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Composite admixture for increasing cement stable broken-stone crack resistance and testing method thereof

A technology of cement-stabilized crushed stone and anti-cracking performance, which is applied in analysis materials, measuring devices, instruments, etc., can solve problems such as shrinkage and cracking of cement-stabilized crushed stone base, and achieve the effects of easy operation, improved compactness, and dosage control.

Pending Publication Date: 2018-08-24
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0003] The invention provides a composite external admixture and a testing method for improving the anti-cracking performance of cement-stabilized gravel, and solves the problem of shrinkage and cracking of cement-stabilized gravel base by adding external admixture

Method used

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  • Composite admixture for increasing cement stable broken-stone crack resistance and testing method thereof
  • Composite admixture for increasing cement stable broken-stone crack resistance and testing method thereof
  • Composite admixture for increasing cement stable broken-stone crack resistance and testing method thereof

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Embodiment Construction

[0016] The invention adopts an orthogonal test method, and considers three aspects of the unconfined compressive strength, dry shrinkage performance and temperature shrinkage performance of the cement-stabilized crushed stone base, to determine the reasonable mixing ratio of the composite external admixture. See Table 1 for the orthogonal test plan:

[0017] Table 1

[0018]

[0019] (1) Effect of composite external additives on unconfined compressive strength

[0020] Desulfurized gypsum has the function of filling the voids and reducing the original defects inside the test piece. The comprehensive addition of slaked lime and desulfurized gypsum reduces the free water in the test piece and generates a large amount of hydrate, thereby increasing the strength of the cement-stabilized gravel. In order to compare and analyze the effect of composite admixtures on the unconfined compressive strength of cement-stabilized macadam materials, a comparative test of unconfined compre...

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Abstract

The invention discloses a composite admixture for increasing cement stable broken-stone crack resistance and a testing method thereof, which belong to the field of a composite material. The crack resistance performance of a cement stable broken-stone material can be effectively increased. The composite admixture comprises the following components by mass fraction: 3% of shell powder, 0-1.2% of calcium hydroxide, 0-1.0% of desulfurized gypsum, and 0-0.1% of mekralon with a volume fraction, and the balance of a cement stable broken-stone graded aggregate. A fiber grating technology is employed for measuring shrinkage and temperature contraction coefficients. The composite admixture uses the gelling effect of the shell powder, calcium hydroxide and water are subjected to a reaction to generate expansion, an internal gap of the cement stable broken-stone material and mekralon are filled with the desulfurized gypsum, so that the adhesion stress performance between the aggregates can be enhanced, and the crack resistance performance of the cement stable broken-stone material can be effectively increased.

Description

technical field [0001] The invention belongs to the field of composite materials, and in particular relates to a composite external admixture for improving the anti-crack performance of cement-stabilized gravel and a testing method. Background technique [0002] Cement-stabilized gravel materials have good stability, erosion resistance, and fatigue resistance. They can prolong the service life of the pavement to a certain extent and are widely used in the base and subbase of high-grade highways. However, with the operation of the road network and the wide application of cement-stabilized macadam base materials, many defects of cement-stabilized macadam-base pavement gradually emerged. The most prominent problem is poor crack resistance. The base layer is prone to shrinkage cracks under the alternating changes of temperature and humidity. Under the joint action of traffic load and environmental factors, the top of the crack in the cement-stabilized macadam base will form a l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/14G01N33/00
CPCG01N33/00C04B40/0039G01N33/0003C04B14/28C04B22/064C04B22/145C04B16/0633C04B28/04
Inventor 高俊启靳佩佩俞佳炜盛余祥安平
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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