MASONRY AND CONCRETE DEFINITIONS AND SPECIFICATIONS . 

 CLASSIFICATION OF MASONRY.* 



DEFINITIONS.* 



Masonry, Bridge and Retaining Wall. Masonry of stone or concrete, designed to carry 

 the end of a bridge span or to retain the abutting earth, or both. 



Masonry, Arch. That portion of the masonry in the arch ring only, or between the intrados 

 and the extrados. 



Masonry, Culvert. Flat-top masonry structure of stone or concrete, designed to sustain the 

 fill above and to permit the free passage of water. 



Masonry, Dry. Masonry in which stones are built up without the use of mortar. 



CONCRETE. 



Concrete. A compact mass of broken stone, gravel or other suitable material assembled 

 together with cement mortar and allowed to harden. 



Reinforced Concrete. Concrete which has been reinforced by means of metal in some form, 

 so as to develop the compressive strength of the concrete. 



Rubble Concrete. Concrete in which rubble stone are imbedded. 



BRICK. 

 Brick. No. I. Hard burned brick, absorption not exceeding 2 per cent by weight. 



CEMENT. 



Cement. A material of one of the three classes, Portland, Natural and Puzzolan, possessing 

 the property of hardening into a solid mass when mixed with water. 



* Adopted by Am. Ry. Eng. Assoc., Vol. 7, 1906, pp. 596-601, 619; Vol. 12, 1911. 



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