CN105294005A - Mix proportion design method for improving bending tensile strength of road-used cement concrete - Google Patents
Mix proportion design method for improving bending tensile strength of road-used cement concrete Download PDFInfo
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- CN105294005A CN105294005A CN201510672154.XA CN201510672154A CN105294005A CN 105294005 A CN105294005 A CN 105294005A CN 201510672154 A CN201510672154 A CN 201510672154A CN 105294005 A CN105294005 A CN 105294005A
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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
-
- 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
-
- 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
Abstract
The invention discloses a mix proportion design method for improving the bending tensile strength of road-used cement concrete. According to the method, a conventional theory and method in which pressure-resisting concrete is continuously used are changed, a solid state inflowing theory and the design method for matching glue sand with gaps are presented according to the construction characteristics and the requirements for bending tensile strength indexes of the road-used concrete, the workable glue sand is significantly reduced, the conventional liquid state features of the concrete are changed into the solid state features, a 'buoyancy effect' is overcome, the strength of interface transition areas is enhanced, the bounding stress of stones and the glue sand is increased, more stones participate in strength contribution, and therefore the bending tensile strength is improved; the construction workability is met through flowing of the glue sand in the gaps of a coarse aggregate framework. According to the mix proportion design method, the advantages that the strength is high, cement is saved, construction is convenient, additives are saved are achieved, the durability of a cement concrete pavement can be significantly improved, and the higher economic benefit and social benefit are achieved.
Description
Technical field
The present invention relates to technical field of concrete, be specifically related to a kind of mixing proportion design method improving road cement concrete bending tensile strength.
Background technology
Along with the high speed development of Chinese national economy and highway transportation cause, there is the feature of " heavy duty, large discharge and canalized traffic " in transport by road, heavy goods vehicle and overloaded vehicle sharply rise, cause the sharply increase that actual accumulated standard axle is secondary, cause road surface premature failure, thus the structural strength of highway pavement and use properties are had higher requirement.Cement concrete pavement has the advantages such as rigidity is large, intensity is high, good stability, good endurance, long service life and maintenance costs are few.And along with the development of communication, domestic high-quality heavy traffic bitumen for road use becomes shortage gradually, and price rises steadily.Like this, cement concrete pavement is just in consequence further in overload highway.
It should be noted that the axle of many regional carrier vehicles is heavily far longer than the single shaft 100KN of national regulation, the limiting load standard of twin shaft 180KN, high capacity waggon and automobile overload define Heavy Traffic.Heavy Traffic be not merely somewhere, certain endemism economized, but nationwide, ubiquity.According to the investigation of some Importants such as Hebei, Henan, Shanxi, the overload ratio of more than 10 tons heavy goods vehicles is more than 40%, and some section reaches 80%, and extreme overload rate reaches 300%.So serious Heavy Traffic, the premature breakdown that cement concrete pavement is produced becomes more and more obvious, the road surface in many areas does not reach design life, the use initial stage namely there is fracture, purt mud, come to nothing, the damage such as faulting of slab ends, some section panel is even completely cracked, and service life of road surface is shortened greatly, and Pavement Condition decay is accelerated, maintenance costs constantly rises, and causes larger financial loss to society and freight department.As one of the principal passage of Shanxi coal transmission, the normal domestic section, (putting down) highway Jiaozhuo of Zheng (state), within 1991, be open to the traffic, 30 years lives, but open to traffic has been scarred less than 3 years, the half range road surface of particularly sending a car from direction, Shanxi, more so, vehicle is advanced quite difficult for disconnected plate, sinking, hole ditch.In the past few years, relevant department drops into this section maintenance cost and reaches more than 4,000 ten thousand yuan, exceedes the nearly half of construction investment.
