Good Practice Guide
SEARCH
SITEMAP ACCESSIBILITY

AVs in Mastic Asphalt

Date Submitted: Oct 2016

Question:

AVs in Mastic Asphalt

Is Air Void testing of HRA as stated within the SROH only applicable to the conventional family of HRA’s as stated within the SROH on page 97 which says as follows:   “A2.1.1 Surface Course Mixtures   The following HRA surface course mixture options are permitted…..  (3) Footways, Footpaths and Cycle Tracks  HRA surface course mixture shall be HRA 15/10F surf 100/150 rec or, HRA 15/10F surf 70/100 rec or HRA 15/10F surf 40/60 rec….” If we are required to use a “sand carpet” type of fine aggregate material (as is permitted within S8.3.3. and/or S8.3.4 of the SROH) then ,according to the information on the materials collection tickets, the material we are using is titled as either HRA 0/2F for 2mm aggregate, or, if we requested 4mm aggregate, it would then become HRA0/4F Neither of the above fit anywhere within the SROH footway definition of a HRA which leads me to believe that sand carpet, although a form of HRA, falls under the “any other bituminous materials within the specification” which, as per the Air Void table on page 77 means that there is guidance within the SROH on compaction but no air void limits apply.   Can you confirm that the fine asphalt footway reinstatement material commonly known as “sand carpet” is actually a material that can have the relevant air void test applied to it?

Read Answer


Coring in Fillets and Compaction around poles

Date Submitted: Oct 2016

Question:

Compaction Adjacent to Structures [particularly Poles]


 There are circumstances where Openreach carry out small excavations (e.g. pole testing).  A number of HAs have demanded that the dimensions of such excavations should be expanded such that mechanical compaction equipment can fit into the space available. Whilst recognising that all excavations need to be compacted correctly, Openreach would argue that hand compaction is acceptable.  We would request a statement in the SRoH covering these circumstances

Read Answer


Coring in Fillets and Compaction around poles

Date Submitted: Oct 2016

Question:

Coring of Fillets [Areas of reinstatement in close proximity to Apparatus

Openreach have been presented with invoices for cores taken close to surface apparatus such that it would be impossible to take a fillet in accordance with current SRoH requirements, given the flanges which surround said apparatus.  We would like a definitive statement in the SRoH which defined what (if any) tests are appropriate in such circumstances.

Read Answer


Coring in Trimback areas

Date Submitted: Oct 2016

Question:

Bound Layers in reinstatements within extended trim-lines failing Air Voids


Cores fail for air voids where the core has been taken in the trim back area around a utility reinstatement, are we required to dig out the existing HA backfill and replace it in compacted layers?

Read Answer


Coring in Trimback areas

Date Submitted: Oct 2016

Question:

Depth of Bound Layers in reinstatements within extended trim-lines

   
Cores fail for overall depth after being taken in the trimmed back area around our reinstatement, in these cases the trim back is full depth down to the existing HA backfill material, are we required to dig out the HA sub base material to a depth suitable for the SROH ?

Read Answer


Coring in Trimback Areas

Date Submitted: Oct 2016

Question:

Depth of Surface Course in reinstatements within extended trim-lines

Cores that are being taken in trimmed back areas around our reinstatements are failing for lack of surface course depth where the utility has reinstated on top of the existing HA binder course.

Read Answer


Exemption from Coring (less than 200mm)

Date Submitted: Oct 2016

Question:

Exemption from Coring (less than 200mm)

 It is my understanding that as per S10.2.3 2) all bituminous materials must be compacted and comply with the S10.1. Restriction for core extraction in air voids section, S10.2.3 4) “with no part of any core being within 100 mm of any surface apparatus within the reinstatement.” Under Notes for guidance this is explained as NG10.2.3 5) “When taking cores near surface apparatus, Section S10.2.3(4) requires a minimum clearance of 100mm to avoid damaging the apparatus or structure it is bedded on. However it is possible that some surface apparatus may have wider than normal flanges and there may be instances where a greater clearance is required to avoid damage. If doubt exists, liaison with the owner of the apparatus should be undertaken in advance.” Within the adopted highway there are a number of surface apparatuses where the undertaker has consistently changed their working practice to reduce the size of the excavation so there is no part greater than 200mm from the apparatus. Stopping us from fitting a 100mm core more than 100mm from the apparatus. As highways authority we are concerned that the undertaker could not compact the material in the correct material lifts. The undertaker is claiming it can’t be tested as per the above comment in S10.2.3 4) and minimum trimback from S11.5.1.3 don’t apply as it is not a carriageway.  Example:   The works: Installation of a water meter, the surface apparatus is an Atplas Box.   Solution: I would like to core within the trimback.  This would be a full 100mm core but would be within the 100mm of the surface apparatus. There is absolutely no risk of damage to the apparatus as the core will be beyond the apparatus and its supports.   As above, if we as the authority extract a core within 100mm of a surface apparatus and cause no damage to the apparatus and we send the core for air void testing and it fails to table S10.1. Are we correct to issue a defect for air voids using this result as valid failure?

