CN102617073B - Plastic concrete for cutoff wall - Google Patents
Plastic concrete for cutoff wall Download PDFInfo
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- CN102617073B CN102617073B CN201210019033.1A CN201210019033A CN102617073B CN 102617073 B CN102617073 B CN 102617073B CN 201210019033 A CN201210019033 A CN 201210019033A CN 102617073 B CN102617073 B CN 102617073B
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- 239000004567 concrete Substances 0.000 title claims abstract description 90
- 239000004568 cement Substances 0.000 claims abstract description 33
- 239000010881 fly ash Substances 0.000 claims abstract description 33
- 239000004576 sand Substances 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 16
- 239000004927 clay Substances 0.000 claims abstract description 16
- 239000004575 stone Substances 0.000 claims abstract description 16
- 239000002245 particle Substances 0.000 claims abstract description 7
- 239000012615 aggregate Substances 0.000 claims description 19
- 239000010883 coal ash Substances 0.000 claims description 15
- 235000013312 flour Nutrition 0.000 claims description 7
- 229920005646 polycarboxylate Polymers 0.000 claims description 7
- 239000002994 raw material Substances 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 2
- 229910000278 bentonite Inorganic materials 0.000 abstract 1
- 239000000440 bentonite Substances 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 9
- 230000006835 compression Effects 0.000 description 8
- 238000007906 compression Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 6
- 238000003756 stirring Methods 0.000 description 5
- 230000033228 biological regulation Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Abstract
The present invention provides a plastic concrete for a cutoff wall, and belongs to the technical field of cutoff concrete engineering. The plastic concrete comprises a cementitious material, an aggregate, a water-reducing agent and water, wherein a ratio of the water to the cementitious material in the plastic concrete is 0.92, the cementitious material comprises, by weight, 15-35 parts of cement, 10 parts of bentonite, 25 parts of clay, and 30-50 parts of fly ash, the aggregates comprises sand and stone, the sand ratio of the aggregate is 47%, per stere of the plastic concrete is added with 1485 kg of the aggregate, the particle size of the stone is 5-20 mm (continuous particle size distribution), and the plastic concrete comprises 0.2 parts by weight of the water-reducing agent. With the plastic concrete prepared by the method of the present invention, the addition amount of the fly ash can be significantly improved, and the use amount of the cement can be reduced, such that the cost of the plastic concrete is significantly reduced; based on the current raw material market price (the cement is 490 yuan/t, the type II fly ash is 160 yuan/t), the cost of per stere of the plastic concrete can be reduced by about 33-56 yuan.
Description
Technical field
The present invention relates to a kind of cut-pff wall plastic concrete, be specifically related to a kind of cut-pff wall plastic concrete of high blending flyash, belong to impervious concrete field of engineering technology.
Background technology
60～eighties of 20th century, China's cut-off wall material mainly adopts the rigid concretes such as normal concrete (also claiming Steel Concrete), clay concrete and flyash concrete, the ultimate compression strength of these concrete materials is up to 5～35MPa, Young's modulus is up to 15000～32000MPa, because its ultimate compression strength is high, Young's modulus is large, is suitable for doing the coefficient underground wall bodies such as antiseepage, gear soil and load-bearing.But iff adopting rigid concrete as cut-off wall material, its construction costs is too high, every square meter is up to 600～1200 yuan, and rigid concrete, under foundation soil horizontal force action, Local Cracking phenomenon easily occurs, cause the impermeability of cut-off wall to reduce on the contrary.
To the eighties in 20th century, China's cut-off wall material has had great innovation.The flexible materials such as plastic concrete, self-solidifying mortar constantly come out.Plastic concrete is seldom (≤200kg/m of a kind of cement consumption
3) and the concrete of admixture wilkinite, clay (adulterated flour coal ash sometimes), in this concrete, admixture wilkinite, clay etc. are as cementing matter, the cohesive force of the type cementing matter is low, and concrete intensity is reduced to a certain extent, large thereby plasticity becomes.The different concrete required plastic concrete technical indicator differences that reach of cut-pff wall engineering, generally, cut-pff wall is 28d ultimate compression strength > 2.0MPa by the technical indicator of plastic concrete, 28d Young's modulus is 500～1500MPa, coefficient of permeability K < 10
-7, entering groove slump is 20～30mm.Because plastic concrete cut-off wall has the good characteristic that Young's modulus is low, ultimate strain is large, can be out of shape with blindage, body of wall internal stress is little, so greatly improved the security of cut-pff wall.
