CN105294005B - A kind of mixing proportion design method for improving road cement concrete bending tensile strength - Google Patents
A kind of mixing proportion design method for improving road cement concrete bending tensile strength Download PDFInfo
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- CN105294005B CN105294005B CN201510672154.XA CN201510672154A CN105294005B CN 105294005 B CN105294005 B CN 105294005B CN 201510672154 A CN201510672154 A CN 201510672154A CN 105294005 B CN105294005 B CN 105294005B
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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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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/10—Coherent pavings made in situ made of road-metal and binders of road-metal and cement or like binders
- E01C7/14—Concrete paving
- E01C7/142—Mixtures or their components, e.g. aggregate
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/10—Coherent pavings made in situ made of road-metal and binders of road-metal and cement or like binders
- E01C7/14—Concrete paving
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Abstract
The invention discloses a kind of mixing proportion design method for improving road cement concrete bending tensile strength, change the conventional theory and method of continuing to use compressed concrete, requirement according to the construction characteristic of road concrete and to bending tensile strength index, propose the design method that stream theory and glue sand match with space in solid-state, so that workability glue sand is greatly decreased, it is solid-state properties by conventional liquid characteristic changing to make concrete, overcome " buoyancy effect ", strengthen the intensity of interfacial transition zone, improve the bond stress of building stones and glue sand, more building stones are allowed to participate in intensity contribution, so as to improve bending tensile strength, its workability constructed is met in the space internal flow of coarse aggregate skeleton by glue sand.There is high intensity, saving cement, easy construction, saving additive, the durability of cement concrete pavement can be significantly improved, economic benefit and social benefit are higher.
Description
Technical field
The present invention relates to technical field of concrete, and in particular to a kind of raising road cement concrete bending tensile strength is matched somebody with somebody
Composition and division in a proportion design method.
Background technology
With the high speed development of Chinese national economy and highway transportation cause, highway transportation occurs in that " heavy duty, big stream
The characteristics of amount and canalized traffic ", heavy goods vehicle and overloaded vehicle steeply rise, and cause the drastically increasing of actual accumulated standard axle time
Plus, cause road surface premature failure, thus higher requirement is proposed to the structural strength and performance of highway pavement.Cement is mixed
Solidifying soil surface has the advantages that rigidity is big, intensity is high, stability good, good endurance, service life length and maintenance costs are few.And with
The development of communication, domestic high-quality heavy traffic bitumen for road use gradually becomes shortage, and price rises steadily.So, cement is mixed
Solidifying soil surface is at consequence further in overload highway.
It is worth noting that, the axle of many regional haulage vehicles is far longer than single shaft 100KN, the twin shaft of national regulation again
180KN limiting load standard, high capacity waggon and automobile overload form Heavy Traffic.Heavy Traffic be not merely somewhere,
Some endemism saved, but it is nationwide, generality.According to the tune of some Importants such as Hebei, Henan, Shanxi
Look into, the overload ratio of more than 10 tons heavy goods vehicles is more than 40%, and some sections reach 80%, extreme overload rate is up to 300%.Such as
This serious Heavy Traffic, the premature breakdown for producing cement concrete pavement becomes more and more substantially, many regional road surfaces
Do not reach design life, using be initial stage occur fracture, purt mud, come to nothing, the damage such as faulting of slab ends, some section panels are even
Complete fragmentation, greatly shortens service life of road surface, and Pavement Condition decay is accelerated, and maintenance costs constantly rises, to society
And transportation department causes larger economic loss.One of main thoroughfare such as Shanxi coal transmission, normal (flat) the highway Jiaozhuo border of Zheng (state)
Interior section, is open to the traffic for 1991,30 years projected lives, but open to traffic was scarred less than 3 years, particularly from mountain
The half range road surface of west always car, more so, vehicle traveling is extremely difficult for the plate that breaks, sinkings, hole ditch.In the past few years, relevant department throws
Enter the section maintenance cost up to more than 4,000 ten thousand yuan, more than the nearly half of construction investment.
