CN106116281A - Coral reef sand concrete and preparation method thereof - Google Patents
Coral reef sand concrete and preparation method thereof Download PDFInfo
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- CN106116281A CN106116281A CN201610446744.5A CN201610446744A CN106116281A CN 106116281 A CN106116281 A CN 106116281A CN 201610446744 A CN201610446744 A CN 201610446744A CN 106116281 A CN106116281 A CN 106116281A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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Abstract
The invention discloses a kind of Coral Reef Sand Concrete and preparation method, this concrete folk prescription material usage, cement 380～420kg, flyash 0～40kg, coral sand 550～650kg, rubble 1150～1250kg, additive 4.5～6.5kg, anti-adsorbent 0.27～0.39kg, additional water flowing rate 35～45kg, net duty of water 180～190kg.This preparation method uses the closely packed model considering aggregate particle shape, grating and working performance of concrete thereof to determine the sand coarse aggregate ratio of concrete under different flow regime, and uses water-absorption characteristics point to determine additional water flowing rate.The present invention solves and prepares Coral Reef Sand Concrete poor fluidity and the low shortcoming of strength grade by existing method, and it is high that prepared Coral Reef Sand Concrete has strength grade, good fluidity, and little loss of slump is the most easy to crack, and the advantage such as unit consumption of water is little.
Description
Technical field
The present invention relates to maritime concrete, in particular to a kind of Coral Reef Sand Concrete and preparation method thereof.
Background technology
China's off-lying sea islands and reefs lack away from the mainland, goods and materials and freshwater resources, in the construction to these off-lying sea islands and reefs
Cheng Zhong, it is too high that the use of traditional building material does not only exist marine transportation arduous task, cost of transportation, and serious restriction China is to far
Large scale construction, management and the development of resources in sea.In order to solve this problem, it may be considered that make full use of the former material around islands and reefs
Islands and reefs are built by material, wherein, utilize coral reef sand fine aggregate to replace fluvial sand mixing concrete, are not required to by preparing some
Want the prevention of marine concrete structures of arrangement of reinforcement, such as shore protection, breakwater etc., be possible not only to break away from remote seaborne restriction, and
Can significantly save construction costs.
Coral reef sand is mainly made up of reef-building coral bits, and containing coral reef sand and other marine organisms bone fragments, its
Under wind and hydrodynamism, original place is piled up or closely formation reef platform, the developing environment of coral reef sand, thing are piled up in carrying strange land
Matter forms and architectural feature is allowed to loose porous and matter is crisp frangible, becomes a kind of special Lithology type.With Lu Yuan quartz sand facies
Less than having diverse engineering properties, coral reef sand to have modulus of fineness, grain type is irregular, disproportionately graded, mechanical property
Difference, voidage and water absorption rate are big, and fine particle content is many, easily adsorb the features such as additive.Existing concrete is referring especially to JGJ 55-
2011 " design of common concrete proportioning codes " and JGJ 51-2002 " light aggregate concrete technical regulation " the two specification are entered
Row proportion design, coral reef sand water absorption rate is big, density is little, disproportionately graded, relatively big with common fluvial sand performance difference, uses " common
Mix Design code " parameter such as sand coarse aggregate ratio and water-cement ratio of carrying out mix-design acquirement is often bigger with physical presence
Gap, it is impossible to meet requirement.Owing to coral reef sand density is less than fluvial sand, and " light aggregate concrete technical regulation " considers aggregate
Water absorption, therefore the preparation of existing Coral Reef Sand Concrete is many carries out proportion design according to " light aggregate concrete technical regulation ", but
It is when utilizing coral reef sand fine aggregate to replace fluvial sand mixing concrete, and unit consumption of water the most easily occurs in gained concrete
Greatly, admixture dosage is high, and concrete strength is low, poor fluidity, shrinks the most easy to crack, the shortcomings such as slump-loss is big.
Summary of the invention
Present invention aim to provide a kind of Coral Reef Sand Concrete and preparation method thereof, this Coral Reef Sand Concrete
Function admirable, has strength grade high, good fluidity, and little loss of slump is the most easy to crack, and the advantage such as unit consumption of water is little.
For achieving the above object, the technical solution used in the present invention is: a kind of Coral Reef Sand Concrete, and folk prescription material is used
Amount, cement 380～420kg, flyash 0～40kg, coral sand 550～650kg, rubble 1150～1250kg, additive 4.5～
6.5kg, anti-adsorbent 0.27～0.39kg, additional water flowing rate 35～45kg, net duty of water 170～190kg.
