File:Ontario Sessional Papers, 1903, No.43-50 (1903) (14780492472).jpg

Identifier: n09ontariosession35ontauoft (find matches)
Title: Ontario Sessional Papers, 1903, No.43-50
Year: 1903 (1900s)
Authors: ONTARIO. LEGISLATIVE ASSEMBLY
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Contributing Library: Robarts - University of Toronto
Digitizing Sponsor: Ontario Council of University Libraries and Member Libraries

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gravel, sand and Portland cement for the rubble concrete arefirst to be thoroughly and properly mixed to form a matrix or body ofconcrete, into which the la-rge stones of the rubble concrete are to be placed.In construction the matrix is first to be placed in the work; and a layer ofthe same formed, into which the large stones are to be placed by hand.These stones must be placed at least three inches apart, a-nd the spacesbetween them are to be thoroughly grouted or run up solid with the matrixso as to form a compact mass, and any holes or cavities in the work are tobe run up full and flush with Portland cement grout, consisting of two partsof sand and o*ne of cement. The fine concrete facing must be kept at leastsix inches higher than the rubble concrete, and thoroughly united with itso as to form one homogenous mass, all concrete to be placed in the workthe same time as made, and a<ny concrete not so placed will be rejected. The !«()« AND NORTHERN DSTARIO RAILWAY COMMISSION. 39
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40 THE REPORT OF THE TEMISKAMIKG No. 49 sides of the exeavatioii ixw to be cait^fnlly (notected. so as to prevent looseeaith or other materia) from fallinu into and damn.oinjr the works or founda-tions, and the foundations arc to be kept perfeetlv clear of water. Noticeof reuliness to mix concrete is to be jriven to the Enpneer at least threedays before the mj;.terials are ready, and before the laying of the concretework is commenced. In default thereof the Engineer will reject such conCrete so mixed and the Contrator will be required to remove the sameforthwith off the works. The concrete deposited in water will be composed of Portland cementand s md in the proportions of one of cement to one of sand, to whicji willbe rdded tive parts of broken stones such as is used in fine concrete. 71. When the foundations of any structure a-re on rock the Contractorwill be allowed to adopt any plan for his coiferdams that he may desire,provided he is able to lay the foundations dry so as to prope

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