CN110055846B - Cement stabilized macadam base and construction method thereof - Google Patents
Cement stabilized macadam base and construction method thereof Download PDFInfo
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- CN110055846B CN110055846B CN201910416771.1A CN201910416771A CN110055846B CN 110055846 B CN110055846 B CN 110055846B CN 201910416771 A CN201910416771 A CN 201910416771A CN 110055846 B CN110055846 B CN 110055846B
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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
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
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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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
- C04B41/81—Coating or impregnation
- C04B41/85—Coating or impregnation with inorganic materials
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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
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
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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
- E01C3/00—Foundations for pavings
- E01C3/06—Methods or arrangements for protecting foundations from destructive influences of moisture, frost or vibration
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Road Paving Structures (AREA)
Abstract
The invention relates to the technical field of highway pavement laying, in particular to a cement stabilized macadam base which is formed by mixing and constructing the following components in parts by weight: 78-87 parts of coarse aggregate, 5-13 parts of fine aggregate, 4-9 parts of high belite cement, 0.2-0.8 part of calcium sulphoaluminate-calcium oxide composite expanding agent and 5-15 parts of water, wherein a waterproof reinforcing agent is sprayed on the surface layer of the cement stabilized macadam foundation layer, and the waterproof reinforcing agent is prepared from the following raw materials in percentage by weight: 1-3% of fatty acid waterproof agent, 50-70% of styrene-acrylic emulsion, 15-30% of asbestos powder and 10-25% of water; the mechanical strength of the constructed base course is improved, the average temperature shrinkage coefficient and the average drying shrinkage coefficient are both reduced, and the comprehensive performance is improved.
Description
Technical Field
The invention relates to the technical field of highway pavement laying, in particular to a cement stabilized macadam base and a construction method thereof.
Background
The cement stabilized macadam takes graded macadam as aggregate, adopts a certain amount of cementing materials and enough mortar volume to fill the gap of the aggregate, and is paved and compacted according to the embedding and extruding principle. The compactness of the mortar is close to the compactness, the strength mainly depends on the embedding, extruding and locking principles among the gravels, and simultaneously, the mortar has enough volume to fill the gaps of the aggregate. Its initial strength is high, and its strength can be quickly increased with age, and can be quickly formed into plate body, so that it has high strength, and good impermeability and frost resistance. After the cement stabilized macadam survives, the macadam does not get muddy when meeting rain, has a solid surface, and is an ideal base material for high-grade pavements.
The cement stabilized macadam base layer belongs to a semi-rigid structure layer, has good mechanical property and is easy to pave and construct. However, after the semi-rigid base layer is constructed, the semi-rigid base layer is exposed for a long time before the asphalt pavement is paved, and the temperature stress generated by the external day temperature difference repeatedly acts, so that the temperature stress is combined with the dry shrinkage stress of the base layer, and the semi-rigid base layer is easy to crack. The longer the time, the larger the crack, and after the asphalt layer is laid on the base layer, the crack of the base layer gradually extends upwards to the asphalt surface layer or gradually extends downwards, so that the crack which is connected up and down, namely the reflection crack, is formed. The initial reflection crack only affects the road surface beauty, reduces the flatness and has no obvious influence on the driving. However, when water exists on the road surface, the water can permeate into the asphalt surface layer and the base layer along the reflection cracks, and under the external factors of high-speed driving load above the road surface, the water in the cracks can continuously impact the binder in the base layer under the load pressure, so that the binder such as cement, soil and the like in the base layer is greatly reduced, and only aggregates such as broken stones and the like are left, thereby forming a hollow structure on the road surface, greatly reducing the strength and shortening the service cycle of the road.