In prior art, Chinese patent CN1834054A discloses a kind of high strength, low elasticity and anti-creepage, creeping proof wall material, comprises plastic concrete and Weathered Sand flexible materials, and wherein plastic concrete is by following component (units/kg/m
3) obtain after mixing: cement 170～190, flyash 70～90, wilkinite 90～110, rubble 68～74, sand 1300～1500, water 260～300, admixture DH0.02～0.03, admixture wood calcium 0.8～1.In the plastic concrete preparing in above-mentioned technology, the consumption of flyash accounts for 18～26wt% of gelatinous material total amount, wherein said gelling material refers to cement, flyash and bentonitic summation, and this plastic concrete has lower Young's modulus, preferably impermeability and mobility and certain early strength and higher later strength.
In above-mentioned technology, doping quantity of fly ash accounts for 18～26wt% of binder total amount, and those skilled in the art think if can meet under the prerequisite of the performance index such as plastic concrete ultimate compression strength, impermeability, further improve the volume of flyash in plastic concrete, reduce the consumption of cement in plastic concrete, the cost of the plastic concrete preparing like this will further reduce simultaneously.But, in prior art, in the time that doping quantity of fly ash accounts for binder total amount >=30%, the cohesive force of plastic concrete declines, thereby cause the early strength excessive descent of plastic concrete, and affect the early stage construction of cut-pff wall, and doping quantity of fly ash is when excessive, also can cause the performance index such as Young's modulus, later stage impermeability in plastic concrete later stage not reach the requirement of cut-pff wall plastic concrete technical indicator.And early strength on plastic concrete of particle diameter, sand coarse aggregate ratio and water-cement ratio that those skilled in the art also never recognize coarse aggregate in plastic concrete, later stage Young's modulus and the performance index such as impervious have very important impact, and if the applicant finds that these three factors of particle diameter, sand coarse aggregate ratio and water-cement ratio that can rationally control coarse aggregate just can improve doping quantity of fly ash to accounting for gelling material gross weight >=30%.
Summary of the invention
Technical problem to be solved by this invention is the plastic concrete for doping quantity of fly ash >=30wt% in prior art, the cohesive force of plastic concrete declines, thereby cause the early strength excessive descent of plastic concrete, and affect the early stage construction of cut-pff wall, and the performance index such as the Young's modulus in plastic concrete later stage, later stage impermeability do not reach cut-pff wall plastic concrete general technology index, and then when a kind of 30wt%≤doping quantity of fly ash≤50wt% is provided, meet the cut-pff wall plastic concrete that above-mentioned performance index require.
In order to solve the problems of the technologies described above, the invention provides a kind of cut-pff wall plastic concrete, comprise gelling material, aggregate, water reducer and water.
The water-cement ratio of described plastic concrete is 0.92.
Described gelling material is made up of cement, wilkinite, clay, flyash, wherein 15～35 parts of cement, 10 parts of wilkinites, 25 parts of clays, 30～50 parts, flyash.
Described aggregate is made up of sand and stone, and the sand coarse aggregate ratio of described aggregate is 47%, and add-on is counted 1485kg with every cubic metre of plastic concrete, and described cobble-stone diameter is 5～20mm continuous size fraction.
Described water reducer is 0.2 part.
Described flyash be in first level flour coal ash, second class powered coal ash and three grades of flyash any one or multiple.
Described sand is medium sand, and fineness modulus is 2.3～3.0, and particle diameter is 0.35～0.5mm.
Described water reducer is polycarboxylate water-reducer.
