CN101898388A - Extrusion type flexible concrete mixing proportion design method - Google Patents
Extrusion type flexible concrete mixing proportion design method Download PDFInfo
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- CN101898388A CN101898388A CN 201010164519 CN201010164519A CN101898388A CN 101898388 A CN101898388 A CN 101898388A CN 201010164519 CN201010164519 CN 201010164519 CN 201010164519 A CN201010164519 A CN 201010164519A CN 101898388 A CN101898388 A CN 101898388A
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Abstract
The invention relates to an extrusion type flexible concrete mixing proportion design method which comprises the following mixing proportion design steps: selecting and detecting raw materials; designing the basic mixing proportion of the detected raw materials; and verifying and testing the concrete raw materials designed according to the basic mixing proportion on the spot, and then, determining the construction mixing proportion, thereby finishing the extrusion type flexible concrete mixing proportion design. The method provided by the invention thoroughly abandons the conventional concrete mixing proportion design method and is more suitable for the extrusion construction of the hard concrete. The concrete designed by the method of the invention meets the actual construction equipment better, and the performance of the concrete in actual construction is closer to the indoor test result, thereby being convenient for controlling the construction quality and effectively ensuring the concrete construction quality.
Description
Technical field
The present invention relates to a kind of extrusion type flexible concrete mixing proportion design method that is used for, be applicable to the flexible concrete match ratio design of extrusion modling, as CFRD extrusion side wall mix Design
Technical background
The used concrete of extrusion type flexible concrete is a dry concrete, slump is zero, and the specification requirement that its performance should satisfy is: can reach certain packing by extruding, have lower compression strength and elastic modelling quantity, and have higher permeability, and convenient construction.Because extrusion equipment is responsive for concrete mixture ratio, be concrete permeable and the intensity index after the assurance extrusion modling, need determine parameters such as its match ratio and additive by the concrete mix test.Because characteristics such as low strong low bullet of extrusion type flexible concrete and mixture dry make that this kind concrete and conventional concrete workability and performance difference are very big, can not adopt conventional concrete mixing proportion design method to design.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of extrusion type flexible concrete mixing proportion design method, this method is according to engine request, structural shape, execution conditions and situation of raw materials, determine the ratio of cement, sandstone compound, additive, water by correlation test, design makes the concrete that satisfies specification requirement, Workable, economical rationality.
The object of the present invention is achieved like this: a kind of extrusion type flexible concrete mixing proportion design method, the match ratio design procedure is: raw material are selected and are detected, raw material after tested designs basic match ratio, concrete material by basic match ratio design is determined the construction match ratio after the on-site verification test, finish the design of extrusion type flexible concrete match ratio.
Selected raw material is sandstone compound and cement, the sandstone compound maximum particle diameter of selecting for use is not more than 20mm, and the particle of＜5mm is 30%～55%, clay content＜7%, cement employing strength grade is 32.5 cement, and cement consumption is 3%～7% of an aggregate dry mass.
Water consumption is determined according to Proctor compaction test in the match ratio, promptly adopts Proctor compaction test to determine optimum moisture content to each cement consumption concrete wet feed.Adopt the cube die trial of 150mm * 150mm * 150mm then, calculate the concrete wet feed quality of preparation according to optimum moisture content, dry density and test specimen volume, carry out the cube specimen hydrostatic profile with the concrete wet feed that calculates, briquetting pressure determines according to the extruding force of practice of construction extrusion equipment, gets that the maximum dry density of the test specimen of test specimen height between 150mm～152mm is basic dry density after the moulding.According to basic dry density, optimum moisture content, adopt the test specimen of hydrostatic profile method moulding concrete performance test again, comprising: tests such as cubic compressive strength, cylindrical compressive strength, elastic modelling quantity, infiltration coefficient.The minimum cement dosage that meets design requirement by every technical indicator add 0.5% and optimum moisture content recommend basic match ratio, adopt the basic match ratio of recommending to carry out the on-site verification test, adopt one section extrusion side wall test section of site operation equipment extrusion modling, length is not less than 30m, detect its dry density, be no less than 9 groups, press fraction 90% and calculate the dry density typical value, the cement consumption value that meets design requirement with every technical indicator in the on-site verification test is the design cement consumption, press fraction 90% with the corresponding on-the-spot dry density that detects and calculate the dry density typical value, as the design dry density.So far finish the design of extrusion type flexible concrete match ratio.
