CN109516736A - A kind of temperature shrinkage active control type cement stabilized macadam and preparation method thereof - Google Patents
A kind of temperature shrinkage active control type cement stabilized macadam and preparation method thereof Download PDFInfo
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- CN109516736A CN109516736A CN201811455973.9A CN201811455973A CN109516736A CN 109516736 A CN109516736 A CN 109516736A CN 201811455973 A CN201811455973 A CN 201811455973A CN 109516736 A CN109516736 A CN 109516736A
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- cement
- phase
- temperature shrinkage
- active control
- stabilized macadam
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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
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/021—Agglomerated materials, e.g. artificial aggregates agglomerated by a mineral binder, e.g. cement
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a kind of temperature shrinkage active control type cement stabilized macadams and preparation method thereof, belong to pavement construction material technical field, it is made of cement, SBR latex, phase transformation rubble, ordinary gravel and water, each raw material is by weight are as follows: cement 4~6, SBR latex 0.4~0.8, phase transformation rubble 55~65, ordinary gravel 35~45, water 4.5~5.5;The phase-change material uses one of n-tetradecane, butyl stearate, hexadecane, n-heptadecane or a variety of mixtures.The temperature shrinkage of present invention active control cement stabilized macadam base from source, the results show that the temperature shrinkage coefficient of cement stabilized macadam of the present invention can reduce 30% or more.Since the temperature shrinkage fracture of cement stabilized macadam base is effectively controlled, bituminous pavement is hardly formed reflection crack within the period of service, ensure that road surface service quality, and can extend road surface service life.
Description
Technical field
The invention belongs to pavement construction material technical fields, and in particular to a kind of temperature shrinkage active control type cement is steady
Determine rubble and preparation method thereof.
Background technique
Semi-rigid asphalt pavement is the main pavement structure form in China, wherein semi-rigid type base is main load-bearing
Layer.Cement stabilized macadam base has good mechanical performance, the work that plate body performance is good, rigidity is big, bearing capacity is strong, suitable
The advantages that performance and convenient construction technology, thus it is presently the most common semi-rigid type base form.But this type mixes
Material after open to traffic, by day and night temperature and annual range of temperature is influenced that temperature shrinkage constantly occurs and generates temperature shrinkage to split
Seam.This crack is gradually extended to supercrust under action of traffic loading, forms reflection crack, seriously affects the service on road surface
Quality and service life.
Currently, the measure of traditional prevention and treatment asphalt pavement reflective cracking is mixed including increasing thickness of bituminous surface, improving pitch
Anti-crack ability, setting geotextiles interlayer, glass fiber grid interlayer, SAMI stress absorbing layer and the asphalt macadam binder course of material are closed, this
It is all a bit passively anti-countermeasure, though the effective formation that cannot fundamentally contain reflection crack.Counnter attack key is will be
Start on source, for example, actively going cracking initiation and the development of control base.
In recent years, many researchs improve cement from various aspects such as aggregate grading, cement dose, water content, construction methods
The shrinkage of stabilization gravel;Also have to study and add the cracking resistance that fiber etc. improves mixture into Cement Stable Macadam Mixture
Performance.Temperature shrinkage occupies larger proportion in the contraction of mixture, especially reaches some strength, water dispersion in mixture
After having lost, temperature shrinkage dominates the entire contraction process of mixture.However, there is no be directed to cement stabilized macadam temperature at present
Spend the effective control method shunk.
Summary of the invention
In view of the deficiencies of the prior art, the purpose of the present invention is to provide a kind of temperature shrinkage active control type cement is steady
Rubble and preparation method thereof is determined, with the formation and development of the temperature shrinkage fracture of active control cement stabilized macadam base.
In order to achieve the above object, the present invention the following technical schemes are provided:
The present invention provides a kind of temperature shrinkage active control type cement stabilized macadam, broken by cement, SBR latex, phase transformation
Stone, ordinary gravel and water are made, and each raw material is by weight are as follows: cement 4~6, SBR latex 0.4~0.8, phase transformation rubble 55~
65, ordinary gravel 35~45, water 4.5~5.5;
The phase transformation rubble is made of diatomite, phase-change material, cement and water, and phase-change material uses n-tetradecane, tristearin
One of acid butyl ester, hexadecane, n-heptadecane or a variety of mixtures.
Preferably, the mass percent of the diatomite and phase-change material is (50~80%): (20~50%).
Preferably, the phase transformation rubble is made of 2 grades of coarse aggregates and 1 grade of fine aggregate, coarse aggregate specification is respectively
4.75~9.5mm and 2.36~4.75mm, the specification of fine aggregate are 0~2.36mm.
