CN104446081B - Concrete expansion agent and preparation method thereof - Google Patents
Concrete expansion agent and preparation method thereof Download PDFInfo
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- CN104446081B CN104446081B CN201410699473.5A CN201410699473A CN104446081B CN 104446081 B CN104446081 B CN 104446081B CN 201410699473 A CN201410699473 A CN 201410699473A CN 104446081 B CN104446081 B CN 104446081B
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Abstract
The invention provides a concrete expansion agent which comprises the following raw materials in parts by weight: 30-55 parts of expansion clinker, 10-20 parts of gypsum, 5-15 parts of coal gangue and 30-60 parts of sulfur-fixed coal ashes, wherein the expansion clinker comprises calcium oxide expansion clinker, calcium sulphoaluminate expansion clinker or calcium oxide-calcium sulphoaluminate expansion clinker. The invention provides a preparation method of the concrete expansion agent. The method comprises the following steps: crushing the expansion clinker, the gypsum, the coal gangue and the sulfur-fixed coal ashes, then mixing and grinding, and thus obtaining the concrete expansion agent, wherein the mass ratio of the expansion clinker, the gypsum, the coal gangue and the sulfur-fixed coal ashes is (30-55): (10-20): (5-15): (30-60). The expansion clinker, the coal gangue and the sulfur-fixed coal ashes are used as donors of an expansion source, so that the expansion agent can have a good expansion performance so as to have good properties of crack-resistance and waterproofing.
Description
Technical field
The present invention relates to technical field of concrete, more particularly, to a kind of expansive agent for concrete and preparation method thereof.
Background technology
Generally, building has crack is inevitable, but the detrimental extent in crack can control.
Building produces what crack was mainly caused by the drying shrinkage of concrete and temperature deformation, therefore expansive concrete be solve mixed
Most effective, the most economical technological approaches of solidifying soil cracking.Expansive agent for concrete is the mainly additional of preparation expansive concrete
Agent, because extender has excellent compensation shrinkage, is widely used in self waterproofing, the overlength knot of underground concrete structure
The jointless construction of structure and control of concrete cracks.
The main component of extender includes calcium oxide, sulfur trioxide and aluminium sesquioxide, wherein calcium oxide and sulfur trioxide
Source more fixing, mainly there are silicate cement hydration or free calcium oxide in the source of such as calcium oxide, and sulfur trioxide is main
There is provided by Gypsum Fibrosum slow setting component in anhydrite Ⅲ or portland cement；And the source of aluminium sesquioxide is then varied
, such as calcium aluminate, calcium sulphoaluminate, slag containing aluminium ore, gangue, alunite, Kaolin, dickite and calcined alumina etc., generally adopt
With high alumina, Alumina, calcine dickite etc. as the raw material of aluminium sesquioxide, but these raw material resources are limited, price is held high
Expensive.
Found by research, extender can be prepared as the raw material of aluminium sesquioxide using fluidized bed combustion coal ash/slag.Fluidized bed combustion coal ash/slag is
When coal adopts Combustion technology of circulating fluidized to burn in fluidized bed combustion coal burning boiler, sulfur-bearing coal and sulphur-fixing agent are at 850 DEG C～900 DEG C
The solid waste producing after lower burning, contains the mineral such as sulfur trioxide and aluminium sesquioxide in fluidized bed combustion coal ash/slag, and in high temperature
Lower burning obtains, and has higher activity in terms of self-hardening property, Pozzolanic feature and dilatancy.Therefore using fluidized bed combustion coal ash/slag as raw material
Prepare extender and both can solve the nervous expensive problem of aluminium sesquioxide supply source resource, fluidized bed combustion coal ash/slag can also be solved and draw
The problem of environmental pollution rising, is a kind of good recycling approach.
The Chinese patent of Application No. cn201010264828.x discloses one kind and contains circulating fluidized bed combustion coal solid sulfur clinker
Cement expansive material, the composition of described cement expansive material and percent mass ratio are: 30%～50% fluidized bed combustion coal ash/slag；
40%～65% anhydrite；5%～30% lithium slag；The preparation method of this cement expansive material is by above-mentioned each component powder
After broken, powder-processed, cement expansive material can be prepared in after described ratio feeding, mix homogeneously.Prior art provides
Although this cement expansive material preparation during be not required to calcination process, preparation cost is relatively low, and also reduces ring
Border is polluted；But the expansion character of this cement expansive material is poor, thus leading to its anti-cracking waterproof poor-performing.
Content of the invention
In view of this, it is an object of the invention to provide a kind of expansive agent for concrete and preparation method thereof, the present invention carries
For expansive agent for concrete there is preferable anti-cracking waterproof performance.
The invention provides a kind of expansive agent for concrete, in parts by weight, composed of the following components:
30 parts～55 parts of expansive clinker, described expansive clinker includes calcium oxide expansive clinker, calcium sulphoaluminate expansive clinker
Or calcium oxide-calcium sulphoaluminate expansive clinker；
10 parts～20 parts of Gypsum Fibrosum；
5 parts～15 parts of gangue；
30 parts～60 parts of fluidized bed combustion coal ash/slag.
Preferably, described calcium oxide expansive clinker is in parts by weight, comprising:
6.5 parts～8.1 parts of silicon dioxide；
5.4 parts～6.8 parts of aluminium sesquioxide；
2.3 parts～3.7 parts of iron sesquioxide；
81.0 parts～82.6 parts of calcium oxide；
0.2 part～0.7 part of magnesium oxide；
0 part～0.5 part of sulfur trioxide.
Preferably, described calcium sulphoaluminate expansive clinker is in parts by weight, comprising:
8.5 parts～9.7 parts of silicon dioxide；
28.6 parts～30.5 parts of aluminium sesquioxide；
1.5 parts～3.1 parts of iron sesquioxide；
42.8 parts～44.0 parts of calcium oxide；
0.5 part～1.8 parts of magnesium oxide；
11.8 parts～13.2 parts of sulfur trioxide.