Cement concrete pavement has stronger anti-heavily loaded ability, but to the susceptibility of excess load heavy duty far beyond bituminous pavement.Along with the increase that axle for vehicle carries, except the load stress making inside, concrete road surface produce increases, more cause actual accumulated standard axle to carry to be far longer than design axle to carry, make cement concrete pavement produce fatigue damage.Large-tonnage heavy duty probably causes the disposable limiting damage of cement concrete pavement in some cases, but not fatigure failure.On the route of super, heavily loaded large percentage, due to the standard axle load of actual load-carrying defined far beyond design and when building, even there is the phenomenon of " work as annual overhaul, the coming year is bad ".Heavy Traffic has become the external factor of the cement concrete pavement most critical of earlier period damage on a large scale.The direct result of cement concrete pavement fatigue damage is that the road surface traffic capacity reduces, maintenance capacity sharp increase, and maintenance difficult, maintenance cost are high.
China's Present Cement concrete road surface design courses, operating technique are considered not enough to Heavy Traffic, and China's transport power is nervous, national economy is badly in need of mass energy and is transported Energy Base in time, charging burden is towards heavy loading future development, as the transport by road of transportation of cargo important component part, be necessary to the research of heavily loaded traffic route.The research of Heavy Traffic road is many-sided, comprise top course, base material, structure design and constructional method, many mechanisms and scholar are studied Heavy Traffic cement concrete pavement and explore, but mostly concentrate on rear three aspects, also relatively less to the research of surface material.The behaviour in service of current concrete road surface shows, prevailing roadway concrete material is difficult to the needs meeting Heavy Traffic.High-strength, high performance concrete, has the feature of " high bending tensile strength ", " high-durability " and " excellent workability ", is widely used architectural, but investigation and application in road engineering especially road surface is also less.If for the cement concrete pavement under Heavy Traffic effect, not only can improve the ability that road surface opposing Heavy Traffic destroys, thinning road surface thickness can also be used for.
Meanwhile, along with country strengthens new countryside construction further, highway network construction and Country Road Construction have entered into the flourish new period.It is high that cement concrete pavement has supporting capacity, and anti-disaster ability is strong, and cost is low, and maintenance is easy, can make full use of the advantages such as local sandstone material, is more and more widely used in China's common road particularly road construction of village of counties and townships.Since 2005, Chuzhou City newly reconstruct with overhaul engineering in complete cement concrete pavement altogether more than 154 kilometers, rural highway more than 1380 kilometer substantially all adopts cement concrete pavement.Therefore, high bending tensile strength is researched and developed and high performance pavement concrete just seems very urgent with the requirement meeting cement concrete pavement development and has important practical significance.
Existing Cement Concrete Pavement Design bending tensile strength is generally 4.5-5MPa, for current heavy traffic, from weather resistance and working life, and safety margin relative deficiency.If bending tensile strength is brought up to 6-7MPa, safety margin will doubly bring up to 2-3.5 doubly from existing 1.5-2.When safety margin reaches more than 2 times, the design reference period requirement of more than 20 years can be reached, if there are more than 3 times, the requirement of the pavement usage Long Life Pavement of more than 30 years can be reached.
But there is following problem in current specifications:
In existing " highway cement concrete pavement construction technique normalizing JTGF30-2003 ", though pavement concrete is using bending tensile strength as an important technical indicator, proportioning has still continued to use the mentality of designing of compressed concrete, there is no obvious difference.
Compressed concrete is widely used in building, dam, bridge etc., and building shape and transport pumping for what ensure component, need overall flow, concrete is in a liquid state feature, and its workability is the important indicator weighing overall flow.
In concrete, glue sand body integration is for filling coarse aggregate space glue sand and workability glue sand, and workability glue sand refers in concrete except filling up coarse aggregate space, meets the glue sand needed for workability.The concrete of the characteristic that is in a liquid state, glue sand is filling up under the prerequisite of coarse aggregate space, must have abundant workability glue sand.In reality, workability glue sand body is long-pending generally long-pending slightly many than filling space glue sand body, and coarse aggregate is suspended in glue sand, to ensure its overall flow.
Coarse aggregate is suspended in glue sand, makes concrete after having vibrated, and before initial set, be in a liquid state characteristic.Because the proportion of water is the lightest, under gravity, gather materials and cement granules sinking, water is then inevitably to floating.Water, in floating-upward process, gathers materials if run into, and a part of water is just gathered in the bottom and side that gather materials, forms interfacial transition zone, causes glue sand to lose coarse aggregate bond stress, destroys coarse aggregate to the contribution of concrete tensile strength.This chain reaction caused because water molecules floats is referred to as " buoyant effect ".