Preferably, the mass ratio that third gear is gathered materials in the phase transformation rubble is (4.75~9.5mm): (2.36~
4.75mm): (0~2.36mm)=(36~42): (20~28): (34~40).
Preferably, the particle diameter distribution of the ordinary gravel is 9.5~31.5mm.
Preferably, the cement be P.O.42.5 ordinary portland cement, the presetting period >=3h, final setting time >=6h,
3d cement mortar strength >=11MPa.
The inventive concept total as one, the present invention also provides the temperature shrinkage active control type cement stabilized macadams
Preparation method, comprising the following steps:
S1. phase-change material is heated, it is made sufficiently to be melted into liquid, the diatomite heated is added to the phase transformation of liquid
It in material, is sufficiently stirred, dries, be sieved after smashing and grinding, obtain composite phase-change material;
S2. composite phase-change material, cement and water mix is uniform, it is conserved 7 days after hardening, phase transformation Behavior of Hardened Cement Paste is prepared;
S3. phase transformation Behavior of Hardened Cement Paste obtained by step S2 is broken into particle diameter distribution in 4.75~9.5mm, 2.36~4.75mm and 0
The phase transformation rubble of~2.36mm;
S4. SBR latex, phase transformation rubble, ordinary gravel, cement and water are sufficiently stirred by predetermined ratio, temperature is prepared
Degree shrinks active control type cement stabilized macadam.
Further, in step S1, the heating temperature of the phase-change material is 80~120 DEG C.
Further, in step S1, the heating temperature of the diatomite is 180~220 DEG C.
Further, in step S1, the square hole screen of 0.075mm is crossed after smashing and grinding.
Further, in step S2, the mass percent of the composite phase-change material and cement is (4~8%): (92~
96%).
Further, in step S2, control water-cement ratio is 0.3~0.5.
The present invention provides a kind of Cement Stable Macadam Mixture with self-regulated temperature function, when road surface and external environment into
When row heat exchange, self-temperature-regulating cement stabilized macadam is able to maintain temperature-resistant or temperature is delayed to change, in microthermal climate
Under, when road surface and extraneous generation heat exchange, which is able to maintain the reduction of the temperature-resistant or delay temperature in base, from
And the reflection crack of later period bituminous pavement can be reduced so that temperature shrinkage fracture to occur in active control base, improve road surface service
Quality simultaneously extends service life.
Temperature shrinkage active control type cement stabilized macadam of the present invention, by adding SBR latex, filling concrete is steady
The internal voids for determining crushed stone material increase the flexibility of cement stabilized macadam base, improve its transition region plane of weakness, to improve
Cement stabilized macadam crack resistance.The present invention is absorbed using phase-change material phase transition process or discharges amount of heat and self-temperature not
The characteristic of very little is altered or varied, be prepared for phase transformation rubble and substitutes part ordinary gravel, works as road surface and external environment to play
It is constant or temperature is delayed to change that the phase-change material for including when heat exchange occurs, in phase transformation rubble is able to maintain bulk temperature,
To reduce the generation of temperature shrinkage fracture.
Compared with prior art, advantageous effects of the invention are as follows:
(1) temperature shrinkage active control type cement stabilized macadam of the present invention, can from source active control cement
The temperature shrinkage of stabilized macadam base, the results show that the temperature shrinkage coefficient of cement stabilized macadam of the present invention can reduce 30%
More than.
(2) temperature shrinkage active control type cement stabilized macadam of the present invention, due to the temperature of cement stabilized macadam base
Degree contraction fissure is effectively controlled, and bituminous pavement is hardly formed reflection crack within the period of service, ensure that road surface Service Quality
Amount, and road surface service life can be extended.
(3) simple, at low cost, the easy implementation of preparation process of the present invention has the function for actively adjusting temperature in semi-rigid type base
Can, to effectively delay temperature shrinkage fracture formation and development, solution is provided to reduce asphalt pavement reflective cracking.
Specific embodiment
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described reality
Example is applied to be only a part of the embodiment of the present invention, rather than whole embodiments, based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without making creative work belongs to what the present invention protected
Range.
The present invention program is further elaborated below with reference to embodiment.
Embodiment 1
The present embodiment is raw materials used by weight are as follows: P.O.42.5 ordinary portland cement 4.0, SBR latex 0.5, phase
Become rubble 55, ordinary gravel 45, water 4.7.
