162 ANNALS NEW YORK ACADEMY OF SCIENCES 



Part II 



Page 



Experimental investigation 184 



Temperature of the water at first added 186 



Temperature of the water that may subsequently come into contact 



with the system 186 



High-pressure steam 186 



Cold storage 187 



Quantity of water at first added 189 



Size of cement particles 189 



Mechanical agitation when water is added 191 



Setting time of cement in laboratory air and in damp closet 192 



Effect of excess of mixing water on strength of concrete 193 



Effect of excess of mixing water on permeability of concrete 191 



Effect of excess of mixing water on strength of neat cement 195 



Effect of the presence of clay and dissolved substances 19S 



Quantity of water that may subsequently come into contact with the 



system 200 



Permeability 200 



Concretes containing different aggregates 204 



Concretes containing different cements 205 



Effect of the direction of flow through concrete 206 



Quality of water at first added 208 



Compressive strength of neat cements gaged with various solutions 208 

 Effect of gaging with various solutions upon the strength of 



mortars afterward stored in water 210 



Effect of gaging grout with rock waters 211 



Quality of water that may subsequently come into contact with the 



system 213 



Theoretical considerations 213 



JEffect of storage in various saline solutions upon the strength of 



<f ' mortar 214 



Effect of storage in rock water upon the strength of lean cement 



mortars 216 



Summary of experimental results 218 



General conclusions 219 



Bibliography 220 



PART I 



Introduction 



The important field of investigation covering the changes which take 

 place in the setting and hardening of Portland cement and in Portland 

 cement which may be considered to have attained the greater part of its 

 maximum hardness calls for the services of experts in various branches 

 of science. Many of the general problems can, as a whole, be relegated 



