Abstract
A technique has been proposed to estimate the strength of cement paste by using the drilling type surface strength tester developed by the authors. In the present paper, firstly a bit tip having regulated size of grains of diamond was used in order to evaluate the inner strength variation of cement paste. It was proved, however, that the variation was mainly resulted from unevenness of the diamond on the bit tip at the early stages of its use. Next, some kinds of improved bit were manufactured, and a bit showing the most stable performance was selected in a selecting test. Another series of drilling tests using cement paste was carried out, and the improvement of the stability of drill speed was confirmed. Based on the test data, a formula for the estimation of compressive strength was proposed.
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