CN106904847B - A method of low fever's complex cement is mutually prepared using discarded concrete Behavior of Hardened Cement Paste - Google Patents
A method of low fever's complex cement is mutually prepared using discarded concrete Behavior of Hardened Cement Paste Download PDFInfo
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- 239000004568 cement Substances 0.000 title claims abstract description 97
- 239000004567 concrete Substances 0.000 title claims abstract description 24
- 206010037660 Pyrexia Diseases 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000000843 powder Substances 0.000 claims abstract description 45
- 230000018044 dehydration Effects 0.000 claims abstract description 34
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 34
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 16
- 239000002994 raw material Substances 0.000 claims abstract description 15
- 238000002360 preparation method Methods 0.000 claims abstract description 10
- 150000004683 dihydrates Chemical class 0.000 claims abstract description 8
- 239000010440 gypsum Substances 0.000 claims abstract description 8
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 8
- 229910052938 sodium sulfate Inorganic materials 0.000 claims abstract description 8
- 235000011152 sodium sulphate Nutrition 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 238000000227 grinding Methods 0.000 claims description 24
- 239000004575 stone Substances 0.000 claims description 14
- 238000001354 calcination Methods 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 239000010881 fly ash Substances 0.000 claims description 5
- 239000004576 sand Substances 0.000 claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 239000003818 cinder Substances 0.000 claims description 3
- 239000012634 fragment Substances 0.000 claims description 3
- 239000008187 granular material Substances 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 238000007885 magnetic separation Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 11
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 230000008901 benefit Effects 0.000 abstract description 5
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 abstract 1
- 239000011575 calcium Substances 0.000 abstract 1
- 229910052791 calcium Inorganic materials 0.000 abstract 1
- 239000011398 Portland cement Substances 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 239000002245 particle Substances 0.000 description 9
- 238000009826 distribution Methods 0.000 description 8
- 239000008188 pellet Substances 0.000 description 5
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 239000003595 mist Substances 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000002910 solid waste Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000693 micelle Substances 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 239000007962 solid dispersion Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 241000537371 Fraxinus caroliniana Species 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 235000010891 Ptelea trifoliata Nutrition 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000013590 bulk material Substances 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000011806 microball Substances 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007787 solid Substances 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
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/246—Cements from oil shales, residues or waste other than slag from waste building materials, e.g. waste asbestos-cement products, demolition waste
-
- 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
- C04B7/14—Cements containing slag
-
- 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
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
-
- 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
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/26—Cements from oil shales, residues or waste other than slag from raw materials containing flue dust, i.e. fly ash
-
- 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
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
- Y02P40/121—Energy efficiency measures, e.g. improving or optimising the production methods
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Processing Of Solid Wastes (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
A method of low fever's complex cement mutually being prepared using discarded concrete Behavior of Hardened Cement Paste, belongs to field of cement production.The present invention solves the problems, such as discarded concrete Behavior of Hardened Cement Paste phase resource utilization, while can also realize that the large dosage of industrial residue uses.The cement includes the raw material of following weight part ratio: dehydration Behavior of Hardened Cement Paste powder 50%-70%, dihydrate gypsum 2%-5%, anhydrous sodium sulphate 1.5%-3%, miberal powder 25%-40%, other mixing materials 0%-20%.Preparation process of the present invention is simple, the cement produced according to this preparation method, discarded concrete Behavior of Hardened Cement Paste is mutually efficiently utilized, calcium flouride substantially reduces the production cost of cement, effectively reduce the consumption to natural resources and the pollution to environment, with apparent low-carbon environment-friendly effect, comprehensive benefit is significant.
Description
Technical field
A method of low fever's complex cement mutually being prepared using discarded concrete Behavior of Hardened Cement Paste, belongs to field of cement production.