Preferably, described calcium oxide-calcium sulphoaluminate expansive clinker is in parts by weight, comprising:
6.5 parts～7.8 parts of silicon dioxide；
5.8 parts～7.0 parts of aluminium sesquioxide；
2.3 parts～3.8 parts of iron sesquioxide；
72.8 parts～74.1 parts of calcium oxide；
0.3 part～1.2 parts of magnesium oxide；
7.2 parts～8.5 parts of sulfur trioxide.
Preferably, the preparation method of described calcium oxide expansive clinker is:
Limestone, Alumina and iron powder are calcined, is obtained calcium oxide expansive clinker；The temperature of described calcining is 1300 DEG C
～1400 DEG C.
Preferably, the preparation method of described calcium sulphoaluminate expansive clinker is:
Limestone, Gypsum Fibrosum and Alumina are calcined, is obtained calcium sulphoaluminate expansive clinker；The temperature of described calcining is 1320
DEG C～1370 DEG C.
Preferably, the preparation method of described calcium oxide-calcium sulphoaluminate expansive clinker is:
Limestone, Gypsum Fibrosum, bauxite and iron powder are calcined, is obtained calcium oxide-calcium sulphoaluminate expansive clinker；Described forge
The temperature burnt is 1300 DEG C～1370 DEG C.
Preferably, described Gypsum Fibrosum includes fluorgypsum, ardealite, desulfurated plaster, dihydrate gypsum or anhydrite.
Preferably, described gangue is in parts by weight, comprising:
21 parts～25 parts of aluminium sesquioxide；
3.7 parts～6.2 parts of iron sesquioxide.
Preferably, described fluidized bed combustion coal ash/slag is in parts by weight, comprising:
24 parts～44 parts of silicon dioxide；
1 part～13.5 parts of sulfur trioxide；
2 parts～21.5 parts of calcium oxide；
11 parts～29 parts of aluminium sesquioxide；
3 parts～15 parts of iron sesquioxide；
0.5 part～1.1 parts of potassium oxide.
Preferably, the specific surface area of described expansive agent for concrete is 200m2/ kg～350m2/ kg, fineness are 13～25.
The invention provides a kind of preparation method of expansive agent for concrete, comprising:
Mix grinding after expansive clinker, Gypsum Fibrosum, gangue and fluidized bed combustion coal ash/slag are crushed respectively, obtains expansive agent for concrete；Institute
State expansive clinker and include calcium oxide expansive clinker, calcium sulphoaluminate expansive clinker or calcium oxide-calcium sulphoaluminate expansive clinker；
The mass ratio of described expansive clinker, Gypsum Fibrosum, gangue and fluidized bed combustion coal ash/slag is (30～55): (10～20): (5～
15): (30～60).
The invention provides a kind of expansive agent for concrete, in parts by weight, composed of the following components: 30 parts～55 parts
Expansive clinker, described expansive clinker includes calcium oxide expansive clinker, calcium sulphoaluminate expansive clinker or calcium oxide-calcium sulphoaluminate and expands
Grog；10 parts～20 parts of Gypsum Fibrosum；5 parts～15 parts of gangue；30 parts～60 parts of fluidized bed combustion coal ash/slag.In the present invention, described
Expansive clinker, gangue and fluidized bed combustion coal ash/slag, as the donor of expansion sources, after water met by free calcium oxide in expansive clinker, generate first
Individual expansion sources calcium hydroxide crystalline solid；Gypsum Fibrosum (caso4) with expansive clinker, gangue and fluidized bed combustion coal ash/slag in activated aluminum and water
After calcium hydroxide reaction after muddy water, generate second expansion sources entringite (c3a·3caso4·32h2o)；Due to solid sulfur ash
In slag, than dihydrate gypsum and natural anhydrite more slowly, dissolubility is also higher than dihydrate gypsum to the hydration rate of anhydrous gypsum, because
And also can generate dihydrate gypsum in use as the 3rd expansion sources；Above three expansion sources play expansion when
Between different, the contraction that concrete different larval instar is produced can synchronize coordination and compensate, so that the extender that the present invention provides
There is preferable expansion character, and then have preferable anti-cracking waterproof performance.
Test result indicate that, the expansive agent for concrete that the present invention is provided mixes and prepares compensation contraction in concrete
Concrete, described expansive concrete limited expansion rate of 3 days in water is 2.2%～2.7%, and in water, the restriction of 7 days is swollen
Swollen rate is 3.2%～3.7%, and in water, the limited expansion rate of 14 days is 3.4%～3.8%, and the limited expansion rate of dry empty 21 days is
1.3%～1.7%；The comprcssive strength of 28 days is 37.8mp～40mpa, and seepage-resistant grade is p12 level；Described compensation is shunk coagulation
Soil carries out flat tests, and testing the initial cracking time obtaining is 12.5 hours～13.5 hours, and crack Breadth Maximum is
0.09mm, crack greatest length is 5.9cm, crack total number up to 3, and flaw area is 9.7mm to the maximum2, flaw area
Slip ＞ 99%.The expansive agent for concrete that the present invention is provided carries out glue sand detection, and testing result is, 7 days in water
Glue sand limited expansion rate is 8%～9%, and the glue sand limited expansion rate done aerial 21 days is 4.3%～4.7%；Glue sand resistance to compression in 7 days
Intensity is 30mpa～32mpa, and 28 days glue sand comprcssive strength is 48mpa～50mpa.
Additionally, the expansive agent for concrete that the present invention provides is mainly former with trade waste fluidized bed combustion coal ash/slag and gangue
Material, not only solves the problem of environmental pollution that fluidized bed combustion coal ash/slag causes, and also makes the cost of the expansive agent for concrete of present invention offer
Relatively low；In addition, the present invention provides the consumption of Gypsum Fibrosum in expansive agent for concrete less, reduce further the mixed of present invention offer
The cost of solidifying soil extender.
