2017 Unsealed Metaling Trials in the Mackenzie District SCOTT MCKENZIE ROADING MANAGER
Mackenzie District Overview - Road classifications - Network size. - Wide range of conditions. - Changing land use. - Tourism Growth.
Climatic Conditions
Historic Maintenance - 3 Graders full time on the network, in the latter years reducing to 2 on a (4 weekly cycle). - Straight run AP20 historically used (river or pit source). - Maintenance Spreads favoured over wearing courses - Fine glacial moraine silts blended. - Silty/ clay spread up to 100mm to aid in the reuse of metal in couple of areas.
Maintenance Today - 1 Grader on a 6 weekly cycle using continuous compaction (via walk n roll system). - Sandvik 2000 system. - Grading cycles are outlined in our maintenance contract.
Material Today Standard Metal -AP20 silty/clay blend -AP20 pit run Metal Trials -Weathered (Rotten) Rock - Raw Source - Crushed - Crushed & blended
The Reason for Trials - AP20 silt/ clay mix not performing as well as it could in some areas. - AP20 silt/ clay mix can only be manufactured, carted or spread weather dependant. - Fines being lost, resulting in the existing material being unusable. - Maintenance grading continually required & increasing. - Standard metal ravelling under higher traffic volumes.
The Reason for Trials - Dust issues in summer months given strong northwest winds and traffic volumes. - Innovation looking to better our maintenance and reduce defects in conjunction with our maintenance contractor - Cost efficiency - Best whole of life cost
Historic Trials - Mount Nessing Road Golf Course (dust) - Hamilton Road - Haldon Road Off end of seal in populated - School Road rural areas (dust & maintenance) - Nixons Road - Braemar Road Rural areas where varying - Rollesby Road sources trialled. (maintenance)
Trial Materials
Trial/ Unsealed Performance -Levelling sites established (cross section across road) fixed datum established. -Monitored bi- monthly by our maintenance contractor. Hamilton Road Site 2 Rotten Rock - 3424 from Clayton Rd NOTE: RED Text is measurement missed, so assumed Date Sep/14 Oct/14 Nov/14 Jan/15 Mar/15 Apr/15 Jun/15 Aug/15 Oct/15 Dec/15 Mar/16 Apr/16 Jun/16 Aug/16 Oct/16 Dec/16 Feb/17 Apr/17 Jun/17 Aug/17 BM Datum 10000 10000 10000 10000 10000 10000 10000 10000 10000 10000 10000 10000 10000 10000 10000 10000 10000 10000 10000 10000 LHS Nail on post - RHS Fence Observations BM 1349 1345 1335 1335 1290 1265 1256 1294 1260 1260 1196 1103 1085 1072 1088 1120 1102 1033 1078 1175 0 Peg LHS 1793 1783 1779 1780 1731 1707 1700 1732 1700 1706 1605 1509 1493 1471 1494 1521 1507 1433 1484 1580 15 Peg RHS 1531 1525 1520 1524 1478 1455 1441 1473 1441 1447 1484 1390 1373 1357 1373 1407 1720 1652 1695 1788 Offset 4 2001 1990 1980 1978 1935 1910 1898 1940 1894 1905 1838 1740 1722 1701 1720 1743 1715 1655 1699 1795 4.5 2008 2000 1999 1987 1936 1913 1910 1939 1898 1885 1814 1721 1701 1676 1710 1739 1655 1590 1645 1767 5 1926 1945 1925 1921 1870 1846 1838 1866 1837 1835 1756 1656 1651 1626 1640 1666 1623 1550 1601 1702 5.5 1864 1855 1847 1845 1803 1748 1783 1816 1785 1793 1723 1633 1609 1591 1605 