Always Active Services 1/23/2023

I 1 expected to remain above 50° F (10° C) for 6 hours I 2 • There is no forecast of temperatures below 35° F (2° C) within 24 hours 3 from the time of placement. 4 • The weather is not foggy or rainy. When rain appears imminent, all I 5 placement operations shall cease and the work shall not be resumed until 6 the threat of rain has passed. 7 B. Cold Weather Requirements 1 8 When the ambient temperature is below 50° F (10° C), but will remain above 40° F 9 (5° C) during paving and the substrate temperatures are 50° F (10° C) and rising, 10 the PCSS can be placed only when manufacturer approved accelerators are added 11 to the mix and approval of the Engineer is obtained. 12 13 C. Hot Weather Requirements I14 15 Care should be taken when placing the PCSS when the substrate temperature 16 exceeds 130° F (50° C). Application temperatures of the substrate above 130° F (50° I 17 18 C) should be closely monitored for performance during the course of application. Any observable defects occurring as a result of extreme temperature should be cause for 19 immediate halting of placement operations. I 20 21 Where the ambient paving air temperature is going to exceed 90° F (32° C) then the 22 use of cold water and ice should be considered for the blending operation. Where 23 the provision of cold water or replacing the part of the water requirement with ice is I 24 not possible, then the use of a retarder should be used with the mix. 25 26 8-26.3(2) Surface Preparation I27 The substrate that is to receive the PCSS system shall be cleaned of sand, dirt, dust, 28 rock, or any other debris that could prevent proper adhesion. Cleaning shall be 29 accomplished by power broom, scraping, blowing, washing, or other approved methods I 30 necessary to assure bonding between the PCSS surface course and the substrate. 31 PCSS operations shall not be started until the surface is in a condition as recommended 32 by the manufacturer. I 33 34 8-26.3(2) Damage Substrate 35 All substrate receiving PCSS shall be free of potholes, spalling, or other areas of I 36 structural deterioration. If identified in the plans, or directed by the Engineer, all such 37 areas shall be excavated to a depth where the substrate is structurally sound and 38 repaired with an approved pothole repair method. Structurally deficient areas not 39 identified for repair in the plans shall be reported to the Engineer. I 40 41 8-26.3(3) Mixing 42 The measuring and mixing operation shall be capable of producing a consistent 43 homogeneous mix sufficient to maintain the production levels required for the work. The 44 water and dry blend shall be charged into the mixer and blended to the desired 45 consistency while maintaining effective temperatures to prevent flashing of the mix. Hand I 46 mixing in pails is not permissible. 47 48 8-26.3(4) Placing I 49 PCSS shall be uniformly deposited on the substrate by roto-stator spray equipment. The 50 spray apparatus shall be a device approved by the manufacturer and have the capability I FLEMING BICYCLE CORRIDOR 79 IPW 3767 November 15, 2022