Pebble is formed? Around 100 million years ago in the Mesozoic, the role of crustal movement, magma emerge surface, rapidly cooled lava will form granite. Thereafter dating back thousands of years, since the granite magma intrusion caused dislocation squeeze, resulting in a large number of smaller stones, those stones at the water's edge, after a long period of slow water erosion and their mutual rolling, forming today's cobblestone. Pebble is a very long time, evolving. The relevant provisions of the quality of products must be qualified pebbles, after the test should be used to have a factory quality certification and testing orders. Sampling tests before use in accordance with different varieties and specifications, origin, batch. The pilot project will sand sieve analysis pebbles, clay content, mud content. Pilot project will have a sieve analysis gravel, clay content, mud content, needles, tabular grain content, crushing indicators. For the special requirements for the preparation of concrete pebble pebbles lowest, appropriate projects to test needs to be done. There are the following circumstances, such as the import of pebbles, no certificate of pebbles, gravel quality of suspicion for pebble bearing structure, and must be re-examination, should be re-tested with concrete. Pebble unqualified shall not be used. The need to take certain actions before use of technology, should first meet technical requirements, and subject to the relevant technical director after the signature approval before use. Pebble products factory certification by manufacturers quality inspection departments to provide for the use of units, the provisions of the indicators used to demonstrate product quality has reached. Its main contents include: date of manufacture, inspection department seal, certificate number, species, size, quantity, particle size distribution, density, clay content and other data and conclusions. Information staff should be timely collection, collation, verification gravel factory quality certification and test report card. Its quality certification and test report card should be legible white pebbles, the project is complete, accurate, true and shall Missing or incorrectly, and no unfinished business, and shall not be altered, forged, damaged or random pumping withdraw. Factory as larger quantities and provide certification and less time, do copy (eg copy) for future reference, and should indicate the original card number, storage unit, transcripts time, and should be signed transcripts, transcripts Seal . Quality certification by the remarks column on gravel fill out the use of project construction unit name, the use of the site and so on. White pebbles _ a variety of specifications (certification) _ Zhangjiakou cobbled provided by the Henan water purification Material Co., Ltd. Spirit. Spirit Henan water purification Material Co., Ltd. (www.gyssjs.com) is a leader in Zhengzhou, water treatment chemicals, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Saatchi water in leadership with the staff warmly welcome all inquiries negotiations to create a better future prosperity water.