One of the internal reasons for the generation of the water-stable base cracks is whether the grading and the mixing proportion of the aggregates are proper, and the strength of the base layer is affected by excessive coarse aggregates or fine aggregates, so that the variation coefficient of the deflection value is large, the suspension coefficient is large, the uniformity is poor, the strength of the concentrated part of the coarse aggregates is high, the strength of the concentrated part of the fine aggregates is low, the internal stress of the base layer is unbalanced, and the generation of the shrinkage cracks is caused. Another internal cause of cracks in the water-stable base course is the amount of cement mixed, and when the amount of cement mixed exceeds 5%, the shrinkage coefficient of the base course gradually increases, thereby aggravating the cracks of the base course. Therefore, in the prior art, in order to avoid serious cracking of the base layer, the cement mixing amount is reduced and controlled to be 3-5%. However, cement can enhance the strength and stability of the water-stable base course, and limiting the cement content to 5% can relatively reduce the rigidity of the base course.
In conclusion, the requirement on the rigidity of the water-stable base can be met, and the shrinkage cracks can be reduced, so that the service life of the road is prolonged.
Disclosure of Invention
Aiming at the defects in the prior art, the first object of the invention is to provide a cement stabilized macadam foundation, which improves the mechanical strength of the foundation and reduces the temperature shrinkage coefficient and the dry shrinkage coefficient.
The first purpose of the invention is realized by the following technical scheme:
the cement stabilized macadam base is formed by mixing the following components in parts by weight: 78-87 parts of coarse aggregate, 5-13 parts of fine aggregate, 4-9 parts of high belite cement, 0.2-0.8 part of calcium sulphoaluminate-calcium oxide composite expanding agent and 5-15 parts of water, wherein a waterproof reinforcing agent is sprayed on the surface layer of the cement stabilized macadam foundation layer, and the waterproof reinforcing agent is prepared from the following raw materials in percentage by weight: 1-3% of fatty acid waterproof agent, 50-70% of styrene-acrylic emulsion, 15-30% of asbestos powder and 10-25% of water.
By adopting the technical scheme, the high belite cement, HBC for short, belongs to the Portland cement series as common cement. However, the dicalcium silicate in the high belite cement accounts for about 90% of the total, far exceeds the content of tricalcium silicate, and the content of calcium oxide is very small and far lower than 5% specified by the state. Therefore, the high belite cement has slow hydration, small heat of hydration, good hydration resistance and low self shrinkage. The high belite cement is applied to the water-stable base layer, so that the cement amount of hydration reaction in a plastic stage can be effectively reduced, and the effective expansion energy of the water-stable base layer is improved by matching with the calcium sulphoaluminate-calcium oxide composite expanding agent, so that the compensation shrinkage capacity of the base layer is improved, and the shrinkage cracks of the base layer can be reduced. The waterproof reinforcing agent is sprayed on the surface layer of the cement stabilized base layer, so that the surface layer of the cement stabilized base layer is not completely exposed in the maintenance period before the asphalt surface layer is laid, and the influence of the external environment on the base layer can be reduced; on the other hand, the waterproof reinforcing agent can gradually permeate into the base layer, and the waterproof reinforcing agent is mixed with the high belite cement and the fine aggregate in the base layer to realize the anti-capillary effect, so that the special effects of water resistance, hydrophobicity, impermeability, leakage prevention and the like are achieved, and the asbestos powder in the waterproof reinforcing agent can cover the surface of the base layer to form a hardening protective layer, so that the rigidity of the surface of the base layer is improved. According to the invention, the calcium sulphoaluminate-calcium oxide composite expanding agent is added into the base layer, and the surface of the base layer is subjected to waterproof treatment, so that the cement mixing amount can be relatively increased and the strength of the base layer can be improved on the premise of reducing the base layer shrinkage cracks.
Preferably, the paint is prepared by mixing the following components in parts by weight: 80-85 parts of coarse aggregate, 7-10 parts of fine aggregate, 5-8 parts of high belite cement, 0.4-0.6 part of calcium sulphoaluminate-calcium oxide composite expanding agent and 8-12 parts of water, wherein a waterproof reinforcing agent is sprayed on the surface layer of the cement stabilized macadam foundation layer, and the waterproof reinforcing agent is prepared from the following raw materials in percentage by weight: 1.5-2.5% of fatty acid waterproof agent, 55-60% of styrene-acrylic emulsion, 20-25% of asbestos powder and 15-20% of water.
