CN108101479A - A kind of lime based on small specimen, fine coal ash broken stones shrinkage performance test method - Google Patents
A kind of lime based on small specimen, fine coal ash broken stones shrinkage performance test method Download PDFInfo
- Publication number
- CN108101479A CN108101479A CN201711174736.0A CN201711174736A CN108101479A CN 108101479 A CN108101479 A CN 108101479A CN 201711174736 A CN201711174736 A CN 201711174736A CN 108101479 A CN108101479 A CN 108101479A
- Authority
- CN
- China
- Prior art keywords
- lime
- shrinkage
- specimen
- fine coal
- coal ash
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B28/02—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 containing hydraulic cements other than calcium sulfates
- C04B28/10—Lime cements or magnesium oxide cements
- C04B28/12—Hydraulic lime
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The present invention relates to a kind of lime based on small specimen, fine coal ash broken stones shrinkage performance test methods to belong to Transportation and Civil Engineering field, and this method key step includes：1）Determine lime, the optimum moisture content of fine coal ash broken stones and maximum dry density；2）Compact dimensions are the beam type small specimen of 50mm × 50mm × 210mm；3）After the test specimen of forming at the standard conditions health 6d, health 1d in 20 DEG C of water bath with thermostatic control is immersed；4）After surface moisture is dried, by 3 in 6 identical test specimens be placed on bearing with amesdial measure it is dry-shrinkage deformed, other 3 are put under the same conditions, weighs, is counted with average value at regular intervals.The major advantage of this method：（1）It is not susceptible to isolate during shaping test piece, the variability of test data is small；（2）Test specimen is not susceptible to damage when demoulding, and upper and lower ends face keeps complete；（3）Test specimen is not easy scaling-off when weighing, and data reliability is strong.
Description
Technical field
The invention belongs to Transportation and Civil Engineering fields, and in particular to a kind of lime based on small specimen, fine coal ash broken stones are done
Contracting performance test methods.
Background technology
Drying shrinkage refers to that semi-rigid sub-base material causes volume contraction phenomenon due to internal moisture changes.It is generally acknowledged that：Due to
Hydration inside evaporation and mixture, the moisture of mixture can be reduced constantly, and then capillarity, absorption is caused to be made
Being acted on etc. with, molecular separating force causes semi-rigid material to generate volume contraction.Check crack, cracking can be generated when dry-shrinkage deformed serious,
Can further it develop in crack later.Influence lime, the principal element of flyash drying shrinkage are the mineralogical composition of lime, flyash
With the fineness of lime, flyash.Among lime, flyash clinker, with C3A drying shrinkages are maximum, with C4AF drying shrinkages are minimum.
Cause capillary tension, the layer that the basic principle of drying shrinkage phenomenon occurs for the evaporation of water among lime, flyash stabilizing material
Between water, absorption water and molecular separating force and carbonization dehydration the effects that.Moisture reduction degree is bigger, and reduction speed is faster, generation
Drying shrinkage stress is bigger.
Southeast China University's traffic institute and Nanjin Airport Expressway administrative office are according to enough intensity, good cracking resistance
Principle has carried out the mix-design of Nanjin Airport Expressway lime-fly ash stabilized macadam, and using orthogonal test method to matching somebody with somebody
Major influence factors and drying shrinkage, the warm contracting characteristic of composition and division in a proportion design have carried out more comprehensive experimental study.Pass through point of result of the test
Analysis has drawn following conclusion:
1st, basis material (particle for being less than 5mm) rational content range in fly ash lime stabilized crushed rock mixture is 20%-
30%；
2nd, lime should use two level more than lime, and lime dosage is not preferably greater than 5%, and aggregate content should control left 82%
The right side, and strictly control below 5mm aggregate contents, especially below 2mm aggregate contents in fly ash lime stabilized crushed rock.
Tongji University and Shanghai Shanghai-Hangzhou highway commander army carry out mechanical property to the two-ash broken stones material of different gradation
It can have been drawn with dry-shrinkage tests as drawn a conclusion:
1st, the reduction of lime and fine aggregate content can cause the reduction of early anti pressured intension in mixture.
2nd, lime consumption increases, and maximal shrinkage strain and the maximum coefficient of shrinkage increase.
3rd, influence of the age to Dry Shrinkage Performance be:Increase with age, drying shrinkage strain and the coefficient of shrinkage reduce.
Qin Feng researchs rubber powder lime, the cracking resistance of flyash crushed rock base course, by forcing press be molded Φ 100mm ×
400mm cylinder test specimens, every group of test specimen 4, wherein 2 test specimens, for testing contraction distortion, 2 test specimens are used to test water content
Variation.Test increases the dry-shrinkage deformed and percentage of water loss of test specimen with exposure duration after test specimen demoulding health.
