WO2016078522A1 - 一种提高路用水泥混凝土抗弯拉强度的配合比设计方法 - Google Patents
一种提高路用水泥混凝土抗弯拉强度的配合比设计方法 Download PDFInfo
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- WO2016078522A1 WO2016078522A1 PCT/CN2015/094283 CN2015094283W WO2016078522A1 WO 2016078522 A1 WO2016078522 A1 WO 2016078522A1 CN 2015094283 W CN2015094283 W CN 2015094283W WO 2016078522 A1 WO2016078522 A1 WO 2016078522A1
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- ratio
- concrete
- mortar
- cement
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Classifications
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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
Definitions
- the invention relates to the technical field of concrete, in particular to a mixing ratio design method for improving the bending and tensile strength of road cement concrete.
- cement concrete pavement has the advantages of high rigidity, high strength, good stability, good durability, long service life and low maintenance cost.
- Cement concrete pavement has strong anti-heavy load capacity, but its sensitivity to overload and heavy load far exceeds asphalt pavement.
- the actual accumulated standard axle load is much larger than the designed axle load, which causes fatigue damage on the cement concrete pavement.
- heavy tonnage heavy loads are likely to cause one-time ultimate damage to cement concrete pavements rather than fatigue damage.
- the actual load exceeds the standard axle load specified in the design and construction, and even the phenomenon of “repairing in the current year and bad in the coming year” has appeared.
- Heavy-duty traffic has become the most critical external factor for large-scale early damage to cement concrete pavements. The direct consequence of fatigue damage of cement concrete pavement is that the pavement capacity is reduced, the maintenance volume is sharply increased, and the maintenance is difficult and the maintenance cost is high.
- High-strength, high-performance concrete with the characteristics of “high bending strength”, “high durability” and “excellent workability” has been widely used in construction, but research and application in road engineering, especially road surface. Still less. If it is used for cement concrete pavement under heavy traffic, it can not only improve the road's ability to resist heavy traffic damage, but also reduce the thickness of the pavement.
- cement concrete pavement has the advantages of high carrying capacity, strong disaster resistance, low cost, simple maintenance, and full utilization of local sand and gravel materials. It is widely used in the construction of ordinary roads in China, especially in rural roads. Since 2005, the cement concrete pavement has completed more than 154 kilometers in the new reconstruction and overhaul projects in Chenzhou City, and cement concrete pavements have been basically used in rural roads over 1,380 kilometers. Therefore, it is extremely urgent and important to study and develop high-resistance tensile strength and high-performance pavement concrete to meet the requirements of cement concrete pavement development.
- the existing cement concrete pavement design has a flexural tensile strength of 4.5-5 MPa.
- the safety reserve is relatively insufficient in terms of durability and service life. If the bending strength can be increased to 6-7 MPa, the safety reserve will be increased from the existing 1.5-2 times to 2-3.5 times.
- the design base period can be more than 20 years. If it is more than 3 times, it will be able to reach the long-life road surface with the road surface used for more than 30 years.
- Compressive concrete is widely used in buildings, dams, bridges, etc. In order to ensure the pouring shape and transportation of the components, the whole flow is required, and the concrete is liquid. The workability is an important indicator to measure the overall fluidity.
- the volume of the rubber in the concrete is divided into the coarse aggregate voids and the working mortar.
- the working mortar refers to the rubber sand required to meet the workability except for filling the coarse aggregate voids.
- the mortar For concrete with liquid properties, the mortar must have enough working mortar to fill the gap of the coarse aggregate.
- the working mortar In practice, the working mortar is generally slightly larger than the filled void mortar, and the coarse aggregate is suspended in the mortar to ensure its overall fluidity.
- the coarse aggregate is suspended in the rubber sand, so that the concrete has a liquid characteristic after the vibration is completed and before the initial setting. Because the proportion of water is the lightest, under the action of gravity, the aggregate and cement particles sink, and the water will inevitably float upward. In the process of floating in the water, if the aggregate is encountered, a part of the water will accumulate at the bottom and the side of the aggregate, forming an interface transition zone, causing the loss of the grip strength of the coarse aggregate, and destroying the coarse aggregate to resist the bending of the concrete. The contribution of strength. This chain reaction caused by the floating of water molecules is called the "buoyancy effect.”
- Interface transition zone refers to the area within a certain range of the aggregate interface. The structure and performance of this zone is different from that of the hardened cement stone body. Microscopically, there is a layer of 1-3 micron contact layer at the aggregate interface, and a layer of early 5-10 micron high porosity layer outside the contact layer. These porous and loose network structures form an interfacial transition zone.
- the interface transition zone directly affects the binding force of the sand to the stone.
- the rubber sand and the stone material are easily peeled off at the interface transition zone, and the "contribution rate" of the stone material participating in the bending strength is not high.