Interfacial transition zone: refer to the region in aggregate Interface certain limit, the Structure and Properties in this region is different from petrifying water mudstone body.On microcosmic, there is the contact layer of one deck 1-3 micron at aggregate Interface place, and outside contact layer, have the early stage high pore layer of one deck about 5-10 micron, the reticulated structure of these porosity and looseness, defines interfacial transition zone.
Due to the interfacial transition zone that " buoyant effect " produces, directly affect the bond stress of glue sand to building stones, when concrete is subject to action of pulling stress, glue sand and building stones are easy to be peeling in interfacial transition zone, cause " contribution rate " of building stones participation bending tensile strength not high.Thus, the impact of interfacial transition zone on bending tensile strength is fatal.
We participate in intensity " contribution rate " by " specification " proportioning calculate glue sand, building stones, and in concrete, glue sand bending tensile strength is generally at 7-8MPa, gets intermediate value 7.5MPa.Account for 53% calculating by glue sand body in concrete is long-pending, then glue sand participates in concrete strength contribution at 4.0MPa, and the concrete tensile strength as configured is 5MPa, then building stones participate in intensity contribution is 1.0MPa, and building stones intensity " contribution rate " is only about 20%.
As can be seen here, cement concrete bending tensile strength produces " short-board effect " in interfacial transition zone.How to reduce interfacial transition zone, improve the bond stress of building stones and glue sand, allowing more building stones participate in intensity contribution is that we solve the key point of bending tensile strength.
By the cement concrete of current specifications preparation, due to " buoyant effect ", form interfacial transition zone, affect bending tensile strength.The terms of settlement of domestic and international routine adds water reducer, but add water reducer and can only improve glue sand self-strength in concrete, and then appropriateness improves concrete bending tensile strength, due to " buoyant effect " that do not have radical change to produce because of the feature that is in a liquid state, just quantitative change, there is no qualitative change, from the basic problem solving interfacial transition zone, therefore, bending tensile strength can not be improved limited, and cost is high, weak effect.
Because compressed concrete needs overall flow, the interfacial transition zone that " buoyant effect " produces is less on ultimate compression strength impact, and design theory is ripe, is widely used.But in the mix Design specification of existing road, continuing to use the interfacial transition zone that compressed concrete method of design produces, is fatal on the impact of bending tensile strength.
Directly pave on road surface during the concrete construction of road, technique is simple, and its overall flow is solved by modes such as machine spreading, like this, fresh concrete can become solid-state properties from liquid characteristic, to overcome " buoyant effect ", fundamentally strengthens the intensity of interfacial transition zone.For this reason, need according to the concrete construction characteristic in road and the requirement to bending tensile strength index, the Theories and methods that research road mix Design is new.
Summary of the invention
Goal of the invention: continue to use compressed concrete mixing proportion design theory and method to overcome prior art Road concrete, causes bending tensile strength to be difficult to improve, the present invention proposes the Theories and methods that the mix-design that meets road concrete feature is new.
Technical scheme: for solving the problem, improve road concrete tensile strength, must overcome " buoyant effect ", strengthen interfacial transition zone, workability glue sand is significantly reduced, change original liquid characteristic, make concrete be solid-state properties, in its workability glue sand effect principal security construction, coarse aggregate space can be full of completely.The present invention proposes the method for design that solid-state interior stream theory and glue sand and space match.
Solid-state interior stream is theoretical: the concrete newly mixed forms framework by coarse aggregate, presents solid-state properties, and the gravity of coarse aggregate passes to ground by framework, and the gravity not by coarse aggregate extrudes by the water be wrapped in inside glue sand, overcomes " buoyant effect " to reach.In order to ensure the workability vibrated, at the connectivity gap that coarse aggregate lower portion will provide enough glue sand flows dynamic, so that glue sand is in the unobstructed flowing of solid inner, guarantee to be easy to vibration compacting.
The method of design that glue sand and space match:
1, the basic consumption of shake porosity determination glue sand of coarse aggregate is filled;
2, the glue sand quantity of the thickness needs of surface abrasion layer;
3, the glue sand quantity that increases the slight interference space of coarse aggregate of fine aggregate, is directly proportional to fineness modulus.The glue sand body of above-mentioned predesigne amasss, then is joined by examination and determine, to reach the overall equilbrium of the solid-state and workability of concrete.