The invention provides a kind of preparation method of expansive agent for concrete, comprising: by expansive clinker, Gypsum Fibrosum, gangue
Mix grinding after crushing respectively with fluidized bed combustion coal ash/slag, obtains expansive agent for concrete；Described expansive clinker includes calcium oxide expansive clinker, sulfur
Calcium aluminate expansive clinker or calcium oxide-calcium sulphoaluminate expansive clinker；Described expansive clinker, Gypsum Fibrosum, gangue and fluidized bed combustion coal ash/slag
Mass ratio is (30～55): (10～20): (5～15): (30～60).The concrete that the method that the present invention provides prepares is used
The expansion character of extender preferably, and then makes this expansive agent for concrete have preferable anti-cracking waterproof performance.Additionally, this
Bright offer prepare expansive agent for concrete method cost is relatively low, safety and environmental protection, process is simple.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this
Inventive embodiment, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing providing obtains other accompanying drawings.
The glue sand of the expansive agent for concrete that Fig. 1 is the embodiment of the present invention 1, comparative example 1 and comparative example 2 provide limits and expands
Curve.
Specific embodiment
Below the embodiment it is clear that described is clearly and completely described to the technical scheme in the embodiment of the present invention
It is only a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the common skill in this area
The every other embodiment that art personnel are obtained under the premise of not making creative work, broadly falls into the model of present invention protection
Enclose.
The invention provides a kind of expansive agent for concrete, in parts by weight, composed of the following components:
30 parts～55 parts of expansive clinker, described expansive clinker includes calcium oxide expansive clinker, calcium sulphoaluminate expansive clinker
Or calcium oxide-calcium sulphoaluminate expansive clinker；
10 parts～20 parts of Gypsum Fibrosum；
5 parts～15 parts of gangue；
30 parts～60 parts of fluidized bed combustion coal ash/slag.
In the present invention, described expansive clinker, gangue and fluidized bed combustion coal ash/slag, as the donor of expansion sources, make the present invention provide
Extender there is preferable expansion character, and then have preferable anti-cracking waterproof performance.Additionally, the concrete that the present invention provides is used
Extender, with trade waste fluidized bed combustion coal ash/slag and gangue as primary raw material, not only solves the environmental pollution that fluidized bed combustion coal ash/slag causes
Problem, also makes the cost of the expansive agent for concrete of present invention offer relatively low；In addition, the present invention is provided in expansive agent for concrete
The consumption of Gypsum Fibrosum is less, reduce further the cost of the expansive agent for concrete of present invention offer.
The expansive agent for concrete that the present invention provides includes 30 parts～55 parts of expansive clinker in parts by weight, and preferably 35
Part～50 parts, more preferably 40 parts～45 parts.In the present invention, described expansive clinker includes calcium oxide expansive clinker, sulfur aluminic acid
Calcium expansive clinker or calcium oxide-calcium sulphoaluminate expansive clinker, preferably calcium oxide-calcium sulphoaluminate expansive clinker.In the present invention,
Described calcium oxide expansive clinker in parts by weight, preferably includes 6.5 parts～8.1 parts of silicon dioxide；The three of 5.4 parts～6.8 parts
Al 2 O；2.3 parts～3.7 parts of iron sesquioxide；81.0 parts～82.6 parts of calcium oxide；0.2 part～0.7 part of oxidation
Magnesium；0 part～0.5 part of sulfur trioxide.
In the present invention, described calcium sulphoaluminate expansive clinker in parts by weight, preferably includes 8.5 parts～9.7 parts of dioxy
SiClx；28.6 parts～30.5 parts of aluminium sesquioxide；1.5 parts～3.1 parts of iron sesquioxide；42.8 parts～44.0 parts of oxidation
Calcium；0.5 part～1.8 parts of magnesium oxide；11.8 parts～13.2 parts of sulfur trioxide.
In the present invention, described calcium oxide-calcium sulphoaluminate expansive clinker in parts by weight, preferably includes 6.5 parts～7.8 parts
Silicon dioxide；5.8 parts～7.0 parts of aluminium sesquioxide；2.3 parts～3.8 parts of iron sesquioxide；72.8 parts～74.1 parts
Calcium oxide；0.3 part～1.2 parts of magnesium oxide；7.2 parts～8.5 parts of sulfur trioxide.
The present invention does not have special restriction to the source of described expansive clinker, can be bought by market and obtain, can be prepared into yet
Arrive.In the present invention, the preparation method of described calcium oxide expansive clinker is preferably:
Limestone, Alumina and iron powder are calcined, is obtained calcium oxide expansive clinker；The temperature of described calcining is 1300 DEG C
～1400 DEG C.
In the present invention, the temperature calcined during preparing described calcium oxide expansive clinker more preferably 1320 DEG C～1380
DEG C, most preferably 1340 DEG C～1360 DEG C.In the present invention, the mass ratio of described limestone, Alumina and iron powder be preferably (85～
95): (4～8): (3～6), more preferably (88～92): (6～7): (4～5).The present invention is to described limestone, Alumina and ferrum
The source of powder does not have special restriction, can be bought by market and obtain.
In the present invention, the preparation method of described calcium sulphoaluminate expansive clinker is preferably:
Limestone, Gypsum Fibrosum and Alumina are calcined, is obtained calcium sulphoaluminate expansive clinker；The temperature of described calcining is 1320
DEG C～1370 DEG C.
In the present invention, more preferably 1340 DEG C of the temperature calcined during preparing described calcium sulphoaluminate expansive clinker～
1360℃.In the present invention, the mass ratio of described limestone, Gypsum Fibrosum and Alumina is preferably (40～50): (15～25): (35～
45), more preferably (42～48): (18～22): (38～42).The present invention does not have to the source of described limestone, Gypsum Fibrosum and Alumina
There is special restriction, can be bought by market and obtain.
In the present invention, the preparation method of described calcium oxide-calcium sulphoaluminate expansive clinker is preferably:
Limestone, Gypsum Fibrosum, bauxite and iron powder are calcined, is obtained calcium oxide-calcium sulphoaluminate expansive clinker；Described forge
The temperature burnt is 1300 DEG C～1370 DEG C.
