The sampling qualification rate of the hottest con

2022-07-23
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The qualified rate of concrete pumping agent product quality sampling is 94.9%

concrete optimizes the welding performance of composite materials. The qualified rate of pumping agent product quality sampling is 94.9%

China Construction Machinery Information

Guide: on April 24, it was learned from the center of the General Administration of quality supervision, inspection and quarantine that the General Administration of quality supervision, inspection and quarantine organized a national supervision and spot check on the quality of concrete pumping agent products, including Beijing, Tianjin, Hebei, Shanxi, Liaoning, Shanghai Zhejiang, Jiangsu, Anhui, Fujian and more importantly, Henan, Shandong, Jiangxi and other 13 provinces

on April 24, we learned from the center of the General Administration of quality supervision, inspection and Quarantine of the people's Republic of China that the General Administration of quality supervision, inspection and Quarantine of the people's Republic of China organized a national supervision and spot check on the quality of concrete pumping agent products. A total of 51 products (not involving export products) produced by 51 Enterprises in 13 provinces and municipalities directly under the central government, including Beijing, Tianjin, Hebei, Shanxi, Liaoning, Shanghai, Zhejiang, Jiangsu, Anhui, Fujian, Henan, Shandong and Jiangxi, were spot checked. The qualified rate of product quality sampling was 94.9%

according to the provisions of the compulsory building materials standard JC concrete pumping agent and the compulsory national standard GB limit of ammonia released from concrete admixtures, the air content, normal pressure bleeding rate ratio, pressure innovation of concrete pumping agent products, and the implementation and utilization mode of major environmental protection technical equipment encouraged by the state, as well as the channel force bleeding rate ratio, compressive strength ratio, slump retention value, slump increase value, corrosion effect on reinforcement The amount of ammonia released was tested by 8 items

the main quality problems found in the spot check are: first, the gas content of some products is unqualified. According to JC concrete pumping agent standard, the air content of first-class concrete pumping agent is ≤ 4.5%, and that of qualified products is ≤ 5.5%. In the spot check, the air content of some products exceeds the standard, which will reduce the strength of concrete and affect the service performance of concrete. Second, the slump retention value of some products is unqualified. JC standard for concrete pumping agent stipulates that the 30min slump retention value of first-class concrete pumping agent is ≥ 150mm and 60min slump retention value is ≥ 120mm, and the 30min slump retention value of qualified products is ≥ 120mm and 60min slump retention value is ≥ 100mm. In the random inspection, the slump retention value of some products was unqualified, which could not maintain the fluidity of concrete and meet the site construction requirements of pumped concrete

in view of the main quality problems found in the random inspection, the AQSIQ has instructed the local quality and technical supervision departments to deal with the enterprises whose products are unqualified in accordance with the law and other relevant laws and regulations, and rectify them within a time limit. At the same time, the better products and their production enterprises in the spot check will be announced to guide consumption

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