Cement concrete pavement has stronger anti-heavily loaded ability, but to the heavily loaded sensitiveness of excess load far beyond pitch
Road surface.The increase carried with axle for vehicle, except the load stress increase for making to produce inside concrete road surface, more causes actual accumulative
Standard axle load is far longer than design axle and carried, and cement concrete pavement is produced fatigue damage.Large-tonnage is heavily loaded very in some cases
It is likely to result in the disposable limiting damage of cement concrete pavement, rather than fatigue rupture.In the route of super, heavily loaded large percentage
On, due to the standard axle load of defined when actual load-carrying is far beyond design and build, or even occur in that " working as annual overhaul, the coming year is bad "
Phenomenon.Heavy Traffic has turned into the external factor of the most critical of a wide range of earlier period damage of cement concrete pavement.Coagulating cement
The direct result of soil surface fatigue damage is road surface traffic capacity reduction, maintenance capacity sharp increase, and maintenance difficult, maintenance cost
It is high.
China's Present Cement concrete road surface design courses, construction technology consider not enough to Heavy Traffic, and I
State's transport power is nervous, and national economy is badly in need of mass energy and transports Energy Base in time, and charging burden develops towards heavy loading direction,
As the highway transportation of cargo transport important component, the research to heavily loaded traffic route is necessary.Heavy Traffic
The research of road is many, including top course, base material, structure design and construction method, many mechanisms and scholar
Heavy Traffic cement concrete pavement is studied and explored, but mostly concentrates on rear three aspects, to surface material
Research is also relatively fewer.The behaviour in service of current concrete road surface shows that prevailing roadway concrete material is difficult to meet heavy duty to hand over
The need for logical.High-strength, high performance concrete, the characteristics of with " high bending tensile strength ", " high-durability " and " excellent workability ",
It has been widely used architectural, but the research and application in terms of road engineering especially road surface are also less.If being used for
The lower cement concrete pavement of Heavy Traffic effect, can not only improve the ability that road surface resistance Heavy Traffic is destroyed, can be with
For road surface thickness to be thinned.
Meanwhile, further strengthen new countryside construction with national, highway network construction and Country Road Construction are entered
The booming new period.Cement concrete pavement has bearing capacity high, and anti-disaster ability is strong, low cost, and maintenance is easy, can fill
The advantages of dividing using local sandstone material, is increasingly transported extensively in China's common road particularly highway construction of village of counties and townships
With.Since 2005, Chuzhou City is newly reconstructed and completes cement concrete pavement altogether more than 154 kilometers in overhaul engineering, and rural area is public
More than 1380 kilometers of road all uses cement concrete pavement substantially.Therefore, high bending tensile strength and high performance road surface are researched and developed
Requirement of the concrete to meet cement concrete pavement development just seems extremely urgent and had important practical significance.
Existing Cement Concrete Pavement Design bending tensile strength is generally 4.5-5MPa, for current heavy traffic, from
Durability and from the point of view of service life, safety stock relative deficiency.If bending tensile strength is brought up into 6-7MPa, safety stock will
2-3.5 times is brought up to from existing 1.5-2 times.When safety stock reaches more than 2 times, design reference period can be reached 20 years with
On requirement, if more than 3 times, be possible to reach the requirement of the pavement usage Long Life Pavement of more than 30 years.
But there is problems with current specifications：
It is existing《Highway cement concrete pavement construction technique normalizing JTG F30-2003》In, though pavement concrete is with bending resistance
Tensile strength is as an important technical indicator, but match ratio has still continued to use the mentality of designing of compressed concrete, has no obvious area
Not.
Compressed concrete is widely used in building, dam, bridge etc., pours shape and transport pumping for guarantee component, needs
Overall flow, concrete is in a liquid state feature, and its workability is the important indicator for weighing overall flow.
Glue sand body integration is filling coarse aggregate space glue sand and workability glue sand in concrete, and workability glue sand refers to coagulation
In soil in addition to coarse aggregate space is filled up, the glue sand needed for workability is met.The concrete for the characteristic that is in a liquid state, glue sand is filling up rough set
Under the premise of material space, it is necessary to have enough workability glue sand.In practice, workability glue sand body product is general than filling space glue sand
Volume is slightly more, and coarse aggregate is suspended in glue sand, to ensure its overall flow.