In the present invention, the temperature calcined during preparing described calcium oxide-calcium sulphoaluminate expansive clinker is more preferably
1320 DEG C～1350 DEG C.In the present invention, the mass ratio of described limestone, Gypsum Fibrosum, bauxite and iron powder be preferably (75～
85): (8～18): (4～8): a, 0 ＜ a≤4, more preferably (78～82): (10～16): (5～7): (1～3)；Most preferably
80:14:6:2.The present invention does not have special restriction to the source of described limestone, Gypsum Fibrosum, bauxite and iron powder, can be purchased by market
Buy acquisition.
In the present invention, on the basis of the parts by weight of described expansive clinker, the expansive agent for concrete that the present invention provides
Including 10 parts～20 parts of Gypsum Fibrosum, preferably 12 parts～18 parts, more preferably 14 parts～16 parts.In the present invention, described Gypsum Fibrosum
Preferably include fluorgypsum, ardealite, desulfurated plaster, dihydrate gypsum or anhydrite, more preferably fluorgypsum, ardealite or admant
Cream, most preferably anhydrite.In the present invention, described anhydrite can be both natural anhydrite or synthesis anhydrite.
In the present invention, in parts by weight, described anhydrite preferably includes:
38 parts～44 parts of calcium oxide；
56 parts～60 parts of sulfur trioxide.
In the present invention, in parts by weight, described anhydrite preferably includes 38 parts～44 parts of calcium oxide, and more preferably 40
Part～42 parts.In the present invention, on the basis of the parts by weight of described calcium oxide, described anhydrite preferably includes 56 parts～60 parts
Sulfur trioxide, more preferably 57 parts～58 parts.
The present invention does not have special restriction to the source of described Gypsum Fibrosum, can be bought by market and obtain.
In the present invention, on the basis of the parts by weight of described expansive clinker, the expansive agent for concrete that the present invention provides
Including 5 parts～15 parts of gangue, preferably 6 parts～14 parts, more preferably 7 parts～12 parts.The present invention is to described gangue
Form does not have special restriction, and described gangue can be block, granular or powder, preferably bulk
's.In the present invention, in parts by weight, described gangue preferably includes:
21 parts～25 parts of aluminium sesquioxide；
3.7 parts～6.2 parts of iron sesquioxide.
In the present invention, in parts by weight, described gangue preferably includes 21 parts～25 parts of aluminium sesquioxide, more preferably
For 22 parts～24 parts.In the present invention, on the basis of the parts by weight of described aluminium sesquioxide, described gangue preferably includes
3.7 parts～6.2 parts of iron sesquioxide, more preferably 4.3 parts～5 parts.
The present invention does not have special restriction to the source of described gangue, using above-mentioned kind well known to those skilled in the art
The gangue of class, can be bought by market and obtain.
In the present invention, on the basis of the parts by weight of described expansive clinker, the expansive agent for concrete that the present invention provides
Including 30 parts～60 parts of fluidized bed combustion coal ash/slag, preferably 35 parts～55 parts, more preferably 40 parts～50 parts.The present invention is to described solid sulfur
The species of lime-ash does not have special restriction, and described fluidized bed combustion coal ash/slag can be solid sulfur ash and/or CFB residues.In the present invention, with weight
Amount part meter, described fluidized bed combustion coal ash/slag preferably includes:
24 parts～44 parts of silicon dioxide；
1 part～13.5 parts of sulfur trioxide；
2 parts～21.5 parts of calcium oxide；
11 parts～29 parts of aluminium sesquioxide；
3 parts～15 parts of iron sesquioxide；
0.5 part～1.1 parts of potassium oxide.
In the present invention, described fluidized bed combustion coal ash/slag preferably includes 24 parts～44 parts of silicon dioxide, and more preferably 30 parts～40
Part.In the present invention, on the basis of the parts by weight of described silicon dioxide, described fluidized bed combustion coal ash/slag preferably includes 1 part～13.5 parts
Sulfur trioxide, more preferably 3 parts～10 parts, most preferably 4 parts～8 parts.In the present invention, with the weight of described silicon dioxide
On the basis of number, described fluidized bed combustion coal ash/slag preferably includes 2 parts～21.5 parts of calcium oxide, more preferably 5 parts～15 parts, most preferably
8 parts～12 parts.In the present invention, on the basis of the parts by weight of described silicon dioxide, described fluidized bed combustion coal ash/slag preferably includes 11 parts
～29 parts of aluminium sesquioxide, more preferably 15 parts～25 parts, most preferably 18 parts～22 parts.In the present invention, with described two
On the basis of the parts by weight of silicon oxide, described fluidized bed combustion coal ash/slag preferably includes 3 parts～15 parts of iron sesquioxide, more preferably 5 parts
～10 parts.In the present invention, on the basis of the parts by weight of described silicon dioxide, described fluidized bed combustion coal ash/slag preferably include 0.5 part～
1.1 parts of potassium oxide, more preferably 0.8 part～1 part.
The present invention does not have special restriction to the source of described fluidized bed combustion coal ash/slag, using well known to those skilled in the art above-mentioned
The fluidized bed combustion coal ash/slag of species, can collect the waste residue after circulating fluid-bed burning.
The specific surface area of the expansive agent for concrete that the present invention provides is preferably 200m2/ kg～350m2/ kg, more preferably
250m2/ kg～300m2/kg.In the present invention, the fineness of described expansive agent for concrete is preferably 13～25, more preferably 15
～20.In the present invention, described fineness refers to tailing over of the square hole screen by 0.08mm.
The invention provides a kind of preparation method of expansive agent for concrete, comprising:
Mix grinding after expansive clinker, Gypsum Fibrosum, gangue and fluidized bed combustion coal ash/slag are crushed respectively, obtains expansive agent for concrete；Institute
State expansive clinker and include calcium oxide expansive clinker, calcium sulphoaluminate expansive clinker or calcium oxide-calcium sulphoaluminate expansive clinker；
The mass ratio of described expansive clinker, Gypsum Fibrosum, gangue and fluidized bed combustion coal ash/slag is (30～55): (10～20): (5～
15): (30～60).
