Cement concrete additive for repairing cement concrete road

Abstract

The present invention relates to one kind of cement concrete admixture for repairing cement concrete road. The cement concrete admixture consists of industrial slag 70-80 wt%, bentonite 10-15 wt% and silica powder 8-15 wt%, and is produced through mixing the materials and grinding to specific surface area greater than 500 sq m / kg. It is added into cement concrete, with the weight ratio between cement and the admixture being 1 to 0.025-0.035. It has the features of high early strength, slight early expansion, no after shrinkage, anticracking and antiseepage, no corrosion to reinforcing bar, etc. It is especially suitable for use in the repair engineering of cement concrete road, bridge, culvert, tunnel, etc.

Description

Technical field [0001] The patent of the invention relates to the repair of cement concrete roads, in particular to a cement concrete admixture for the repair of cement concrete roads. It is mainly used as a cement concrete admixture for various airport runways, highway concrete pavements and bridges, culverts, tunnels and other engineering maintenance. Background technique [0002] For a long time, highway maintenance departments have used asphalt concrete or concrete mixed with ordinary water reducers or early strength agents to repair damaged cement concrete pavements. Although the method is simple, there are many hidden dangers. [0003] 1. The drawbacks of asphalt concrete repairing cement concrete pavement [0004] 1. Uneven road strength and inconsistent load transfer [0005] Asphalt concrete is essentially different from cement concrete. Asphalt concrete is flexible, and cement concrete is rigid after hardening. The strength of the two is quite different, and the stress ...

AI Technical Summary

Problems solved by technology

[0006] 2. Short service life

[0007] The original service life of asphalt concrete is much shorter than that of cement concrete. It is sandwiched between cement concrete slabs and is more prone to damage. Some even need to be repaired after a winter or rainy season. Asphalt concrete repairing cement concrete can only be used as an emergency measure. , can not solve the fundamental problem

[0008] 3. Affect the smoothness of the road surface and reduce the use function

Especially when it is carried together with rigid materials such as cement concrete, asphalt concrete is more likely to produce pits and unevenness, resulting in a decrease in the flatness of the road surface and affecting the use of the road surface

[0010] 4. Unsightly

[0019] 2. Low viscosity, poor combination with old concrete

[0020] The viscosity of the cement itself is very low, not to mention that the combination between the newly poured concrete and the concrete of a certain age is not good. Even when a large amount of concrete is being constructed, if the construction interval is not treated in advance, it will lead to obvious construction joints in the concrete.

[0021] 3. Defects in the interface between new and old concrete can easily crack the concrete

The new and old concrete are joined together, and the bare stone or cement stone on the old concrete surface cannot be wrapped by cement mortar through stirring like fresh concrete. The thicker water film layer around the aggregate in mixed concrete is more likely to cause interface defects between new and old concrete, and it is easy to crack the concrete

[0023] 4. Long health preservation period affects traffic

Therefore, after the pavement is repaired, it needs a long maintenance period, and the long-term closure is more likely to cause traffic accidents, which will affect normal traffic.

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