Upon receiving an approved mix design, the Resident Engineer shall forward it to the contractor and request the contractor propose a job-mix formula(JMF). The contractor will submit his proposed JMF to the Resident Engineer for review and approval. After reviewing the proposed JMF and making any necessary corrections, the Resident Engineer will establish the approved JMF and send it to the contractor. The Resident Engineer will also send copies the approved JMF to the SO and SO representative. When distributing the approved JMF, it is helpful to attach a copy of the approved mix design.
The first JMF should be JMF No.1. Sebsequent JMS's must be issued if there is a change in any item shown. Additional JMF's will be numbered with the next subsequent number (i.e, 2, 3, 4, 5,..). When a JMF has been distributed with typos and/or error, the corrected JMF will be a revised JMF. The JMF number will not change. However, a letter "R" will be added to the number (i.e, 1R, 2R, 3R,..). After JMF No. 1, any required changes and/or revision should be in
bold for easy identification.
Contoh 1 : The Resident Engineer completed and distributed JMF No. 1 based on the approved mix design. However, recent test results indicate he needs to adjust the combined percent passing target and job-mix range for two sieves. The Resident Engineer will change the combined percent passing targets on the two sieves and adjust the job-mix range accordingly.
This job-mix will be JMF No.2
Contoh 2 : The Resident Engineer completed and distributed JMF No. 1 based on the approved mix design and later notices that it has the incorrect bitumen ratio. The Resident Engineer will revise the JMF to reflect the correct bitumen ratio and redistribute the JMF as JMF No 1R
Note : Every contract will have its own set of JMF No's. for each approved mix design