The expansion character of the expansive agent for concrete that the method that the present invention provides prepares preferably, and then makes this coagulation
Soil extender has preferable anti-cracking waterproof performance.Additionally, the method preparing expansive agent for concrete that the present invention provides becomes
This relatively low, safety and environmental protection, process is simple.
Expansive clinker, Gypsum Fibrosum, gangue and fluidized bed combustion coal ash/slag are crushed rear mix grinding by the present invention respectively, obtain concrete and expand
Agent.The present invention prepares expansive agent for concrete by the way of this mix grinding, and this method energy consumption is relatively low, save energy.This
Bright do not have special restriction to described broken and mix grinding method, using well known to those skilled in the art broken and mix grinding skill
Art scheme, the specific surface area making the expansive agent for concrete finally giving is 200m2/ kg～350m2/ kg, fineness for 13～25 are
Can.
In the present invention, the species of described expansive clinker, Gypsum Fibrosum, gangue and fluidized bed combustion coal ash/slag, source and parts by weight with
Described in technique scheme, the species of expansive clinker, Gypsum Fibrosum, gangue and fluidized bed combustion coal ash/slag, source are consistent with parts by weight, here
Repeat no more.
The expansive agent for concrete that the present invention provides can be used for preparing expansive concrete, the coagulation that the present invention is provided
Soil replaces part of cement with extender, and the preparation method according to concrete can prepare expansive concrete.The present invention
During preparing expansive concrete, the mass ratio of described expansive agent for concrete and cement is preferably (6～12): (88
～94).
According to the method described in technique scheme, compensation is prepared using the expansive agent for concrete that the present invention provides
Shrinkage concrete, according to gb23439-2009 " cement expansive material " standard, the restriction testing described expansive concrete is swollen
Swollen rate, test result is that the expansive concrete being prepared using the expansive agent for concrete that the present invention provides is 3 in water
It limited expansion rate is 2.2%～2.7%, and in water, the limited expansion rate of 7 days is 3.2%～3.7%, the restriction of 14 days in water
Expansion rate is 3.4%～3.8%, and the limited expansion rate done empty 21 days is 1.3%～1.7%.
According to jgj/t 178-2009 " expansive concrete application technology code " standard, test above-mentioned compensation contraction mixed
The comprcssive strength of 28 days of solidifying soil, test result is, the compensation being prepared using the expansive agent for concrete that the present invention provides
The shrinkage concrete comprcssive strength of 28 days is 37.8mp～40mpa.
According to gb50164-2011 " Standard for quality control of concrete ", test the impervious etc. of above-mentioned expansive concrete
Level, test result is, the expansive concrete being prepared using the expansive agent for concrete that the present invention provides impervious etc.
Level is p12 level.
By the following method described expansive concrete is carried out with concrete flat slab split test:
Above-mentioned expansive concrete is poured into and in mould, plugs and pounds molding, smooth out surface, mould is placed in wind lamp photograph
In environment, the cracking situation of concrete slab in mould is tracked observe with fracture width detector.Start to see every 5min
Examine once, when finding that having crackle to be changed into every 10min when producing observes once, under conditions of wind lamp shines, to above-mentioned concrete
Plate carries out 24h observation.
In test, the frame using mould is the corrosion resistant plate of thick 5mm, and inner edge is the steel of 600mm × 600mm × 50mm
Mould, setting a diameter of 8mm, length in frame is the double screw of 50mm as 100mm, spacing, interlocks up and down spaced apart.
During on-test, one layer of oil is first smeared on die bottom plate, prevent above-mentioned concrete slab moisture from bottom surface evaporation loss.
Place a desk fan in the side away from mould minor face 15cm, desk fan fan blade center is parallel with described concrete slab surface, and wind speed is
4.0m/s～5.0m/s；It is located at the top 1.2m of the cross central line of described concrete slab using the iodine-tungsten lamp of 1000w, away from mould
At long side 15cm, continuous baking is closed according to 4h.
During test, ambient temperature control 20 DEG C ± 3 DEG C, relative humidity be 60 ± 5%.After off-test, record is described
The initial cracking time in crack on concrete slab, that is, start time crackle；Flaw size, including maximum crack width during 24h
Degree and the longest fracture length；Described fracture length cotton along crack move towards obtain corresponding length, fracture length with
Visually visible be defined, its value l is measured with ribbon, in terms of mm；The width d in described crack is measured with fracture width detector, splits
Fracture width near seam mid-length represents the maximum crack width in this crack.The calculating crack gross area according to the following equation:
Acr=σ aimax*li
Acr in formula -- the gross area (mm in crack on concrete slab2)；
Aimax -- the i-th crack maximum crack width (mm)；
The longest fracture length (mm) of li -- the i-th crack.
Test result is that the initial cracking time of described concrete slab is 12.5 hours～13.5 hours, and crack Breadth Maximum is
0.09mm, crack greatest length is 5.9cm, crack total number up to 3, and flaw area is 9.7mm to the maximum2, flaw area
Slip ＞ 99%.
According to the standard of gb23439-2009 " cement expansive material ", the expansive agent for concrete that the present invention is provided is carried out
Glue sand detects, testing result is that the expansive agent for concrete that the present invention provides glue sand limited expansion rate of 7 days in water is 8%
～9%, the glue sand limited expansion rate done aerial 21 days is 4.3%～4.7%；7 days glue sand comprcssive strength is 30mpa～32mpa,
The glue sand comprcssive strength of 28 days is 48mpa～50mpa.