By adopting the technical scheme, the content of the components is optimized, and the comprehensive performance of the base layer is further improved.
Preferably, the coarse aggregate is limestone macadam processed by a two-stage impact crusher or a hammer crusher, the crushing value of the limestone macadam is less than or equal to 26%, the content of needle sheets is less than or equal to 15%, the content of dust with the particle size of less than 0.075mm is less than or equal to 1.2%, and the content of soft stone is less than or equal to 3%; the fine aggregate is natural sand.
Preferably, the gradation range of the mixture formed by mixing the coarse aggregate and the fine aggregate is as follows: 100wt% through a 31.5mm square mesh sieve, 95-100wt% through a 26.5mm square mesh sieve, 75-85wt% through a 19.0mm square mesh sieve, 66-77wt% through a 16.0mm square mesh sieve, 46-58wt% through a 9.5mm square mesh sieve, 28-38wt% through a 4.75mm square mesh sieve, 20-28wt% through a 2.36mm square mesh sieve, 11-19wt% through a 1.18mm square mesh sieve, 8-15wt% through a 0.6mm square mesh sieve, 5-11wt% through a 0.3mm square mesh sieve, 3-8wt% through a 0.15mm square mesh sieve, and 0-5wt% through a 0.075mm square mesh sieve.
By adopting the technical scheme, the impurity content of the coarse aggregate is qualified, and the crushed stone has good particle shape, so that the shape of the crushed stone is close to a cube. The grading of coarse and fine aggregates is controlled, which is more favorable for the dispersion uniformity of the coarse aggregates and the fine aggregates in the base layer, thereby avoiding overlarge or undersize local strength, ensuring uniform internal stress of the base layer and reducing the shrinkage force of the base layer.
Preferably, the weight percentage of the mixture passing through a 0.075mm square hole sieve is 3-5%.
By adopting the technical scheme, the fatigue resistance of the cement stabilized macadam is improved.
Preferably, the asbestos powder is serpentine asbestos powder, and the length of the asbestos powder is 100-200 mu m.
By adopting the technical scheme, the serpentine asbestos powder, namely the warm stone powder, has a fibrous space structure, can provide skeleton support for the waterproof reinforcing agent, is favorable for forming a hardening protective layer on the surface layer of the base layer, and improves the waterproof protection effect on the base layer.
The second purpose of the invention is to provide a construction method of the cement-stabilized macadam foundation, which is constructed by the following steps:
(1) uniformly mixing the coarse aggregate, the fine aggregate, the high belite cement, the calcium sulphoaluminate-calcium oxide composite expanding agent and water to obtain a mixture;
(2) paving the mixture in the step (1) at a position to be paved, and rolling and compacting to form a base layer;
(3) maintaining the base layer obtained in the step (2), spraying the waterproof reinforcing agent on the surface of the base layer for 2-3 times during maintenance, and uniformly covering the waterproof reinforcing agent on the surface layer of the base layer; and obtaining the cement stabilized macadam base after curing.
Through adopting above-mentioned technical scheme, in the maintenance period after the completion is laid to the basic unit, the interval sprays waterproof reinforcing agent, can play the waterproof and guard action of continuation to the basic unit, avoids the basic unit directly to expose, both can reduce the fracture influence that external environment caused to the basic unit, can improve the waterproof ability of basic unit self again to improve the intensity of basic unit, prolong the life cycle of road.
Preferably, in the step (2), two spreading machines are used for trapezoidal staggered spreading in sequence, the two spreading machines are spaced by 5-8m from each other in front and back, and are spread forwards simultaneously, and are overlapped by 200mm in transverse direction, wherein the distance between the two spreading machines is 100 mm.
Preferably, in the step (2), a road roller is used for rolling, the positions folded back from the two ends at each time are pushed forwards along with the paver in a stepped manner, and the folded parts are not in the same cross section.
By adopting the technical scheme, the compactness and the compaction uniformity of the base layer are ensured, the strength of each part in the base layer is uniform, the phenomenon that the internal stress is uneven due to overlarge or undersize local strength is avoided, and the shrinkage stress of the base layer can be reduced.
