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MailTribune.com
  • May 14, 1914

  • Robert S. Edwards of Portland of the firm of Edwards & Lansell, chemical engineers who have conducted tests and prepared specifications for the Central Point-Medford section of the Pacific highway, in response to a request from the Mail Tribune, writes as follows concerning the concrete being laid. He pronounces this road the finest concrete road ever built in the west and as good as constructed anywhere in the world:
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  • Robert S. Edwards of Portland of the firm of Edwards & Lansell, chemical engineers who have conducted tests and prepared specifications for the Central Point-Medford section of the Pacific highway, in response to a request from the Mail Tribune, writes as follows concerning the concrete being laid. He pronounces this road the finest concrete road ever built in the west and as good as constructed anywhere in the world:
    Portland, May 13, 1914
    To the Editor:
    Sometime ago you asked me to give you some information concerning the concrete pavement being placed on the Medford-Central Point road, hence, it might prove interesting to some of the readers of your paper to know more about the method of carrying on this work and just why certain materials are being used in this concrete road, and why certain precautions are a necessity in the combining of these materials, so that we may be positive of securing a good and permanent road.
    ...
    First Class Materials
    The materials for construction, cement, sand, gravel or crushed rock, must be first class in every particular. All of these materials must be inspected. These materials must be so put together as to secure a dense concrete, for density as a general rule means impermeability and uniformity, and uniformity gives us permanence and absence of cracking outside the regular standardized construction joint placed in the pavement. The depositing and final treatment of the concrete so made, as it goes into the work, is also of the greatest importance, and the carelessness and neglect in this feature of the work has caused many jobs to go wrong. Careful and intelligent inspection in combining the cement and aggregate and water as well as proper length of time required to mix the same, cannot be insisted upon too strongly. The final protection of the concrete surface and curing or the same by covering with sand and keeping it wet for at least one week, will do more toward making a good hard surface than one can realize.
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