【文章內(nèi)容簡(jiǎn)介】 with a portable contacting drill within 7 days after the agitated piles are finished preparing to observe the uniformity of agitation, also pile strength shall be checked and judged by number of hitting with the portable contacting drill. Quantity of piles for checking shall not be less than 2% of piles piled. Sampling, single pile load bearing test or digging out test shall yet be done if under the following situation:I．Pile core sample shall be taken and make into test blocks from piles that are suspected to have strength lower than standard and determine the actual strength.II．Piles in plicated site or construction work for piling has problem, single pile load bearing test shall be performed to inspect its load bearing capability.III．For strict engineering project that has strict requirement on overlapping joint of adjacent piles, when piles have been cured till a certain period, several piles shall be dug out to check outside quality of pile top visually. Quantity of points for inspection of high pressure spraying mortar shall be 2~5% of holes that have been sprayed with mortar. For projects whose holes are fewer than 20, at least 2% points shall be inspected. Respraying should be done for those unqualified.2. Construction quality of concrete structure General rules Specification for construction and acceptance of Concrete structure engineering GB 5020492 Construction of concrete structure project shall be performed according to design drawings.Partial construction work of concrete structure shall be performed after the former part has been inspected as qualified. Steel bar shall have quality certificate or test report. Markings shall be tied on surface or at each bundle of steel bars. Acceptance inspection shall be carried out per hot number (batch number) and diameter of bars. Inspection includes marking, visual check, and dynamic property test, only qualified ones can be used.During processing, if steel bar broken due to brittleness, bad welding or unqualified dynamic property is found, chemical position test or other specific test shall be performed. Cement must have quality certificate or test report for acceptance and category, mark number, packed or bulk delivery number, leaving factory date all shall be checked before acceptance.When quality of cement is suspected, or cement left factory more than three months before ( none month for rapidcuring portland cement [silicate]) , a repeat test shall be performed to determine whether it can be used or not.Standard for controlling concrete quality GB 5016492 Safety and strength shall be tested for cement to be used. If required, other properties shall yet be checked. Specification for construction and acceptance of Concrete structure engineering GB 5020492 aggregated materials shall be piled per category and size respectively and not to mix them. Calcinated dolomite or limestone is seriously prohibited to mix in the aggregate.Standard of quality and test method of sand for mon concrete JGJ 5292 For sand used for important concrete in engineering project, alkali activity test shall be done for concentrated material with chemical method or mortar length method. If, through the abovementioned test, it is determined to be potentially harmful, the following measure shall be taken: Use cement that contains water content below %, or use blending material that can inhibit reaction between alkali and concentrated material. When additives that contain potassium and soda ions, special test must be performed. When sea sand is used to prepare concrete, chloride ion content shall meet the following rules: For steel bar reinforced concrete, chloride ion in sea sand shall not be higher than % (based on dry sand weight %, hereinafter use the same rate). When to use sea sand is a must for preparing concrete with prestress, the sand must be flushed with fresh water. Chloride ions in water shall not be more than %.Quality standard and inspection method for mon concrete prepared with spall and pebble JGJ 5392 Spall and pebble used for concrete in important engineering project should be tested for alkali activity.In alkali activity test, first inspect the category, type and amount of alkaliactive aggregate with rockphase method ( the information also can be provided by geological institution). If the aggregate contains active silicon dioxide, chemical method and mortar method shall be used。 if the aggregate contains active carbonate, rock column method shall be used.After the above mentioned inspection, if the aggregate is judged as hazard, and is of alkalicarbonate reaction and if the aggregate must be used, it should be finally evaluated with special concrete testing result.If the potential hazard is of alkalisilicon reaction, only when it meets the following regulation can it be used: Use cement that contains alkali less than %, or use blending material that can inhibit reaction between alkaliaggregate. When additives containing potassium or soda ions, special test shall be performed.Construction and acceptance specification of concrete structure engineering project GB 5020492 Seawater is not allowed to blend reinforced concrete and concrete with prestress.Standard for quality control of concrete GB 5016492 When additive is selected, category and amount of additive shall be determined according to requirement of concrete, processing and weather conditions, properties of raw materials, mixing ratio and suitability of cement by means of test. Additives shall have quality certificate, if necessary, its hazard content of chlorides, sulfates shall be inspected. Only after proved that such content is not harmful to concrete can the additive be used. Additives of different category shall be stored separately and marked. Impurities mixing in during transportation and pollution are prohibited.Technical specification for