In conclusion, the invention has the following beneficial effects:
(1) the surface of the base layer is treated by the waterproof reinforcing agent, so that the water seepage prevention capability of the base layer is improved, and the water quantity entering the base layer from the reflection cracks is reduced, so that the dry cracking resistance and strength of the base layer are improved, and the service cycle of a road is prolonged;
(2) the high belite cement is selected and combined with the calcium sulphoaluminate-calcium oxide composite expanding agent, so that the self-compensating shrinkage capacity of the base layer can be improved, and cracking is avoided;
(3) through the batching of basic unit self, combine the waterproof enhancement processing on top layer, make the basic unit satisfy the prerequisite of rigidity requirement under, reduce the shrinkage fracture.
Detailed Description
The present invention will be further described with reference to the following specific examples.
The initial setting time of the high belite cement is 4.8 hours, the final setting time is 8.5 hours, the number of days of discharging the high belite cement when the high belite cement enters a field and enters a tank is 1 day, so the high belite cement is stored for 7 days and is used after the stability is qualified, and the temperature of the high belite cement in bulk entering the tank is controlled within 50 ℃. The chemical analysis data of the calcium sulphoaluminate-calcium oxide composite expanding agent provided by the invention are as follows: loss on ignition of 2.10%, SO3 19.72％，SiO2 2.00％，Fe2O3 1.19％，Al2O34.39%, CaO68.62%, MgO1.74%, f-CaO47.72%. The fatty acid water repellent is selected from Zhengzhou Longda waterproof materials Co. The styrene-acrylic emulsion is selected from BC-01 styrene-acrylic emulsion of Shandongboda new material Co. The asbestos powder is serpentine asbestos powder with the length of 100-200 mu m. The coarse aggregate is limestone macadam processed by a two-stage impact type or hammer type crusher. The fine aggregate is natural sand.
The waterproof reinforcing agent adopts a conventional preparation method of a building waterproof agent, and specifically comprises the following steps: mixing the fatty acid waterproof agent, the asbestos powder and the water according to the mixing amount in the table 1, stirring for 50min at the rotating speed of 80r/min, then adding the styrene-acrylic emulsion, and stirring for 60min at the rotating speed of 120r/min to obtain the waterproof agent.
Example 1
A cement stabilized macadam base is constructed by the following steps:
(1) mixing 78kg of coarse aggregate, 5kg of fine aggregate, 4kg of high belite cement, 0.2kg of calcium sulphoaluminate-calcium oxide composite expanding agent and 5kg of water uniformly to obtain a mixture; wherein the crushing value of the limestone macadam is 26%, the needle sheet content is 15%, the dust content below 0.075mm is 1.2%, and the soft stone content is 3%; the gradation range of the mixture formed by mixing the coarse aggregate and the fine aggregate is as follows: 100wt% through a 31.5mm square mesh screen, 96.8 wt% through a 26.5mm square mesh screen, 79.0 wt% through a 19.0mm square mesh screen, 64.6 wt% through a 16.0mm square mesh screen, 52.9 wt% through a 9.5mm square mesh screen, 32.3 wt% through a 4.75mm square mesh screen, 21.3 wt% through a 2.36mm square mesh screen, 15.2 wt% through a 1.18mm square mesh screen, 9.4 wt% through a 0.6mm square mesh screen, 6.8 wt% through a 0.3mm square mesh screen, 5.2 wt% through a 0.15mm square mesh screen, 0wt% through a 0.075mm square mesh screen;
(2) before paving, arranging datum lines on two sides of a position to be paved, and controlling the paving elevation; two covering belt type pavers with the performance not lower than that of the Fugler 2100 type are adopted for paving in a trapezoidal staggered arrangement from the front to the back, the two pavers are separated by 5m from each other at the front and the back, and are paved forwards at the same time and are transversely overlapped by 100 mm; unloading by a three-time unloading method by using a dump truck; the paver keeps the travelling speed of 2m/min to travel at a constant speed, and the speed cannot be changed in the midway; when more mixture is adhered in the hopper during paving, the hopper is collected, and a full-load material conveying vehicle is immediately connected to feed materials into