CHAPTER VII.--METHODS AND COST OF LAYING CONCRETE IN

FREEZING WEATHER. 112

Introduction--Lowering the Freezing Point of the Mixing Water; Common

Salt (Sodium Chloride):--Freezing Temperature Chart--Heating Concrete

Materials; Portable Heaters; Heating in Stationary Bins; Other Examples

of Heating Methods, Power Plant, Billings, Mont., Wachusett Dam,

Huronian Power Co. Dam, Arch Bridge, Piano, Ill., Chicago, Burlington &

Quincy R. R. Work, Heating in Water Tank--Covering and Housing the Work;

Method of Housing in Dam, Chaudiere Falls, Quebec; Method of Housing in

Building Work.