1640 1602 1537 1572 1670 6 1830 1814 1814 1816 1773 1746 1740 1780 1749 1761 1691 1599 1582 1571 1588 1625 1571 1505 1547 1646 6.5 1794 1781 1782 1781 1738 1715 1704 1745 1709 1717 1655 1563 1548 1532 1555 1589 1544 1479 1526 1625 7 1764 1750 1754 1754 1714 1690 1680 1716 1684 1691 1632 1540 1527 1510 1532 1560 1530 1460 1517 1609 7.5 1741 1733 1734 1742 1698 1683 1668 1705 1673 1686 1622 1530 1518 1502 1526 1545 1530 1468 1514 1610 8 1738 1738 1738 1742 1698 1678 1665 1705 1673 1680 1618 1530 1508 1495 1514 1545 1552 1480 1530 1621 8.5 1767 1755 1760 1763 1715 1686 1681 1717 1685 1698 1632 1541 1520 1506 1530 1570 1560 1491 1539 1629 9 1790 1782 1775 1781 1735 1710 1698 1730 1689 1701 1647 1558 1534 1523 1539 1586 1577 1512 1556 1665 9.5 1817 1801 1793 1790 1740 1738 1730 1760 1726 1723 1662 1570 1560 1544 1564 1591 1620 1545 1605 1720 10 1862 1855 1845 1842 1799 1780 1771 1804 1776 1787 1718 1621 1602 1590 1612 1627 1661 1578 1625 1726 10.5 1959 1936 1937 1928 1882 1844 1831 1880 1825 1824 1759 1668 1645 1627 1655 1683 1778 1710 1761 1852 11 2043 2035 2037 2035 1978 1960 1931 1985 1940 1939 1881 1785 1768 1757 1771 1799 1790 1318 1364 1461 Offset Reduced Levels 4 9348 9355 9355 9357 9355 9355 9358 9354 9366 9355 9358 9363 9363 9371 9368 9377 9387 9378 9379 9380 4.5 9341 9345 9336 9348 9354 9352 9346 9355 9362 9375 9382 9382 9384 9396 9378 9381 9447 9443 9433 9408 5 9423 9400 9410 9414 9420 9419 9418 9428 9423 9425 9440 9447 9434 9446 9448 9454 9479 9483 9477 9473 5.5 9485 9490 9488 9490 9487 9517 9473 9478 9475 9467 9473 9470 9476 9481 9483 9480 9500 9496 9506 9505 6 9519 9531 9521 9519 9517 9519 9516 9514 9511 9499 9505 9504 9503 9501 9500 9495 9531 9528 9531 9529 6.5 9555 9564 9553 9554 9552 9550 9552 9549 9551 9543 9541 9540 9537 9540 9533 9531 9558 9554 9552 9550 7 9585 9595 9581 9581 9576 9575 9576 9578 9576 9569 9564 9563 9558 9562 9556 9560 9572 9573 9561 9566 7.5 9608 9612 9601 9593 9592 9582 9588 9589 9587 9574 9574 9573 9567 9570 9562 9575 9572 9565 9564 9565 8 9611 9607 9597 9593 9592 9587 9591 9589 9587 9580 9578 9573 9577 9577 9574 9575 9550 9553 9548 9554 8.5 9582 9590 9575 9572 9575 9579 9575 9577 9575 9562 9564 9562 9565 9566 9558 9550 9542 9542 9539 9546 9 9559 9563 9560 9554 9555 9555 9558 9564 9571 9559 9549 9545 9551 9549 9549 9534 9525 9521 9522 9510 9.5 9532 9544 9542 9545 9550 9527 9526 9534 9534 9537 9534 9533 9525 9528 9524 9529 9482 9488 9473 9455 10 9487 9490 9490 9493 9491 9485 9485 9490 9484 9473 9478 9482 9483 9482 9476 9493 9441 9455 9453 9449 10.5 9390 9409 9398 9407 9408 9421 9425 9414 9435 9436 9437 9435 9440 9445 9433 9437 9324 9323 9317 9323 11 9306 9310 9298 9300 9312 9305 9325 9309 9320 9321 9315 9318 9317 9315 9317 9321 9312 Avg Hgt Avg Hgt Avg Hgt Avg Hgt Avg Hgt Avg Hgt Avg Hgt Avg Hgt Avg Hgt Avg Hgt Avg Hgt Avg Hgt Avg Hgt Avg Hgt Avg Hgt Avg Hgt Avg Hgt Avg Hgt Avg Hgt Avg Hgt 9489 9494 9487 9488 9489 9489 9487 9488 9490 9485 9486 9486 9485 9489 9484 9486 9481 9493 9490 9487 Avg Metal Loss Avg Metal Loss Avg Metal Loss Avg Metal Loss Avg Metal Loss Avg Metal Loss Avg Metal Loss Avg Metal Loss Avg Metal Loss Avg Metal Loss Avg Metal