为了确保混凝土的质量，在生产过程中，定对混凝土原材料进行质量检测，全部

In order to ensure the quality of concrete, in the production process, given the quality of the concrete raw materials testing, all meet the technical performance indicators and then applied. Quality of raw materials and fluctuations have a greater impact on the quality of concrete and applied technology. For example, fluctuations in the strength of cement, there will be a direct impact on the strength of concrete; particle content levels change, resulting in changes in the concrete gradation, and affect the workability of the fresh concrete, aggregate changing the water content, water-cement ratio concrete impact on particularly large. If clay, sand silt content exceeds 3%, the content of gravel, pebbles than 2%, these very fine layer of wrapping material is formed on the surface of the aggregate, cement will interfere with the adhesion of aggregate knot. They appear in loose particulate state, greatly increases the water requirement. As used in the process of mixing concrete swamp water organic impurities, water and other concrete mixing, will form efflorescence on the concrete surface.

In order to ensure the quality of concrete, in the production process, the quality of the concrete raw materials, all in line with the technical performance indicators before the application. The quality of raw materials and their fluctuations have a great impact on the quality of concrete and the application process. For example, the up and down fluctuation of cement strength will have a direct impact on the strength of concrete, and changes in particle content at all levels will lead to changes in concrete grade, and affect the susceptibility and ease of new mixed concrete, aggregate moisture content is constantly changing, the water-grey ratio of concrete is particularly large. If the content of clay and silt in the sand exceeds 3% and in the gravel and pebbles by more than 2%, the parcel layer formed by these very fine grain materials on the surface of the aggregate will prevent the bonding of the aggregate and cement stone. They appear in a loose particle state, greatly increasing water demand. If the process of stirring concrete is using organic impurities of swamp water, sea water and other mixed concrete, will form a salt cream on the concrete surface.

In order to ensure the quality of concrete, in the process of production, the quality of concrete raw materials must be tested, all in line with the technical performance indicators before application. The quality and fluctuation of raw materials have great influence on concrete quality and construction technology. For example, the fluctuation of cement strength will have a direct impact on the strength of concrete; the change of particle content at all levels will lead to the change of concrete gradation, and affect the workability of fresh concrete. The water content of aggregate will change constantly, especially the water cement ratio of concrete. If the content of clay and silt in sand is more than 3% and that in gravel and pebble is more than 2%, the wrapping layer formed by these very fine materials on the surface of aggregate will hinder the bond between aggregate and cement stone. They appear as loose particles, which greatly increases the water demand. If the marsh water and sea water with organic impurities are used in the process of concrete mixing, salt frost will form on the concrete surface.<br>