Novel crack-resistant waterproof under-sealed layer

Abstract

The invention discloses a novel crack-resistant waterproof under-sealed layer. The objective of the invention is to provide the under-sealed layer which has low cost, is simple to pave and can effectively prolong the service life of a semi-rigid base bituminous pavement and reduce maintenance cost. The under-sealed layer comprises a glass fiber reinforced material and modified emulsified bitumen, wherein the glass fiber reinforced material and the modified emulsified bitumen are uniformly distributed on the surface of a laid pavement, a ratio of the usage amount of the modified emulsified bitumen to the surface area of the laid pavement is no less than 1 kg / m2, and a ratio of the usage amount of the glass fiber reinforced material to the surface area of the laid pavement is no less than 60 g / m2. The novel crack-resistant waterproof under-sealed layer has good bonding force with an original pavement, high interlaminar shear strength and pull strength, good antiseepage performance, good anti-crack performance and low cost; and the under-sealed layer can be paved in one shot through a synchronous-fiber-cutting-and-sprinkling bitumen distribution truck, so paving process is simple.

Description

technical field [0001] The invention relates to a lower sealing layer for pavement pavement, in particular to a lower sealing layer for re-pavement of cracked asphalt pavement with a semi-rigid base. Background technique [0002] The reasons for the reflection cracks on the semi-rigid base asphalt pavement are mainly due to the unreasonable mineral material gradation design (suspended dense type), excessive fine material (particles below 0.075mm) and high cement dosage in the cement-stabilized base. The semi-rigid base layer cracks due to excessive water content during construction, untimely maintenance after construction or improper maintenance methods. After the base layer cracks, it loses the ability to resist tensile stress, and the stress is transferred to the surface layer at the cracked position, forming the stress concentration of the surface layer at the cracked place. Especially at low temperature in winter, the modulus of the asphalt pavement is relatively large,...

AI Technical Summary

Problems solved by technology

Fiber-reinforced sealing technology has only been implemented in my country since 2007, but most of them are imported technologies from abroad, and are not suitable for expressways in my country. For example, domestic expressways are all closed. High, which is different from most expressways in foreign countries, which also increases the cost of road maintenance virtually, and improves the performance requirements of road maintenance, while the adhesion and waterproof performance of the lower seal layer are particularly important