CN115403301B - Additive for preparing high-performance concrete admixture from coal gangue and application of additive - Google Patents
Additive for preparing high-performance concrete admixture from coal gangue and application of additive Download PDFInfo
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- CN115403301B CN115403301B CN202211239832.XA CN202211239832A CN115403301B CN 115403301 B CN115403301 B CN 115403301B CN 202211239832 A CN202211239832 A CN 202211239832A CN 115403301 B CN115403301 B CN 115403301B
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- 239000000654 additive Substances 0.000 title claims abstract description 52
- 230000000996 additive effect Effects 0.000 title claims abstract description 47
- 239000003245 coal Substances 0.000 title claims abstract description 43
- 239000004574 high-performance concrete Substances 0.000 title claims abstract description 12
- 239000004567 concrete Substances 0.000 claims abstract description 121
- 238000002485 combustion reaction Methods 0.000 claims abstract description 34
- 230000002269 spontaneous effect Effects 0.000 claims abstract description 33
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims abstract description 22
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 8
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 8
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 8
- 239000011777 magnesium Substances 0.000 claims abstract description 8
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 7
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 7
- 229940061605 tetrasodium glutamate diacetate Drugs 0.000 claims abstract description 7
- UZVUJVFQFNHRSY-OUTKXMMCSA-J tetrasodium;(2s)-2-[bis(carboxylatomethyl)amino]pentanedioate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]C(=O)CC[C@@H](C([O-])=O)N(CC([O-])=O)CC([O-])=O UZVUJVFQFNHRSY-OUTKXMMCSA-J 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 38
- 239000000203 mixture Substances 0.000 claims description 22
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 15
- 239000002245 particle Substances 0.000 claims description 12
- 238000002360 preparation method Methods 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 12
- -1 polydimethylsiloxane Polymers 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 9
- 239000007864 aqueous solution Substances 0.000 claims description 8
- 239000002910 solid waste Substances 0.000 claims description 8
- HXKKHQJGJAFBHI-UHFFFAOYSA-N 1-aminopropan-2-ol Chemical compound CC(O)CN HXKKHQJGJAFBHI-UHFFFAOYSA-N 0.000 claims description 6
- 239000013530 defoamer Substances 0.000 claims description 6
- 235000019738 Limestone Nutrition 0.000 claims description 5
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 5
- 239000006028 limestone Substances 0.000 claims description 5
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 5
- 229920006395 saturated elastomer Polymers 0.000 claims description 5
- 239000002893 slag Substances 0.000 claims description 5
- SLINHMUFWFWBMU-UHFFFAOYSA-N Triisopropanolamine Chemical compound CC(O)CN(CC(C)O)CC(C)O SLINHMUFWFWBMU-UHFFFAOYSA-N 0.000 claims description 4
- 229940102253 isopropanolamine Drugs 0.000 claims description 4
- LVTYICIALWPMFW-UHFFFAOYSA-N diisopropanolamine Chemical compound CC(O)CNCC(C)O LVTYICIALWPMFW-UHFFFAOYSA-N 0.000 claims description 3
- 229940043276 diisopropanolamine Drugs 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims 1
- 229920001451 polypropylene glycol Polymers 0.000 claims 1
- 238000013329 compounding Methods 0.000 abstract description 2
- 239000012047 saturated solution Substances 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 21
- 239000003638 chemical reducing agent Substances 0.000 description 17
- 238000005086 pumping Methods 0.000 description 15
- 238000010276 construction Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 230000004907 flux Effects 0.000 description 9
- 238000009472 formulation Methods 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000004568 cement Substances 0.000 description 6
- 230000008859 change Effects 0.000 description 6
- 229920005646 polycarboxylate Polymers 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 238000006703 hydration reaction Methods 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 230000036571 hydration Effects 0.000 description 3
- 229910010272 inorganic material Inorganic materials 0.000 description 3
- 239000011147 inorganic material Substances 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 230000002441 reversible effect Effects 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 238000007655 standard test method Methods 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 239000012976 trial formulation Substances 0.000 description 3