It is simple that technical problem to be solved by this invention is to provide a kind of method, is convenient to the method for the raising road cement concrete bending tensile strength of practical application.Technical problem to be solved by this invention realizes by the following technical solutions:
1) generally select 9.5mm-31.5mm (square hole sieve) to carry out rubble examination to join, by maximum By Measuring The Volume Density determination grating, record minimum shake porosity, determine coarse aggregate grating ratio;
2) according to design strength, unit cement consumption and water cement ratio is drafted;
3) according to shake porosity, thick, fine aggregate volume is calculated;
1. selected workability glue sand accounts for and fills jolt ramming space cement mortar rate example: rule of thumb, consider that surface abrasion layer thickness, fine aggregate are full of assurance coefficient three factors to the slight interference of coarse aggregate and glue sand, generally get about 40%.
2. calculate every side's glue sand body to amass
Every side's glue sand body is long-pending=(fill jolt ramming space glue sand body long-pending+workability glue sand body amasss)/(coarse aggregate volume+fillings jolt ramming space glue sand body long-pending+workability glue sand body is long-pending)
3. thick, fine aggregate volume is calculated
Every side's coarse aggregate volume=1-glue sand body amasss
Every side's fine aggregate volume=every side's glue sand body amasss-cement volume-volume of water
4) according to thick, fine aggregate density, every square thick, fine aggregate weight is calculated;
5) determine the preliminary proportioning of cement concrete, in conjunction with trial mix test and strength trial, finally draw the design mixture proportion meeting construction working and requirement of strength;
Design bending tensile strength is the concrete parameters scope of 5MPa: use the rubble of more than 9.5mm as coarse aggregate, the fineness modulus of sand is advisable with 2.7-3.0; Recommendation sand coarse aggregate ratio is 29-32%; Folk prescription concrete cement consumption is at 300-340kg/m
3; The folk prescription the reinforcement of concrete water yield is 130-150kg/m
3.
Described ballast grain sizes is 7.5mm-37.5mm.
Further, described ballast grain sizes is 9.5mm-31.5mm.
Preferably, workability glue sand body amass into fill space glue sand body long-pending 10 ~ 80% or 20 ~ 60%, particularly preferably 40%.
Coarse aggregate is rejected adopting the 4.75mm-9.5mm one-level of stage filling in former specification, its objective is to increase interstitial channels, reduces damping action, makes glue sand smooth and easy in space internal flow, be convenient to vibration compacting.In actually operating, grading limit can make the appropriate adjustments according to the fineness modulus of sand and raw material particle size difference.
The source existed by finding interfacial transition zone by, research finds that a set of solid-state interior stream is theoretical voluntarily, mixing proportion design method and the theory of existing road cement concrete bending tensile strength are thoroughly overturned, in order to ensure that rubble forms framework, do not produce buoyant effect, must ensure that the volume ratio of filling space glue sand and workability glue sand is more than 1, overcomes technology prejudice.Theoretical by solid-state interior stream, determine the minimum grain size that rubble is suitable, ensure the unobstructed flowing in rubble skeleton construction of glue sand, coordinate suitable filling space glue sand and the volume ratio of workability glue sand again, overcome the weak boundary zone of transition because rubble gravity sinks to producing, and the mobility of glue sand can be ensured, thoroughly eliminate weak interfacial transition zone.
Beneficial effect: the present invention in terms of existing technologies, has the following advantages:
1) intensity is improved.Owing to solving because " buoyant effect " forms weak this fundamental issue of interfacial transition zone, bending tensile strength comparatively conventional concrete improves more than 15%.
2) cement is saved.On the one hand, because more coarse aggregates participates in the contribution of concrete bulk strength, not single dependence sand glue intensity, more conventionally can save cement; On the other hand, because sand coarse aggregate ratio is relatively little, in concrete, glue sand total amount is more conventional few, thus indirect saving cement.