Coarse aggregate is suspended in glue sand, makes concrete after the completion of vibrating, and before initial set, be in a liquid state characteristic.Due to water
Proportion is most light, under gravity, gathers materials and cement granules sink, water is then inevitably to floating.Water in floating-upward process,
Gather materials if run into, a part of water collects on the bottom and side gathered materials, form interfacial transition zone, cause glue sand to coarse aggregate
Bond stress is lost, contribution of the destruction coarse aggregate to concrete tensile strength.It is this chain anti-because caused by floating hydrone
It should be referred to as " buoyancy effect ".
Interfacial transition zone：Refer to that, in a range of region of aggregate Interface, structure and the performance in this region are different from
Petrifying water mudstone body.There is one layer 1-3 microns of contact layer on microcosmic, at aggregate Interface, there is one layer of about 5- outside contact layer
10 microns of early stage high pore layers, the network structure of these porosity and looseness forms interfacial transition zone.
Due to " buoyancy effect " produce interfacial transition zone, directly affect bond stress of the glue sand to building stones, concrete by
During to action of pulling stress, glue sand and building stones are easy to be peeling in interfacial transition zone, cause building stones to participate in bending tensile strength
" contribution rate " be not high.Thus, influence of the interfacial transition zone to bending tensile strength is fatal.
We press《Specification》Match ratio participates in intensity " contribution rate " to glue sand, building stones and calculated, and glue sand resists in concrete
Flexural tensile strength is general in 7-8MPa, takes intermediate value 7.5MPa.53% calculating is accounted for by glue sand body product in concrete, then glue sand participates in coagulation
Native intensity contribution is in 4.0MPa, if the concrete tensile strength configured is 5MPa, then building stones participation intensity contribution is
1.0MPa, building stones intensity " contribution rate " is only 20% or so.
As can be seen here, cement concrete bending tensile strength produces " short -board effect " in interfacial transition zone.How interface is reduced
Transition region, improves the bond stress of building stones and glue sand, and it is that we solve bending tensile strength to allow more building stones to participate in intensity contribution
Key point.
The cement concrete prepared by current specifications, due to " buoyancy effect ", forms interfacial transition zone, influence bending resistance draws strong
Degree.Conventional solution is addition water reducer both at home and abroad, but addition water reducer can only improve glue sand self-strength in concrete,
And then appropriateness improves the bending tensile strength of concrete, due to " buoyancy effect " of no radical change because of the feature generation that is in a liquid state,
Simply quantitative change, can not be from the problem of solving interfacial transition zone at all without qualitative change, and therefore, raising bending tensile strength is limited, and
Cost is high, and effect is poor.
Because compressed concrete needs overall flow, the interfacial transition zone that " buoyancy effect " is produced influences on compression strength
Smaller, design theory is ripe, is widely used.However, being mixed on existing road with resistance to compression in mix Design specification, is continued to use
The interfacial transition zone that solidifying soil design method is produced, the influence to bending tensile strength is fatal.
Road during concrete construction on road surface with directly paving, and technique is simple, and its overall flow passes through machine spreading etc.
Mode is solved, so, and fresh concrete can be changed into solid-state properties from liquid characteristic, to overcome " buoyancy effect ", fundamentally
Strengthen the intensity of interfacial transition zone.For this reason, it may be necessary to be wanted according to the construction characteristic of road concrete and to bending tensile strength index
Ask, study road mix Design new theory and method.
The content of the invention
Goal of the invention：In order to overcome prior art Road to continue to use compressed concrete mixing proportion design theory and side with concrete
Method, causes bending tensile strength to be difficult to improve, and the present invention proposes the new theory of mix-design for meeting road concrete feature
And method.
