S12 Remedial Works
S12 Remedial Works
S12.1.1 The Undertaker shall be responsible for ensuring that reinstatements comply with the required performance criteria throughout the interim reinstatement and guarantee periods.
S12.1.2 When determining whether a reinstatement requires any remedial action, reference should be made to Section 2.
Should a reinstatement fail any safety requirements of this Specification, the surface shall be restored to comply with such requirements, in accordance with Section 130 of the New Roads and Street Works Act 1991.
S12.3.1 Interface Cracking
Cracking along the reinstatement interface, greater than 2.5 mm open width at the surface for more than the maximum permitted length shown in Table S12.1, shall require remedial action in accordance with the requirements of Section S12.3.3.
|Reinstatement||Surface||Maximum Crack Length|
|Small Excavations to S1.5.1||All Surfaces||500 mm total cumulative length|
|Narrow Trenches to S1.5.2 and All Other Openings to S1.5.4||Footway||1000mm maximum Crack Length,|
|All Carriageway Types||500mm maximum Crack Length|
12.3.2 Cracking Beyond Reinstatement Limits
Cracks remote from the reinstatement interface, greater than 2.5 mm open width at the surface for more than the maximum permitted length shown in Table S12.1, shall require remedial action in accordance with the requirements of Section S12.3.3, provided it can reasonably be shown that such cracks occurred directly as a result of the Undertakers' works (see also Section S10.3.4 (3) b)).
S12.3.3 Repair of Cracking
1) Cracking shall be repaired in accordance with the following methods:
a) Cracks of between 2.5 mm and 10 mm open width at the surface shall be repaired by filling with a flexible bituminous sealant, subject to the requirements of Section S11.7.
b) Cracks between 10 mm and 15 mm open width at the surface shall be repaired by filling with a flexible bituminous sealant incorporating suitable fine aggregate filler, subject to the requirements of Section S11.7.
c) Cracks of greater than 15mm open width shall be repaired using the procedure described in Section (2) a) & b) below.
2) Two re-sealing operations, excluding the original sealing, shall be permitted during the guarantee period. Further significant cracking of the third seal shall require a surface repair, as follows:
a) The surfacing materials shall be removed to the full depth of the surface course or to 40 mm depth, whichever is less; for the full length of the crack or for 1 metre length, whichever is greater. If the crack extends into the binder course layer, the affected materials shall be removed and replaced in accordance with Section S6.4.
b) Surfacing materials shall be removed over sufficient width to ensure that the repair patch extends beyond the edges of the crack, by a minimum distance equal to the nominal thickness of the replacement surface course. The minimum width of the repair patch shall be 100 mm.
c) Inclusion of a geosynthetic material at the base of the repair patch could assist in limiting any reoccurrence of cracking.
d) The replacement surface course patch shall be laid in accordance with Section S6.4.
3) Where, as a result of Undertaker's works, a crack requiring repair in accordance with Section S12.3.3 exists within 300 mm of another similar crack repair, the intermediate area shall be included in the new repair.
S12.3.4 Cracking within High Friction Surfacings
Where cracks appear in High Friction Surfacing provided that it is well bonded to the substrate and with the agreement of the Street Authority, the cracking may be sealed using a suitable epoxy or similar resin and the high friction surfacing made good. Guidance on this should be sought either from the system supplier or the HAPAS Certificate.
1) Where significant settlement of the surface beyond the edges of the reinstatement can reasonably be shown to have occurred as a direct result of the Undertaker's works, the effective width of the reinstatement shall be revised to include the actual width of the settled area. The relevant requirements of this Specification shall apply over the revised width of the reinstatement.
2) The extent of any significant settlement beyond the reinstatement limits shall be assessed, by agreement, from consideration of the following:
a) The apparent extent of any excessive areas of standing water following heavy rainfall.
b) The apparent extent of any significant deterioration of highway shape compared with the existing profile remote from the excavation.
c) The true extent of any significant deterioration of highway shape determined by profile measurements taken before and after the Undertaker's works.
1) The requirement for, and extent of, any repair shall be determined, by agreement, from a consideration of the existing and adjacent surfaces.
2) Where it can reasonably be shown that a repair is required, as a direct result of the Undertaker's works, the Undertaker shall carry out remedial actions, as necessary.