Further, folk prescription material usage, cement 400～420kg, flyash 20～40kg, coral sand 600～630kg,
Rubble 1164～1222kg, additive 5～6.3kg, anti-adsorbent 0.3～0.33kg, additional water flowing rate 36～38kg, net duty of water
180～185kg.
Further, described anti-adsorbent is ethers polycarboxylic acid water reducing agent.
Further, described additive is polycarboxylate water-reducer.
The preparation method of a kind of Coral Reef Sand Concrete, for grating and the grain type of coral reef sand, uses and considers bone
The closely packed model of material grain type, grating and working performance of concrete thereof determines the sand coarse aggregate ratio under different flow regime, adopts meanwhile
Determining additional water flowing rate with water-absorption characteristics point, " light-weight aggregate mixes then to substitute JGJ 51-2002 with described sand coarse aggregate ratio and described additional water flowing rate
Solidifying soil technical regulation " in relevant parameter after determine coral reef according still further to JGJ 51-2002 " light aggregate concrete technical regulation "
The match ratio of sand concrete.
Further, the preparation method of described Coral Reef Sand Concrete, comprise the following steps:
1) sand coarse aggregate ratio is determined: utilize closely packed model formula:
Determining the sand coarse aggregate ratio of Coral Reef Sand Concrete, wherein, A is the percentage ratio that solid particle passes through slot size d；D is
System maximum particle diameter；B is the percentage ratio that gelling system accounts for the total system of dry blend；N is profile exponent；
2) additional water flowing rate is determined: find the critical point that coral reef sand absorption speed speed changes, with suction during this critical point
The water yield is as the additional water flowing rate of Coral Reef Sand Concrete；
3) by step 1) in the sand coarse aggregate ratio that determines and step 2) in the additional water flowing rate that determines substitute JGJ51-2002 " light-weight aggregate mix
Solidifying soil technical regulation " in sand coarse aggregate ratio and additional water flowing rate, then by cement, flyash, coral sand, rubble, additive, anti-adsorbent
And water carries out proportioning according to JGJ 51-2002 " light aggregate concrete technical regulation ", prepare Coral Reef Sand Concrete.
Further, described step 1) include step in detail below:
1. determine b value: after determining sand coarse aggregate ratio according to maximum bulk density, under identical water-cement ratio, use coral reef sand to join
N processed (N >=5) organizes normal concrete, adjusts gel material content, and mapping draws the relation of the slump and b value, coral as requested
The coral reef sand concrete slump chooses corresponding b value；
2. determining n value: the dry blend separately taking described N group normal concrete carries out sieve test, sieving rate accumulative to N group is bent
Line carries out the power function nonlinear regression of method of least square, and gained power exponent is profile exponent n value；
3. rendering model curve: draw model curve according to b value, n value and described closely packed model formula；
4. sand coarse aggregate ratio is calculated: calculate cement in Coral Reef Sand Concrete, coral reef sand according to model curve, and rubble is each
Usage ratio, i.e. can get sand coarse aggregate ratio.
Further, described step 2) include step in detail below:
1. coral reef sand is carried out the moisture content test, make water absorption rate according to result of the test and change over curve, at song
Find flex point as full water characteristic point on line；
2. the water absorption of coral reef sand is calculated as Coral Reef Sand Concrete according to the water absorption rate that described flex point is corresponding
Additional water flowing rate.
Further, the sand coarse aggregate ratio of described Coral Reef Sand Concrete is 30～35%.
Further, the additional water flowing rate of described Coral Reef Sand Concrete is 35～45kg/ folk prescription materials.
Compared with prior art, the invention have the advantages that
One, compares and does not takes into account grading of aggregates difference and grain type irregular in " light aggregate concrete technical regulation ", this
Invent for coral reef sand grating difference and the irregular feature of grain type, use and consider aggregate particle shape, grating and concrete thereof
The closely packed model of service behaviour determines the sand coarse aggregate ratio of Coral Reef Sand Concrete under different flow regime, solves and uses existing side
Method prepares Coral Reef Sand Concrete poor fluidity and the low shortcoming of strength grade.