Technical scheme：To solve the above problems, improving road concrete tensile strength, it is necessary to overcome " buoyancy effect ",
Strengthen interfacial transition zone, workability glue sand is greatly decreased, change original liquid characteristic, it is in solid-state properties to make concrete, its
Coarse aggregate space can be completely filled with the effect principal security construction of workability glue sand.The present invention proposes stream theory and glue in solid-state
The design method that sand matches with space.
Stream is theoretical in solid-state：The concrete newly mixed forms framework by coarse aggregate, and solid-state properties are presented, and the gravity of coarse aggregate leads to
Cross framework and pass to ground, be wrapped in the water inside glue sand and extrude the gravity not by coarse aggregate, " buoyancy effect is overcome to reach
Should ".In order to ensure the workability vibrated, to provide enough glue sand flows dynamic connectivity gap in coarse aggregate lower portion, so as to glue
Sand is in the unobstructed flowing of solid inner, it is ensured that be easy to vibration compacting.
The design method that glue sand matches with space：
1st, the shake porosity of filling coarse aggregate determines the basic consumption of glue sand；
2nd, the glue sand quantity that the thickness of surface abrasion layer needs；
3rd, fine aggregate is directly proportional to the increased glue sand quantity in slight interference space of coarse aggregate to modulus of fineness.It is above-mentioned first
The glue sand body product that step is calculated, then determined by trial, to reach the overall balance of concrete solid-state and workability.
The technical problems to be solved by the invention are to provide a kind of method simply, are easy to the raising road water of practical application
The method of cement concrete bending tensile strength.The technical problems to be solved by the invention are realized using following technical scheme：
1) rubble trial typically is carried out from 9.5mm-31.5mm (square hole screen), determines that level is matched somebody with somebody by maximum Measuring The Volume Density, measure
Minimum shake porosity, determines that coarse aggregate level matches somebody with somebody ratio；
2) according to design strength, unit cement consumption and the ratio of mud are drafted；
3) according to shake porosity, thick, fine aggregate volume is calculated；
1. select workability glue sand and account for filling jolt ramming space cement mortar rate example：Rule of thumb, it is contemplated that surface abrasion thickness degree,
Fine aggregate is full of three factors of assurance coefficient to the slight interference and glue sand of coarse aggregate, typically takes 40% or so.
2. calculate per square glue sand body product
Per side's glue sand body product=(filling jolt ramming space glue sand body product+workability glue sand body product)/(coarse aggregate volume+filling
Jolt ramming space glue sand body product+workability glue sand body product)
3. thick, fine aggregate volume is calculated
Per side's coarse aggregate volume=1- glue sand body product
Per side's fine aggregate volume=per square glue sand body product-cement volume-water volume
4) according to thick, fine aggregate density, thick, the fine aggregate weight per side is calculated；
5) determine that cement concrete is preliminarily mated ratio, with reference to trial mix experiment and strength test, finally draw satisfaction construction work
The design mixture proportion of the property made and intensity requirement；
Design the concrete parameters scope that bending tensile strength is 5MPa：Using more than 9.5mm rubble as coarse aggregate, sand
Modulus of fineness be advisable with 2.7-3.0；Recommendation sand coarse aggregate ratio is 29-32%；Folk prescription concrete cement consumption is in 300-340kg/m3；It is single
Square concrete water amount is 130-150kg/m3。
The ballast grain sizes are 7.5mm-37.5mm.
Further, the ballast grain sizes are 9.5mm-31.5mm.
It is preferred that, workability glue sand body product is the 10~80% or 20~60% of filling space glue sand body product, especially excellent
Select 40%.
Coarse aggregate rejects the 4.75mm-9.5mm one-levels in former specification using stage filling, and its purpose is to increase sky
Gap passage, reduces damping action, makes glue sand smooth in space internal flow, be easy to vibration compacting.In practical operation, grading limit
It can be made the appropriate adjustments according to the modulus of fineness and raw material particle size difference of sand.
By finding the source of interfacial transition zone presence by voluntarily research finds stream theory in a set of solid-state, thoroughly overturns
The mixing proportion design method and theory of existing road cement concrete bending tensile strength, in order to ensure rubble formation framework, are not produced
Capture stress effect, it is necessary to assure the volume ratio of filling space glue sand and workability glue sand overcomes technology prejudice more than 1.
