It can be prepared by directly crushing natural calcite, limestone, chalk, shell, etc. by mechanical methods (using Raymond mill or other high-pressure mill). Because the sedimentation volume of heavy Calcium Carbonate is smaller than that of light calcium carbonate, it is called heavy calcium carbonate.
Heavy calcium carbonate is abbreviated as heavy calcium. It uses high-quality limestone as raw material and is processed into white powder by a lime mill. Its main component is CaCO3. Heavy calcium has the characteristics of high whiteness, good purity, soft hue and stable chemical composition. Heavy calcium is usually used as a filler. It is widely used in daily chemical industries such as artificial floor tiles, rubber, plastics, papermaking, coatings, paints, inks, cables, construction supplies, food, medicine, textiles, feed, toothpaste, etc. Increase the volume of products and reduce production costs. Used in rubber, it can increase the volume of the rubber, improve the processability of the rubber, play a semi-reinforcing or reinforcing role, and can adjust the hardness of the rubber.
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The scope of application of the ring knife method and the matters needing attention, this method is suitable for the compaction degree detection during the construction process, for the stability of fine-grained soil and inorganic binder stability of fine-grained soil density schedule. However, for inorganic binder stabilized fine-grained soil, the age of the test object should not exceed 2 days. The ring knife measures the moisture content of the fine-grained soil: when using the alcohol burning method, the amount of soil used is 15 to 20 grams, using a small aluminum box, drying method requires a large oven, and is suitable for laboratory operations.
The attention of the circular knife method to determine the compaction test method is to first remove the loose part of the compacted layer and dig it to a certain depth before inserting the ring cutter into the soil. Then insert the ring knife into the ring. This is because the ring cutter height is much smaller than the thickness of the compacted layer of the structure, and the compaction degree of the compaction layer decreases with depth. Therefore, when the density of the compacted layer is measured by the ring knife method, the ring cutter must be Into the middle of the compacted layer, the measured compaction is considered to represent the average degree of compaction of the entire compacted layer.
Secondly, the ring knife must have a certain rigidity and be straight so as to ensure that the flattened soil sample is flush with the upper and lower mouths of the ring knife, and there must be no unevenness.
The Role of Ring Knife in Municipal Engineering Test
In the municipal engineering, the compaction test will be carried out frequently and will continue throughout the construction process. This will result in a lot of manpower and material waste. But at the same time, if the project is reworked due to inaccurate testing, it will delay the construction period. The following is a brief analysis of the ring knife test method and it is hoped that it will be helpful to the inspection personnel at the construction site.