Tensile Bond Strength Between Aggregate and Cement Paste or Mortar
Thomas T. C. HSU and Floyd O. Slate
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The tensile bond strength between four types of aggregate and cement paste or mortar was studied in about 1000 tests, and related to the tensile strength of the paste or mortar itself. Direct tensile bond strength between aggregate and paste or mortar was found to be significantly less than the tensile strength of the paste or mortar, and dependent on rock type, surface roughness of aggregate, and water cement ratio. The effects of age, moisture content of specimen during testing, and water-cement ratio on the difference between tensile and compressive strength of paste, mortar, and concrete have been investigated and are discussed. Also, an explanation for the effect of sand on the strength of mortar is given.