Background technique
With the implementation of the strategy of sustainable development, cement industry bring resource, the energy, environmental problem, which become, restricts its hair
The principal element of exhibition.Portland clinker is used less, mostly produces cement using solid waste as far as possible, and being one has environmental protection
The project of meaning and economic value.As the important composition of solid waste, it is current solid wastes recycling that discarded concrete, which utilizes,
The importance utilized.Recycled concrete can preferably solve the problems, such as the regeneration of discarded concrete, and to guarantor
The natural resources such as retaining ring border, saving sandstone are of great significance, but most to economic cost highest, carrying capacity of environment in discarded concrete
Simultaneously effective use is not implemented in the Behavior of Hardened Cement Paste phase of weight.
It is current studies have shown that petrifying water mudstone calcines the dehydration Behavior of Hardened Cement Paste that can get greater activity at a certain temperature,
With certain rehydration ability.But the petrifying water mudstone micro powder granule separated from discarded concrete is thicker, need into
The fineness of one step grinding to cement granules can be used as cementitious material.But in practical grinding process, it is dehydrated Behavior of Hardened Cement Paste pole
Easily there is " slimeball, viscous mill ", " micelle is poly- " problem, causes mill efficiency to reduce, powder particles average grain diameter is much larger than cement
Grain, limits the performance of its gelling property.And allow to that Behavior of Hardened Cement Paste superfine grinding will be dehydrated, dehydration Behavior of Hardened Cement Paste micro mist is using
When the problem of there are still setting time is short, water requirement is big, intensity is low etc..The especially low problem of intensity, significantly limits it
Application range.Therefore, to the key for being modified to efficiently utilize for it of the mechanical property of dehydration Behavior of Hardened Cement Paste.When dehydration water
The silicon ash of mudstone and high activity is compound when making cementitious material, and mechanical property increases but water requiremen significantly increases；As powder
Coal ash, miberal powder exciting agent when, the flyash of large dosage, miberal powder and dehydration Behavior of Hardened Cement Paste be only it is simple compound after separate compiling,
And having not been changed the partial size of dehydration water cement stone powder and the even cause of cementitious material cannot be guaranteed, mechanical property is still lower.
Analysis shows the lower basic reason of intensity of dehydration Behavior of Hardened Cement Paste gelling system is loose porous dehydration cement
The pellet hardness of stone is extremely low, and this aspect causes the partial size after dehydration Behavior of Hardened Cement Paste grinding still partially thick, influences its gelling ability
It plays；Another aspect gelling system cannot form effective support construction and keep later period mechanical property bad.Only overcome particle
It is adversely affected in terms of the low bring two of hardness, could thoroughly solve the problems, such as that dehydration Behavior of Hardened Cement Paste gelling system intensity is low.
Summary of the invention
The object of the present invention is to provide a kind of methods for mutually preparing low fever's complex cement using discarded concrete Behavior of Hardened Cement Paste, should
Method give full play to dehydration Behavior of Hardened Cement Paste easily grind, good gelling property the characteristics of, low fever's complex cement is prepared, to realize dehydration
The purpose that Behavior of Hardened Cement Paste efficiently utilizes.
The basic ideas of present invention realization goal of the invention:
Miberal powder has characteristics that the activity of itself is higher as common supplementary cementitious material, can effectively improve cement base
The later strength of material；Pellet hardness is very high, and can other cementitious materials be played with microballoon mill effect, it is whole to improve cementitious material
Grain composition；High pellet hardness can have good micro-aggregate skeletal support effect to the formation of gelling system.Therefore, originally
Microballoon mill effect and micro aggregates effect of the invention using miberal powder, solid dispersion and grinding aid using miberal powder as dehydration Behavior of Hardened Cement Paste
Agent adds other a small amount of mixing materials and additive, the superfine grinding and gelling system of dehydration Behavior of Hardened Cement Paste is realized after abundant grinding
The even cause of height, prepare low fever's complex cement of excellent in mechanical performance.
The method proposed by the present invention for mutually preparing low fever's complex cement using discarded concrete Behavior of Hardened Cement Paste,
Raw material composition and its mass percent: dehydration Behavior of Hardened Cement Paste powder 50%-70%, dihydrate gypsum 2%-5%, anhydrous sodium sulphate
1.5%-3%, miberal powder 25%-40%, other mixing materials 0%-20%.