Chuzhou City Highway Administration of Anhui Province passes through the Analysis on Mechanism to two-ash broken stones draw, it is believed that:" more than needed " two ash is
Cause the basic reason of lime-fly ash aggregate base draw, solve the problems, such as draw, must just reduce " more than needed " two ash, make two ashes as far as possible
Ground, which is present in, to gather materials in frame；Stable frame can be preferably formed to make to gather materials, it should be gathered materials using gap gradation, to disconnect
5-10mm grain sizes are advisable, and below 5mm fine aggregates fill main aggregate gap；Two ash contents should be corresponding with the shake porosity that gathers materials,
The presence of " more than needed " two ash could be reduced, while ensures that two ashes are full of aggregate void.
Sun Zhaohui is also easy to produce desciccation crack this defect when humidity change for lime, flyash crushed rock base course, is unfolded
Correlation test research.Hydrostatic profile method is used to prepare cylinder test specimen of the size for Φ 150mm × 150mm, test specimen is from examination
It after deviating from mould and weighing, is wrapped up immediately with plastic film, drying shrinkage contrast test is carried out after health is complete.
Wang Yan inevitably leads to the problem of contraction fissure and has carried out experimental study for lime, flyash crushed rock base course,
Relation between the factors such as mixture shrinkage and percentage of water loss, temperature, lime, flyash dosage, grading, wherein dry shrinkage testing
It carries out at ambient temperature.Beam specimen is molded, size is 100mm × 100mm × 400mm, is strained on patch using 2 sheet resistances
Piece series winding uses, to improve test accuracy.Data acquisition is controlled by computer after on-test, while records containing with reference to test specimen
Water changes.
The content of the invention
It is existing in the prior art to solve the problems, such as, the deficiency of road engineering inorganic stabilizers material drying shrinkage test method is made up,
A kind of lime based on small specimen, fine coal ash broken stones shrinkage performance test method are provided, the survey tool that this method uses is thousand
Divide table, range 0-1mm, precision 0.001mm；Test specimen is molded using static pressure method, and compact dimensions are 50mm × 50mm × 210mm
Beam type small specimen.After the test specimen of forming at the standard conditions health 6d, health 1d in 20 DEG C of water bath with thermostatic control is immersed, it will
After surface moisture is dried, by 3 in 6 identical test specimens be placed on bearing with amesdial measure it is dry-shrinkage deformed, other 3 are put
Under the same conditions, weigh, counted with average value at regular intervals.Comprise the following steps according to sequencing：
Step 1：Determine that lime, flyash stationary level are matched somebody with somebody and optimum moisture content and maximum dry density, determine lime, fine coal
The dosage of ash；
Step 2：According to the ratio of fine aggregate in grading, lime, flyash in lime, fly-ash mortar test specimen are extrapolated
Dosage；
Step 3：The test specimen of forming health 6d at the standard conditions, is supported in the water bath with thermostatic control for immersing 20 DEG C in last 1 day
It is raw；
Step 4：After health is complete, as in drying shrinkage room after surface moisture is dried, 3 in 6 identical test specimens are put
It is dry-shrinkage deformed with amesdial measurement on bearing, other 3 are put under the same conditions, is weighed at regular intervals, with
Average value is counted.
Step 5：The strain of beam type small specimen drying shrinkage and the coefficient of shrinkage are calculated by the percentage of water loss that measures and shrinkage, and then
To evaluate lime, flyash stablizes the shrinkage performance of graded broken stone.
Specific embodiment
Below in conjunction with specific example, the present invention will be further described, but present disclosure be not limited solely to it is following
Embodiment.
Fly ash lime stabilized crushed rock is a kind of most common semi-rigid sub-base material, and material employed herein is waste and old base's material
Material, material include being derived from Beijing building stones factory and leave unused the waste and old fly ash lime stabilized crushed rock material and 0-5mm, 5-10mm and 10- of stacking
20mm third gear limestone virgin materials.Above-mentioned material is carried out in different ways according to related specifications to wash away abrasion test.
This method is mainly to limestone virgin material, water stability detritus old material fine aggregate, two-ash broken stones old material fine aggregate and lime, powder
Lime, the shrinkage performance of fly-ash mortar that coal ash, water mix are formed are evaluated.Entirety is mixed under mode, and design level is matched somebody with somebody
In lime, flyash dose lonvestion to lime, fine coal sand-lime of below the 4.75mm fine aggregate contents 40% or so, 3.5%
It is 13.75% in 5.5% lime, flyash dose lonvestion to lime, fly-ash mortar for 8.75% in slurry；In addition set
Lime, flyash stablize limestone virgin material as a control group.
