Fast hardening early strength concrete for overall width repair of cement concrete pavement

A cement concrete, full-thickness technology, applied in the field of building materials, can solve the problems of unsuitable road maintenance management unit maintenance, existence of flatness, load transfer between plates, poor economy, etc., to facilitate large-scale popularization and application, reduce maintenance and repair. Cost, repair speed effect

Active Publication Date: 2013-10-23
CCCC HIGHWAY MAINTENANCE ENG TECH
5 Cites 5 Cited by

AI-Extracted Technical Summary

Problems solved by technology

For example, the prefabricated assembly technology is suitable for large-scale and large-area pavement maintenance, but it is not economical and practical for small-scale and local pavement damage, and there are problems of flatness and load transfer between panels; special materials or special reinforcing agents are used. It can meet the design strength requirements of the pavement in a relatively short period of time and resume traffic. However, due to the limited selection of raw materials, it is not conducive to...
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Abstract

The invention relates to a fast hardening early strength concrete for overall width repair of a cement concrete pavement. The fast hardening early strength concrete is prepared from the following raw materials in parts by weight: 450-480 parts of cement, 620-660 parts of medium sand, 1120-1140 parts of macadam, 140-160 parts of water and 4-6 parts of additive. The fast hardening early strength concrete has the beneficial effects that (1) the fact repair material for the cement concrete pavement, provided by the invention, has the characteristics of high early strength, high overall width repair speed for the damaged cement concrete pavement, capability of realizing clear road within 24h, convenience for realizing favorable traffic conditions, good working performance and the like; and (2) the cement, the medium sand, the macadam and the additive adopted by the invention are all common base materials on the market, and special materials which have a fast hardening early strength effect, but are high in cost and are not widely applied are not adopted, so that the fast hardening early strength concrete can be favorably popularized and applied in a large scale, and the maintenance and repair cost is reduced.

Technology Topic

Repair materialCrushed stone +6

Examples

  • Experimental program(3)

Example Embodiment

[0012] Example 1
[0013] Weigh 525 kg of early-strength Portland cement, 640 kg of medium sand, 1137 kg of crushed stone, 146 kg of water, and 5.12 kg of KDSP-1 admixture. Mix the above-mentioned raw materials evenly to obtain a full-thick cement concrete road surface. Fast-hardening and early-strength concrete for repair.
[0014] Technical indicators of fast-hardening and early-strength concrete fast-repairing materials for full-thickness repair of cement concrete pavements: 24-hour flexural strength 5.06MPa, 24-hour compressive strength 41.5MPa.

Example Embodiment

[0015] Example 2
[0016] Weigh 525 kg of early-strength Portland cement, 640 kg of medium sand, 1137 kg of crushed stone, 146 kg of water, and 4.65 kg of KDSP-1 admixture. Mix the above-mentioned raw materials evenly to obtain the full thickness of the cement concrete road Fast-hardening and early-strength concrete for type repair.
[0017] Technical indicators of fast-hardening and early-strength concrete quick-repair materials for full-thickness repair of cement concrete pavement: 24-hour flexural strength 4.99MPa, 24-hour compressive strength 32.7MPa.

Example Embodiment

[0018] Example 3
[0019] In order to fully illustrate the technical effects of the present invention, a comparative test using special materials and similar proportions is used to compare and analyze the benefits of the technical invention results.
[0020] Weigh 554 kg of fast-hardening sulphoaluminate cement, 554 kg of medium sand, 1184 kg of crushed stone, 227 kg of water, and 54 kg of white latex, and mix the above components evenly to obtain a full-thick cement concrete pavement repair fast Hard early-strength concrete.
[0021] Technical indicators of fast-hardening and early-strength concrete fast-repairing materials for full-thickness repair of cement concrete pavements: 24-hour flexural strength 5.21MPa, 24-hour compressive strength 21.53MPa.
[0022] Except for Example 3, other concretes made of fast hardening sulfoaluminate cement or other admixtures have a 24-hour compressive strength of no more than 30MPa, and the effect is much lower than that of Example 1 and implementation of the present invention. Example 2 made concrete.
[0023] According to the analysis of the above-mentioned test results, it can be known that the technical results of the present invention are basically consistent with the effects achieved by using special cement at a similar ratio. However, the main raw material Portland cement used in the present invention is widely used and easy to purchase nearby; the amount of cement in the unit volume mixture of the present invention is less; the unit price of Portland cement is lower than that of fast hardening sulfoaluminate cement. Therefore, the results of the present invention are more generalizable and have significant economic benefits.

PUM

PropertyMeasurementUnit
Flexural strength5.06mPa
Compressive strength41.5mPa
Flexural strength4.99mPa

Description & Claims & Application Information

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