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imitation stone guardrails often encounter sun and rain exposure. Imitation bluestone guardrails are high imitation stone products with high strength, long service life, easy installation, and sturdy and reliable. Its anti-corrosion, water resistance, flame resistance, and weather resistance far exceed natural stone, with a delicate and realistic appearance and a unique and elegant shape. Compared to natural stone railings, imitation bluestone railings are much cheaper. How to prevent cracking in daily life? Let's share several methods with everyone< br />
1. Use low or medium heat of hydration cement to prepare concrete, such as slag silicate cement, composite cement, volcanic ash silicate cement, fly ash cement, etc< br />
2. Fully utilize the characteristics of concrete, achieve high strength in the later stage, and reduce the amount of cement used per cubic meter of concrete. According to the experiment, for every increase or decrease of 10 kilograms of cement, its hydration heat will cause the temperature of the concrete to rise or fall by 1 degree Celsius< br />
3. Use coarse aggregates, preferably with larger particle size and better grading; Control the mud content of sand and gravel; Adding fly ash and other admixtures, or adding corresponding water reducing agents, retarders, etc., to improve workability and reduce the water cement ratio, in order to achieve the goal of reducing cement consumption and lowering hydration heat< br />
4. Pre embed cooling water pipes inside the foundation and introduce circulating cooling water to forcibly reduce the hydration heat temperature of concrete< br />
5. In thick and large volume concrete without reinforcement or with few reinforcement, add large stones with a total amount not exceeding 20% to reduce the amount of concrete used, in order to save cement and reduce hydration heat< br />
6. When mixing concrete, an appropriate amount of micro expansion agent or expansion cement can be added to compensate for shrinkage and reduce temperature stress in the concrete< br />
7. Improve reinforcement. In order to ensure that there are temperature bars above and below each pouring layer, it is recommended that the designers make appropriate adjustments to the distribution bars. The temperature reinforcement should be distributed finely, generally usingφ 8 steel bars, bi-directional reinforcement, with a spacing of 15 centimeters. This can enhance the ability to resist temperature stress. The binding of upper steel bars should be carried out after the pouring of lower concrete< br />
8. Set up post pouring joints. When the plane size of large volume concrete is too large, post pouring joints can be appropriately set to reduce external stress and temperature stress; At the same time, it is also beneficial for heat dissipation and reduces the internal temperature of concrete< br />
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