Its two, " light aggregate concrete technical regulation " is although it is contemplated that the water absorption of aggregate, but in this specification is to pass through
The quality of calculating aggregate 1h absorption moisture is as additional water flowing rate, and the present invention is directed to the feature that coral reef sand water absorption rate is big, uses
Water-absorption characteristics point determines additional water flowing rate, is found by experimental study, and the water suction of coral reef sand has the advantages that the later stage is slow the soonest, and
And (differ sometime and be set to 1h) and there is an obvious flex point, before this flex point, moisture can enter Corallium Japonicum Kishinouye faster
In reef sand hole gap, and exceeding this time point, moisture enters intrapore speed will be slack-off, and therefore, the present invention chooses this flex point
Time coral reef sand water absorption the most accurate as additional water flowing rate, prepare Coral Reef Sand Concrete performance be substantially better than according to former
Specification preparation.
Its three, sand coarse aggregate ratio and the additional water flowing rate value of coral sand concrete are optimized by the present invention, and sand coarse aggregate ratio is by existing
36～40% are modified to 30～35%, and additional water flowing rate is modified to 35～45kg/ folk prescription materials by existing 10～15kg/ folk prescription materials
Material, it is high that the Coral Reef Sand Concrete prepared has strength grade, good fluidity, and little loss of slump is the most easy to crack, and unit is used
The advantages such as the water yield is little.
Accompanying drawing explanation
Fig. 1 is b value and the slump graph of a relation of the normal concrete using the preparation of coral reef sand.
Fig. 2 is the linear regression curves of S1 group normal concrete dry blend.
Fig. 3 is coral reef sand closely packed model curve.
Fig. 4 is coral reef sand water absorption rate-time chart.
Detailed description of the invention
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings, it is simple to more clearly understands this
Invention, but they do not constitute restriction to the present invention.
Embodiment 1～3
For coral reef sand grating difference and the irregular feature of grain type, use and consider aggregate particle shape, grating and mix
The closely packed model of solidifying soil service behaviour determines the sand coarse aggregate ratio of concrete, closely packed model formula under different flow regime
For:
Wherein, A is the percentage ratio that solid particle passes through sieve aperture d；D is system maximum particle diameter；B is that gelling system accounts for total system
Percentage ratio, depend on the workability requirement of concrete；N is profile exponent.
Step 1) determine the sand coarse aggregate ratio of coral sand concrete
1. b value is determined
Under identical water-cement ratio, by adjusting Binder Materials (cement, flyash etc.) consumption, use coral reef sand preparation S1
～S7 totally 7 groups of normal concretes, research concrete divergence and the relation of b value, b is that gelling system accounts for the hundred of the total system of dry blend
Proportion by subtraction.Wherein, the proportioning of S1～S7 group concrete is as shown in table 1 below.
Table 1
By test, mapping draws the relation of b value and concrete slump as shown in Figure 1.
2. n value is determined
7 groups of concrete dry batch mixings of above S1～S7 are carried out sieve test, and concrete dry batch mixing sieve test result is such as
Shown in table 2.
Table 2
To S1～S7 totally 7 groups add up sieving rate curve and carry out the power function nonlinear regression of method of least square, wherein, S1 group
Concrete dry batch mixing Regression Analysis Result is as in figure 2 it is shown, gained power exponent is profile exponent n.By regression analysis, each group
Profile exponent result is as shown in table 3.
Table 3
Can be seen that according to this 7 profile exponent result assembling composition and division in a proportion of S1～S7, it is the most suitable that profile exponent n takes 0.35.Knot
Closing Fig. 1 result, thus draw concrete closely packed model parameter value scope, this span is as shown in table 4.
Table 4
3. rendering model curve
Can be found by table 4, when taking the Coral Reef Sand Concrete slump and being 180mm, b value is 20, and n is 0.35, according to front
Stating closely packed model formula and draw coral reef sand closely packed model curve, this model curve is as shown in Figure 3.
4. sand coarse aggregate ratio is calculated
According to the coral reef sand closely packed model curve shown in Fig. 3, calculate coral reef sand coagulation through this model curve
The soil slump is cement (powder body), coral reef sand (fine aggregate), rubble (coarse aggregate) respective amount ratio in concrete when being 180mm
Example, then by sand coarse aggregate ratio=coral reef sand usage ratio/(coral reef sand usage ratio+coarse aggregate usage ratio), obtains sand coarse aggregate ratio about
It is 34%.