Read Answer


Use of Foamed Concretes for Reinstatements

Date Submitted:

Question:

Clarification as to the use of Foamed Concretes for Reinstatements 
Read Answer


Use of Flowable Mastic Asphalt under the SROH

Date Submitted:

Question:

We have been using Ironguard (a proprietary flowable mastic asphalt) very successfully in several Highway Authority areas to reinstate around ironwork in the carriageway, especially on S81 work.  The product is HAPAS approved, and in our views is permitted under the SROH.  We have one Highway Authority who has said the product cannot be used under the SROH.  We understand the same Highway Authority permits its own contractor to use the product in their area.  


It would be appreciated if your group could review this and confirm that this product can be used in the carriageway to reinstate around ironworks. 

Read Answer


Use of flowable concrete for binder course around access covers & frames

Date Submitted: June 2014

Question:

Our supplier of frames and covers are advising us to use a flowable concrete binder course which is HAPAS approved up to 60mm from the road surface and acceptable under the Design Manual for Roads and Bridges HA104/09. On top of this the matching surface course to the existing road can be used.

 

We wish to follow this specification however some Highway Authorities are claiming this is unacceptable under the SROH and 100mm of flexible surface course & binder course is required. I understand that under S11.5.1.5 bedding material, including C32/40 strength concrete can fill the excavation to within 100mm of the road surface but the flowable concrete we are using is not “bedding material”.

 

Attached to this email are the data sheets for the material we are wishing to use and would be grateful if the SROH Working Group can clarify if material is acceptable (Ultracrete QC10) bearing in mind the quote from S11.5.1 “Works undertaken to apparatus shall be to the standard and specification of the owner of the apparatus”.

Read Answer


End Product Testing of Unbound Materials

Date Submitted: November 2013

Question:

A Highway Authority has issued an Undertaker with a number of Defect Notices, stating non-compliance in respect of compaction of unbound materials. The HA contends that the unbound material is insufficiently compacted on the basis of results from Panda Penetrometer compaction testing results, carried out following core extraction. In part, the HA is quoting recent field-based trials/research which used the same Panda Penetrometer testing to check CBR measurements, and thereby classified the unbound layers as achieving CBRs of 30% as the pass or fail threshold.

Does the current SROH 3rd Edition support retrospective end-product testing of unbound materials as determining compliance?

Read Answer


Enforcement of different Editions of the SROH Code of Practice

Date Submitted: October 2012

Question:

If a utility worked at a time that the SROH 1st Edition was in force, when Air Voids were not part of the specification, then if a HA subsequently chooses to core this reinstatement, can they legitimately fail the reinstatement for air void specification outlined in SROH 2nd Edition?

Read Answer


S10.2.3 Bituminous Materials – Rounding of Air Voids Test Results

Date Submitted: July 2012

Question:

In respect of the testing for Air Voids, the SROH CoP (2nd Edition) stated under S10.2.3(2):  “The overall accuracy of this test measurement is deemed to be ±0.5%”

Under the SROH CoP (3rd Edition), this statement was omitted and this has led to some Highway Authorities issuing air void failures for any result above the whole number in Table S10.1.

Testing results measured to ±0.5% is in line with normal Laboratory procedures against a Specification Limit set out in whole numbers – Tables S10.1 under respective 2nd and 3rd editions specify Air Voids limits as whole numbers.

Will the Working Party confirm whether the ±0.5% accuracy is applicable under the SROH CoP (3rd Edition).
Read Answer


S11.5 Access Covers, Frames and Surrounds

Date Submitted:

Question:

Can it be confirmed that the requirements of Section 11.5 Access Covers, Frames and Surround are only applicable to access covers greater that 600 mm dimension?  A number of Highway Authorities contend that it also applies to small covers, such as stop-cock boxes, hydrants and the like.
Read Answer


S12.1.2 - Remedial Works

Date Submitted: December 2011

Question:

Why is S12.1.2 in the SROH? If the reinstatement is failing on performance/tolerance levels a HA uses the SROH to Defect.  So when would S12.1.2 be looked at?
Read Answer


Minimum thickness of concrete surfacing in a rigid footway

Date Submitted: 8 October 2010

Question:

A query has been received by the SROH Working Party in respect of the minimum thickness of concrete surfacing in a rigid footway.  In the 3rd Edition, Section S8.3.5 and Appendix A7.2 both prescribe ‘match existing’, whilst Table A2.3 requires a minimum (single) lift thickness of 100mm.  Which prevails, in instances where the existing thickness is less than 100mm?
Read Answer


Minimum thickness of concrete surfacing in a rigid footway

Date Submitted: 8 October 2010

Question:

A query has been received by the SROH Working Party in respect of the minimum thickness of concrete surfacing in a rigid footway.  In the 3rd Edition, Section S8.3.5 and Appendix A7.2 both prescribe ‘match existing’, whilst Table A2.3 requires a minimum (single) lift thickness of 100mm.  Which prevails, in instances where the existing thickness is less than 100mm?
Read Answer


Code of Practice - Specification for the Reinstatement of Openings in Highways (Third Edition, 2010)

Date Submitted: August 13th 2010

Question:

Error regarding testing procedure outlined in the 3rd edition of SROH Code of Practice
Read Answer


© Copyright Highways Authorities & Utilities Committee
Cookie Policy