ผลกระทบของนำบาดาลทมผลตอคณสมบตของคอนกรตกรณศกษา : อำเภอปากชม จงหวดเลย

The objective of this research were to: 1) The Study effects of ground water on the properties of concrete. The Study the feasibility of using groundwater as a concrete mix in Pak Chom District Loei Province. The Research methods using the time of setting and the ultimate compressive strength test of the concrete. The testing acidity and alkalinity, the hardness and sulfate content in groundwater. This is a groundwater source by selecting 7 groundwater wells in Pak Chom District Loei Province. The results of the study found that: The Groundwater has a concrete formed period in Chom Charoen Subdistrict Administrative Organization. The groundwater had the highest pH value of 8.29. For highest sulfate value had Khamphi Subdistrict Administrative Organization had 30.4 milligrams per liter and and Kon Sa Subdistrict Municipality had the highest hard water value at 550 milligrams per liter and formed period in the maximum setting time is 130 minutes from the start of mixing the cement paste and making the setting time slower than which is 80 minutes. The study results found that: The groundwater and tap water have a pH value of more than 7.00 and are highly alkaline, The effect between formed period in the initial formation period is increased. The study results found that: The compressive strength of concrete and the pH of the sample water used in the test were pH 7.39-8.29. The higher alkalinity results in lower compressive strength. For the values of sulfate found that between 2.30-30.40 milligrams per liter. Which is less than 1,000 milligrams per liter will not affect the compressive strength of concrete. And the study results found that: The hardness of groundwater and tap water are between 74-550 milligrams per liter. The hardness of groundwater is more than 500 milligrams per liter. This will result in increased compressive strength of concrete in 14 days. But from testing the groundwater sample of well 2, the Kon Sa-mi Subdistrict Municipality Office found that the highest compression force was 241 kilograms per square centimeter. This is greater than the compressive strength of tap water samples at 232 kilograms per square centimeter.