This study is intended to study the properties of the old cement through exposure, moisture, in the laboratory, Faculty of engineering. Ramkhamhaeng University. And when the concrete mixture to test values are compressed pralai found that the concrete is a mixture of old cement is being pralai under concrete, but the concrete is at least pralai strengths up strengths.Pralai has been designed to mix. A value of pralai strengths that are designed for this study is equal to 240 kg per square cm
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