High-performance plastic cracking resistance bridge deck pavement concrete and construction method thereof

Abstract

The invention discloses high-performance plastic cracking resistance bridge deck pavement concrete which is prepared from the following raw materials in percentage by weight: 14.7% to 18.4% of cement,28% to 31% of medium sand, 41% to 44% of broken stones, 1.2% to 2.0% of polycarboxylate superplasticizer, 5.8% to 6.9% of water and 0.029% to 0.036% of water-absorbent resin. Accordingly, a corresponding construction method is also established, wherein the water-absorbent resin plays an internal nourishing function by gradually releasing pre-absorbed free moisture in a later cementing material hydration environment; a surface protection agent can effectively inhibit an evaporation amount of the free moisture, isolates exchange loss of the moisture and the surrounding environment and takes anexternal resistance effect. By applying an internal-nourishing external-resistance comprehensive maintenance plasticity-resistance cracking-resistance technology provided by the invention, early plastic cracking resistance of thin-wall bridge deck pavement concrete can be greatly promoted, reduction on pavement maintenance cost is implemented, the service life of a bridge deck pavement structure is prolonged, and the high-performance plastic cracking resistance bridge deck pavement concrete has important application value.

Description

technical field [0001] The invention belongs to the technical field of bridge deck pavement, in particular to a high-performance plastic cracking-resistant bridge deck pavement concrete and a construction method thereof. Background technique [0002] Reinforced cement concrete bridge deck pavement is the main structural form of bridge deck pavement in my country at present. It has the characteristics of low cost, high strength, strong impact resistance, and good crack resistance. However, the construction environment of bridge deck pavement is harsh, and its construction quality is particularly affected by ambient temperature, humidity and windy weather. Therefore, due to the unreasonable maintenance measures and fast water evaporation in the early stage of the current bridge deck pavement, the occurrence rate of plastic cracks is above 80%, and the crack depth is mostly between 3 and 20mm. The existence of cracks is the passage of corrosive media, which will seriously Redu...

AI Technical Summary

Problems solved by technology

However, the construction environment of bridge deck pavement is harsh, and its construction quality is particularly affected by ambient temperature, humidity and windy weather

Therefore, due to the unreasonable maintenance measures and fast water evaporation in the early stage of the current bridge deck pavement, the occurrence rate of plastic cracks is above 80%, and the crack depth is mostly between 3 and 20mm. The existence of cracks is the passage of corrosive media, which will seriously Reduced service life of bridge deck pavement

After the existing bridge deck pavement is poured, it is covered with a film to retain water and intermittently sprinkled for maintenance. The water on the surface cannot be effectively suppressed and the water evaporates freely, and there is not enough water inside to ensure the continuity of the cementitious material. Therefore, not only will plastic cracks occur in the thin-walled bridge deck pavement layer in the morning, but also the binding force between concrete and steel bars cannot achieve the expected effect due to the existence of micro-crack damage

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