1.0.1 This Specifications is formulated based on scientific and practical principles and in combination with the actual conditions of cement concrete pavement development so as to improve the cement concrete pavement maintenance, guarantee the pavement service quality, extend the pavement service life and adapt to the development of highway transportation.
1.0.2 This Specifications is applicable to the highway cement concrete pavement maintenance.
1.0.3 Basic requirements for cement concrete pavement maintenance:
1 Cement concrete pavement maintenance must carry out the policy of "prevention first and combining prevention with control". Carry out preventative and regular maintenance as well as corresponding repairing according to the actual situations and conditions of pavement as well as hydrologic, geologic, climate, traffic and highway grade conditions; heavy and intermediate maintenance or special project engineering shall be arranged for pavement repairing in a wider range to make the pavement in good technical condition.
2 Cement concrete pavement shall focus on mechanical maintenance and adopt new technique, material and technology actively.
3 Cement concrete pavement maintenance must carry out safety production policy. And the safety technology, labor protection, etc. must agree with relevant regulations. Safety production, civilized construction and environment protection shall be achieved.
1.0.4 Besides those specified in this Specifications, the cement concrete pavement maintenance shall also comply with those in the relevant current national and professional standards.
2 Terminologies
2.0.1 Plain concrete pavement
Cement concrete pavement not reinforced except the joint zone and local areas.
2.0.2 Reinforced concrete pavement
Cement concrete pavement distributed with longitudinal/transversal reinforcements or reinforcing mesh in concrete slab.
2.0.3 Steel fiber reinforced concrete pavement
Concrete pavement with steel fibre mixed into concrete.
2.0.4 Continuous reinforced concrete pavement
Cement concrete pavement allocated with continuous reinforcement longitudinally and with no horizontal constriction joint except the expansion joint at the joint with other pavements or adjacent to the structure as well as construction joint as construction requires.
2.0.5 Concrete block pavement
Concrete pavement paved with various concrete blocks that are prefabricated by squeezing concrete mixtures.
2.0.6 Fine aggregate concrete
Mixtures composed of aggregates with the maximum particle diameter of 10mm.
2.0.7 Blow-up
The slab body of cement concrete pavement arches due to the failure of expansion joint when the temperature rises.
2.0.8 Blow ups
The upward thrust of concrete pavement slab in local road section.
2.0.9 Depression
The pavement depression caused by the vertical deformation of subgrade.
2.0.10 Scaling
Pavement's shallow layer spalling caused by freezing and other corrosions.
2.0.11 Map cracking
The netlike cracks present on slab surface in crisscross.
2.0.12 Plastic shrinkage crack
The slab surface cracks horizontally or slantly and do not extend to the pavement slab edge.
2.0.13 Corner break
The distance from slab angle to both ends of the slant crack is less than half of the side length and the crack plane is vertical and runs through the whole slab thickness.
2.0.14 Faulting of slab ends
The vertical height difference of adjacent slabs at joints or cracks.
2.0.15 Pot hole
Local pits formed by the shedding of pavement slab coarse aggregates.
2.0.16 Pavement pumping
The base materials are liquified due to poor pavement drainage and the diluted mud or fine materials under pavement are extruded out from joints or cracks by the pumping action which is caused by the up and down movement of slab body under the repeating action of riding.
2.0.17 Surface angularity
The exposing of aggregates appeared by the severe wear of pavement under the action of riding.
2.0.18 Hydroplaning