The present invention provides a kind of preparation method of temperature shrinkage active control type cement stabilized macadam, comprising the following steps:
(1) n-tetradecane is heated to 100 DEG C, it is made sufficiently to be melted into liquid, by kieselguhr to 200 DEG C, then
Diatomite is added in the n-tetradecane of liquid, the mass percent for controlling diatomite and n-tetradecane is 65%:35%,
It is sufficiently stirred, dries, the square hole screen of 0.075mm is crossed after smashing and grinding, obtain composite phase-change material, phase transition temperature is 5.8 DEG C;
(2) composite phase-change material, P.O.42.5 ordinary portland cement and water are mixed, control water-cement ratio is 0.3, multiple
The mass percent 4%:96% of phase-change material and cement is closed, mix is uniform, conserves 7 days after hardening, phase transformation cement is prepared
Stone;
(3) phase transformation Behavior of Hardened Cement Paste is broken into particle diameter distribution in 4.75~9.5mm, 2.36~4.75mm and 0~2.36mm
Phase transformation rubble, the ratio that each shelves gather materials in phase transformation rubble are as follows: (4.75~9.5mm): (2.36~4.75mm): (0~2.36mm)
=38:26:36;
(4) SBR latex, phase transformation rubble, ordinary gravel are mixed by predetermined ratio, water-wet is added and mixes 1min, mix is complete
1h is placed at mixture package plastic film, P.O.42.5 ordinary portland cement wet-mixing 3min is eventually adding, is then vibrating
Forming cylinder body test specimen (150 × h100mm of Ф) under molding mode, using " the highway engineering stabilized with inorganic binder testing of materials
Regulation " strain gauge method as defined in (JTG E51-2009) measures the temperature shrinkage coefficient in 0~10 DEG C of section, as a result such as 1 institute of table
Show.
Comparative example 1
This comparative example is raw materials used by weight are as follows: P.O.42.5 ordinary portland cement 4.0, SBR latex 0.5 are general
Logical rubble 100, water 4.7.
The ratio that each shelves gather materials in ordinary gravel are as follows: (9.5~31.5mm): (4.75~9.5mm): (2.36~
4.75mm): (0~2.36mm)=45:21:14:20.
The measurement of mixture mix and temperature shrinkage coefficient is identical with embodiment 1, and temperature shrinkage coefficient results are such as
Shown in table 1.
Embodiment 2
The present embodiment is raw materials used by weight are as follows: P.O.42.5 ordinary portland cement 5.0, SBR latex 0.7, phase
Become rubble 60, ordinary gravel 40, water 5.5.
The present invention provides a kind of preparation method of temperature shrinkage active control type cement stabilized macadam, comprising the following steps:
(1) n-heptadecane is heated to 100 DEG C, it is made sufficiently to be melted into liquid, by kieselguhr to 200 DEG C, then
Diatomite is added in the n-heptadecane of liquid, the mass percent for controlling diatomite and n-heptadecane is 73%:27%,
It is sufficiently stirred, dries, the square hole screen of 0.075mm is crossed after smashing and grinding, obtain composite phase-change material, phase transition temperature is 21.6 DEG C;
(2) composite phase-change material, P.O.42.5 ordinary portland cement and water are mixed, control water-cement ratio is 0.5, multiple
The mass percent 7%:93% of phase-change material and cement is closed, mix is uniform, conserves 7 days after hardening, phase transformation cement is prepared
Stone;
(3) phase transformation Behavior of Hardened Cement Paste is broken into particle diameter distribution in 4.75~9.5mm, 2.36~4.75mm and 0~2.36mm
Phase transformation rubble, the ratio that each shelves gather materials in phase transformation rubble are as follows: (4.75~9.5mm): (2.36~4.75mm): (0~2.36mm)
=36:30:34;
(4) SBR latex, phase transformation rubble, ordinary gravel are mixed by predetermined ratio, water-wet is added and mixes 1min, mix is complete
1h is placed at mixture package plastic film, P.O.42.5 ordinary portland cement wet-mixing 3min is eventually adding, is then vibrating
Forming cylinder body test specimen (150 × h100mm of Ф) under molding mode, using " the highway engineering stabilized with inorganic binder testing of materials
Regulation " strain gauge method as defined in (JTG E51-2009) measures the temperature shrinkage coefficient in 20~30 DEG C of sections, as a result such as 1 institute of table
Show.
Comparative example 2
This comparative example is raw materials used by weight are as follows: P.O.42.5 ordinary portland cement 5.0, SBR latex 0.7 are general
Logical rubble 100, water 5.5.
The ratio that each shelves gather materials in ordinary gravel are as follows: (9.5~31.5mm): (4.75~9.5mm): (2.36~
4.75mm): (0~2.36mm)=40:22:18:20.