The preparation method includes: calcine technology and grinding process, and specific method process is as follows:
Step 1, calcine: by the hardened cement stone powder isolated in discarded concrete 600 DEG C -800 DEG C at a temperature of
Low temperature calcination 30min or more can be realized the gelling regeneration of Behavior of Hardened Cement Paste phase, dehydration Behavior of Hardened Cement Paste powder be made.Temperature is lower to forge
The burning time is longer, and the calcination time upper limit is rationally determined with economy and production efficiency, and general calcination time 90min is enough, the time
Too long energy consumption increases.
Step 2, preparation raw material (mass percent): dehydration Behavior of Hardened Cement Paste powder 50%-70%, dihydrate gypsum 2%-5%, anhydrous sodium sulphate
1.5%-3%, miberal powder 25%-40%, other mixing materials 0%-20%, each component mix in proportion.
Step 3, grinding: raw material grinding to the granularity that step 2 is prepared is crossed into 0.08mm square hole screen and tails over no more than 2%, compare table
Area is not less than 400m2/ kg is to get low fever's complex cement.
The hardened cement stone powder is the hardened cement stone powder isolated in discarded concrete shattering process；It is described
Miberal powder be to meet graining blast-furnace cinder micro-powder as defined in GB/T 18046-2008 standard, removed through magnetic separation for granulated blast-furnace slag
Grinding reaches specific surface area >=300 m after iron processing2/ kg is made, wherein superfine graining Blast Furnace Ore of the partial size less than 30 μm
Slag micro mist accounts for 70% of gross mass or more；Other mixing materials can be flyash, red mud, the powder in artificial sand, CHARACTERISTICS OF TAILINGS SAND, bastard coal
The activity harmless to concrete such as stone, stone pit stone fragment and inertia industrial residue, need to be crushed to bulk material and pass through
0.15mm square hole screen is tailed over no more than 5%, and for example the powders such as flyash can then be not required to broken directly use, as raw material humidity needs elder generation
Drying is crushed again.
The invention has the following advantages:
(1) good mechanical property
The cement of preparation method production has preferable early strength function, and 3d intensity is greater than 30 MPa, hence it is evident that is higher than PO
The 3d intensity of 42.5 ordinary portland cements.And 28d intensity is not less than 45MPa, with 42.5 ordinary portland cement phase of PO
When.
(2) it eliminates slimeball and glues mill problem, grinding is more efficient
Using industrial residues such as the miberal powders of high pellet hardness as the solid dispersion and grinding aid of dehydration Behavior of Hardened Cement Paste, overcome
" slimeball, viscous mill " and " micelle is poly- " problem when dehydration Behavior of Hardened Cement Paste separate grinding, realize the superfine grinding for being dehydrated Behavior of Hardened Cement Paste,
Mill efficiency is 3-5 times of ordinary portland cement.
(3) easy fired, low-carbon environment-friendly
The gelling ability that can restore discarded concrete Behavior of Hardened Cement Paste phase through 600-800 DEG C of low temperature calcination, obtains high activity
It is dehydrated Behavior of Hardened Cement Paste.Simultaneously in calcination process, Behavior of Hardened Cement Paste mutually no longer discharges CO2, grinding process is using industrial residue as solid
Dispersing agent and grinding aid, entire production process energy consumption is extremely low, low-carbon environment-friendly.
(4) cost of raw material is cheap
The primary raw material of the preparation method is discarded concrete Behavior of Hardened Cement Paste phase, industrial residue, can be obtained through simple process
Meet the cementitious material of actual operation requirements, cost is compared with the cheap many of cement clinker production technology.
(5) significant economic benefit, environmental benefit and social benefit
The novel low fever's complex cement mutually prepared using discarded concrete Behavior of Hardened Cement Paste, can slow down in cement industry to clay
With the too fast consumption of the non-renewable resources such as lime stone mud, to greatest extent using the use value of building waste and industrial residue with
Surcharge turns waste into wealth discarded concrete and industrial residue, reduces the various problem of environmental pollutions of industrial residue bring.