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 2
- 229920005830 Polyurethane Foam Polymers 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 229910001424 calcium ion Inorganic materials 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- RBNPOMFGQQGHHO-UHFFFAOYSA-N glyceric acid Chemical compound OCC(O)C(O)=O RBNPOMFGQQGHHO-UHFFFAOYSA-N 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 239000011496 polyurethane foam Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000005526 G1 to G0 transition Effects 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- DLTWOYCDRWJVIM-JEDNCBNOSA-M sodium;(2s)-2-[bis(carboxymethyl)amino]-5-hydroxy-5-oxopentanoate Chemical compound [Na+].OC(=O)CC[C@@H](C([O-])=O)N(CC(O)=O)CC(O)=O DLTWOYCDRWJVIM-JEDNCBNOSA-M 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- 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)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application discloses an additive for preparing a high-performance concrete admixture from spontaneous combustion coal gangue and application thereof, wherein the additive is prepared by compounding modified nano silica sol, magnesium fluosilicate, tetrasodium glutamate diacetate and calcium hydroxide saturated solution; the additive can reduce the problems of high viscosity and high adsorptivity of the spontaneous combustion coal gangue additive in concrete application, can solve the problem of large slump loss of the spontaneous combustion coal gangue additive in concrete application, and can reduce air holes on the surface of the concrete, so that the spontaneous combustion coal gangue additive can be easily applied in high-performance concrete in a large quantity.
Description
Technical Field
The application relates to an additive for preparing a high-performance concrete admixture from spontaneous combustion coal gangue and application thereof, and belongs to the technical field of building materials.
Background
The gangue is solid waste discharged in the coal mining process and the coal washing process, and the main component of the gangue is Al 2 O 3 、SiO 2 In addition, fe is contained in different amounts 2 O 3 The main utilization modes of the gangue include power generation, building material product preparation, mine goaf filling, mine subsidence area backfilling and the like. Coal gangue is one of the industrial waste residues with the largest accumulation amount and annual production amount and the widest distribution in China. Due to the factors of the component characteristics, the piling mode, the piling topography and the like of the gangue, a large amount of open-air piled gangue hills for a long time not only encroach on agricultural cultivated lands and destroy original vegetation on the ground surface, but also pollute soil and groundwater around a mining area by the gangue leaching water. In the process of the open-air stockpiling of a large amount of gangue, particularly FeS and other substances in the gangue are oxidized by air, and when heat is continuously accumulated and reaches a burning point, inflammable and combustible substances in the gangue are also caused to spontaneously ignite, so that the carbon content of the gangue after spontaneous combustion is reduced, and the gangue can be used as an admixture in concrete.
The application of the cement and cement mixture prepared from the coal gangue is earlier at home and abroad, but the consumption is less (< 5%) because the technical bottleneck in the actual production process is difficult to break through. The spontaneous combustion coal gangue has a pozzolanic effect, so that the spontaneous combustion coal gangue has great advantages in the aspect of concrete durability, and particularly in the aspect of preparing anti-erosion concrete, the spontaneous combustion coal gangue is more and more paid attention. In recent years, spontaneous combustion coal gangue is used as a raw material of a concrete admixture to be produced and applied in concrete, and has obvious economic benefit compared with brick making, road repairing and filling. However, the spontaneous combustion coal gangue powder is of a porous structure, the porosity reaches more than 60%, the self-combustion coal gangue powder has the characteristics of high water demand and strong adsorptivity, the phenomena of high viscosity and loss of concrete and more appearance pores on the surface of the formed concrete are caused, meanwhile, the pumping construction process causes the increase of concrete pumping pressure due to the high viscosity, the increase of the pumping pressure causes the crushing of concrete aggregate, and the problems of pump loss and low rebound strength are further aggravated.