Embodiment 1
The experiment of this group is integrally mixed under mode using two-ash broken stones old material fine aggregate, design level match somebody with somebody in below 4.75mm
Fine aggregate content is 8.75% in 40% or so, 3.5% lime, flyash dose lonvestion to lime, fly-ash mortar,
It is 13.75% in 5.5% lime, flyash dose lonvestion to lime, fly-ash mortar；According to maximum moisture content and maximum dry
Density shaping test piece measures drying shrinkage experimental result such as following table 1-1 after health is complete：
The dry shrinkage testing result of the grey old material mortars of table 1-1 bis-
It can be drawn by result, the coefficient of shrinkage of two grey old material mortars first increases again with the increase of lime, flyash dosage
Reduction increases again, and from the point of view of comprehensive drying shrinkage strain and the coefficient of shrinkage, 0-4.75mm fine aggregates use the regeneration stone of two-ash broken stones old material
Optimal lime that ash, fine coal ash broken stones are preferably selected, flyash dosage is 4.5% or so.
Embodiment 2
As a control group, the experiment of this group is using virgin material fine aggregate, integrally mixes under mode, design level match somebody with somebody in 4.75mm with
Lower fine aggregate content is 8.75% in 40% or so, 3.5% lime, flyash dose lonvestion to lime, fly-ash mortar,
It is 13.75% in 5.5% lime, flyash dose lonvestion to lime, fly-ash mortar；According to maximum moisture content and maximum dry
Density shaping test piece measures drying shrinkage experimental result such as following table 2-1 after health is complete：
The dry shrinkage testing result of table 2-1 virgin material mortars
It can be drawn by result, 0-4.75mm fine aggregates are preferably selected using lime, the fine coal ash broken stones of limestone virgin material
Optimal lime, flyash dosage are 3.5% or so.
Claims (7)
1. a kind of definite lime, the fine coal ash broken stones coefficient of shrinkage determine the mixture of method, it is characterised in that including following masses
Match ratio mixture.
2. a kind of lime based on small specimen, fine coal ash broken stones shrinkage performance test method, it is characterised in that including following specific
Step：
Step 1：It determines that lime, flyash stationary level are matched somebody with somebody and optimum moisture content and maximum dry density, determines lime, flyash
Dosage；
Step 2：According to the ratio of fine aggregate in grading, the agent of lime, flyash in lime, fly-ash mortar test specimen is extrapolated
Amount and water content；
Step 3：The test specimen of forming health 6d at the standard conditions, health in the water bath with thermostatic control for immersing 20 DEG C in last 1 day；
Step 4：After health is complete, as in drying shrinkage room after surface moisture is dried, 3 in 6 identical test specimens are placed on branch
It is dry-shrinkage deformed with amesdial measurement on seat, other 3 are put under the same conditions, is weighed at regular intervals, with average
Value is counted；
Step 5：The strain of cylinder specimen drying shrinkage and the coefficient of shrinkage are calculated by the percentage of water loss that measures and shrinkage, and then to comment
Valency lime, flyash stablize the shrinkage performance of graded broken stone.
3. a kind of lime based on small specimen, fine coal ash broken stones shrinkage performance test method as claimed in claim 2, feature
It is：In step 1, by《Highway road surface construction technology detailed rules and regulations》Recommended stage in JTG/T F20-2015, which is matched somebody with somebody, determines stone
Ash, the grading of fine coal ash broken stones utilize《Highway engineering stabilized with inorganic binder testing of materials regulation》JTG E51-2009 are inorganic
Binder stabilizing material compaction test method determines lime, fine coal ash broken stones optimum moisture content and maximum dry density, selected lime,
Flyash dosage.
4. a kind of lime based on small specimen, fine coal ash broken stones shrinkage performance test method as claimed in claim 2, feature
It is：In step 2, according to the ratio of fine aggregate in definite lime, flyash macadam gradating, shaping lime, fine coal are extrapolated
Lime, the dosage of flyash and water content in lime and brick test specimen.
5. a kind of lime based on small specimen, fine coal ash broken stones shrinkage performance test method as claimed in claim 2, feature
It is：In step 3, test specimen is made according to static pressure method, static pressure rate is 1mm/min, by the lime of forming, fly-ash mortar
It is put into standard curing box health after test specimen bagging, standard curing condition is T=20 DEG C, humidity >=95%.
6. a kind of lime based on small specimen, fine coal ash broken stones shrinkage performance test method as claimed in claim 2, feature
It is：In step 4, the range of amesdial is 0-1mm, and precision 0.001mm dries surface water after test specimen health is complete, as dry
Contracting room, drying shrinkage room temperature are 20 DEG C ± 1 DEG C, and relative humidity is 60% ± 5%, with stent that two dial holders are a certain in test specimen top surface
The both ends of diametrical position.