Detailed description of the invention
Fig. 1 is cement granularity distribution histogram, wherein figure a is dehydration Behavior of Hardened Cement Paste particle size distribution histogram, (b) low fever is compound
Cement granularity distribution histogram, (c) portland cement particle size distribution histogram.
Specific embodiment
Embodiment 1:
1, prepared by low fever's complex cement
Low fever's complex cement is mutually prepared using discarded concrete Behavior of Hardened Cement Paste, cement raw material composition and its mass percent are such as
Under: dehydration Behavior of Hardened Cement Paste powder 57%, dihydrate gypsum 3%, anhydrous sodium sulphate 2%, miberal powder 28%, flyash 10%.
The preparation process: the hardened cement stone powder isolated in discarded concrete is forged in 700 DEG C of at a temperature of low temperature
1h is burnt, dehydration Behavior of Hardened Cement Paste powder is made；Behavior of Hardened Cement Paste powder and above-mentioned raw materials will be dehydrated by formula rate combined grinding to granularity mistake
0.08mm square hole screen is tailed over no more than 2%, specific surface area not less than 400m2/ kg is to get low fever's complex cement.Survey the cement
It crosses 0.08mm square hole screen and tails over 1.6%, specific surface area 410m2/kg.Meanwhile by pure dehydration Behavior of Hardened Cement Paste powder grinding at micro mist to make
Control.
2, the basic performance of low fever's complex cement
(1) size distribution
Shown in distribution of particles such as Fig. 1 (a) after pure dehydration Behavior of Hardened Cement Paste grinding, as can be seen from Figure in its 10-100 μ m
Particle it is relatively more, measure its average grain diameter be 30.38 μm.The size distribution of low fever's complex cement is shown in Fig. 1 (b), with Fig. 1
(a) it compares, the particle in 10-100 μ m significantly reduces, and the particle in 1-10 μ m is opposite to be increased, and measures its average grain
Diameter is 11.39 μm.This illustrates that high pellet hardness powder during the preparation of low fever's complex cement, has very dehydration Behavior of Hardened Cement Paste
Good micro- ball action, is obviously reduced its partial size.The fineness of low fever's complex cement of raw material mixed powder mill 10min preparation has been omited
Lower than portland cement (for average grain diameter in 14-18 μ m, distribution of particles is shown in Fig. 1 (c)), it is seen that its mill efficiency is high,
Grinding energy is far below portland cement.
(2) mechanical strength
Compression strength (the water ash of 42.5 ordinary portland cement of PO, pure dehydration Behavior of Hardened Cement Paste micro mist and low fever's complex cement
Than 0.5, cement mortar rate 1:3) as shown in table 1.As can be seen from the table, either early strength or later strength, pure dehydration water
The flexural strength and compression strength of mudstone are lower, are only capable of using as low strong rubber gel material, significantly limit it and use model
It encloses.
Compared with pure dehydration Behavior of Hardened Cement Paste, low fever's complex cement 3d, 28d flexural strength prepared by the present invention is respectively increased
103.8% and 91.9%, 109.6% and 127.9% has been respectively increased in 3d, 28d compression strength, and mechanical property greatly improves.
Compared with 42.5 ordinary portland cement of PO, the early strength of low fever's complex cement improves larger, flexural strength
16.3% and 18.8% is respectively increased with compression strength, early strong effect is obvious.Mechanical strength and PO 42.5 when 28d is common
Portland cement is suitable.
1 mechanical property of table compares
Wherein 42.5 ordinary portland cement of PO used in the present embodiment is that Xuzhou China combines the production of building materials group.
