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Temperature shrinkage active-control type cement stabilized macadam and preparation method thereof

A cement-stabilized gravel and active control technology, which is applied in the field of road construction materials, achieves the effects of simple preparation process, delaying the formation and development of temperature shrinkage cracks, and low cost

Active Publication Date: 2019-03-26
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is currently no effective control method f

Method used

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  • Temperature shrinkage active-control type cement stabilized macadam and preparation method thereof

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Embodiment 1

[0033] The raw materials used in this example are by weight: P.O.4 2.5 ordinary portland cement 4.0, SBR latex 0.5, phase change crushed stone 55, ordinary crushed stone 45, water 4.7.

[0034] The invention provides a method for preparing cement-stabilized gravel with active temperature shrinkage control, comprising the following steps:

[0035] (1) Heat n-tetradecane to 100°C to make it fully melt into a liquid state, heat diatomaceous earth to 200°C, then add diatomaceous earth to the liquid n-tetradecane, control diatomite and n-tetradecane The mass percentage of tetradecane is 65%: 35%, fully stirred, dried, crushed and ground, and passed through a 0.075mm square hole sieve to obtain a composite phase change material with a phase change temperature of 5.8°C;

[0036] (2) Mix the composite phase change material, P.O.42.5 ordinary Portland cement and water, control the water-cement ratio to 0.3, the mass percentage of the composite phase change material and cement is 4%: 96...

Embodiment 2

[0044] The raw materials used in this embodiment are by weight: P.O.4 2.5 ordinary Portland cement 5.0, SBR latex 0.7, phase change crushed stone 60, ordinary crushed stone 40, water 5.5.

[0045] The invention provides a method for preparing cement-stabilized gravel with active temperature shrinkage control, comprising the following steps:

[0046](1) Heat n-heptadecane to 100°C to make it fully melt into a liquid state, heat diatomaceous earth to 200°C, then add diatomaceous earth to liquid n-heptadecane, control diatomite and n-heptadecane The mass percentage of heptane is 73%: 27%, fully stirred, dried, crushed and ground, and passed through a 0.075mm square hole sieve to obtain a composite phase change material with a phase change temperature of 21.6°C;

[0047] (2) Mix the composite phase change material, P.O.42.5 ordinary Portland cement and water, control the water-cement ratio to 0.5, the mass percentage of the composite phase change material and cement is 7%:93%, mix...

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Abstract

The invention discloses a temperature shrinkage active-control type cement stabilized macadam and a preparation method thereof, and belongs to the technical field of road building materials. The temperature shrinkage active-control type cement stabilized macadam is prepared from the following raw materials in parts by weight: 4 to 6 parts of cement, 0.4 to 0.8 part of SBR (styrene butadiene rubber) latex, 55 to 65 parts of phase-change macadam, 35 to 45 parts of common macadam, and 4.5 to 5.5 parts of water, wherein the phase-change material adopts one or a mixture of multiple of n-tetradecane, butyl stearate, n-hexadecane, and n-heptadecane. The temperature shrinkage active-control type cement stabilized macadam has the advantages that the temperature shrinkage of the cement stabilized macadam base is actively controlled from the source; proofed by results, the temperature shrinkage coefficient of the cement stabilized macadam can be reduced by more than 30%; because the temperature shrinkage crack of the cement stabilized macadam base is effectively controlled, the reflective crack is difficult to form in the service period of the asphalt road pavement, the service quality of theroad pavement is guaranteed, and the service life of the road pavement is prolonged.

Description

technical field [0001] The invention belongs to the technical field of road building materials, and in particular relates to a cement-stabilized gravel with active temperature shrinkage control and a preparation method thereof. Background technique [0002] The semi-rigid base asphalt pavement is the main pavement structure in my country, and the semi-rigid base is the main load-bearing layer. Cement-stabilized macadam base has the advantages of excellent mechanical properties, good plate performance, high rigidity, strong bearing capacity, suitable work performance and convenient construction technology, so it is the most commonly used semi-rigid base. However, after this type of mixture is opened to traffic, it is affected by the temperature difference between day and night and the annual temperature difference, and the temperature shrinks continuously and produces temperature shrinkage cracks. Under the action of traffic load, such cracks gradually extend to the pavement...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B18/02
CPCC04B18/021C04B28/04C04B2111/0075C04B14/02C04B24/2676C04B14/08C04B24/00
Inventor 杜银飞刘谱晟魏唐中韩征
Owner CENT SOUTH UNIV
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