In order to realize a great deal of application of spontaneous combustion coal gangue as an admixture in concrete, the current concrete preparation aspect adopts a mode of increasing the dosage of a polycarboxylate water reducer and simultaneously improving the pumping pressure of a concrete pump truck, but the technology and the technology are not mature, and the defects are obvious, and the concrete is as follows: (1) The mode of increasing the dosage of the high-performance polycarboxylate water reducer solves the slump loss of concrete, but the concentration of the water reducer is increased, so that the sensitivity of the concrete is increased, the concrete is easy to lag behind the water shutoff pump, meanwhile, the dosage of the water reducer is large and brings more concrete bubbles, so that more surface pores are formed, and the durability index (permeation resistance, erosion resistance and the like) of the concrete is reduced; (2) The mode of increasing the pumping pressure of the concrete pump truck can crush part of coarse and fine aggregates, small-particle-size particles are increased, the water demand of concrete is increased, the concrete mobility performance loss is large, the construction performance is poor, and the surface rebound strength is reduced due to the reduction of coarse aggregates; (3) In addition, in the actual construction process, the viscosity of the concrete is reduced by adopting a mode of improving the water consumption, so that the strength is obviously reduced.
Disclosure of Invention
Aiming at the problems, the application provides an additive for preparing a high-performance concrete admixture from spontaneous combustion coal gangue, which is prepared by compounding modified nano silica sol, magnesium fluosilicate, tetra sodium glutamate diacetate and calcium hydroxide saturated solution; the additive can reduce the problems of high viscosity and high adsorptivity of the spontaneous combustion coal gangue additive in concrete application, can solve the problem of large slump loss of the spontaneous combustion coal gangue additive in concrete application, and can reduce air holes on the surface of the concrete, so that the spontaneous combustion coal gangue additive can be easily applied in high-performance concrete in a large quantity.
The technical scheme of the application is as follows: the additive for preparing the high-performance concrete admixture by self-igniting coal gangue is characterized by comprising the following components in parts by weight: modified nano silica Sol (SiO) 2 The content is more than 10 percent, the particle diameter is less than 10 nm) 30-40 parts, magnesium fluosilicate 20-30 parts, monosodium glutamate diacetate 10-20 parts, calcium hydroxide saturated aqueous solution 20-30 parts and water 10-20 parts.
The preparation method of the modified nano silica sol comprises the following steps: mixing silica sol, glycerol, isopropanolamine, defoamer and water; the mass ratio of the 5 components is 35-45:10-20:20-30:0.5-1:29-39.
The isopropanolamine comprises one or more of triisopropanolamine, diisopropanolamine and diethanol monoisopropanolamine.
The defoaming agent can be one or more than two of polydimethylsiloxane, polyoxyethylene glycerol ether and polyoxypropylene ethylene oxide glycerol ether.
The specific technical indexes of the silica sol are as follows: siO (SiO) 2 30-40% of Na, pH value of 9.0-11.0 2 The O content is less than or equal to 0.5%, the particle diameter is less than 10nm, and the viscosity is less than or equal to 2.0mm 2 S, stationary phase 12 months.
The application also discloses a preparation method (application of the additive) of the spontaneous combustion coal gangue-based solid waste concrete admixture, which comprises the following steps: according to the mass ratio, 60-80% of spontaneous combustion coal gangue, 10-30% of limestone and 10-20% of slag are mixed, the mixing amount of the additive is 0.3-0.6% of the total mass of the admixture, and the additive is added in the process of milling the admixture.
The application also discloses the application of the admixture in concrete, and the dosage of the admixture is 60-100kg/m 3 。
The technical principle of the application is as follows: (1) The coal gangue particles of the pozzolanic have a hollow structure, the nano silica sol is hydrated rapidly when meeting water to block the porous structure on the surfaces of the coal gangue particles, so that the internal specific surface area of the admixture is reduced, the water demand in the coal gangue particles is reduced, the condition of absorbing the admixture is reduced, and the problem of viscosity of concrete is solved. (2) The calcium hydroxide solution provides calcium ions to ensure that the concrete forms sufficient hydration products. (3) The magnesium fluosilicate is adsorbed on the surface of the gangue powder admixture particles to form a layer of protective film and can improve the hardness of the particles; (4) The tetrasodium glutamate diacetate is complexed with metal ions such as calcium ions, aluminum ions and the like, so that a sufficient hydration product is formed by continuous reaction for a long time, and the pore structure inside the gangue particles can be completely blocked. (5) The additive mainly adopts inorganic materials, can permanently seal the void structure in the spontaneous combustion gangue powder, solves the problems of high viscosity and large loss of the spontaneous combustion gangue admixture in the application of concrete, and the inorganic materials participate in hydration reaction similar to hydration products of cement, so the additive does not influence the durability of the concrete.