3) easy construction.Owing to overcoming " buoyant effect ", water cement ratio susceptibility declines obviously, and substantially without excreting water phenomenon in construction process, quality control is simple and convenient.
4) admixture is saved.Adopt the concrete tensile strength of novel mix-design, meet Ordinary Rd standard completely, and have certain more than needed; As added the admixture such as diminishing, air entrapment agent, bending tensile strength can also have certain lifting.
Accompanying drawing explanation
Fig. 1 is that pavement concrete aggregate of the present invention forms skeleton construction schematic diagram.
Fig. 2 is conventional pav aggregate internal dynamic schematic diagram.
Embodiment
Construction technology
Construction technology, compared with normal cement concrete, has two places slightly different, and one is, when adopting small equipment construction, need increase a mini-excavator and carry out mechanical material distributing; Two is need strengthen vibrating.When manually vibrating, generally by be no less than in every meter of width 1 specification be 75mm internal vibration rod lay, and vibrating time comparatively normal cement concrete road surface increase by more than 50%.Other construction technology and conventional cement concrete pavement indistinction.
Actual road test
According to shop experiment result of study, provincial highway 311 Dingyuan section overhaul engineering is relied on to do simultaneous test, within 2007 and 2008, constructed 5 kilometers respectively, road surface is wide 12 meters, concrete surface plate thickness 25cm, when personnel, equipment and the starting material place of production are all constant, within 2008, compared with 2007, only have adjusted proportioning, that is: cancel 4.75-9.5mm one-level coarse aggregate, sand coarse aggregate ratio reduces to 30% by 35%, reduces to 330 kilograms by 370 of cement consumption kilograms.After testing, although cement consumption reduces, bending tensile strength significantly improves.
Experiment Road starting material in 2008
Cement: adopt Chuzhou to produce pearl P.O42.5 class g cement, density is 3100kg/m
3;
Coarse aggregate: adopting Dingyuan to produce particle diameter is 9.5mm-31.5mm limestone gravel, and density is 2700kg/m
3;
Fine aggregate: adopt korneforos, pond, Mingguang City coarse sand, fineness modulus is 2.9, and density is 2650kg/m
3,
Mixing water: adopt general tap water.
The present embodiment mix-design step
1) select particle diameter to be 9.5mm-19mm and 19mm-31.5mm two kinds of grating coarse aggregates, according to maximum By Measuring The Volume Density, determine the grating of minimum shake porosity and bi-material.
Method: select the cylindric capacity bucket of 30L, by two kinds of coarse aggregates according to after the different ratios mixing such as 3:7,2:8,4:6, load capacity bucket, place shaking table vibratory compaction, recording 9.5mm-19mm and 19mm-31.5mm coarse aggregate optimum gradation corresponding under maximum unit weight is 28:72, and calculate minimum shake porosity is 39.2% simultaneously.
2) must not lower than 300kg/m according to regulation minimum cement (PO42.5 level) consumption in JTG/TF30-2014 " highway cement concrete pavement operating technique detailed rules and regulations "
3for radix, combining road design bending tensile strength 5.0MPa, preliminary selected cement consumption 320kg, water cement ratio gets conventional value 0.43, determines that unit consumption of water is 137.6 kilograms.
3) thick, fine aggregate volume is determined
1. selected workability glue sand accounts for and fills jolt ramming space cement mortar rate example: rule of thumb, consider that surface abrasion layer thickness, fine aggregate are full of assurance coefficient three factors to the slight interference of coarse aggregate and glue sand, generally get about 40%.
2. calculate every side's glue sand body to amass
In concrete, glue sand body is long-pending is made up of filling jolt ramming space glue sand and workability glue sand two portions.Wherein: filling jolt ramming space glue sand is equal with minimum shake porosity, is 39.2%; Workability glue sand accounts for fills 40% of jolt ramming space glue sand, by converting, show that in every side's concrete, glue sand body amasss.