Embodiment 2, it is substantially the same manner as Example 1, except that cement raw material composition and its mass percent: dehydration water
Mudstone powder 50%, dihydrate gypsum 5%, anhydrous sodium sulphate 3%, miberal powder 40%, red mud 2%.Calcination time is 30min, calcination temperature 800
℃
Embodiment 3, it is substantially the same manner as Example 1, except that cement raw material composition and its mass percent: dehydration water
Mudstone powder 70%, dihydrate gypsum 2%, anhydrous sodium sulphate 1.5%, miberal powder 25%, CHARACTERISTICS OF TAILINGS SAND or gangue or stone pit stone fragment 1.5%.It forges
The burning time is 1.5h, and calcination temperature is 600 DEG C.
Embodiment 4, it is substantially the same manner as Example 1, except that cement raw material composition and its mass percent: dehydration water
Mudstone powder 70%, dihydrate gypsum 3%, anhydrous sodium sulphate 2%, miberal powder 25%.
Claims (1)
1. a kind of method for mutually preparing low fever's complex cement using discarded concrete Behavior of Hardened Cement Paste, its step are as follows:
Step 1, it calcines: the at a temperature of low temperature by the hardened cement stone powder isolated in discarded concrete at 600 DEG C -800 DEG C
30min or more is calcined, dehydration Behavior of Hardened Cement Paste powder is made；
Step 2, preparation raw material (mass percent): dehydration Behavior of Hardened Cement Paste powder 50%-70%, dihydrate gypsum 2%-5%, anhydrous sodium sulphate
1.5%-3%, miberal powder 25%-40%, other mixing materials 0%-20%, each component mix in proportion；
Step 3, grinding: raw material grinding to the granularity that step 2 is prepared is crossed into 0.08mm square hole screen and is tailed over no more than 2%, specific surface area
Not less than 400m2/ kg is to get low fever's complex cement；
The low temperature calcination time is 30min~90min；
The miberal powder is to meet graining blast-furnace cinder micro-powder as defined in GB/T 18046-2008 standard, is granulated blast-furnace slag
Grinding reaches specific surface area >=300 m after iron removal by magnetic separation is handled2/ kg is made, wherein superfine granule of the partial size less than 30 μm
Change blast-furnace cinder micro-powder and accounts for 70% of gross mass or more；
Other described mixing materials are flyash, red mud, the powder in artificial sand, CHARACTERISTICS OF TAILINGS SAND, gangue or stone pit stone fragment, grain
Degree is tailed over by 0.15mm square hole screen no more than 5%.
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| CN107935421A (en) * | 2018-01-10 | 2018-04-20 | 贵州珉汇循环经济股份有限公司 | A kind of method that waste residue prepares portland cement |
| CN108467234B (en) * | 2018-04-03 | 2021-06-18 | 中国矿业大学 | Rock mass fracture grouting material prepared from cement stone phase and preparation method |
| CN109796153A (en) * | 2019-04-02 | 2019-05-24 | 山东建筑大学 | A kind of aged cement hydration activity exciting agent |
| CN112794683B (en) * | 2021-01-13 | 2022-06-21 | 南京工业大学 | Waste concrete-based regenerated cementing material and preparation method thereof |
| CN113979654B (en) * | 2021-10-21 | 2022-08-26 | 东南大学 | Gelling cyclic regeneration material of waste cement-based material and preparation method thereof |
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| KR100379697B1 (en) * | 2002-05-06 | 2003-04-08 | Sang Gyun Oh | Process for producing recycled cement |
| CN100391881C (en) * | 2006-06-01 | 2008-06-04 | 武汉理工大学 | Composite gelling material and its preparation method |
| CN102515584B (en) * | 2011-11-21 | 2013-07-17 | 武汉理工大学 | Regenerated concrete and manufacturing method thereof |
| CN102659328A (en) * | 2012-04-27 | 2012-09-12 | 武汉理工大学 | Preparation method of modified regenerated cementing material |
| CN104276772B (en) * | 2014-09-12 | 2016-08-17 | 河海大学 | A kind of preparation method of hydraulic cementing materials |
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| CN106904847A (en) | 2017-06-30 |
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