reducing agent diluted solution and the balance of water, mixing for 120s, immediately pouring out, and performing a Ubber consistency test. And curing after the mold is filled, and carrying out subsequent strength and microscopic test.
[ EXAMPLE IV ]
The dry and hard pavement concrete of the embodiment is prepared from the following materials:
264Kg of ordinary portland cement, 66Kg of superfine composite mineral admixture (prepared by the method of the embodiment one way), 84Kg of corn straw ash (prepared by the method of the embodiment two), 1.2Kg of latex powder, 1390.6Kg of coarse aggregate, 669.9Kg of fine aggregate, 6.6Kg of polycarboxylic acid water reducer and 113Kg of water.
The preparation method comprises the following steps:
(1) Mixing and uniformly stirring the calcined corn straw ash and the latex powder, adding water with the volume being at least one time of that of the powder, and performing ultrasonic dispersion to obtain a dispersion liquid of the biomass ash and the latex powder, wherein the ultrasonic dispersion power is 500W, and the ultrasonic dispersion treatment time is 30min;
(2) Placing the dispersion liquid of the biomass ash and the latex powder into a suction filter for suction filtration, and drying at 90 ℃ for 4 hours to obtain a mixture of the modified biomass ash and the latex powder;
(3) Mixing a water reducing agent with 1/4 of the required water amount to obtain a water reducing agent diluted solution;
(4) Pouring cement, the superfine composite mineral admixture, the modified biomass ash and latex powder mixture, the coarse aggregate and the fine aggregate into a stirrer, uniformly stirring for about 30s, adding the polycarboxylic acid water reducing agent diluted solution and the balance of water after uniformly mixing, immediately pouring out after mixing for 120s, and carrying out a Weibo consistency test. And curing after the die is filled, and carrying out subsequent strength and microscopic test.
[ EXAMPLE V ]
The dry and hard pavement concrete of the embodiment is prepared from the following materials:
231Kg of ordinary portland cement, 99Kg of superfine composite mineral admixture (prepared by the method of the embodiment), 51Kg of corn straw ash (prepared by the method of the embodiment II), 0.8Kg of latex powder, 1390.6Kg of coarse aggregate, 669.9Kg of fine aggregate, 6.6Kg of polycarboxylic acid water reducer, and 113Kg of water.
The preparation method is the same as the fourth embodiment.
[ Performance test ]
The dry and hard pavement concrete puffy consistency and the strength of each age period obtained according to the mixing ratio are shown in table 2 and figure 1:
TABLE 2
| Sample number | Weibo consistency/s |
| C-0 (example three, comparative) | 109.0 |
| C-1 (example four) | 62.7 |
| C-2 (example five) | 96.6 |
As shown by the data in Table 2, the samples (C-1 and C-2) with the superfine composite mineral blend added have much lower Weibo consistency than the control, especially example four, and the Weibo consistency is reduced by 46.3s compared to the control under the same water-cement ratio. Under the micro-scale coordination effect of the superfine composite mineral admixture, the superfine composite mineral admixture effectively solves the problem of low workability of the biomass ash road surface concrete, reduces the viscosity of the concrete, reduces the water demand of a concrete system on the premise of realizing the same vitamin density, and improves the mechanical strength of the concrete.
As shown in FIG. 1, compared with a comparison sample, the biomass ash modified dry and hard pavement concrete prepared from the superfine composite mineral admixture has the compressive strength of 3d, 7d and 28d which is stronger than that of the comparison sample, and particularly the later mechanical strength is obviously higher than that of the comparison sample, the compressive strength can be improved by 15.6% at most, and the flexural strength can be improved by 6% at most. The superfine composite mineral admixture is added, so that the filling effect on pores generated by fibrous particles beaten by the biomass ash is achieved, the volcanic ash effect can effectively react with calcium hydroxide generated in the cement hydration process, and the generated hydrated calcium silicate gel is filled in the pores, so that the strength of the concrete is improved to a certain extent; the latex powder and the biomass ash have a synergistic effect, and the latex powder can better perform a complexing effect in an alkaline environment provided by the biomass ash, so that the compactness of a concrete structure is further improved; unreacted latex powder can also be distributed in various areas of the concrete structure to form a biofilm structure, so that loose pores formed by the biomass ash fibrous particles in the concrete are effectively blocked.
Fig. 2 shows the concrete quality and quality loss at different freezing and thawing times for three examples. When the freeze-thaw cycle times reach 150 times, the mass loss of the comparative sample is 1.71 percent; the maximum number of freeze-thaw cycles tolerated for the control was 275, at which time the mass loss for the control was 12.9%. The concrete of examples C-1 and C-2 still did not suffer a significant loss of quality when the number of freeze-thaw cycles reached 450 times compared to the control. The mixing of the superfine composite mineral admixture and the modification of the latex powder to the biomass ash obviously improve the frost resistance of the dry and hard pavement concrete, and the frost resistance of the concrete is improved by about 1.6 times.