- the effect of the interface transition zone against the bending strength is fatal.
- the ratio of contribution to the strength of contribution of mortar and stone is measured.
- the tensile strength of concrete in concrete is generally 7-8MPa, taking a median value of 7.5MPa. According to the 53% of the volume of the rubber in the concrete, the contribution of the sand to the concrete strength is 4.0 MPa. If the tensile strength of the concrete is 5 MPa, the contribution of the stone is 1.0 MPa, and the contribution rate of the stone is “contribution rate”. Only around 20%.
- Cement concrete prepared according to the current specifications due to the "buoyancy effect", forms an interface transition zone, which affects the bending strength.
- the conventional solution at home and abroad is to add a water reducing agent, but adding a water reducing agent can only improve the strength of the rubber sand in the concrete, and then moderately increase the bending strength of the concrete, because there is no fundamental change in the buoyancy effect due to the liquid characteristics. "It is only a quantitative change, there is no qualitative change, and it cannot solve the problem of the transition zone of the interface fundamentally. Therefore, the bending strength is increased, the cost is high, and the effect is poor.
- Road concrete is paved directly on the road during construction.
- the process is simple, and its overall fluidity is solved by mechanical paving.
- the fresh concrete can change from liquid to solid to overcome the “buoyancy effect”. Enhance the strength of the interface transition zone.
- it is necessary to study the new theory and method of road concrete mix ratio design according to the construction characteristics of road concrete and the requirements of resistance to bending strength.
- Solid-state internal flow theory fresh concrete forms a frame from coarse aggregates and exhibits solid-state characteristics.
- the gravity of the coarse aggregate is transmitted to the ground through the frame, and the water wrapped in the rubber sand will not be squeezed by the gravity of the coarse aggregate. Achieve overcoming the "buoyancy effect.”
- a sufficient gap of adhesive sand flow is provided inside the coarse aggregate frame so that the grit can flow smoothly inside the solid state, ensuring easy vibrating and compacting.
- the vibrating void ratio of the coarse aggregate is determined to determine the basic amount of the mortar
- the slight interference of the fine aggregate to the coarse aggregate increases the amount of the sand, which is proportional to the fineness modulus.
- the above-mentioned preliminary calculated grit volume is determined by trial matching to achieve a comprehensive balance of concrete solidity and workability.
- the technical problem to be solved by the present invention is to provide a method for improving the bending strength of road cement concrete by using a simple method and being convenient for practical application.
- the technical problem to be solved by the present invention is implemented by the following technical solutions:
- Each square of mortar volume (filled vibrating void mortar volume + working mortar volume) / (coarse aggregate volume + filled vibrating void mortar volume + working mortar volume)
- Each aggregate coarse aggregate volume 1 - mortar volume
- Fine aggregate volume per square volume of each mortar - cement volume - water volume
- Design parameters of concrete with bending strength of 5 MPa use coarse stone of 9.5 mm or more as coarse aggregate, sand fineness modulus is 2.7-3.0; recommended sand rate is 29-32%; single concrete cement dosage At 300-340 kg/m 3 ; the water consumption of the single concrete is 130-150 kg/m 3 .
- the crushed stone has a particle size of 7.5 mm to 37.5 mm.
- the crushed stone has a particle diameter of 9.5 mm to 31.5 mm.
- the working grit volume is from 10 to 80% or from 20 to 60%, particularly preferably 40%, of the volume of the void-filled grit.
- the coarse aggregate is removed from the 4.75mm-9.5mm level in the original specification.
- the purpose is to increase the gap passage and reduce the damping effect, so that the sand flows smoothly inside the gap and is easy to vibrate and compact.
- the grading range can be appropriately adjusted according to the fineness modulus of the sand and the particle size of the raw material.
- the present invention has the following advantages over the prior art:
- FIG. 1 is a schematic view showing the structure of a pavement concrete aggregate forming frame according to the present invention.
- Figure 2 is a schematic diagram of the internal dynamics of a conventional pavement concrete aggregate.
- Coarse aggregate The limestone crushed stone with a diameter of 9.5mm-31.5mm is used, and the density is 2700kg/m 3 ;
- Fine aggregate using coarse sand in Mingguangchi River, the fineness modulus is 2.9, and the density is 2650kg/m 3 .
- the minimum cement (PO42.5 grade) should not be less than 300kg/m 3 as the base, combined with the pavement design bending strength 5.0MPa, preliminary selection
- the amount of cement is 320kg
- the water-cement ratio is 0.43
- the unit water consumption is 137.6kg.
- the volume of the mortar in the concrete consists of two parts: filled with vibrating voids and working mortar. Among them: the filled vibrating void mortar is equal to the minimum vibrating void ratio, which is 39.2%; the working colloid accounts for 40% of the filled vibrating colloidal sand, and the volume of the colloid in each concrete is obtained by conversion.