the paver after the hopper is collected; carrying out rolling operation before the initial setting of the laid mixture, which specifically comprises the following steps: rolling by using a vibratory roller with the exciting force not less than 50t and a roller with the self weight of 35t, wherein the rolling follows the principle of 'light weight first and heavy weight first, weak strength first and strong strength first, slow speed first and fast speed first, edge first and middle first', and the road shoulders and the joints on the two sides are pressed for 3 times; the position of the road roller folded from two ends is stepped each time, and the road roller is pushed forward along with the paver, so that the folded position is inclined at an angle of 45 degrees; the vibrating wheel is overlapped 1/3 wheel width, and the rear wheel exceeds the joint of the two sections; one time is taken when the rear wheel presses the full width of the road surface; the rolling speed of the road roller is 2km/h for the first two times, and is 2.5km/h for the subsequent times; after compaction, detecting the flatness section by using a 6m ruler, and obtaining a base layer after the flatness is qualified;
(3) after the base layer is paved and compacted, the waterproof reinforcing agent is sprayed on the surface of the base layer for 1 time, and the weight is 1.5kg/m2The spraying amount of the waterproof reinforcing agent enables the waterproof reinforcing agent to uniformly cover the surface layer of the base layer; then, maintaining by adopting permeable geotextile, overlapping two geotextiles by 25cm, and then pressing edges by using stones; the maintenance period is 10 days, and water is sprayed to the surface of the geotextile at intervals by a watering cart during the maintenance period, so that the surface of the geotextile is kept wet all the time; maintaining for the fourth day, removing the geotextile, and spraying the waterproof reinforcing agent on the surface of the base layer for 1 time again to uniformly cover the waterproof reinforcing agent on the surface layer of the base layer; then covering a permeable geotextile for maintenance, overlapping two geotextiles by 25cm, and then pressing the edges by using stones; and curing for 6 days to obtain the cement stabilized macadam base.
Example 2
The construction operation of example 2 differs from that of example 1 in that: in the step (2), the two spreading machines are spaced by 8m from each other in the front-back direction, and are spread forwards simultaneously, and are overlapped by 200mm in the transverse direction, and the rest is the same as that in the embodiment 1.
Example 3
Example 3 the same as example 1 construction operation steps, the difference is that the raw materials are added according to the mixture ratio in table 1, and the crushed value of the limestone macadam is 25%, the needle-shaped content is 15%, the dust content below 0.075mm is 1.0%, and the soft stone content is 2.8%; the gradation range of the mixture formed by mixing the coarse aggregate and the fine aggregate is as follows: 100wt% through a 31.5mm square mesh screen, 95 wt% through a 26.5mm square mesh screen, 85wt% through a 19.0mm square mesh screen, 77wt% through a 16.0mm square mesh screen, 58wt% through a 9.5mm square mesh screen, 28wt% through a 4.75mm square mesh screen, 20 wt% through a 2.36mm square mesh screen, 11wt% through a 1.18mm square mesh screen, 8wt% through a 0.6mm square mesh screen, 5wt% through a 0.3mm square mesh screen, 3 wt% through a 0.15mm square mesh screen, 3 wt% through a 0.075mm square mesh screen; the rest corresponds to example 1.
Example 4
Example 4 is the same as the construction operation procedure of example 1, except that the raw materials are added according to the mixture ratio in table 1, and the gradation range of the mixture formed by mixing the coarse aggregate and the fine aggregate is as follows: 100wt% through a 31.5mm square mesh screen, 100wt% through a 26.5mm square mesh screen, 75 wt% through a 19.0mm square mesh screen, 66 wt% through a 16.0mm square mesh screen, 46 wt% through a 9.5mm square mesh screen, 38wt% through a 4.75mm square mesh screen, 28wt% through a 2.36mm square mesh screen, 19wt% through a 1.18mm square mesh screen, 15wt% through a 0.6mm square mesh screen, 11wt% through a 0.3mm square mesh screen, 8wt% through a 0.15mm square mesh screen, 5wt% through a 0.075mm square mesh screen; the rest corresponds to example 1.
