What is cement?
Cement is made of limestone and clay as the main raw materials, which are crushed, mixed and ground into raw materials, then sent to a cement kiln to be calcined into mature materials, and then ground into clinker and appropriate amount of gypsum (sometimes mixture or additive). Cement is a kind of powdery hydraulic inorganic cementing material. Mud can be hardened in air after being mixed with water, and the hardening effect is better in water, and materials such as sand and stone can be firmly bonded together.
What are the classifications of cement?
Cement can be divided into portland cement, aluminate cement, sulphoaluminate cement and phosphate cement according to its main components. The most common cement is Portland cement.
How to calculate the price of cement?
Cement is calculated in tons, because its bulk density tends to be stable, which is equivalent to a constant, so it is calculated in tons. Different brands of cement, the price of a ton is different, generally between 300-500 yuan. In addition, cement procurement needs to calculate transportation costs.
How to calculate the dosage of home improvement cement?
The proportion of cement sand is different in different places where cement is used in home decoration. For example, the best proportion of wall tiles is 1:2, and the best proportion of floor tiles is 1:3. In addition, the bricklayer's methods in paving are different, and the dosage of cement mortar is also different. Therefore, it is difficult to accurately calculate the required cement dosage. But the approximate calculation method is: area x paving thickness x cement proportion in cement mortar. When decorating, you can buy less cement first and then buy less cement.
How to buy home improvement cement?
1. Check the production date: there will be a batch number on the side or back of the cement bag to indicate the production date, because the cement is easy to get wet or agglomerate after being left for a long time. Generally, the time from delivery to purchase will not exceed one week, and the implementation standard should be GB 175-2007. Fake because it is produced in a small workshop, there is generally no batch number and no expired packaging.
2. Check the packaging appearance: According to the national standards, the variety, label, factory name and factory number of cement in the cement packaging label are not all unqualified products. You can also look at the binding line and brand label of the package. There is the word "green product" above the paper bag, and the sealing edge of the seal is round and closed. If there are two single-sided paper edges, the package has been opened. The brand label behind the real cement bag is soft in color, and the word fixed point is written in Xiao Zhuan, which is very different from the fake cement.
3. Weighing: Cement can be bagged or bulk. However, the net weight of each bag of bagged cement is 50kg, and it shall not be less than 98% of the marked weight. As long as the total weight of cement is not less than 1000kg, 20 bags can be randomly selected. Requirements for baggage weight must conform to these principles.
4. Color discrimination: observe whether the color is dark gray or dark green, and the cement with yellow-white color (yellow means clinker is raw material, and white means excessive slag content) has relatively low strength. Generally speaking, the normal color of cement should be grayish white. If the color is too dark or changes, it may be that there are too many other impurities.
5. Pinch the handle: Fake cement is not as good as real cement on the handle. Twisting fake cement powder with your fingers, you feel that there are more coarse sand powder, more coarse and hard particles, and there is a phenomenon of wet agglomeration. If it feels a little fine, there is sand and powder, it means that the fineness of cement is normal.
How to transport and store cement?
1. Precautions for cement transportation: The cement used for home improvement is generally measured in tons. Transportation is a big problem, which not only requires transportation costs, but also can easily lead to cement lumps and other problems when it arrives.
2. Precautions for cement entering the site: After the cement enters the site, the deliveryman should provide a list of each batch of cement to the home improvement project manager, indicating the name of the manufacturer, the variety and quantity of cement and the test instructions of the manufacturer, so as to confirm that the batch of cement meets the requirements of standards and specifications in all aspects after test analysis. In addition, each batch of cement entering the site shall be sampled and inspected according to the test procedures, and the results shall be reported to the supervision engineer for approval. Unqualified cement shall not be used.
3. Precautions for cement storage: A warehouse with sufficient capacity, complete dryness, good ventilation, weatherproof and moistureproof should be established in an appropriate place to store cement. The cement crib should be at least 200mm away from the surrounding walls, and a passage with a width of not less than 700mm should be left between the cribs; Bulk cement should be stored in special tanks. When stored, the ground and the inside of the external wall should be moistureproof.
4. Precautions for cement use: cement should be used as soon as possible after it is transported to the construction site. If the cement deteriorates or cannot be used due to moisture or other reasons, it should be transported away from the construction site. Cement should not be stored for a long time. Cement more than three months old must be retested to determine its quality.
5. Treatment of cement hardening due to moisture: Cement hardening due to moisture will reduce or even lose its original strength. Therefore, it is stipulated in the specification that cement that has been shipped for more than 3 months should be re-tested and used according to the test results. Cement caked or hardened by moisture must be screened before use. The screened aggregates are generally used for masonry mortar or plastering mortar in secondary projects after rubbing or grinding. For cement blocks that can be pulverized by one touch or one pinch, the strength grade can be appropriately reduced.
What brand of cement is good?
1, Conch (listed company Anhui Conch Co., Ltd., a large cement/clinker supplier in Asia, a large enterprise group mainly engaged in the production and sales of cement and commercial clinker).
2. South (China Building Materials Group, a large central enterprise, and North Cement/Zhonglian Cement/Southwest Cement form the core of China Building Materials Cement business segment).
3. Dunshi (domestic large-scale dry-mixed mortar production enterprise, national large-scale cement group Tangshan Jidong Cement Co., Ltd. 20 16 Jidong Cement and Jinyu Co., Ltd. cement business merger and reorganization)
4. China Resources (China Resources (Group) Co., Ltd., a large cement enterprise group supported by China Resources, and a large producer of new dry-process cement and clinker in South China)
5. Zhonglian (China United Cement Group Co., Ltd., one of the top ten brands of cement, was established in 1999, and belongs to China Building Materials Group, and is committed to providing customers with high-quality green building materials products).
6. Shanshui (Shandong Shanshui Cement Group Co., Ltd., a famous trademark in Shandong Province, an earlier domestic enterprise engaged in the production of new dry-process cement, and a large national cement enterprise)
7. Huaxin Fortress (1907, huaxin cement Co., Ltd., a famous trademark in Hubei Province, is a listed company with the main cement industry as its axis, and is known as the cradle of China cement industry).
8. Formosa Plastics Mud (Formosa Plastics Mud (Yingde) Cement Co., Ltd., established in Taiwan Province Province 1946, is a high-tech enterprise specializing in large-scale production and sales of cement products/ready-mixed concrete, and one of the top ten brands of cement).
9. Red Lion (Zhejiang Red Lion Cement Co., Ltd., a large enterprise specializing in the production of high-grade cement, a famous brand in Zhejiang Province, a large national cement enterprise and a leading private cement enterprise)
10, Tian Rui (Tian Rui Group Cement Co., Ltd., a famous trademark in Henan Province, is mainly engaged in the development and utilization of limestone and the production/sales of clinker/cement, and is one of the top ten cement brands).
The above is how to buy the home improvement cement brought by Bian Xiao. How to calculate the price of cement? The whole content.