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Quality Construction & Equipment Plants, Pavers, and Compactors

Quality Construction & Equipment Plants, Pavers, and Compactors. Plants, Pavers, and Compactors By: Rich Wolters, and Dwight Beglau. MnDOT Specifications. Prior to 1958 - no density control on HMA 1958 - 98% Hveem – many problems 1959 - 97% Marshall for 2351 95% Marshall for 2341

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Quality Construction & Equipment Plants, Pavers, and Compactors

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  1. Quality Construction & Equipment Plants, Pavers, and Compactors Plants, Pavers, and Compactors By: Rich Wolters, and Dwight Beglau

  2. MnDOT Specifications • Prior to 1958 - no density control on HMA • 1958 - 98% Hveem – many problems • 1959 - 97% Marshall for 2351 • 95% Marshall for 2341 • 90% Marshall for 2331

  3. Mn/DOT Specs – Continued • 1964 & 1968 Spec Book • 95% Marshall for 2331 & 2341 • 97% Marshall for 2351 (Divided Aggregate) • Ordinary Compaction (judgment) • July 1, 1969 Supplemental Spec • Added 2361 (1/2” max. fine mix) by Ordinary Compaction

  4. 1969, 1970 & 1971 – pilot density projects and analyzed historical for wearing courses Developed statistical concepts MnDOT Density Research

  5. Research and Supplementals • Nondestructive (Backscatter) • 1978 – three methods (% Marshall/Core, Ordinary and Control Strip) • 1978 – Control Strip required unless otherwise noted • 1978 – Intro. Price Adjustment schedule

  6. 1986 QM Era – Testing Standardization • Saturated Surface Dry: SG = B-C • Mechanical – Marshall Compaction • Rotational Base/Beveled Foot • Bottom Line →Increased Density Requirements A

  7. By 1991 - Specs • Control Strip – Pay Factors • Specified Density – now SSD • Ordinary – Nuclear/monitoring for Rolling Pattern • Modified Specified (2340) to SSD • Total Pay Factor = (A) X (B) • % Rice (MTD) • Modified Control Strip for Night Paving

  8. Rolling Equipment • Pre 1958 • 3-wheel steel & small pneumatic • 1958 to late ’60’s • Tandem steel & pneumatic • Air on run (35+) for breakdown

  9. Rolling Equipment • 1970’s to present – evolution of vibratory • Pneumatic rollers almost disappeared except for late fall paving • Pneumatic again for Superpave

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