Placing concrete requires specialized skills and equipment. The licensing requirements for concrete contractors vary from state to state. In some states, concrete contractors need a specific license ...

IN a recent study 1 the strength of the bond between Portland cement paste and sawn aggregate surfaces was found to be less than that of the paste matrix. In some instances therefore, for example in ...

P.E. Pilkington Conoco Inc. Houston Evaluating cement between two strings of casing can be a problem. The signal from the outer string of casing can interfere with amplitude measurement if the inner ...