EXPANSIVE COEFFICIENT MEASUREMENT METHOD OF EXPANSIVE MORTAR

PROBLEM TO BE SOLVED: To provide an expansive coefficient measurement method of an expansive mortar capable of simply and accurately measuring an expansive coefficient of an expansive mortar without being limited in measurement location.SOLUTION: An expansive coefficient measurement method includes: a casting step of casting an expansive mortar inside a mold form 2 whose top surface is opened; and a measurement step of obtaining an expansive coefficient of the expansive mortar M. The casting step includes: a mold form setting work for installing the mold form 2 inside a container 3; a water injection work for injecting water W into the container 3; and a sealing work for sealing the container 3. A narrow tube 5 is disposed extending above the top surface of the container 3 from the inside of the container 3. In the water injection work, the water is injected until a water level inside the container 3 becomes higher than the top surface of the mold form 2 and the lower end of the narrow tube 5. In a water sealing work, the container 3 is sealed except for the narrow tube 5 only. In the measurement step, a change Δh of the water level of the small tube 5 is measured.SELECTED DRAWING: Figure 3 【課題】計測箇所が限定されることなく、簡易かつ高精度に膨張モルタルの膨張率を計測することを可能とした、膨張モルタルの膨張率計測方法を提案する。【解決手段】上面が開口した型枠２内に膨張モルタルＭを打設する打設工程と、膨張モルタルＭの膨張率を求める計測工程とを備えており、打設工程は、型枠２を容器３内に設置する型枠設置作業と、容器３内に水Ｗを注水する注水作業と、容器３を密閉する密閉作業とを備えていて、容器３の内部から当該容器３の上面よりも上方に延びる細管５が配管されていて、注水作業では、型枠２の上面および細管５の下端よりも容器３内の水位が高くなるまで注水し、密閉作業では細管５のみを除いて容器３を密閉し、計測工程では細管５の水位の変化Δｈを計測する。【選択図】図３