7. a kind of lime based on small specimen, fine coal ash broken stones shrinkage performance test method as claimed in claim 2, feature
It is：In step 5, through test the data that measure by《Highway engineering stabilized with inorganic binder testing of materials regulation》JTG E51—
2009 Chinese styles（T 0854-1）~ formula（T 0854-5）Processing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711174736.0A CN108101479A (en) | 2017-11-22 | 2017-11-22 | A kind of lime based on small specimen, fine coal ash broken stones shrinkage performance test method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711174736.0A CN108101479A (en) | 2017-11-22 | 2017-11-22 | A kind of lime based on small specimen, fine coal ash broken stones shrinkage performance test method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108101479A true CN108101479A (en) | 2018-06-01 |
Family
ID=62206827
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711174736.0A Pending CN108101479A (en) | 2017-11-22 | 2017-11-22 | A kind of lime based on small specimen, fine coal ash broken stones shrinkage performance test method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108101479A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106257267A (en) * | 2016-06-12 | 2016-12-28 | 北京建筑大学 | A kind of optimum moisture content using static pressure method and the determination method of maximum dry density |
| CN108254535A (en) * | 2017-11-21 | 2018-07-06 | 北京建筑大学 | It is a kind of to pass through fine aggregate evaluation lime, the method for flyash stabilization gravel shrinkage |
-
2017
- 2017-11-22 CN CN201711174736.0A patent/CN108101479A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106257267A (en) * | 2016-06-12 | 2016-12-28 | 北京建筑大学 | A kind of optimum moisture content using static pressure method and the determination method of maximum dry density |
| CN108254535A (en) * | 2017-11-21 | 2018-07-06 | 北京建筑大学 | It is a kind of to pass through fine aggregate evaluation lime, the method for flyash stabilization gravel shrinkage |
Non-Patent Citations (3)
| Title |
|---|
| 交通部公路科学研究院: "《公路工程无机结合料稳定材料试验规程》", 31 December 2009, 人民交通出版社 * |
| 汪京: "废旧基层材料水泥稳定再生利用技术研究", 《中国优秀硕士学位论文全文数据库》 * |
| 贾兴文等: "《土木工程材料》", 31 August 2017, 重庆大学出版社 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Zaetang et al. | Properties of pervious concrete containing recycled concrete block aggregate and recycled concrete aggregate | |
| Zhang et al. | Thermal conductivity of cement stabilized earth blocks | |
| Cartuxo et al. | Rheological behaviour of concrete made with fine recycled concrete aggregates–Influence of the superplasticizer | |
| Corinaldesi et al. | Characterization of self-compacting concretes prepared with different fibers and mineral additions | |
| Takhelmayum et al. | Laboratory study on soil stabilization using fly ash mixtures | |
| Bu et al. | Effect of sand content on strength and pore structure of cement mortar | |
| Ho et al. | Stress-strain behaviour of cement-stabilized Hong Kong marine deposits | |
| Deshpande et al. | Pore characterization of manufactured aggregates: recycled concrete aggregates and lightweight aggregates | |
| CN108646006B (en) | Method for determining cement stabilized macadam drying shrinkage coefficient | |
| CN108254535A (en) | It is a kind of to pass through fine aggregate evaluation lime, the method for flyash stabilization gravel shrinkage | |
| Paul et al. | Characterization of lightly stabilized granular base materials using monotonic and cyclic load flexural testing | |
| CN113984527A (en) | Method for calculating compressive strength of pervious concrete | |
| Cui et al. | Optimization and regulation of pavement concrete properties in plateau environment with large daily temperature difference: From mixture design to field application | |
| Kockal et al. | Effect of environmental conditions on the properties of concretes with different cement types | |
| Dai et al. | Experimental study on mechanical properties of permeable concrete | |
| CN108101479A (en) | A kind of lime based on small specimen, fine coal ash broken stones shrinkage performance test method | |
| CN107966383A (en) | A kind of cement stabilized macadam shrinkage performance test method based on small specimen | |
| Anya et al. | Effect of partial replacement of sand with quarry dust on the structural characteristics of sandcrete blocks | |
| Wang et al. | Influence of MB-value of manufactured sand on the shrinkage and cracking of high strength concrete | |
| Zhong et al. | Research on Impact Factors of Workability of Roller Compacted Concrete Based on Modified Vebe Test | |
| Skripkiūnas et al. | Variation of characteristics of vibropressed concrete pavement blocks | |
| Ugwuanyi et al. | Partial Replacement of Cement with Burnt Rice Husk Ash for Low Strength Concrete Production. | |
| Venkatraman et al. | hydration effect of Gum Arabic and guar gum powder on strength parameters of concrete | |
| Juhart et al. | Air permeability, water penetration and water absorption to specify durability of eco-efficient concrete | |
| Tioua et al. | Effect of hot-dry environment on fiber-reinforced self-compacting concrete |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180601 |