It is theoretical by being flowed in solid-state, determine the suitable minimum grain size of rubble, it is ensured that the unobstructed flowing in rubble frame structure of glue sand, then match somebody with somebody
The volume ratio of suitable filling space glue sand and workability glue sand is closed, is overcome because of the weak boundary mistake that the sinking of rubble gravity is produced
Area is crossed, and can guarantee that the mobility of glue sand, weak interfacial transition zone is thoroughly eliminated.
Beneficial effect：The present invention in terms of existing technologies, with advantages below：
1) intensity is improved.Due to solving because of weak this fundamental issue of interfacial transition zone of " buoyancy effect " formation,
The more conventional concrete of bending tensile strength improves more than 15%.
2) cement is saved.On the one hand, it is not single dependence sand because more coarse aggregates participate in the contribution of concrete bulk strength
Glue intensity, it is more conventional to save cement；On the other hand, because sand coarse aggregate ratio is relatively small, glue sand total amount is more conventional few in concrete,
So as to indirect saving cement.
3) easy construction.Due to overcoming " buoyancy effect ", ratio of mud sensitiveness decline it is obvious, in work progress substantially without
Excreting water phenomenon, quality control is simple and convenient.
4) additive is saved.Using the concrete tensile strength of new mix-design, Ordinary Rd has been fully met
Design standard, and have certain more than needed；Diminishing, air entraining agent additive are such as added, bending tensile strength there can also be certain lifting.
Brief description of the drawings
Fig. 1 is pavement concrete aggregate of the present invention formation circuit theory schematic diagram.
Fig. 2 is conventional pav aggregate internal dynamic schematic diagram.
Embodiment
Construction technology
Construction technology has and is slightly different at two compared with normal cement concrete, and one is when using small equipment construction, to need
One mini-excavator of increase carries out mechanical material distributing；Two be that need to strengthen vibrating.When manually vibrating, typically by many in every meter of width
Laid in 1 specification for 75mm internal vibrations rod, and the more conventional cement concrete pavement increase by more than 50% of vibrating time.Its
Its construction technology and conventional cement concrete pavement indistinction.
Actual road test
According to laboratory test result of study, rely on the Dingyuan of provincial highway 311 section overhaul engineering to do contrast test, 2007 and
Construct respectively within 2008 5 kilometers, road surface is wide 12 meters, concrete surface plate thickness 25cm is equal in personnel, equipment and the raw material place of production
In the case of constant, compared with 2007, match ratio is only have adjusted, i.e., within 2008：Cancel 4.75-9.5mm one-level coarse aggregates, sand
Rate is reduced to 30% by 35%, and 330 kilograms are reduced to by 370 kilograms of cement consumption.After testing, although cement consumption is reduced, resist
Flexural tensile strength is but significantly improved.
Experiment Road raw material in 2008
Cement：Pearl P.O42.5 class g cements are produced using Chuzhou, density is 3100kg/m3；
Coarse aggregate：Dingyuan is used to produce particle diameter for 9.5mm -31.5mm limestone gravels, density is 2700kg/m3；
Fine aggregate：Using Mingguang City pond korneforos coarse sand, modulus of fineness is 2.9, and density is 2650kg/m3,
Mixing water：Using general drinking water.
The present embodiment mix-design step
1) it is that two kinds of levels of 9.5mm-19mm and 19mm-31.5mm match somebody with somebody coarse aggregate from particle diameter, according to maximum Measuring The Volume Density, it is determined that
The level of minimum shake porosity and two kinds of materials is matched somebody with somebody.
Method：From the cylindric capacity buckets of 30L, by two kinds of coarse aggregates according to 3:7、2:8、4:After the mixing of 6 grade different proportions,
Load capacity bucket, place shake table vibratory compaction, measure corresponding 9.5mm-19mm and 19mm-31.5mm rough sets under maximum unit weight
It is 28 to expect optimum gradation:72, while it is 39.2% to calculate minimum shake porosity.