Step 2) additional water flowing rate determines
Using water-absorption characteristics point to determine additional water flowing rate, coral reef sand carries out the moisture content test, concrete test method is as follows:
Placing a certain amount of coral reef sand in volumetric flask, add the water of 80%, shake 2min, constant volume, along with the water suction of coral reef sand, liquid
Face can decline, the most again constant volume, weighs quality, calculates water suction quality.Method according to this, according to the water suction in 48h
Rate experimental result, draws the water absorption character curve of coral reef sand, and this curve is as shown in Figure 4.As can be seen from Figure 4 coral reef sand
Water-absorption characteristics o'clock is 6%, and additional water flowing rate is the water absorption of coral sand 6%.
Step 3) Coral Reef Sand Concrete mix-design
From abovementioned steps 1) and step 2), Coral Reef Sand Concrete match ratio sand coarse aggregate ratio is 34%, and additional water consumption is
The 6% of coral reef chiltern amount.Carry out mix-design according to " light aggregate concrete technical regulation " (JGJ 51-2002), obtain
The Coral Reef Sand Concrete match ratio of embodiment 1～3 is as follows:
Embodiment 1: folk prescription material usage, cement 380kg, flyash 20kg, coral sand 630kg, rubble 1222kg, additional
Agent 4.5kg, anti-adsorbent 0.28kg, additional water flowing rate 36kg, net duty of water 175kg.
Embodiment 2: folk prescription material usage, cement 400kg, flyash 20kg, coral sand 600kg, rubble 1164kg, additional
Agent 5.0kg, anti-adsorbent 0.30kg, additional water flowing rate 36kg, net duty of water 180kg.
Embodiment 3: folk prescription material usage, cement 420kg, flyash 40kg, coral sand 600kg, rubble 1164kg, additional
Agent 6.3kg, anti-adsorbent 0.33kg, additional water flowing rate 38kg, net duty of water 185kg.
Additive in embodiment 1～3 uses polycarboxylate water-reducer, and anti-adsorbent uses ethers polycarboxylic acid water reducing agent, its
Acid ether ratio is for 3.5:1, and side chain molecular weight is 2500.
The performance test results of the Coral Reef Sand Concrete of embodiment 1～3 is as shown in table 5.
Table 5
| Embodiment | The slump/mm | 1h slump-loss/mm | 28d comprcssive strength/Mpa |
| 1 | 200 | 50 | 32.9 |
| 2 | 205 | 55 | 37.9 |
| 3 | 210 | 60 | 45.9 |
By table 5 data it can be seen that the Coral Reef Sand Concrete of the present invention has little loss of slump, comprcssive strength is high
Characteristic, its performance is substantially better than the existing coral sand concrete with reference to specification preparation.
Claims (10)
1. a Coral Reef Sand Concrete, it is characterised in that: folk prescription material usage, cement 380～420kg, flyash 0～
40kg, coral sand 550～650kg, rubble 1150～1250kg, additive 4.5～6.5kg, anti-adsorbent 0.27～0.39kg,
Additional water flowing rate 35～45kg, net duty of water 170～190kg.
2. according to the Coral Reef Sand Concrete described in claim 1 or 2 or 3, it is characterised in that: folk prescription material usage, cement 400
～420kg, flyash 20～40kg, coral sand 600～630kg, rubble 1164～1222kg, additive 5～6.3kg, anti-suction
Attached dose 0.3～0.33kg, additional water flowing rate 36～38kg, net duty of water 180～185kg.
Coral Reef Sand Concrete the most according to claim 1 and 2, it is characterised in that: described anti-adsorbent is the poly-carboxylic of ethers
Acid water reducer.
Coral Reef Sand Concrete the most according to claim 1 and 2, it is characterised in that: described additive is polycarboxylic acids diminishing
Agent.
5. the preparation method of a Coral Reef Sand Concrete, it is characterised in that: for grating and the grain type of coral reef sand, use and combine
Close the sand considering that the closely packed model of aggregate grain type, grating and working performance of concrete thereof determines under different flow regime
Rate, meanwhile, uses water-absorption characteristics point to determine additional water flowing rate, then substitutes JGJ 51-with described sand coarse aggregate ratio and described additional water flowing rate
After relevant parameter in 2002 " light aggregate concrete technical regulations ", according still further to JGJ 51-2002, " light aggregate concrete technology is advised
Journey " determine the match ratio of Coral Reef Sand Concrete.
