PURPOSE: To accurately inspect the propriety of the blending level of a gypsum- based expander from the white turbidity of a supernatant of a liquid in which crushed powder of cement fine pieces is immersed in water after a barium solution is added thereto.

CONSTITUTION: Cured fine pieces of an expander-blended cement to be inspected are crushed and a fixed amount of the crushed powder is added to a fixed amount of water and stirred. After the agitation, the solution is allowed to stand for a given time so that water-soluble ions in the crushed powder will be caused to elute. Then, a fixed amount of the supernatant is extracted and a fixed amount of pure water is added thereto and stirred to make a test water. A liquid is prepared for a standard blended cement blended accurately with a fixed amount of an expander on the same condition as said test water and made a standard liquid. After the preparation of the test water and the standard liquid, a fixed amount of a barium chloride solution is added to the same amount of the test water and the standard liquid to produce a white turbidity. Thereafter, the white turbid test water is compared with the white turbid standard liquid.