In the present invention, the consumption that described water-cement ratio is described water and the ratio of described gelling material gross weight.
Plastic concrete of the present invention compared with prior art tool has the following advantages:
Cut-pff wall plastic concrete of the present invention, adopts above-mentioned water-cement ratio 0.92,10 parts of wilkinites; 25 parts of clays; 0.2 part of water reducer, stone 5～20mm continuous size fraction, under the condition of sand coarse aggregate ratio 47%, while preparing plastic concrete, can increase considerably the volume of flyash in plastic concrete, doping quantity of fly ash can be increased to the 30～50wt% that accounts for gelling material gross weight, and the consumption of cement is reduced to the 15～35wt% that accounts for gelling material gross weight simultaneously.
Cut-pff wall plastic concrete of the present invention, in the time that the grating of stone is 5～20mm continuous size fraction, voidage between stone is low, only have 36.25, now select the add-on of aggregate to count 1485kg with every cubic metre of plastic concrete, aggregate sand coarse aggregate ratio is 47%, and bentonitic volume is that 10 parts, clay additive are while being 25 parts, sand, wilkinite and clay in aggregate can be filled in the space of stone completely, makes concrete more closely knit; Under above-mentioned wilkinite volume and clay additive, the effect of the coated aggregate of wilkinite and clay is best in addition; It is 0.92 o'clock that the present invention simultaneously arranges water-cement ratio, can make the cohesive strength of gelling material in plastic concrete reach optimum regime, under this condition, can supplement due to the raising of doping quantity of fly ash, the problem that cement consumption reduces the plastic concrete early strength excessive descent causing.Also make flyash in great mixed amount give full play to micro aggregate effect that Additive has and the shape effect as inertia, can improve the workability of plastic concrete mix, improve water retention property, be conducive to pumping construction simultaneously.
Cut-pff wall of the present invention with in plastic concrete because doping quantity of fly ash improves and the minimizing of cement consumption, the cost of the plastic concrete that the present invention prepares is significantly reduced.With 490 yuan/t of current raw material market price cement, 160 yuan/t of second class powered coal ash calculates, and the cost of every side's plastic concrete can reduce approximately 33～56 yuan.
Embodiment
Below in conjunction with embodiment, the present invention is further described in detail, but is not limited to this.
embodiment 1
In every cubic metre of plastic concrete, 315kg water, 34.2kg wilkinite, 85.5kg clay, 0.648kg polycarboxylate water-reducer, 119.7kg cement, tri-grades of flyash of 102.6kg, 698kg sand, 787kg stone are mixed, stir and prepare plastic concrete A.
In above-mentioned raw materials, water-cement ratio is 0.92.
embodiment 2
In every cubic metre of plastic concrete, 315kg water, 34.2kg wilkinite, 85.5kg clay, 0.648kg polycarboxylate water-reducer, 102.6kg cement, 50kg first level flour coal ash, 69.7kg second class powered coal ash, 698kg sand, 787kg stone are mixed, stir and prepare plastic concrete B.
Water-cement ratio 0.92 in above-mentioned raw materials.
embodiment 3
In every cubic metre of plastic concrete, 315kg water, 34.2kg wilkinite, 85.5kg clay, 0.648kg polycarboxylate water-reducer, 85.5kg cement, 136.8kg second class powered coal ash, 698kg sand, 787kg stone are mixed, stir and prepare plastic concrete C.
Water-cement ratio 0.92 in above-mentioned raw materials.
embodiment 4
In every cubic metre of plastic concrete, 315kg water, 34.2kg wilkinite, 85.5kg clay, 0.648kg polycarboxylate water-reducer, 68.4kg cement, 153.9kg second class powered coal ash, 698kg sand, 787kg stone are mixed, stir and prepare plastic concrete D.
Water-cement ratio 0.92 in above-mentioned raw materials.
embodiment 5
In every cubic metre of plastic concrete, 315kg water, 34.2kg wilkinite, 85.5kg clay, 0.648kg polycarboxylate water-reducer, 51.3kg cement, 171kg first level flour coal ash, 698kg sand, 787kg stone are mixed, stir and prepare plastic concrete E.