2) according to JTG/TF30-2014《Highway cement concrete pavement construction technology detailed rules and regulations》The middle minimum cement of regulation
(PO42.5 grades) consumption must not be less than 300kg/m3For radix, combining road design bending tensile strength 5.0MPa tentatively selectes water
Mud consumption 320kg, the ratio of mud takes conventional value 0.43, and it is 137.6 kilograms to determine unit consumption of water.
3) thick, fine aggregate volume is determined
1. select workability glue sand and account for filling jolt ramming space cement mortar rate example：Rule of thumb, it is contemplated that surface abrasion thickness degree,
Fine aggregate is full of three factors of assurance coefficient to the slight interference and glue sand of coarse aggregate, typically takes 40% or so.
2. calculate per square glue sand body product
Glue sand body product is made up of filling jolt ramming space glue sand and workability glue sand two parts in concrete.Wherein：Filling is shaken
Occupied space gap glue sand is equal with minimum shake porosity, is 39.2%；Workability glue sand accounts for the 40% of filling jolt ramming space glue sand, leads to
Conversion is crossed, show that glue sand body is accumulated in every side's concrete.
Per side's glue sand body product=(filling jolt ramming space glue sand body product+workability glue sand body product)/(coarse aggregate volume+filling
Jolt ramming space glue sand body product+workability glue sand body product)
Per side's glue sand body product=(39.2+39.2 × 40%)/(60.8+39.2+39.2 × 40%)
=0.4744 (m3)
3. thick, fine aggregate volume is calculated
Per side's fine aggregate volume=per square glue sand body product-cement volume-water volume
=0.4744-320/3100-137.6/1000=0.2336 (m3)
Per side's coarse aggregate volume=1- glue sand body product=1-0.4744=0.5256 (m3)
4) thick, the fine aggregate weight per side is calculated
Per side coarse aggregate weight=0.5256 × 2.7=1419kg；
Per side fine aggregate weight=0.2336 × 2.65=619kg；
Sand coarse aggregate ratio=619/ (1419+619)=30.4%.
5) according to various material quantity ratios, using the different cement consumptions of every tri- kinds of side 310kg, 320kg, 330kg, through examination
Room trial concrete strength is tested, design requirement is satisfied by, it is considered to practice of construction, it is determined that the cement consumption per side 330kg.
6) live trial mix is combined, on the premise of construction working is met, is made the appropriate adjustments.
1 2008 years new mix-design lists of table
The match ratio constructed by current specifications for 2007, coarse aggregate is 4.75mm-31.5mm continuous gradings, is computed, work
The property made glue sand accounts for the 125% of filling jolt ramming space glue sand.
2 2007 years common mix-design lists of table
New match ratio in 2008 is compared with 2007, and workability glue sand accounts for filling jolt ramming space glue sand by original 125%
Become 40%, fresh concrete becomes solid-state properties by liquid characteristic, so as to improve concrete tensile strength.
Testing inspection data
Concrete tensile strength
The road coring mean intensity result of the test of table 3 collects
Test result analysis
1. result of the test shows, the average bending tensile strength of novel cement concrete is improved compared with plain edition cement concrete
16.4%.
2. as can be seen that novel cement concrete can largely save water compared with plain edition cement concrete from match ratio composition
Mud, the more common match ratio of Experiment Road can save cement 15% or so.
3. because the ratio that coarse aggregate is accounted in novel cement concrete is big, sand coarse aggregate ratio is smaller, and surface of aggregate product is small, makes concrete
Density is improved, and concrete unit weight brings up to 2500-2550kg/m3 by 2400kg/m3, and its intensity is accordingly carried
Height, it is highly beneficial to improving concrete durability.
4. because cement and water consumption make concrete slab drying shrinkage small less, the probability of road surface fine fisssure and disconnected plate can be reduced.