The preparation method of Coral Reef Sand Concrete the most according to claim 5, it is characterised in that: comprise the following steps:
1) sand coarse aggregate ratio is determined: utilize closely packed model formula:
Determining the sand coarse aggregate ratio of Coral Reef Sand Concrete, wherein, A is the percentage ratio that solid particle passes through slot size d；D is system
Maximum particle diameter；B is the percentage ratio that gelling system accounts for total system；N is profile exponent；
2) additional water flowing rate is determined: find the critical point that coral reef sand absorption speed speed changes, with water absorption during this critical point
Additional water flowing rate as Coral Reef Sand Concrete；
3) by step 1) in the sand coarse aggregate ratio that determines and step 2) in the additional water flowing rate that determines substitute JGJ51-2002 " light aggregate concrete
Technical regulation " in sand coarse aggregate ratio and additional water flowing rate, then by cement, flyash, coral sand, rubble, additive, anti-adsorbent and water
Carry out proportioning according to JGJ 51-2002 " light aggregate concrete technical regulation ", prepare Coral Reef Sand Concrete.
The preparation method of Coral Reef Sand Concrete the most according to claim 6, it is characterised in that: described step 1) include
Step in detail below:
1. determine b value: after determining sand coarse aggregate ratio according to maximum bulk density, under identical water-cement ratio, use coral reef sand preparation N (N
>=5) group normal concrete, adjusts gel material content, and mapping draws the relation of the slump and b value, coral reef as requested
The sand concrete slump chooses corresponding b value；
2. determining n value: the dry blend separately taking described N group normal concrete carries out sieve test, sieving rate curve accumulative to N group enters
The power function nonlinear regression of row method of least square, gained power exponent is profile exponent n value；
3. rendering model curve: draw model curve according to b value, n value and described closely packed model formula；
4. sand coarse aggregate ratio is calculated: calculate cement in Coral Reef Sand Concrete, coral reef sand, and the respective use of rubble according to model curve
Amount ratio, i.e. can get sand coarse aggregate ratio.
The preparation method of Coral Reef Sand Concrete the most according to claim 6, it is characterised in that: described step 2) include
Step in detail below:
1. coral reef sand is carried out the moisture content test, make water absorption rate according to result of the test and change over curve, on curve
Find flex point as full water characteristic point；
2. water absorption the adding as Coral Reef Sand Concrete of coral reef sand is calculated according to the water absorption rate that described flex point is corresponding
The water yield.
9. according to the preparation method of the Coral Reef Sand Concrete according to any one of claim 5～8, it is characterised in that: described
The sand coarse aggregate ratio of Coral Reef Sand Concrete is 30～35%.
10. according to the preparation method of the Coral Reef Sand Concrete according to any one of claim 5～8, it is characterised in that: described
The additional water flowing rate of Coral Reef Sand Concrete is 35～45kg/ folk prescription materials.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107056154A (en) * | 2017-04-11 | 2017-08-18 | 武汉理工大学 | A kind of preparation method of the ultra-high-strength cement-based composites of low water reducer consumption |
| CN108164205A (en) * | 2018-01-11 | 2018-06-15 | 宁波丰尔泰建材科技有限公司 | A kind of antimildew and antibacterial ancient painted pottery plate and preparation method thereof |
| CN111499305A (en) * | 2020-04-28 | 2020-08-07 | 广西大学 | Use of coral sand and/or coral skeleton in preparing low-radioactivity building material |
| CN111582724A (en) * | 2020-05-09 | 2020-08-25 | 中交第四航务工程勘察设计院有限公司 | Design method for mix proportion of cement-stabilized coral reef mixture |
-
2016
- 2016-06-20 CN CN201610446744.5A patent/CN106116281B/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107056154A (en) * | 2017-04-11 | 2017-08-18 | 武汉理工大学 | A kind of preparation method of the ultra-high-strength cement-based composites of low water reducer consumption |
| CN108164205A (en) * | 2018-01-11 | 2018-06-15 | 宁波丰尔泰建材科技有限公司 | A kind of antimildew and antibacterial ancient painted pottery plate and preparation method thereof |
| CN108164205B (en) * | 2018-01-11 | 2019-10-11 | 宁波丰尔泰建材科技有限公司 | A kind of antimildew and antibacterial ancient painted pottery plate and preparation method thereof |
| CN111499305A (en) * | 2020-04-28 | 2020-08-07 | 广西大学 | Use of coral sand and/or coral skeleton in preparing low-radioactivity building material |
| CN111582724A (en) * | 2020-05-09 | 2020-08-25 | 中交第四航务工程勘察设计院有限公司 | Design method for mix proportion of cement-stabilized coral reef mixture |
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| CN106116281B (en) | 2018-10-16 |
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