Every side's glue sand body is long-pending=(fill jolt ramming space glue sand body long-pending+workability glue sand body amasss)/(coarse aggregate volume+fillings jolt ramming space glue sand body long-pending+workability glue sand body is long-pending)
Every side's glue sand body amasss=(39.2+39.2 × 40%)/(60.8+39.2+39.2 × 40%)
＝0.4744(m
3)
3. thick, fine aggregate volume is calculated
Every side's fine aggregate volume=every side's glue sand body amasss-cement volume-volume of water
＝0.4744-320/3100-137.6/1000＝0.2336(m
3)
Every side's coarse aggregate volume=1-glue sand body amasss=1-0.4744=0.5256 (m
3)
4) every square thick, fine aggregate weight is calculated
Every side's coarse aggregate weight=0.5256 × 2.7=1419kg;
Every side's fine aggregate weight=0.2336 × 2.65=619kg;
Sand coarse aggregate ratio=619/ (1419+619)=30.4%.
5) according to various material quantity ratio, adopt every side 310kg, 320kg, 330kg tri-kinds of different cement consumptions, through testing laboratory, concrete strength is joined in examination, all meets design requirement, and considers practice of construction, determines the cement consumption of every side 330kg.
6) in conjunction with on-the-spot trial mix, under the prerequisite meeting construction working, make the appropriate adjustments.
Table 12008 year novel mix-design table look-up
Within 2007, press the proportioning of current specifications construction, coarse aggregate is 4.75mm-31.5mm continuous grading, and as calculated, workability glue sand accounts for fills 125% of jolt ramming space glue sand.
Table 22007 year common mix-design table look-up
Within 2008, new proportioning is compared with 2007, and workability glue sand accounts for filling jolt ramming space glue sand and becomes 40% by original 125%, and fresh concrete becomes solid-state properties by liquid characteristic, thus improves concrete tensile strength.
Testing inspection data
Concrete tensile strength
Table 3 road is got core average intensity test-results and is gathered
Test result analysis
1. test-results shows, the average bending tensile strength of Novel cement concrete comparatively coventional type cement concrete improves 16.4%.
2. upper as can be seen from proportioning composition, Novel cement concrete comparatively coventional type cement concrete can save cement in a large number, and the more common proportioning of Experiment Road can save cement about 15%.
3. the ratio accounted for due to coarse aggregate in Novel cement concrete is large, and sand coarse aggregate ratio is less, and surface of aggregate is amassed little, concrete density is improved, concrete unit weight brings up to 2500-2550kg/m3 by 2400kg/m3, and its intensity is corresponding to be improved, highly beneficial to raising concrete durability.
4. because cement and water consumption make concrete slab drying shrinkage little less, the probability of road surface fine fisssure and disconnected plate can be reduced.
This project also carry out novelly to test with the cut resistance test of coventional type cement concrete, drying shrinkage, Standard Test Method for Permeation Resistance contrasts, result shows, novel comparatively coventional type cement concrete wear resistance, impermeability are all improved to some extent, and shrinkage performance comparatively coventional type cement concrete also has and improves very significantly.Actual road test
Road is tried out
1. Chuzhou City road network reconstruction project
Through shop experiment research and Experiment Road project quality inspection, prove Novel cement concrete mixing proportion design method proposed by the invention, can not only construction costs be reduced, and can also effectively improve cement-concrete road performance index.2008, implement the reconstruction of Chuzhou City road network, overhaul engineering 76.3 kilometers by above-mentioned mixing proportion design method, the results are shown in Table 4 for the concrete mix in main section, mechanical property test.
Table 4 Chuzhou City road network reconstruction project main section proportioning of cement concrete and mechanical property
After theoretical analysis and shop experiment, the achievement in research that the present invention obtains is tried out in Practical Project.
(1) provincial highway 311 Chu is relied on to determine road overhaul engineering making Experiment Road.Get core and test performance by on-the-spot sample preparation and entity project, contrast with common proportioning, demonstrate the concrete bending tensile strength of novel proportioning and obtain remarkable improvement.Detect the index such as intensity, planeness, construction depth of Experiment Road after operation for some time, the result display Experiment Road operational effect obtained is better.
(2) achievement of the present invention is tried out in Chuzhou City Road network analysis.Find that institute's making each bid section road surface operational effect is all better through tracing detection after a while.Thus prove novel mixing proportion design method proposed by the invention, can not only construction costs be reduced, and can also effectively improve cement-concrete road performance index.