The invention provides a kind of expansive agent for concrete, in parts by weight, 30 parts composed of the following components～55 parts
Expansive clinker, described expansive clinker includes calcium oxide expansive clinker, calcium sulphoaluminate expansive clinker or calcium oxide-calcium sulphoaluminate and expands
Grog；10 parts～20 parts of Gypsum Fibrosum；5 parts～15 parts of gangue；30 parts～60 parts of fluidized bed combustion coal ash/slag.In the present invention, described
Expansive clinker, gangue and fluidized bed combustion coal ash/slag, as the donor of expansion sources, make the extender that the present invention provides have preferable expansion
Performance, and then have preferable anti-cracking waterproof performance.Additionally, the expansive agent for concrete that the present invention provides is with the solid sulfur of trade waste
Lime-ash and gangue are primary raw material, not only solve the problem of environmental pollution that fluidized bed combustion coal ash/slag causes, and so that the present invention is provided
The cost of expansive agent for concrete is relatively low；In addition, the present invention provides the consumption of Gypsum Fibrosum in expansive agent for concrete less, further
The cost of the expansive agent for concrete of present invention offer is provided.
The invention provides a kind of preparation method of expansive agent for concrete, comprising: by expansive clinker, Gypsum Fibrosum, gangue
Mix grinding after crushing respectively with fluidized bed combustion coal ash/slag, obtains expansive agent for concrete；Described expansive clinker includes calcium oxide expansive clinker, sulfur
Calcium aluminate expansive clinker or calcium oxide-calcium sulphoaluminate expansive clinker；Described expansive clinker, Gypsum Fibrosum, gangue and fluidized bed combustion coal ash/slag
Mass ratio is (30～55): (10～20): (5～15): (30～60).The concrete that the method that the present invention provides prepares is used
The expansion character of extender preferably, and then makes this expansive agent for concrete have preferable anti-cracking waterproof performance.Additionally, this
Bright offer prepare expansive agent for concrete method cost is relatively low, safety and environmental protection, process is simple.
In following examples of the present invention adopt calcium oxide-calcium sulphoaluminate expansive clinker include 7.0% silicon dioxide,
6.5% aluminium sesquioxide, 3.1% iron sesquioxide, 73.6% calcium oxide, 0.8% magnesium oxide, 8.0% three oxygen
Change sulfur；Calcium sulphoaluminate expansive clinker include 9.3% silicon dioxide, 29.4% aluminium sesquioxide, 2.4% three oxidation two
Ferrum, 43.5% calcium oxide, 1.1% magnesium oxide, 12.6% sulfur trioxide；Calcium oxide expansive clinker includes the two of 7.3%
Silicon oxide, 6.1% aluminium sesquioxide, 2.5% iron sesquioxide, 82.1% calcium oxide, 0.5% magnesium oxide；Admant
Cream includes 39.1% calcium oxide, 52.6% sulfur trioxide；Gangue includes 24.1% aluminium sesquioxide, the three of 4.9%
Aoxidize two ferrum；Fluidized bed combustion coal ash/slag include 40.1% silicon dioxide, 8.6% sulfur trioxide, 18.6% calcium oxide, 23.4%
Aluminium sesquioxide, 8.5% iron sesquioxide, 0.8% potassium oxide.
Embodiment 1
By the calcium oxide of 40kg-calcium sulphoaluminate expansive clinker, the anhydrite of 16kg, the gangue of 10.4kg and 33.3kg
Fluidized bed combustion coal ash/slag crushes rear mix grinding respectively, obtains the expansive agent for concrete that fineness is 22.
Test the specific surface of the expansive agent for concrete that the embodiment of the present invention 1 obtains using Blain specific surface Permeability gauge
Long-pending, test result is that the specific surface area of the expansive agent for concrete that the embodiment of the present invention 1 prepares is 284m2/kg.
Expansive agent for concrete that the embodiment of the present invention 1 of 35kg is prepared, the cement of 325kg, the stone of 1098kg
The water of son, the sand of 732kg and 160kg and the mixing of 4.32kg polycarboxylate water-reducer, are compensated shrinkage concrete.
According to the method described in technique scheme, test the expansive concrete that the embodiment of the present invention 1 prepares
Limited expansion rate, 28 days comprcssive strength and seepage-resistant grade.As shown in table 1, table 1 is the embodiment of the present invention and compares test result
Expansive concrete limited expansion rate, comprcssive strength and seepage-resistant grade test result that example provides.
According to the method described in technique scheme, the expansive concrete that the embodiment of the present invention 1 is prepared enters
The cracking experiment of row concrete flat slab, test result as shown in table 2, receive for the compensation of the embodiment of the present invention and comparative example offer by table 2
Contracting concrete flat slab cracking experimental results.
According to the method described in technique scheme, the expansive agent for concrete that the embodiment of the present invention 1 is prepared enters
Row glue sand detects, tests its glue sand limited expansion rate and glue sand comprcssive strength, and as shown in Fig. 1 and Biao 3, Fig. 1 is this to test result
The glue sand of the expansive agent for concrete that inventive embodiments 1, comparative example 1 and comparative example 2 provide limits expansion curve, wherein curve 1
The glue sand of the expansive agent for concrete providing for the embodiment of the present invention 1 limits expansion curve；Table 3 is the embodiment of the present invention and compares
The expansive agent for concrete glue sand detection test result that example provides.
Embodiment 2
Solid sulfur by the calcium sulphoaluminate expansive clinker of 42.8kg, the anhydrite of 18.6kg, the gangue of 5.4kg and 33.2kg
Lime-ash crushes rear mix grinding respectively, obtains the expansive agent for concrete that fineness is 20.
Test the specific surface of the expansive agent for concrete that the embodiment of the present invention 2 obtains using Blain specific surface Permeability gauge
Long-pending, test result is that the specific surface area of the expansive agent for concrete that the embodiment of the present invention 2 prepares is 302m2/kg.
Expansive agent for concrete that the embodiment of the present invention 2 of 35kg is prepared, the cement of 325kg, the stone of 1098kg
The water of son, the sand of 732kg and 160kg and the mixing of 4.32kg polycarboxylate water-reducer, are compensated shrinkage concrete.
According to the method described in technique scheme, test the expansive concrete that the embodiment of the present invention 2 prepares
Limited expansion rate, 28 days comprcssive strength and seepage-resistant grade.Test result is as shown in table 1.
