RELATIONSHIP BETWEEN JOINT TENTING OF RESILIENT FLOOR COVERING AND MOISTURE VAPOR EMISSION OF CONCRETE SLAB

Abstract

 Finishing material bonded to the wet slab peels off at high probability. We are researching in order to propose the moisture management index of slab surface. We focused on resilient floor covering and examined the quantitative relationship between adhesive and water content. In addition, we also examined that the relationship between joint tenting of floor covering and water content. As a result, it was shown that the boundary of the water content where the probability of the occurrence of the joint tenting raises at is different, too, when the curing conditions are different. From this result, it was inferred that it is necessary to measure moisture vapor emission, although the measuring methods until now were the method of measuring the moisture content.

 Based on these results, in this journal, we will understand the effects of different curing conditions on the moisture vapor emission and water contained. In addition, the relationship between joint tenting of floor covering and the moisture vapor emission of slab and moisture content of slab was also examined.

 The preliminary experiments were conducted. The contents of the preliminary experiment are to adopt the coefficient of thermal expansion as an index of failure to substitute the occurrence probability of joint tenting, and to examine the relationship between joint tenting and thermal expansion. As a result, the correspondence between the occurrence probability of joint tenting and the thermal expansion is good. It shows that the coefficient of thermal expansion can represent the occurrence probability of joint tenting (reference to Fig. 2).

 The relationship between the coefficient of thermal expansion of the floor covering and the moisture vapor emission from the concrete slab was also examined. The specimen was sized large enough to perform the test (reference to Fig. 4). Concrete was common on site (reference to Table 1). Two types of curing were applied to the specimens (reference to Table 2).

 The method of using the humidity test paper was adopted as the method of grasping the moisture vapor emission adopted. In this method, a test paper that changes color in response to moisture is attached to a concrete surface, and the moisture vapor emission is measured. In this study, a color reader was used as the method of color measurement to determine the color sample value as the moisture vapor emission (reference to Photo 2).

 The transition of the moisture vapor emission and the moisture content was recorded, and the relationship between the two was examined. As a result, we showed that even if the moisture content was the same, the moisture vapor emission was smaller in water sprinkling (reference to Fig. 6, 7, 8).