FORMS FOE SPECIFICATIONS, ETC., FOE EOAD MATERIALS. 



27 



IV. Inspection. 



(11) Every facility shall be provided the purchaser for careful 

 sampling and inspection at either the mill or at the site of the 

 work, as may be specified by the purchaser. At least 10 days 

 from the time of sampling shall be allowed for the completion 

 of the 7-day test ; and at least 31 days shall be allowed for the 

 completion of the 28-day test. The 28-day test shall be waived 

 only when specifically ordered.* 



Inspection. 



V. Rejection. 



(12) The cement may be rejected if it fails to meet any of the 

 requirements of these specifications. 



(13) Cement shall not be rejected on account of failure to meet 

 the fineness requirement if upon retest after drying at 100°C. 

 (212° F.) for one hour it meets this requirement. 



(14) Cement failing to meet the test for soundness in steam 

 may be accepted if it passes a retest using a new sample at any 

 time within 28 days thereafter. 



(15) Packages varying more than 5 per cent from the speci- 

 fied weight may be rejected ; and if the average weight of pack- 

 ages in any shipment, as shown by weighing 50 packages taken 

 at random, is less than that specified, the entire shipment may 

 be rejected. 



The cement shall be sampled in accordance with the method de- 

 scribed on page , paragraphs , of these specifications. 



The cement shall be tested in accordance with the methods de- 

 scribed, or referred to, on page of these specifications, 



tests Nos. 



Rejection. 



Method of sam- 

 pling. 



Methods of 

 testing. 



SPECIFICATION FOR PORTLAND-CEMENT CONCRETE FOR WEARING SURFACE. 

 (SUGGESTED CLAUSES FOR COMPOSITION AND CONSISTENCY.) 



The concrete shall be composed of 1 part of Portland cement Composition, 

 and parts of fine and coarse aggregate, measured sep- 

 arately and accurately by volume, and combined in such propor- 

 tions as may be directed by the engineer, so as to give concrete 

 of the greatest density and strength. The concrete shall be 



mixed in the approximate proportions of 1 part cement, 



parts fine aggregate, and parts coarse aggregate. In no 



case shall the parts of fine aggregate be less than t per 



cent nor more than % per cent of the total parts by volume 



of fine and coarse aggregate. 



The consistency of concrete should be such that when deposited Consistency, 



it will settle in a flat mass, but will not flow on the subgrade. 

 No tamping should be required, and no separation of the mortar 

 from the coarse aggregate should occur in handling the concrete 

 or in finishing the surface. 



* The conference recommends that in the application of this clause to 

 working conditions the cement should not be held ordinarily pending tfie 

 results of the 28-day test, but these tests nevertheless should be made 

 Invariably. 



f The figure 30 is suggested. 



J The figure 40 is suggested. 



