Bids Are Invited For Regarding Acquisition Of Construction Materials For The Purpose Of Maintenance Of Public Roads And Municipal Buildings.

Sand - Washed Coarse, M³, Medium Sand, M3, Final Washed Sand, Crushed - Primary Crushed (Specifically Refers To The Material That Comes Out Of The Primary Crusher And That Has Not Yet Gone Through Sieving Or Rigorous Selection. It May Have A Coarser And More Varied Granulometry Than The Rachão Commercialized, With Sizes That Vary From 9.5 Cm To 40.5 Cm, With An Average Weight Per Stone From 10 Kg To 12 Kg.), Crushed Stone 1 - The General Characteristics Are As Follows: The Crushed Stone Must Be Made Of Sound Rock, Obtained By Crushing And Classification; It Must Be Hard, Clean And Durable; It Must Be Free From Excessive Lamellar Or Elongated Particles, Which Are Not Soft Or Easily Disintegrated, In Addition To Other Harmful Substances Or Contaminations; The Specific Characteristics Are As Follows: Los Angeles Abrasion = 50 (Dnit 451 Me); Percentage Of Fractured Particles = 90, By Mass, Of The Fragments Retained On Sieve No. 4 (4.8 Mm), Which Must Present At Least One Face Fragmented By Crushing (Dnit 430 Me). Shape Index = 0.5 (Dnit 424 Me) Or = 2.0 (Dnit 425 Me). Percentage Of Flat And Elongated Particles = 25, In A Ratio Of 3:1 (Dnit 429 Me). Durability By Using Sodium Sulfate Solutions With Loss ≪ 12 Or By The Use Of Magnesium Sulfate With Loss ≪ 15 (Dnit 446 Me) Highways (It Is The Stone Produced Shortly After The First Crushing (Primary Crusher), Containing A Mixture Of Sizes, Generally Above 76 Mm, Reaching 150 Mm Or Up To 250 Mm.)