Water-cement ratio 0.92 in above-mentioned raw materials.
The raw material that used is in the above-described embodiments commercially available prod, and wherein said first level flour coal ash, second class powered coal ash, three grades of flyash are to divide by fineness, are specifically respectively:
Cement: ordinary Portland cement P425, east, Ji board;
Stone: 5～20mm, continuous size fraction, Zhuozhou, the place of production;
Sand: medium sand, fineness modulus is 2.3～3.0, median size is 0.35～0.5mm, Zhuozhou, the place of production;
Wilkinite, clay: Hua Wei wilkinite Group Plc produces;
First level flour coal ash, second class powered coal ash, three grades of flyash: electric power flyash industrial of Beijing produces.
performance measurement evaluation Example
Get the plastic concrete that above-described embodiment 1 to 5 prepares and carry out 28d ultimate compression strength, 60d ultimate compression strength, 28d Young's modulus, permeability coefficient, slump performance test, test result is in table 1.
Described slump performance test methods and instrument are carried out in strict accordance with 5150-2001 " concrete for hydraulic structure testing regulation ".
Described intensity test method and instrument are carried out in strict accordance with 5150-2001 " concrete for hydraulic structure testing regulation ".
Described Young's modulus testing method and instrument are carried out in strict accordance with 5150-2001 " concrete for hydraulic structure testing regulation ".
Described permeability coefficient testing method and instrument are carried out in strict accordance with 5150-2001 " concrete for hydraulic structure testing regulation ".
The test result of table 1 embodiment 1～5:
Can find out from above-mentioned test result, the plastic concrete that the present invention prepares, in the time that doping quantity of fly ash accounts for 30～50wt% of gelling material gross weight, its slump is that 20～29mm, diffusibleness are that 30～45mm, 28d ultimate compression strength are 4.9～3.1MPa, 60d ultimate compression strength is 7.5～7.0MPa, Young's modulus is 1118～798MPa, and permeability coefficient is 1.40310
-9～2.29510
-9, its performance index all meet the technical performance index of plastic concrete.
Obviously, above-described embodiment is only for example is clearly described, and the not restriction to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without also giving all embodiments, and the apparent variation of being extended out thus or variation are still among the protection domain in the invention claim.
Claims (4)
1. a cut-pff wall plastic concrete, is characterized in that, comprises gelling material, aggregate, water reducer and water;
The water-cement ratio of described plastic concrete is 0.92;
Described gelling material is made up of cement, wilkinite, clay, flyash, wherein 15～35 parts of cement, 10 parts of wilkinites, 25 parts of clays, 30～50 parts, flyash;
Described aggregate is made up of sand and stone, and the sand coarse aggregate ratio of described aggregate is 47%, and add-on is counted 1485kg with every cubic metre of plastic concrete, and the particle diameter of described stone is 5～20mm continuous size fraction;
Described water reducer is 0.2 part.
2. cut-pff wall plastic concrete according to claim 1, is characterized in that, described flyash be in first level flour coal ash, second class powered coal ash and three grades of flyash any one or multiple.
3. according to the arbitrary described cut-pff wall plastic concrete of claim 1～2, it is characterized in that, described sand is medium sand, and fineness modulus is 2.3～3.0, and particle diameter is 0.35～0.5mm.
4. according to the arbitrary described cut-pff wall plastic concrete of claim 1～3, it is characterized in that, described water reducer is polycarboxylate water-reducer.
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|---|---|---|---|
| CN201210019033.1A CN102617073B (en) | 2012-01-20 | 2012-01-20 | Plastic concrete for cutoff wall |
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|---|---|---|---|
| CN201210019033.1A CN102617073B (en) | 2012-01-20 | 2012-01-20 | Plastic concrete for cutoff wall |
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| CN102617073A CN102617073A (en) | 2012-08-01 |
| CN102617073B true CN102617073B (en) | 2014-06-11 |
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