Method provided by the invention has casted off conventional concrete mixing proportion design method once and for all, be fit to the extruding construction of this dry concrete more, adopt the more realistic construction equipment of concrete of this method design, the concrete performance of practice of construction is more near laboratory test results, be convenient to quality control on construction, effectively guaranteed concrete construction quality.
The specific embodiment
Embodiment: extrusion type flexible concrete mixing proportion design method provided by the invention, its main design procedure is as follows:
Raw material detection → basic match ratio design → on-site verification test → construction match ratio is determined.
1 raw material detect
1.1 sandstone aggregate: before match ratio design, should get decide in the stock ground representational aggregate and do grading analysis; To the aggregate of disproportionately graded, should improve its grating, make it to satisfy maximum particle diameter 20mm, the particle of＜5mm is preferably 30%～55%, the requirement of clay content＜7%.
1.2 cement: should adopt strength grade is 32.5 cement, checks its intensity and setting time.
1.3 additive: early strength water-reducing agent detects by DL/T5100, and liquid accelerator detects by JC 477.
2 basic match ratio designs
2.1 adopt with a kind of aggregate respectively by 4 cement consumptions such as 3.5%, 4.5%, 5.5%, 6.5% and mix the additive concrete batching.
2.2 carry out Proctor compaction test, draw the relation curve of cement dosage and optimum moisture content, maximum dry density, determine the concrete optimum moisture content of each cement consumption.
2.3 determine the basic density of per a kind of cement consumption, method is as follows:
2.3.1 use the cube die trial of 150mm * 150mm * 150mm.
2.3.2 according to the volume of optimum moisture content, dry density and cube specimen, some parts of the concrete of preparation respective quality, dry density is generally at 1.90g/cm
3～2.25g/cm
3Selected in the scope.
2.3.3 every part all by hydrostatic profile method moulding cube specimen, the compression during moulding is 1.37MPa.
2.3.4 the maximum dry density of getting height test specimen between 150mm～152mm is as basic dry density.
2.4 to per a kind of cement consumption, according to basic dry density, optimum moisture content, shaping test piece, standard curing to regulation is carried out tests such as cubic compressive strength, cylindrical compressive strength, elastic modelling quantity, infiltration coefficient after the length of time.
2.5 the minimum cement dosage that meets design requirement by every technical indicator add 0.5% and optimum moisture content recommend basic match ratio.
The test of 3 on-site verifications
3.1 prepare concrete by basic match ratio.
3.2 adopt one section extrusion side wall test section of site operation equipment extrusion modling, length is not less than 30m, detects its dry density, is no less than 9 groups; Press fraction 90% and calculate the dry density typical value.
3.3 prepare test specimen by the typical value that detects dry density, detect test items such as its cubic compressive strength, cylindrical compressive strength, elastic modelling quantity, infiltration coefficient, do not meet design requirement as testing result, should adjust cement consumption and test till meeting design requirement again.
The calculating of 4 construction match ratios
4.1 the cement consumption value that meets design requirement with every testing result in the field trial is design cement consumption C%, the typical value of its corresponding on-the-spot dry density that detects is design dry density ρ
d(g/cm
3).
4.2 material usage calculates (kg/m
3)
4.2.1 cement consumption:
4.2.2 aggregate consumption: M
G=(ρ
d-M
c) * (1+w
c), w in the formula
c-water content ratio of aggregate.
4.2.3 additive consumption: M
j=j% * M
c, j%-admixture dosage in the formula.