The application has the technical effects that:
1. the nano silica sol is hydrated rapidly when meeting water to block the porous structure on the surface of the gangue particles, so that the internal specific surface area of the admixture is reduced, and the problems of high viscosity and large loss of the spontaneous combustion gangue admixture in concrete application are solved; meanwhile, the problem that the pumping pressure needs to be improved in the concrete construction using the spontaneous combustion coal gangue admixture is solved;
2. the admixture of the application takes inorganic materials as main materials, can permanently seal the void structure in the self-ignition coal gangue powder, and solves the problem that the surface of concrete has more pores after the self-ignition coal gangue admixture is used by the concrete;
3. by adopting the technology of the application, the high-concentration polycarboxylic acid water reducer is not needed, and the problem of sensitivity of concrete caused by high-concentration polycarboxylic acid in the concrete using the spontaneous combustion coal gangue admixture is solved.
Detailed Description
The effects thereof are described below with reference to examples.
Example 1: preparation of additives
Preparation of modified nano silica sol: silica Sol (SiO) 2 30 percent of glycerol, triisopropanolamine, defoamer (polydimethylsiloxane) and water are stirred and mixed uniformly to prepare the polyurethane foam; the mass ratio of the 5 components is 35.2:15:25:0.8:24.
the additive comprises the following components: 35 parts of modified nano silica sol, 25 parts of magnesium fluosilicate, 15 parts of tetrasodium glutamate diacetate, 25 parts of calcium hydroxide saturated aqueous solution and 15 parts of water, and uniformly mixing the raw materials.
Blending of examples 4-6 was performed using the additive prepared in example 1.
Example 2: preparation of additives
Preparation of modified nano silica sol: silica Sol (SiO) 2 30 percent of glycerol, diisopropanolamine, defoamer (polydimethylsiloxane) and water are stirred and mixed uniformly to prepare the aqueous emulsion; the mass ratio of the 5 components is 40:14.5:25:0.5:20.
the additive comprises the following components: 32 parts of modified nano silica sol, 28 parts of magnesium fluosilicate, 16 parts of tetrasodium glutamate diacetate, 24 parts of calcium hydroxide saturated aqueous solution and 15 parts of water, and uniformly mixing the raw materials.
Example 3: preparation of additives
Preparation of modified nano silica sol: silica Sol (SiO) 2 30 percent of glycerol, triisopropanolamine, defoamer (polydimethylsiloxane) and water are stirred and mixed uniformly to prepare the polyurethane foam; the mass ratio of the 5 components is 36:14:25:1:24.
the additive comprises the following components: 38 parts of modified nano silica sol, 22 parts of magnesium fluosilicate, 17 parts of tetrasodium glutamate diacetate, 23 parts of calcium hydroxide saturated aqueous solution and 15 parts of water, and uniformly mixing the raw materials.
Example 4: application effects
According to the trial formulation of the C30 high-performance concrete, the construction effects of the concrete before and after the admixture is doped with the additive are compared as follows:
preparing a solid waste admixture of spontaneous combustion coal gangue: the admixture is prepared according to the admixture amount of 60 percent of spontaneous combustion coal gangue, 30 percent of limestone, 10 percent of slag and 0.5 percent of additiveMixing material, and the specific surface area of the mixing material is 560+/-10 m 2 Per kg, then cement, sand, crushed stone, water reducer (polycarboxylate water reducer aqueous solution) and water were added according to the formulation of table 1 to prepare concrete.