According to the method described in technique scheme, the expansive concrete that the embodiment of the present invention 2 is prepared enters
The cracking experiment of row concrete flat slab, test result is as shown in table 2.
According to the method described in technique scheme, the expansive agent for concrete that the embodiment of the present invention 2 is prepared enters
Row glue sand detects, tests its glue sand limited expansion rate and glue sand comprcssive strength, test result is as shown in table 3.
Embodiment 3
Fluidized bed combustion coal ash/slag by the calcium oxide expansive clinker of 42kg, the anhydrite of 12.7kg, the gangue of 8.4kg and 36.9kg
Mix grinding after crushing respectively, obtains the expansive agent for concrete that fineness is 20.
Test the specific surface of the expansive agent for concrete that the embodiment of the present invention 3 obtains using Blain specific surface Permeability gauge
Long-pending, test result is that the specific surface area of the expansive agent for concrete that the embodiment of the present invention 3 prepares is 343m2/kg.
Expansive agent for concrete that the embodiment of the present invention 3 of 35kg is prepared, the cement of 325kg, the stone of 1098kg
The water of son, the sand of 732kg and 160kg and the mixing of 4.32kg polycarboxylate water-reducer, are compensated shrinkage concrete.
According to the method described in technique scheme, test the expansive concrete that the embodiment of the present invention 3 prepares
Limited expansion rate, 28 days comprcssive strength and seepage-resistant grade.Test result is as shown in table 1.
According to the method described in technique scheme, the expansive concrete that the embodiment of the present invention 3 is prepared enters
The cracking experiment of row concrete flat slab, test result is as shown in table 2.
According to the method described in technique scheme, the expansive agent for concrete that the embodiment of the present invention 3 is prepared enters
Row glue sand detects, tests its glue sand limited expansion rate and glue sand comprcssive strength, test result is as shown in table 3.
Comparative example 1
By the cement of 360kg, the water of the stone of 1098kg, the sand of 732kg and 160kg and 4.32kg polycarboxylate water-reducer
Mixing, obtains concrete.
According to the method described in technique scheme, the restriction testing the concrete that comparative example 1 of the present invention prepares is swollen
Swollen rate, 28 days comprcssive strength and seepage-resistant grade.Test result is as shown in table 1.
According to the method described in technique scheme, the concrete that comparative example 1 of the present invention is prepared carries out concrete
Flat board cracking experiment, test result is as shown in table 2.
According to the method described in technique scheme, the concrete that comparative example 1 of the present invention is prepared carries out glue sand inspection
Survey, test its glue sand limited expansion rate and glue sand comprcssive strength, as shown in Fig. 1 and Biao 3, in Fig. 1, curve 3 is this to test result
The glue sand of the concrete that bright comparative example 1 provides limits expansion curve.
Comparative example 2
Commercially available uea type extender.
Expansive agent for concrete that the comparative example of the present invention 2 of 35kg is provided, the cement of 325kg, the stone of 1098kg,
The water of the sand of 732kg and 160kg and the mixing of 4.32kg polycarboxylate water-reducer, are compensated shrinkage concrete.
According to the method described in technique scheme, test the expansive concrete that comparative example 2 of the present invention prepares
Limited expansion rate, 28 days comprcssive strength and seepage-resistant grade.Test result is as shown in table 1.
According to the method described in technique scheme, the expansive concrete that comparative example 2 of the present invention is prepared enters
The cracking experiment of row concrete flat slab, test result is as shown in table 2.
According to the method described in technique scheme, the expansive agent for concrete that comparative example 2 of the present invention is provided carries out glue
Sand detects, tests its glue sand limited expansion rate and glue sand comprcssive strength, as shown in Fig. 1 and Biao 3, in Fig. 1, curve 2 is test result
The glue sand of the expansive agent for concrete that comparative example 2 of the present invention provides limits expansion curve.
The expansive concrete limited expansion rate of table 1 embodiment of the present invention and comparative example offer, resistance to compression
Intensity and seepage-resistant grade test result
As shown in Table 1, coagulation is shunk using the compensation that expansive agent for concrete provided in an embodiment of the present invention prepares
Soil, substantially, seepage-resistant grade significantly improves its expansion effect, and comprcssive strength also improves, and effectively compensate for concrete hard
Contraction during change, greatly reduces the generation in crack, improves the compactness of concrete, serves anti-cracking waterproof effect.
The expansive concrete flat board cracking experiment test of table 2 embodiment of the present invention and comparative example offer
Result
As shown in Table 2, expansive agent for concrete provided in an embodiment of the present invention, can reduce in course of hardening
Internal temperature rise, shrinks deformation with swelling stress compensating concrete, fill concrete internal voids, thus effectively improve concrete dense
Reality, impermeability, thus reach the effect of anti-cracking waterproof.
The expansive agent for concrete glue sand detection test result of table 3 embodiment of the present invention and comparative example offer
As shown in Table 3, the glue sand limited expansion rate of expansive agent for concrete provided in an embodiment of the present invention is all high with intensity
In the requirement of gb23439-2009 " cement expansive material ", and it is better than commercially available extender.It will be seen from figure 1 that the present invention is real
The expansion-loss applying the extender of example offer in the plastic stage is less, and the commercially available extender of effective expansion ratio is much higher.
As seen from the above embodiment, the invention provides a kind of expansive agent for concrete, in parts by weight, by following components
The expansive clinker of 30 parts～55 parts of composition, described expansive clinker includes calcium oxide expansive clinker, calcium sulphoaluminate expansive clinker or oxygen
Change calcium-calcium sulphoaluminate expansive clinker；10 parts～20 parts of Gypsum Fibrosum；5 parts～15 parts of gangue；30 parts～60 parts of solid sulfur ash
Slag.In the present invention, described expansive clinker, gangue and fluidized bed combustion coal ash/slag, as the donor of expansion sources, make the swollen of present invention offer
Swollen dose has preferable expansion character, and then has preferable anti-cracking waterproof performance.Additionally, the concrete that the present invention provides expands
Agent, with trade waste fluidized bed combustion coal ash/slag and gangue as primary raw material, not only solves the environmental pollution that fluidized bed combustion coal ash/slag causes and asks
Topic, also makes the cost of the expansive agent for concrete of present invention offer relatively low；In addition, the present invention provides stone in expansive agent for concrete
The consumption of cream is less, reduce further the cost of the expansive agent for concrete of present invention offer.