Fig. 3 shows mercury intrusion data for three examples. The most probable pore diameters of the three samples showed a significant decrease, respectively 50.3496nm, 32.4042nm and 40.2640nm. The median pore diameter in the control was 19.13nm and the porosity was 10.6170%. The biomass ash modified dry and hard pavement concrete prepared by the superfine composite mineral admixture has the lowest median pore diameter of 13.49nm and the porosity of 5.9458 percent. The porosity of the concrete is greatly reduced, which shows that the density of the internal structure of the concrete can be greatly improved by doping the superfine composite mineral admixture and modifying the biomass ash by the latex powder, so that the durability and the strength of the concrete are improved.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The high-fracture-resistance biomass ash modified ultrafine powder dry-hard pavement concrete is characterized in that,
the raw materials of the material comprise cement, superfine composite mineral admixture, biomass ash, latex powder, aggregate, water reducing agent and water,
the preparation method comprises the following steps:
a1. carrying out secondary calcination on the biomass ash;
a2. mixing the calcined biomass ash and the latex powder with a proper amount of water, uniformly stirring, performing ultrasonic dispersion, and removing water in the dispersion liquid to obtain a modified biomass ash and latex powder mixture;
a3. mixing a water reducing agent with a proper amount of water to obtain a water reducing agent diluted solution;
a4. and mixing the cement, the superfine composite mineral admixture, the modified biomass ash and latex powder mixture, the aggregate, the water reducer diluted solution and the balance of water, and uniformly stirring to obtain the high-bending-resistance biomass ash modified superfine dry hard pavement concrete.
2. The high flexural resistance biomass ash modified ultrafine powder dry hard pavement concrete according to claim 1, wherein the secondary calcination of the biomass ash comprises:
a11. carrying out primary calcination treatment on the dried biomass ash at the temperature of 200-400 ℃;
a12. after the first calcination treatment, quenching is carried out, and the second calcination treatment is carried out at 600-800 ℃.
3. The high bending resistance biomass ash modified ultrafine powder dry hard pavement concrete according to claim 2, wherein the biomass ash is dried at 100-150 ℃ before being subjected to the first calcination treatment.
4. The high bending resistance biomass ash modified ultrafine powder dry hard pavement concrete according to claim 3, wherein the biomass ash after the second calcination treatment is ground for 20-40min.
5. The high bending resistance biomass ash modified ultrafine powder dry hard pavement concrete according to claim 1, 2, 3 or 4, characterized in that the mass ratio of the biomass ash after calcination to the latex powder is (40-100) to (0.3-2.0).
6. The high anti-bending biomass ash modified ultrafine powder dry hard pavement concrete according to claim 1, 2, 3 or 4, wherein the power of ultrasonic dispersion is 400-600W, and the ultrasonic dispersion treatment is 20-40min.
7. The high bending resistance biomass ash modified ultrafine powder dry and hard pavement concrete according to claim 1, wherein the ultrafine composite mineral admixture is obtained by blending two or more than two kinds of minerals, drying and ultrafine grinding, the minerals are fly ash, slag, coal gangue, clay brick or low-alkali red mud, and the specific surface area of the ground composite mineral admixture is 700-800kg/m 2 。
8. The high-fracture-resistance biomass ash modified ultrafine powder dry and hard pavement concrete according to claim 1, which is characterized by comprising the following raw materials in parts by weight:
9. the high flexural resistance biomass ash modified ultrafine powder dry hard pavement concrete according to claim 1,
the aggregate consists of coarse aggregate and fine aggregate, the mass ratio of the coarse aggregate to the fine aggregate is (1.5-2.5) to 1,
the coarse aggregate comprises two graded machine-made gravels of 5-20mm and/or 20-40mm, and the fine aggregate is river sand with fineness modulus of 2.8-3.0.
10. The process for preparing high flexural strength biomass ash modified ultrafine powder dry hard pavement concrete as claimed in any one of claims 1 to 9, which comprises:
the method comprises the following steps:
a1. carrying out secondary calcination on the biomass ash;
a2. mixing the calcined biomass ash and the latex powder with a proper amount of water, uniformly stirring, performing ultrasonic dispersion, and removing water in the dispersion liquid to obtain a modified biomass ash and latex powder mixture;
a3. mixing a water reducing agent with a proper amount of water to obtain a water reducing agent diluted solution;
a4. and mixing the cement, the superfine composite mineral admixture, the modified biomass ash and latex powder mixture, the aggregate, the water reducer diluted solution and the balance of water, and uniformly stirring to obtain the high-bending-resistance biomass ash modified superfine dry and hard pavement concrete.
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