Testing the flowability and the reverse extraction time of concrete according to GB/T50080 Standard of common concrete mixture Performance test method; testing the 28d strength of concrete according to GB/T50081 standard of common concrete mechanical property test method; the electric flux and the rebound strength of the concrete are tested according to GB/T50082 Standard test method for the long-term Performance and durability of common concrete.
The concrete formulation and product properties are shown in Table 1.
Table 1 concrete formulation and product properties
Remarks: (1) A, B, C is a test in which no additive is added during the production of the gangue admixture; test A, B, C is to add additive concrete in the production process of gangue admixture; (2) the flow property index detection is slump and expansion; (3) Adopting electric flux index to reflect the number and the size of air holes in the concrete; (4) The construction rebound strength index is used for testing the change of the pump pressure of the concrete in the pumping process; (5) The concentration of the water reducer in the concrete mixture ratio is 18% by A, B, C, and the concentration of the water reducer in the concrete mixture ratio is 12% by test A, B, C.
The experimental data above show that: (1) After the additive is adopted in the gangue admixture, the concrete pouring time is obviously accelerated, the concrete slump and the expansion degree are increased, and the concrete viscosity is obviously reduced; (2) The electric flux index is reduced, which indicates that the capillary aperture in the concrete is reduced, indirectly verifies that the appearance bubbles of the formed concrete are reduced, and the surface is smoother. (3) The rebound strength of the concrete is improved, which indicates that the aggregate is less damaged in the concrete pumping process, the pumping pressure of the concrete pump truck is reduced, and the concrete volume stability is good. (4) As the amount of gangue admixture increases, the performance of the concrete in use A, B, C decreases, but the performance of the concrete in test A, B, C does not change significantly.
Example 5: application effects
According to the trial formulation of the C40 high-performance concrete, the construction effects of the concrete before and after the admixture is doped with the additive are compared as follows:
preparing a solid waste admixture of spontaneous combustion coal gangue: preparing a blend according to the blending amount of 70% of spontaneous combustion coal gangue, 20% of limestone, 10% of slag and 0.6% of additive, wherein the specific surface area of the blend is 560+/-10 m 2 Per kg, then cement, sand, crushed stone, water reducer (polycarboxylate water reducer aqueous solution) and water were added according to the formulation of table 1 to prepare concrete.
Testing the flowability and the reverse extraction time of concrete according to GB/T50080 Standard of common concrete mixture Performance test method; testing the 28d strength of concrete according to GB/T50081 standard of common concrete mechanical property test method; the electric flux and the rebound strength of the concrete are tested according to GB/T50082 Standard test method for the long-term Performance and durability of common concrete.
The concrete formulation and product properties are shown in Table 2.
Table 2 concrete formulation and product properties
Remarks: (1) A, B, C is a test in which no additive is added during the production of the gangue admixture; test A, B, C is to add additive concrete in the production process of gangue admixture; (2) the flow property index detection is slump and expansion; (3) Adopting electric flux index to reflect the number and the size of air holes in the concrete; (4) The construction rebound strength index is used for testing the change of the pump pressure of the concrete in the pumping process; (5) The concentration of the water reducer in the concrete mixture ratio is 18% by A, B, C, and the concentration of the water reducer in the concrete mixture ratio is 15% by test A, B, C.
The experimental data above show that: (1) After the additive is adopted in the gangue admixture, the concrete pouring time is obviously accelerated, the concrete slump and the expansion degree are increased, and the concrete viscosity is obviously reduced; (2) The electric flux index is reduced, which indicates that the capillary aperture in the concrete is reduced, indirectly verifies that the appearance bubbles of the formed concrete are reduced, and the surface is smoother. (3) The rebound strength of the concrete is improved, which indicates that the aggregate is less damaged in the concrete pumping process, the pumping pressure of the concrete pump truck is reduced, and the concrete volume stability is good. (4) As the amount of gangue admixture increases, the performance of the concrete in use A, B, C decreases, but the performance of the concrete in test A, B, C does not change significantly.
