A treatise on concrete, plain and reinforced : materials, construction, and design of concrete and reinforced concrete; 2nd ed. . ment and thecuriing of the edges of the pat from the glass while the pat still adheres,which is often coincident with the expansion. In the air pats these cracksare developed in nine-tenths of the pats adhering to the glass, and unlessvery decidedly marked are not dangerous. They should not exist in thewater pats. If they do exist, however, to an appreciable extent, it denotesthe presence of a too great proportion of expansives, which ordinarily issufficient to cond
A treatise on concrete, plain and reinforced : materials, construction, and design of concrete and reinforced concrete; 2nd ed. . ment and thecuriing of the edges of the pat from the glass while the pat still adheres,which is often coincident with the expansion. In the air pats these cracksare developed in nine-tenths of the pats adhering to the glass, and unlessvery decidedly marked are not dangerous. They should not exist in thewater pats. If they do exist, however, to an appreciable extent, it denotesthe presence of a too great proportion of expansives, which ordinarily issufficient to condemn the sample. Fig. ;^T, shows blotching, a pat which is usually indicative of either adul-teration or under-burning. This condition in itself should not necessarilymean rejection, but should always induce an investigation of the causesproducing it, which may or may not be sufficient to warrant rejection. Fig. 34 shows pats which have left the glass (A) by mere lack of ad-hesion, (B) by contraction, and (C) by expansion. (.4) is never dangerous ?Presented to the authors by Mr. W. Purves Taylor. 104 A TREATISE ON CONCRETE.
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