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 by 370-380kg, and folk prescription concrete works cost declines about 15 yuan, amounts to and saves cement more than 9500 ton, saves engineering construction fund about 3,600,000 yuan.Carry out core detection to projects bending tensile strength, detected result shows, core intensity qualification rate 100%, and mean value is at more than 6.0MPa, and all core conversion bending tensile strengths are all higher than design strength 0.5MPa.
Meanwhile, the pavement concrete of this achievement in research preparation, can extend engineering work-ing life, thus reduces later period maintenance expense, and as extended 10-20, or reduce 1-2 time and keep in repair, its economic benefit is very remarkable.
The cement concrete pavement solid-state properties of constructing owing to adopting novel proportioning is obvious, and the slump is little, is more suitable for synovial membrane paver large-area construction.In addition, achievement of the present invention will have an impact to other engineering (as public works, factories and miness construction) and may be applied, and all will produce larger economic benefit.
Different ratios workability glue sand concrete intensity is in table 5:
Table 5 different ratios workability glue sand concrete strength trial table
More than show and describe ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and specification sheets just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (6)
1. improve a mixing proportion design method for road cement concrete bending tensile strength, it is characterized in that: its method comprises the following steps successively:
1) select particle diameter to be that 7.5mm-37.5mm rubble carries out examination and joins, by maximum By Measuring The Volume Density determination grating, record minimum shake porosity, determine coarse aggregate grating ratio;
2) according to design strength, unit cement consumption and water cement ratio is drafted;
3) according to shake porosity, determine the volume of filling space glue sand and workability glue sand, filling space glue sand is be filled into the glue sand in coarse aggregate jolt ramming space, workability glue sand body amass be no more than fill space glue sand body long-pending 80%; According to volumetric method determination sand coarse aggregate ratio;
4) determine the preliminary proportioning of cement concrete, in conjunction with trial mix test and strength trial, finally draw the design mixture proportion meeting construction working and requirement of strength.
2. the mixing proportion design method of raising road cement concrete bending tensile strength according to claim 1, is characterized in that: described ballast grain sizes is 7.5mm-37.5mm.
3. the mixing proportion design method of raising road cement concrete bending tensile strength according to claim 2, is characterized in that: described ballast grain sizes is 9.5mm-31.5mm.
4. the mixing proportion design method of raising road cement concrete bending tensile strength according to claim 1, is characterized in that: workability glue sand body amasss amass into filling space glue sand body 10 ~ 80%.
5. the mixing proportion design method of raising road cement concrete bending tensile strength according to claim 4, is characterized in that: workability glue sand body amasss amass into filling space glue sand body 20 ~ 60%.
6. the mixing proportion design method of raising road cement concrete bending tensile strength according to claim 1, it is characterized in that: design bending tensile strength is the concrete parameters scope of 5MPa: use the rubble of more than 9.5mm as coarse aggregate, the fineness modulus of sand is 2.7-3.1; Recommendation sand coarse aggregate ratio is 29-33%; Folk prescription concrete cement consumption is at 300-340kg/m
3; The folk prescription the reinforcement of concrete water yield is 130-150kg/m
3.
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| CN201510672154.XA Active CN105294005B (en) | 2014-11-18 | 2015-10-13 | A kind of mixing proportion design method for improving road cement concrete bending tensile strength |
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| CN201410658840.7A Pending CN104404850A (en) | 2014-11-18 | 2014-11-18 | Method for improving bending tensile strength and durability of cement concrete for road |
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| CN (2) | CN104404850A (en) |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN115536335A (en) * | 2022-09-27 | 2022-12-30 | 保利长大工程有限公司 | Porous concrete for road shoulder slip form construction and mix proportion design method thereof |
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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 |
| 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 |
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| 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 |
| CN113432978B (en) * | 2021-06-22 | 2024-02-06 | 郑州大学 | Microscopic analysis method for mechanical properties of high polymer material |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN104404850A (en) | 2015-03-11 |
| AU2015101897A4 (en) | 2017-07-20 |
| AU2015349248A1 (en) | 2017-06-22 |
| WO2016078522A1 (en) | 2016-05-26 |
| CN105294005B (en) | 2017-10-03 |
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