- Each square of mortar volume (filled vibrating void mortar volume + working mortar volume) / (coarse aggregate volume + filled vibrating void mortar volume + working mortar volume)
- Fine aggregate volume per square volume of each mortar - cement volume - water volume
- the coarse aggregate was 4.75mm-31.5mm continuous grading.
- the working rubber sand accounted for 125% of the filled vibrating sand.
- the concrete slab Due to the small amount of cement and water, the concrete slab has a small shrinkage, which can reduce the probability of micro-cracking and broken boards.
- the project also carried out a comparison of the wear resistance test, dry shrinkage test and impermeability test of new and common cement concrete.
- the results show that the wear resistance and impermeability of the new type of cement concrete are improved to some extent.
- the dry shrinkage performance is also significantly improved compared to ordinary cement concrete.
- the pavement concrete prepared by the research results can extend the service life of the project, thereby reducing the maintenance cost in the later period. For example, the extension of 10-20 years, or the reduction of 1-2 repairs, the economic benefits are very significant.
- the slump is small, which is more suitable for large-area construction of the slipper paver.
- the results of the present invention will have an impact on other projects (such as municipal engineering, plant and mine construction) and may be applied, and will produce greater economic benefits.
Abstract
Description
Claims (6)
- 一种提高路用水泥混凝土抗弯拉强度的配合比设计方法,其特征在于:其方法依次包括以下步骤:1)选用粒径为7.5mm—37.5mm碎石进行试配,由最大容重法确定级配,测得最小振实空隙率,确定粗集料级配比例;2)根据设计强度,拟定单位水泥用量及水灰比;3)根据振实空隙率,确定填充空隙胶砂和工作性胶砂的体积,填充空隙胶砂是填充到粗集料振实空隙中的胶砂,工作性胶砂体积不超过填充空隙胶砂体积的80%;按照体积法确定砂率;4)确定水泥混凝土初步配合比,结合试拌试验和强度试验,最后得出满足施工工作性和强度要求的设计配合比。
- 根据权利要求1所述的提高路用水泥混凝土抗弯拉强度的配合比设计方法,其特征在于:所述碎石粒径为7.5mm-37.5mm。
- 根据权利要求2所述的提高路用水泥混凝土抗弯拉强度的配合比设计方法,其特征在于:所述碎石粒径为9.5mm-31.5mm。
- 根据权利要求1所述的提高路用水泥混凝土抗弯拉强度的配合比设计方法,其特征在于:工作性胶砂体积为填充空隙胶砂体积的10~80%。
- 根据权利要求4所述的提高路用水泥混凝土抗弯拉强度的配合比设计方法,其特征在于:工作性胶砂体积为填充空隙胶砂体积的20~60%。
- 根据权利要求1所述的提高路用水泥混凝土抗弯拉强度的配合比设计方法,其特征在于:设计抗弯拉强度为5MPa的混凝土参数范围:使用9.5mm以上的碎石作为粗集料,砂的细度模数为2.7-3.1;推荐砂率为29-33%;单方混凝土水泥用量在300-340kg/m3;单方混凝土用水量为130-150kg/m3。
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AU2015349248A AU2015349248A1 (en) | 2014-11-18 | 2015-11-11 | Ratio design method for increasing anti-stretching strength of pavement cement concrete |
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CN201410658840.7 | 2014-11-18 | ||
CN201410658840.7A CN104404850A (zh) | 2014-11-18 | 2014-11-18 | 一种提高路用水泥混凝土抗弯拉强度和耐久性的方法 |
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- 2015-11-11 WO PCT/CN2015/094283 patent/WO2016078522A1/zh active Application Filing
- 2015-11-11 AU AU2015101897A patent/AU2015101897A4/en not_active Ceased
- 2015-11-11 AU AU2015349248A patent/AU2015349248A1/en active Pending
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JP2009191509A (ja) * | 2008-02-14 | 2009-08-27 | Fujita Corp | 大気浄化機能を有する舗装の施工方法 |
US20130108364A1 (en) * | 2011-10-26 | 2013-05-02 | Barth Campbell | Method and material for paving a surface |
CN103526664A (zh) * | 2013-10-30 | 2014-01-22 | 江苏宝利沥青股份有限公司 | 一种适用于重载交通路面的沥青混合料配合比的确定方法 |
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CN108708244B (zh) * | 2018-06-22 | 2023-03-17 | 杜宇 | 一种不产生裂纹的公路路面基层及其制备方法 |
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CN105294005B (zh) | 2017-10-03 |
CN104404850A (zh) | 2015-03-11 |
AU2015349248A1 (en) | 2017-06-22 |
CN105294005A (zh) | 2016-02-03 |
AU2015101897A4 (en) | 2017-07-20 |
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