The measurement of mixture mix and temperature shrinkage coefficient is identical with embodiment 2, and temperature shrinkage coefficient results are such as
Shown in table 1.
1 cement stabilized macadam temperature shrinkage coefficient of table
As shown in Table 1, the temperature shrinkage coefficient ratio comparative example 1 of embodiment 1 reduce 0.23 μ ε/DEG C, reduction ratio is
40.4%;The temperature shrinkage coefficient ratio comparative example 2 of embodiment 2 reduce 0.25 μ ε/DEG C, reduce ratio be 32.1%.The two
Comparing result illustrates the temperature shrinkage coefficient overall reduction of self-temperature-regulating cement stabilized macadam proposed by the invention, can be used for leading
Dynamic control temperature shrinkage fracture.
The above description is only an embodiment of the present invention represents, and can prepare other self-regulated warm water according to method of the invention
Other semi-rigid sub-base materials such as cement-stabilizing broken stone, two-ash broken stones are used to control the temperature shrinkage fracture of base, all according to the present invention
The equivalent and modification that spiritual claim is done, all should belong to covering scope of the invention.
Claims (10)
1. a kind of temperature shrinkage active control type cement stabilized macadam, which is characterized in that by cement, SBR latex, phase transformation rubble,
Ordinary gravel and water are made, and each raw material is by weight are as follows: cement 4~6, SBR latex 0.4~0.8, and phase transformation rubble 55~65,
Ordinary gravel 35~45, water 4.5~5.5;
The phase transformation rubble is made of diatomite, phase-change material, cement and water, and phase-change material uses n-tetradecane, stearic acid fourth
One of ester, hexadecane, n-heptadecane or a variety of mixtures.
2. temperature shrinkage active control type cement stabilized macadam according to claim 1, which is characterized in that the diatomite
Mass percent with phase-change material is (50~80%): (20~50%).
3. temperature shrinkage active control type cement stabilized macadam according to claim 1, which is characterized in that the phase transformation is broken
Stone is made of 2 grades of coarse aggregates and 1 grade of fine aggregate, and coarse aggregate specification is respectively 4.75~9.5mm and 2.36~4.75mm, thin
The specification gathered materials is 0~2.36mm.
4. temperature shrinkage active control type cement stabilized macadam according to claim 3, which is characterized in that the phase transformation is broken
The mass ratio that third gear is gathered materials in stone is (4.75~9.5mm): (2.36~4.75mm): (0~2.36mm)=(36~42): (20
~28): (34~40).
5. temperature shrinkage active control type cement stabilized macadam according to any one of claims 1 to 4, feature exist
In the particle diameter distribution of the ordinary gravel is 9.5~31.5mm.
6. temperature shrinkage active control type cement stabilized macadam according to any one of claims 1 to 4, feature exist
In, the cement be P.O.42.5 ordinary portland cement, the presetting period >=3h, final setting time >=6h, 3d cement mortar strength >=
11MPa。
7. the preparation method of temperature shrinkage active control type cement stabilized macadam described according to claim 1~any one of 6,
Characterized by comprising the following steps:
S1. phase-change material is heated, it is made sufficiently to be melted into liquid, the diatomite heated is added to the phase-change material of liquid
In, it is sufficiently stirred, dries, be sieved after smashing and grinding, obtain composite phase-change material;
S2. composite phase-change material, cement and water mix is uniform, it is conserved 7 days after hardening, phase transformation Behavior of Hardened Cement Paste is prepared;
S3. by phase transformation Behavior of Hardened Cement Paste obtained by step S2 be broken into particle diameter distribution 4.75~9.5mm, 2.36~4.75mm and 0~
The phase transformation rubble of 2.36mm;
S4. SBR latex, phase transformation rubble, ordinary gravel, cement and water are sufficiently mixed stirring by predetermined ratio, temperature is prepared
Degree shrinks active control type cement stabilized macadam.
8. the preparation method of temperature shrinkage active control type cement stabilized macadam according to claim 7, which is characterized in that
In step S2, the mass percent of the composite phase-change material and cement is (4~8%): (92~96%).
9. the preparation method of temperature shrinkage active control type cement stabilized macadam according to claim 7, which is characterized in that
In step S2, control water-cement ratio is 0.3~0.5.
10. the preparation method of temperature shrinkage active control type cement stabilized macadam according to claim 7, feature exist
In in step S1, the heating temperature of the phase-change material is 80~120 DEG C;The heating temperature of the diatomite is 180~220
℃。
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CN110423085B (en) * | 2019-09-11 | 2020-08-04 | 北京科技大学 | Anti-cracking water-stabilizing layer material for electrolytic manganese slag-containing road and preparation method thereof |
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