4.2.4 water consumption: M
w=w
Op* ρ
d-(ρ
d-M
c) * w
c-M
j* w
j, w in the formula
Op-optimum moisture content, w
jThe content of water in the-additive.
Claims (5)
1. extrusion type flexible concrete mixing proportion design method, it is characterized in that: the match ratio design procedure is: raw material are selected and are detected, raw material after tested designs basic match ratio, concrete material by basic match ratio design is determined the construction match ratio after the on-site verification test, finish the design of extrusion type flexible concrete match ratio.
2. extrusion type flexible concrete mixing proportion design method according to claim 1, it is characterized in that: the mix Design water consumption is pressed Proctor compaction test and is determined, that is: by Proctor compaction test, determine the concrete optimum moisture content of each cement consumption.
3. extrusion type flexible concrete mixing proportion design method according to claim 1, it is characterized in that: adopt the cube die trial of 150mm * 150mm * 150mm, calculate the concrete wet feed quality of preparation according to optimum moisture content, dry density and test specimen volume, carry out the cube specimen hydrostatic profile with the concrete wet feed that calculates, briquetting pressure determines according to the extruding force of practice of construction extrusion equipment, gets that the maximum dry density of the test specimen of test specimen height between 150mm～152mm is basic dry density after the moulding.
4. extrusion type flexible concrete mixing proportion design method according to claim 1, it is characterized in that: according to basic dry density, optimum moisture content, adopt the test specimen of hydrostatic profile method moulding concrete performance test, comprising: tests such as cubic compressive strength, cylindrical compressive strength, elastic modelling quantity, infiltration coefficient.
5. extrusion type flexible concrete mixing proportion design method according to claim 1 is characterized in that: the minimum cement dosage that meets design requirement by every performance indications add 0.5% and optimum moisture content recommend basic match ratio.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104261731A (en) * | 2014-07-08 | 2015-01-07 | 北京东方建宇混凝土科学技术研究院有限公司 | Design method for mix proportion of recycled aggregate concrete |
| CN106116317A (en) * | 2016-06-30 | 2016-11-16 | 中国水利水电第五工程局有限公司 | A kind of high-ductility concrete and the method controlling its mix performance |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1033246C (en) * | 1991-12-21 | 1996-11-06 | 李德贵 | Method and equipment for quick test of concrete proportioning |
| CN101058495A (en) * | 2007-05-25 | 2007-10-24 | 武永新 | Micro-slump concrete for roller compacted concrete dam and construction method thereof |
| CN101081527A (en) * | 2007-06-10 | 2007-12-05 | 王昱海 | Confecting method of modern concrete and the mixing proportion thereof |
-
2010
- 2010-05-07 CN CN 201010164519 patent/CN101898388A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1033246C (en) * | 1991-12-21 | 1996-11-06 | 李德贵 | Method and equipment for quick test of concrete proportioning |
| CN101058495A (en) * | 2007-05-25 | 2007-10-24 | 武永新 | Micro-slump concrete for roller compacted concrete dam and construction method thereof |
| CN101081527A (en) * | 2007-06-10 | 2007-12-05 | 王昱海 | Confecting method of modern concrete and the mixing proportion thereof |
Non-Patent Citations (1)
| Title |
|---|
| 《2001年度全国碾压混凝土技术交流会论文汇编》 20011231 周厚贵等 三峡工程左导墙碾压混凝土施工技术改进与实施 第141页第3行至第143页倒数第12行 1－5 , 2 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104261731A (en) * | 2014-07-08 | 2015-01-07 | 北京东方建宇混凝土科学技术研究院有限公司 | Design method for mix proportion of recycled aggregate concrete |
| CN106116317A (en) * | 2016-06-30 | 2016-11-16 | 中国水利水电第五工程局有限公司 | A kind of high-ductility concrete and the method controlling its mix performance |
| CN106116317B (en) * | 2016-06-30 | 2018-04-17 | 中国水利水电第五工程局有限公司 | A kind of high-ductility concrete and the method for controlling its mix performance |
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Open date: 20101201 |