Cement slurry mixing apparatus and method of using cement slurry

• US 5,407,299 A
• Filed: 01/19/1993
• Issued: 04/18/1995
• Est. Priority Date: 01/19/1993
• Status: Expired due to Fees

• Current Assignee: John S. Sutton
• Original Assignee: John S. Sutton
• Inventors: Sutton, John S.
• Primary Examiner(s): Britts, Ramon S.
• Assistant Examiner(s): LISEHORA, JAMES
• Application Number:
  US08/005,667
• Time in Patent Office: 819 Days
• Field of Search: 404/72, 404/75, 404/82, 404/108, 404/101, 404/105, 404/110, 404/111, 404/115, 366/2
• US Class Current: 404/75
• CPC Class Codes: B28C 9/04 the plant being mobile, e.g. mounted on a carriage or a set of carriagesB28C5/42, B28C9/004, B28C9/006 take precedence
• CPC Class Codes: E01C 19/47 Hydraulic cement concrete mixers combined with distributing means specially adapted for road building E01C19/025 takes precedence ; concrete mixers per se B28C

Abstract

This invention discloses a high rate, cement slurry mixing system and method which produces a highly dispersed slurry with the lowest possible viscosity in respect to the water cement ratio and the type and amount of chemical dispersant used in the slurry formulation. The slurry so produced is used in soil-cement construction operations and has the advantage of delayed hydration to allow reasonable time for slurry transport, spreading, intermixing with the soil, plus time for grading, shaping and compaction before a significant amount of cement hydration (setting) occurs.

Claims

1. A method of rapid mixing of high solids water cement slurry which is free flowing, highly dispersed, and has an extended and controlled hydration onset period, using such slurry for preparing soil-cement for construction of a base layer for building either roadways, parking lots, taxi ways, runways, aprons, land fill containment bases, or dikes;

comprising the combination method;

wherein the cement content of said soil-cement is taken from at least one of the categories of Portland, self-setting Class C fly ash, and cement blends of fly ash, ground slag, calcined shale, and lime fly ash, and wherein the slurry after having carrier air removed from the incoming cement and having a controlled amount of water added, is thoroughly mixed in an on-site portable mixing system placed at the construction site, which is stationary when in use and including a batch tank, and adding chemical hydration retarder, and circulating said slag through mixing jets in a mixing system and incorporated into soil cement by spreading or spraying prepared slurry onto a surface of a layer of previously prepared base material at a job-site, and by mixing with a traveling mixer into the base material, which in turn is followed by shaping, compacting and grading of the soil-cement to specified grade and plan, and wherein dry powdered cement is mixed with fluid which may be mixing water or formulated slurry from the containment tank, or a combination of both; and

wherein water and recirculated tank fluid are pumped through separate openings; and

where the mixing water passes through a motive fluid nozzle in an eductor; and

where all or part of the recirculated tank fluid is pumped through a by-pass jet containing a ventura throat is placed in line connecting the eductor discharge to the containment tank and wherein the distance between the motive fluid nozzle and ventura throat is adjustable.