Examples 5 to 7
Examples 5-7 were carried out in the same manner as in example 1 except that the respective raw materials were added in the amounts shown in Table 1.
It should be noted that the water-stable base material prepared in the above embodiments is mainly used to express the overall process and raw material proportioning relationship. In actual construction, the consumption of each raw material can be correspondingly enlarged in the proportion of the invention according to the quantity of the base material required on site so as to meet different road condition requirements.
In table 1, the units of the respective raw materials are kg, water 1 is water added to the cement stabilized macadam base, and water 2 is water added to the waterproof reinforcing agent.
TABLE 1 content of each raw material (unit kg) of examples 1 to 7
Comparative example 1
Comparative example 1 differs from example 5 in that the surface layer of the water-stable base layer is not treated with a water-repellent reinforcing agent, and the rest corresponds to example 5.
Comparative example 2
Comparative example 2 differs from example 5 in that high belite cement was replaced with ordinary portland cement in the cement-stabilized base course material, and the remainder was identical to example 5.
Comparative example 3
Comparative example 3 is different from example 5 in that the cement-based base raw material does not contain the calcium sulfoaluminate-calcium oxide composite swelling agent, and the rest is identical to example 5.
Comparative example 4
Comparative example 4 is the semi-rigid substrate of example 1 of the inventive patent application having application publication No. CN 109336476 a.
Performance testing
The maximum dry density and optimum moisture content of each of the substrates of examples 1-7 and comparative examples 1-4 were tested using the test method of T0804-. The test pieces with the specifications defined in T0843-. The test pieces of the specification defined in T0844-. Testing the fatigue performance of the water-stable base layer mixture by adopting an American MTS810 material fatigue testing machine, wherein the test piece forming method adopts vibration forming, the vibration frequency is 30Hz, and the static pressure is 150 kPa; the curing time is 3 months, the curing temperature is 25 ℃, and the humidity is 90%; the test load waveform is sine wave, the loading frequency is 100Hz, the length of the test piece is 30cm, the stress level is 0.7, a three-point loading mode is adopted, and the number of times of repeated loading is tested, namely the fatigue life. The test results for each item are shown in table 2.
Table 2 results of performance testing of different substrates
The test results in table 2 show that the rigidity and the dry shrinkage cracking resistance of the water-stable base layer of the invention are superior to those of the semi-rigid base layer material in the prior art (comparative example 4): the unconfined compressive strength in 7 days is improved by nearly 12 percent, the cleavage strength in 7 days is improved by nearly 33 percent, the average temperature shrinkage coefficient is reduced by 16 percent, and the average drying shrinkage coefficient is reduced by nearly 12 percent. The results of comparative example 1 prove that the waterproof reinforcing agent of the invention has an influence on the rigidity and the dry shrinkage cracking resistance of the base layer of the invention, and if the waterproof reinforcing agent is not treated, the compressive strength and the cracking strength of the base layer are reduced, the average temperature shrinkage coefficient and the average dry shrinkage coefficient are also reduced, the comprehensive performance is reduced, and the service life of the base layer is reduced. The data of the comparative example 2 and the comparative example 3 show that the high belite cement and the calcium sulphoaluminate-calcium oxide composite expanding agent have positive synergistic effect on the strength and the dry shrinkage cracking resistance of the base layer.
The above-mentioned embodiments are merely illustrative and not restrictive, and those skilled in the art can modify the embodiments without inventive contribution as required after reading this specification, but only fall within the scope of the claims of the present invention.
Claims (7)
1. The cement stabilized macadam base is characterized by being formed by mixing and constructing the following components in parts by weight: 80-85 parts of coarse aggregate, 7-10 parts of fine aggregate, 5-8 parts of high belite cement, 0.4-0.6 part of calcium sulphoaluminate-calcium oxide composite expanding agent and 8-12 parts of water, wherein a waterproof reinforcing agent is sprayed on the surface layer of the cement stabilized macadam foundation layer, and the waterproof reinforcing agent is prepared from the following raw materials in percentage by weight: 1.5-2.5% of fatty acid waterproof agent, 55-60% of styrene-acrylic emulsion, 20-25% of asbestos powder and 15-20% of water; the chemical analysis data of the calcium sulphoaluminate-calcium oxide composite expanding agent are as follows: loss on ignition of 2.10%, SO319.72%，SiO2 2.00%，Fe2O3 1.19%，Al2O3 4.39%, CaO68.62%, MgO1.74%, f-CaO47.72%; the asbestos powder is serpentine asbestos powder, and the length of the asbestos powder is 100-200 mu m.
