Concrete for Road Pavements belongs to the field of building materials, and in particular relates to elastic concrete used for rapidly repairing an expansion joint. The elastic concrete is composed of three groups of materials, namely a material A, a material B and a material AC, wherein the weight ratio of the material A to the material B, to the material C is 1: (1-2.5): (8-18), the material A is composed of isocyanate or a prepolymer of the isocyanate, the material B is composed of the following components in parts by weight: 100-105 parts of polyhydric alcohols, 4-30 parts of a plasticizer, 5-20 parts of a chain extender, 0.01-1 part of a catalyst, 20-100 parts of a filler, 0-3 parts of an antioxidant, 0-3 parts of a defoamer, 0-30 parts of a coupling agent and 0-20 parts of a pigment, and the material C is aggregate. The elastic concrete has the advantages of high curing speed, adjustable curing time, good application property and self-leveling property. The elastic concrete is environment-friendly, good in toughness and small in contraction, has no generation of secondary cracking during operation process, good caking property with a base surface and excellent durability.
In order to prepare high-performance concrete for road paements, it is recommended to use two types of composite admixtures simultaneously to improve its compactness, corrosion resistance, and durability.
One is a composite additive based on polycarboxylate polymer and doped with nanostructured silicate hydrate, which has excitation and plasticizing effects.
Another type is a composite admixture based on insoluble magnesium salts and mixed with silicon dioxide with different specific surface areas, which is suitable for road engineering with strict requirements for concrete crack resistance and flexural strength.
Experiments have shown that these two additives have good compatibility. When used reasonably, the increase in flexural strength of concrete is greater than the increase in compressive strength, which helps to improve the crack resistance and durability of concrete
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Property |
Value / Description |
|
Physical state |
Liquid |
|
Color |
Grayish black |
|
Odor |
Characteristic, without putrid or other unusual odors |
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Odor threshold |
No data available |
|
pH |
7-8 (20℃) |
|
Melting point / range |
No data available |
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Freezing point |
No data available |
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Boiling point (760 mmHg) |
No data available |
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Flash point |
> 100 ℃ |
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Evaporation rate (n-butyl acetate = 1) |
No data available |
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Flammability (solid, gas) |
Not flammable |
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Lower explosion limit |
Not applicable |
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Upper explosion limit |
Not applicable |
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Thermal decomposition |
Will not decompose if stored and handled as prescribed. |
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Vapor pressure |
Not tested |
|
Relative vapor density (air = 1) |
Not tested |
|
Relative density (water = 1) |
0.95 ± 0.05 g/cm³ (20°C) |
|
Water solubility |
Immiscible (20°C) |
|
Auto-ignition temperature |
Will not self-ignite |
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Decomposition temperature |
No data available |
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Explosive properties |
No data available |
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Oxidizing properties |
No data available |
|
Viscosity |
1,000 ± 250 mPa·s, 20°C, Brookfield DC-II+, S3/100 rpm |
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