Example 6: application effects
According to the trial formulation of the C50 high-performance concrete, the construction effects of the concrete before and after the admixture is doped with the additive are compared as follows:
preparation of solid waste admixture of spontaneous combustion coal gangue, preparing admixture according to the admixture amount of 80% of spontaneous combustion coal gangue, 10% of limestone, 10% of slag and 0.6% of additive, wherein the specific surface area of the admixture is 560+/-10 m 2 Per kg, then cement, sand, crushed stone, water reducer (polycarboxylate water reducer aqueous solution) and water were added according to the formulation of table 1 to prepare concrete.
Testing the flowability and the reverse extraction time of concrete according to GB/T50080 Standard of common concrete mixture Performance test method; testing the 28d strength of concrete according to GB/T50081 standard of common concrete mechanical property test method; the electric flux and the rebound strength of the concrete are tested according to GB/T50082 Standard test method for the long-term Performance and durability of common concrete.
The concrete formulation and product properties are shown in Table 3.
Table 3 concrete formulation and product properties
Remarks: (1) A, B, C is a test in which no additive is added during the production of the gangue admixture; test A, B, C is a concrete with additives added during the production of gangue additives; (2) the flow property index detection is slump and expansion; (3) Adopting electric flux index to reflect the number and the size of air holes in the concrete; (4) The construction rebound strength index is used for testing the change of the pump pressure of the concrete in the pumping process; (5) The concentration of the water reducer in the concrete mixture ratio is 18% by A, B, C, and the concentration of the water reducer in the concrete mixture ratio is 12% by test A, B, C.
The experimental data above show that: (1) After the additive is adopted in the gangue admixture, the concrete pouring time is obviously accelerated, the concrete slump and the expansion degree are increased, and the concrete viscosity is obviously reduced; (2) The electric flux index is reduced, which indicates that the capillary aperture in the concrete is reduced, indirectly verifies that the appearance bubbles of the formed concrete are reduced, and the surface is smoother. (3) The rebound strength of the concrete is improved, which indicates that the aggregate is less damaged in the concrete pumping process, the pumping pressure of the concrete pump truck is reduced, and the concrete volume stability is good. (4) As the amount of gangue admixture increases, the performance of the concrete in use A, B, C decreases, but the performance of the concrete in test A, B, C does not change significantly.
Claims (7)
1. The additive for preparing the high-performance concrete admixture by self-igniting coal gangue is characterized by comprising the following components in parts by weight: 30-40 parts of modified nano silica sol, 20-30 parts of magnesium fluosilicate, 10-20 parts of tetrasodium glutamate diacetate, 20-30 parts of calcium hydroxide saturated aqueous solution and 10-20 parts of water;
the preparation method of the modified nano silica sol comprises the following steps: mixing silica sol, glycerol, isopropanolamine, defoamer and water; the mass ratio of the 5 components is 35-45:10-20:20-30:0.5-1:29-39; siO of the modified nano silica sol 2 The content is more than 10 percent, and the particle diameter is less than 10nm.
2. The additive of claim 1, wherein the isopropanolamine is one or more of triisopropanolamine, diisopropanolamine, and diethanol monoisopropanolamine.
3. The additive of claim 1, wherein the defoamer is one or more of polydimethylsiloxane, polyoxyethylene glyceryl ether, polyoxypropylene polyoxyethylene glyceryl ether.
4. The additive of claim 1, wherein the silica sol has the following technical specifications: siO (SiO) 2 30-40% of Na, pH value of 9.0-11.0 2 The O content is less than or equal to 0.5%, the particle diameter is less than 10nm, and the viscosity is less than or equal to 2.0mm 2 /s。
5. Use of the additive according to any one of claims 1 to 4 in spontaneous combustion coal gangue based solid waste concrete blends.
6. An spontaneous combustion coal gangue-based solid waste concrete admixture, which is characterized in that 60-80% of spontaneous combustion coal gangue, 10-30% of limestone and 10-20% of slag are mixed according to mass ratio, and then the additive of any one of claims 1-4 is added, wherein the additive amount is 0.3-0.6% of the total mass of the admixture.
7. The spontaneous combustion coal gangue based solid waste concrete admixture of claim 6 wherein the additive is added during the admixture grinding process.
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