2. The cement stabilized macadam foundation of claim 1, wherein: the coarse aggregate is limestone broken stone obtained by processing a two-stage impact type or hammer type crusher, the crushing value of the limestone broken stone is less than or equal to 26 percent, the content of needle sheets is less than or equal to 15 percent, the content of dust with the particle size of less than 0.075mm is less than or equal to 1.2 percent, and the content of soft stone is less than or equal to 3 percent; the fine aggregate is natural sand.
3. The cement stabilized macadam foundation of claim 1, wherein said coarse and fine aggregate are mixed to form a blend having a gradation range of: 100wt% through a 31.5mm square mesh sieve, 95-100wt% through a 26.5mm square mesh sieve, 75-85wt% through a 19.0mm square mesh sieve, 66-77wt% through a 16.0mm square mesh sieve, 46-58wt% through a 9.5mm square mesh sieve, 28-38wt% through a 4.75mm square mesh sieve, 20-28wt% through a 2.36mm square mesh sieve, 11-19wt% through a 1.18mm square mesh sieve, 8-15wt% through a 0.6mm square mesh sieve, 5-11wt% through a 0.3mm square mesh sieve, 3-8wt% through a 0.15mm square mesh sieve, and 0-5wt% through a 0.075mm square mesh sieve.
4. The cement stabilized macadam foundation of claim 3, wherein: the weight percentage of the mixture passing through a 0.075mm square hole sieve is 3-5 wt%.
5. A method of constructing a cement stabilized macadam foundation according to any one of claims 1 to 4, characterised in that it is constructed by the steps of:
(1) uniformly mixing the coarse aggregate, the fine aggregate, the high belite cement, the calcium sulphoaluminate-calcium oxide composite expanding agent and water to obtain a mixture;
(2) paving the mixture in the step (1) at a position to be paved, and rolling and compacting to form a base layer;
(3) curing the base layer obtained in the step (2), and spraying a waterproof reinforcing agent on the surface of the base layer during curing, so that the waterproof reinforcing agent uniformly covers the surface layer of the base layer; and obtaining the cement stabilized macadam base after curing.
6. The construction method according to claim 5, wherein: and (2) paving by using two pavers in a trapezoidal staggered arrangement in sequence, wherein the two pavers are separated by 5-8m from each other in front and back, and are paved forwards at the same time and are transversely overlapped by 100-200 mm.
7. The construction method according to claim 5, wherein: and (2) rolling by using a road roller, wherein the positions folded back from the two ends at each time are pushed forwards along with the paver in a stepped manner, and the folded parts are not at the same cross section.
Priority Applications (1)
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| CN111792893A (en) * | 2020-07-06 | 2020-10-20 | 浙江省衢州市交通建设集团有限公司 | Cement stabilized macadam base and construction method thereof |
| CN111995329A (en) * | 2020-09-07 | 2020-11-27 | 济南金曰公路工程有限公司 | Cement stabilized macadam for highway pavement base and processing method thereof |
| CN113501682A (en) * | 2021-07-09 | 2021-10-15 | 杭州市城市建设基础工程有限公司 | Construction method of large-thickness cement stabilized macadam foundation |
| CN114180896B (en) * | 2021-11-11 | 2022-08-16 | 山东省高速养护集团有限公司 | Cement stabilized macadam base composition and preparation and construction process thereof |
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| CN105399379A (en) * | 2015-12-08 | 2016-03-16 | 苏交科集团股份有限公司 | Double-mixing additive combined anti-crack type grading cement stabilized macadam base course and preparation method |
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