Water used to mix concrete, and maintenance must be clean without salt, oil, grease, sugar sand plant or impurities. Before using the water must be tested according to the standard "RC monolithic structure - Rules and acceptance according to Vietnam Standards-4506-87" Water, rules of construction and acceptance ". The drinking water can be used to be mixed into the concrete, not the plant's waste water, dirty water from the living system, muddy pond water reservoirs, oil and water to mix and concrete maintenance
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