Loss Avg Metal Loss Avg Metal Loss Avg Metal Loss Avg Metal Loss Avg Metal Loss Avg Metal Loss Avg Metal Loss Avg Metal Loss Since 1st Survey Since 1st Survey Since 1st Survey Since 1st Survey Since 1st Survey Since 1st Survey Since 1st Survey Since 1st Survey Since 1st Survey Since 1st Survey Since 1st Survey Since 1st Survey Since 1st Survey Since 1st Survey Since 1st Survey Since 1st Survey Since 1st Survey Since 1st Survey Since 1st Survey -5 2 1 0 0 1 1-2 4 3 3 3 0 5 3 7-4 -1 2 Equiv. Ann. Loss Equiv. Ann. Loss Equiv. Ann. Loss Equiv. Ann. Loss Equiv. Ann. Loss Equiv. Ann. Loss Equiv. Ann. Loss Equiv. Ann. Loss Equiv. Ann. Loss Equiv. Ann. Loss Equiv. Ann. Loss Equiv. Ann. Loss Equiv. Ann. Loss Equiv. Ann. Loss Equiv. Ann. Loss Equiv. Ann. Loss Equiv. Ann. Loss Equiv. Ann. Loss Equiv. Ann. Loss Since 1st Survey Since 1st Survey Since 1st Survey Since 1st Survey Since 1st Survey Since 1st Survey Since 1st Survey Since 1st Survey Since 1st Survey Since 1st Survey Since 1st Survey Since 1st Survey Since 1st Survey Since 1st Survey Since 1st Survey Since 1st Survey Since 1st Survey Since 1st Survey Since 1st Survey -55 7 2-1 0 2 1-2 3 2 2 2 0 2 1 3-2 0 1 9650 -Measurements taken using a laser level. Height in MM 9550 9500 9450 9400 9350 9300 9250 9200 -Results/ Levelling run recorded in an excel spreadsheet. 9600 Sep/14 Oct/14 Nov/14 Jan/15 Mar/15 Apr/15 Jun/15 Aug/15 Oct/15 Dec/15 Mar/16 Apr/16 Jun/16 9150 9100 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10 10.5 11 Offset from Peg (m) Aug/16 Oct/16 Dec/16 Feb/17 Apr/17 Jun/17 Aug/17
Trial/ Unsealed Performance Braemar Road - Ordinary Maintenance Metal Braemar Road - Weathered Rock Maintenance Metal
Rock Source Test
Trial 1 - Wearing Course 100mm with entirely weathered rock crushed to AP40 Clayton road
Trial 2 - Reusing Maintenance Material which has lost its fines Lilybank Road
Trial 3 - AP20 and weathered rock trial through crushing plant
Trial Material Test Results
Trial Issues - Slippery when wet when first laid. - Defects form if good cross fall shape lost. - Increased costs due to cartage and winning material. - Hardness of the rock material. - Not always available close by. - Complaints about vehicles been made dirty when it is damp.
Trial Benefits - Very minimal to no dust - Reduced Maintenance Cost - Higher Resilience - Good stone mosaic running surface - Better interlock - Self healing - Reuse unusable material
Future Trials - Chip sealing of weathered rock material - Further crushing trials varying sizes of material - Trial alternative weathered rock sources - Spreading a clean running course material over wearing courses. - Explore stabilising options.
Conclusion - We will continue to look for further weather rock sources, enhance blended and continue material trials. - The primary material is likely to remain a crushed blended AP20 given availability and accessibility. - Weathered rock it is not likely that it will be used on the entire network given the material sources are currently limited. - We will continue to use of weathered rock material on our network assessing sites on a case by case basis.