This project has also carried out new and plain edition cement concrete abrasion test, drying shrinkage experiment, Standard Test Method for Permeation Resistance
Contrasted, as a result shown, new to be improved to some extent compared with plain edition cement concrete wearability, impermeability, drying shrinkage
Performance also has significant improvement compared with plain edition cement concrete.Actual road test
Road is tried out
1. Chuzhou City road network reconstruction project
By laboratory test research and Experiment Road project quality inspection, it was demonstrated that novel cement concrete proposed by the invention coordinates
Than design method, construction costs can not only be reduced, but also can effectively improve cement-concrete road performance indications.2008
Year, implement the reconstruction of Chuzhou City road network, 76.3 kilometers of overhaul engineering, the concrete matched in main section by above-mentioned mixing proportion design method
The results are shown in Table 4 for composition and division in a proportion, mechanical property test.
The main section proportioning of cement concrete of Chuzhou City road network reconstruction project of table 4 and mechanical property
After theory analysis and laboratory test, the achievement in research obtained by the present invention is tried in Practical Project
With.
(1) Chu of provincial highway 311 is relied on to determine road overhaul engineering making Experiment Road.By live sample preparation and entity project coring and survey
Performance is tried, is compareed with common match ratio, the bending tensile strength for demonstrating new match ratio concrete is significantly improved.To fortune
The index such as the intensity of Experiment Road, flatness, construction depth is detected after row a period of time, and obtained result shows Experiment Road fortune
Seek effect preferable.
(2) achievement of the present invention is tried out in Chuzhou City Road network analysis.Through tracing detection hair after a while
Each bid section road surface operational effect of existing institute's making is relatively better.So as to prove new mix-design side proposed by the invention
Method, can not only reduce construction costs, but also can effectively improve cement-concrete road performance indications.
Economic and Efficiency Analysis
2008, the reconstruction of Chuzhou City road network, overhaul engineering amounted to 8 cement concrete pavement projects, total kilometrage 76.3km.
Compared with similar projects in 2007, folk prescription concrete cement consumption is reduced to 330kg, folk prescription concrete works by 370-380kg
Cost declines 15 yuan or so, and the ton of cement more than 9500 is saved altogether, saves about 3,600,000 yuan of engineering construction fund.To projects bending resistance
Tensile strength carries out core detection, and testing result shows, core sample intensity qualification rate 100%, and average value is in more than 6.0MPa, Suo Youxin
Sample converts bending tensile strength all higher than design strength 0.5MPa.
Meanwhile, the pavement concrete that this achievement in research is prepared can extend engineering service life, so as to reduce later period maintenance expense
With, such as extension 10-20, or reduce by 1-2 maintenance, its economic benefit is very notable.
Because the cement concrete pavement solid-state properties constructed using new match ratio are obvious, the slump is small, is more suitable for
In synovial membrane paver large-area construction.In addition, achievement of the present invention will produce shadow to other engineerings (such as municipal works, factories and miness construction)
Ring and be likely to be obtained application, will all produce bigger economic benefit.
Different proportion workability glue sand concrete intensity is shown in Table 5：
The different proportion workability glue sand concrete strength test table of table 5
The general principle and principal character and advantages of the present invention of the present invention has been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the simply explanation described in above-described embodiment and specification is originally
The principle of invention, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (5)
1. a kind of mixing proportion design method for improving road cement concrete bending tensile strength, it is characterised in that：Its method is successively
Comprise the following steps：
1）It is that the mm of 7.5 mm -37.5 rubbles carry out trial from particle diameter, determines that level is matched somebody with somebody by maximum Measuring The Volume Density, measure minimum and shake
Real voidage, determines that coarse aggregate level matches somebody with somebody ratio, forms framework by coarse aggregate, solid-state properties are presented, it is ensured that glue sand is in rubble framework
Unobstructed flowing in structure；
2) according to design strength, unit cement consumption and the ratio of mud are drafted；
3）According to shake porosity, it is determined that the volume of filling space glue sand and workability glue sand, filling space glue sand is to be filled into
Glue sand in coarse aggregate jolt ramming space, coarse aggregate space can be completely filled with the effect principal security construction of workability glue sand, be worked
Property glue sand body product no more than the 80% of filling space glue sand body product；Sand coarse aggregate ratio is determined according to volumetric method；
4）Determine that cement concrete is preliminarily mated ratio, with reference to trial mix experiment and strength test, finally draw and meet construction working
With the design mixture proportion of intensity requirement.