The invention provides a kind of preparation method of expansive agent for concrete, comprising: by expansive clinker, Gypsum Fibrosum, gangue
Mix grinding after crushing respectively with fluidized bed combustion coal ash/slag, obtains expansive agent for concrete；Described expansive clinker includes calcium oxide expansive clinker, sulfur
Calcium aluminate expansive clinker or calcium oxide-calcium sulphoaluminate expansive clinker；Described expansive clinker, Gypsum Fibrosum, gangue and fluidized bed combustion coal ash/slag
Mass ratio is (30～55): (10～20): (5～15): (30～60).The concrete that the method that the present invention provides prepares is used
The expansion character of extender preferably, and then makes this expansive agent for concrete have preferable anti-cracking waterproof performance.Additionally, this
Bright offer prepare expansive agent for concrete method cost is relatively low, safety and environmental protection, process is simple.
Claims (10)
1. a kind of expansive agent for concrete, in parts by weight, composed of the following components:
30 parts～55 parts of expansive clinker, described expansive clinker includes calcium oxide expansive clinker, calcium sulphoaluminate expansive clinker or oxygen
Change calcium-calcium sulphoaluminate expansive clinker；
10 parts～20 parts of Gypsum Fibrosum；
5 parts～15 parts of gangue；
30 parts～60 parts of fluidized bed combustion coal ash/slag.
2. expansive agent for concrete according to claim 1 is it is characterised in that described calcium oxide expansive clinker is with weight portion
Meter, comprising:
6.5 parts～8.1 parts of silicon dioxide；
5.4 parts～6.8 parts of aluminium sesquioxide；
2.3 parts～3.7 parts of iron sesquioxide；
81.0 parts～82.6 parts of calcium oxide；
0.2 part～0.7 part of magnesium oxide；
0 part～0.5 part of sulfur trioxide.
3. expansive agent for concrete according to claim 1 is it is characterised in that described calcium sulphoaluminate expansive clinker is with weight
Part meter, comprising:
8.5 parts～9.7 parts of silicon dioxide；
28.6 parts～30.5 parts of aluminium sesquioxide；
1.5 parts～3.1 parts of iron sesquioxide；
42.8 parts～44.0 parts of calcium oxide；
0.5 part～1.8 parts of magnesium oxide；
11.8 parts～13.2 parts of sulfur trioxide.
4. expansive agent for concrete according to claim 1 is it is characterised in that described calcium oxide-calcium sulphoaluminate expansion is ripe
Material is in parts by weight, comprising:
6.5 parts～7.8 parts of silicon dioxide；
5.8 parts～7.0 parts of aluminium sesquioxide；
2.3 parts～3.8 parts of iron sesquioxide；
72.8 parts～74.1 parts of calcium oxide；
0.3 part～1.2 parts of magnesium oxide；
7.2 parts～8.5 parts of sulfur trioxide.
5. expansive agent for concrete according to claim 1 and 2 is it is characterised in that the system of described calcium oxide expansive clinker
Preparation Method is:
Limestone, Alumina and iron powder are calcined, is obtained calcium oxide expansive clinker；The temperature of described calcining be 1300 DEG C～
1400℃.
6. the expansive agent for concrete according to claim 1 or 3 is it is characterised in that described calcium sulphoaluminate expansive clinker
Preparation method is:
Limestone, Gypsum Fibrosum and Alumina are calcined, is obtained calcium sulphoaluminate expansive clinker；The temperature of described calcining be 1320 DEG C～
1370℃.
7. the expansive agent for concrete according to claim 1 or 4 is it is characterised in that described calcium oxide-calcium sulphoaluminate expands
The preparation method of grog is:
Limestone, Gypsum Fibrosum, bauxite and iron powder are calcined, is obtained calcium oxide-calcium sulphoaluminate expansive clinker；Described calcining
Temperature is 1300 DEG C～1370 DEG C.
8. expansive agent for concrete according to claim 1 it is characterised in that described gangue in parts by weight, comprising:
21 parts～25 parts of aluminium sesquioxide；
3.7 parts～6.2 parts of iron sesquioxide.
9. expansive agent for concrete according to claim 1 is it is characterised in that described fluidized bed combustion coal ash/slag in parts by weight, wraps
Include:
24 parts～44 parts of silicon dioxide；
1 part～13.5 parts of sulfur trioxide；
2 parts～21.5 parts of calcium oxide；
11 parts～29 parts of aluminium sesquioxide；
3 parts～15 parts of iron sesquioxide；
0.5 part～1.1 parts of potassium oxide.
10. a kind of preparation method of expansive agent for concrete, comprising:
Mix grinding after expansive clinker, Gypsum Fibrosum, gangue and fluidized bed combustion coal ash/slag are crushed respectively, obtains expansive agent for concrete；
Described expansive clinker includes calcium oxide expansive clinker, calcium sulphoaluminate expansive clinker or calcium oxide-calcium sulphoaluminate expansive clinker；
The mass ratio of described expansive clinker, Gypsum Fibrosum, gangue and fluidized bed combustion coal ash/slag is (30～55): (10～20): (5～15): (30
～60).
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| CN110451847A (en) * | 2019-07-04 | 2019-11-15 | 西安建祥建材科技有限公司 | A kind of modified calcium sulphoaluminate-calcium oxide cement expansive material and preparation method thereof |
| CN114014577A (en) * | 2021-09-26 | 2022-02-08 | 江西银杉白水泥股份有限公司 | Novel white concrete expanding agent and preparation method thereof |
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