Compositions and methods for reducing the amount of asphalt emulsion needed for recycling and stabilizing roadway materials

    公开(公告)号:US12031041B2

    公开(公告)日:2024-07-09

    申请号:US17154991

    申请日:2021-01-21

    Abstract: A method involving either: determining a first amount of asphalt emulsion required to generate a mixture for roadway material so that the roadway material will exhibit a predetermined strength; or adding a first amount of asphalt emulsion to a road base material to generate a mixture for roadway material and determining a strength of the mixture. The method involves determining an amount of maltene compounds to be mixed with a second amount of asphalt emulsion so that a mixture of the second amount of asphalt emulsion and the amount of maltene compounds used to generate roadway material will exhibit the predetermined strength or the strength, the second amount of asphalt emulsion being less than the first amount of asphalt emulsion. The method involves generating a mixture including the second amount of asphalt emulsion, the amount of maltene compounds, and the road base material.

    METHOD FOR RECYCLING CEMENT-CONTAINING MATERIALS TO PRODUCE RECLAIMED FINES FOR USE IN CEMENT-BASED MATERIALS AND STRUCTURES

    公开(公告)号:US20240190767A1

    公开(公告)日:2024-06-13

    申请号:US18524709

    申请日:2023-11-30

    CPC classification number: C04B18/167 C04B14/06 C04B26/26

    Abstract: An environmentally-friendly substitute for virgin dry cement is provided. The substitute is obtained as reclaimed cementitious fines produced by recycling cement-containing waste materials, such as recycled concrete aggregate and demolished brick structures. The reclaimed cementitious fines are used as cementitious material in new concrete, mortar, cement paste and other cement-containing materials and structures. A recycling method involves obtaining cement-containing waste material, crushing the cement-containing waste material, gathering the crushed cement-containing waste materials, the crushed cement-containing waste materials comprising reclaimed particles derived from said cement-containing waste material; and sorting the crushed cement-containing waste materials by particle size to obtain reclaimed cementitious fines having sizes in a desired particle size range, e.g., 0.1 micron to 200 micron for use as a substitute for virgin dry cement powder. Notably, the crushing/tumbling methodologies used to obtain the reclaimed particles produce significantly less carbon dioxide that the methodologies used to obtain virgin dry cement.

    METHOD FOR RENOVATING A ROADWAY AND MACHINE FOR SIMULTANEOUS SPREADING OF FIBRES AND BITUMEN EMULSION

    公开(公告)号:US20230193569A1

    公开(公告)日:2023-06-22

    申请号:US17923399

    申请日:2021-05-04

    Applicant: COLAS

    Abstract: In a method for renovating a roadway, a first tack coat including a bitumen emulsion, a second coat of fibres and then a third surface coat that is a “clean” bitumen emulsion or includes an anhydrous asphalt binder, is spread by a spreading machine from bottom to top and overlaid on the milled or planed roadway. The fibres are sprayed onto the tack coat and the sprayed fibres having a maximum length of 12 cm, an asphalt mix being subsequently spread over the surface coat, the residual binder of the “clean” bitumen emulsion having a penetrability of less than 40 dmm and a ball-ring temperature greater than 50° C., the ‘clean’ bitumen emulsion including between 30% and 70% bitumen, between 30% and 70% water, and between 0.1% and 10% surfactants, stabilisers and/or additives, the percentages being by weight. The application also relates to a spreading machine.

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