2. the mixing proportion design method of the raising road cement concrete bending tensile strength according to claim 1, it is special
Levy and be：The ballast grain sizes are 9.5mm-31.5mm.
3. the mixing proportion design method of the raising road cement concrete bending tensile strength according to claim 1, it is special
Levy and be：Workability glue sand body product is the 10 ~ 80% of filling space glue sand body product.
4. the mixing proportion design method according to claim 3 for improving road cement concrete bending tensile strength, its feature
It is：Workability glue sand body product is the 20 ~ 60% of filling space glue sand body product.
5. the mixing proportion design method of the raising road cement concrete bending tensile strength according to claim 1, it is special
Levy and be：Design the concrete parameters scope that bending tensile strength is 5MPa：Rubble using more than 9.5mm is as thick
Gather materials, the modulus of fineness of sand is 2.7-3.1；Recommendation sand coarse aggregate ratio is 29-33%；Folk prescription concrete cement consumption is in 300-340kg/
m3；Folk prescription concrete water amount is 130-150kg/m3。
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| CN106769392B (en) * | 2016-11-24 | 2019-06-25 | 南京理工大学 | Test steel bridge deck and epoxy asphalt mixture are mated formation the method for interface cracking resistance |
| CN108691255A (en) * | 2017-04-07 | 2018-10-23 | 上海宝冶集团有限公司 | Rural highway concrete road construction method |
| CN108708244B (en) * | 2018-06-22 | 2023-03-17 | 杜宇 | Highway pavement base without cracks and preparation method thereof |
| CN109267442A (en) * | 2018-10-17 | 2019-01-25 | 吴江市建设工程质量检测中心有限公司 | The proportion design method of vibration moulding graded broken stone |
| CN109711634B (en) * | 2018-12-29 | 2020-09-18 | 浙江大学 | Method for designing mix proportion of regenerated water permeable bricks based on target water permeability coefficient |
| CN111505251A (en) * | 2019-01-30 | 2020-08-07 | 南京交通职业技术学院 | Method for predicting strength of cement concrete |
| CN110453579B (en) * | 2019-09-09 | 2021-05-18 | 济南通达公路工程有限公司 | Super-curing seal construction method for cement concrete pavement |
| CN113250028A (en) * | 2021-04-25 | 2021-08-13 | 广州大学 | Construction method of alkali slag concrete pavement |
| CN113432978B (en) * | 2021-06-22 | 2024-02-06 | 郑州大学 | Microscopic analysis method for mechanical properties of high polymer material |
| CN113420478B (en) * | 2021-06-22 | 2022-11-01 | 郑州大学 | Method for analyzing mechanical property of high polymer crushed stone based on microscopic structure characteristics |
| CN115536335B (en) * | 2022-09-27 | 2023-06-27 | 保利长大工程有限公司 | Porous concrete for road shoulder slip form construction and mix proportion design method thereof |
| CN117309661B (en) * | 2023-11-28 | 2024-02-23 | 睢宁县泰宁建材有限公司 | Concrete quality on-line measuring system |
| CN117805156B (en) * | 2024-02-27 | 2024-05-10 | 太原理工大学 | Method for testing hydration degree of interface transition zone between repair material and base material |
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| CN101653967A (en) * | 2009-09-17 | 2010-02-24 | 长安大学 | Crack resistance type cement stabilized macadam proportioning design method based on vibration test method |
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| CN103182742A (en) * | 2012-06-10 | 2013-07-03 | 王昱海 | High dense pavement base preparation method, proportioning ratio, and sieve with pore size scale not less than 2.4143 |
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| CN103613344B (en) * | 2013-12-05 | 2015-08-12 | 攀枝花环业冶金渣开发有限责任公司 | The method of design of high-titanium dry slag concrete and proportioning thereof |
| CN103951320B (en) * | 2014-04-16 | 2015-09-09 | 长安大学 | A kind of mixing proportion design method of sea-water mud of retaining wall stable performance |
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