1 Causes of cracks after application of mass concrete structure construction technology in civil engineering
In the application of mass concrete structure construction technology in civil engineering in China, cracks are easy to appear after mass concrete pouring. In view of this situation, the author analyzes and summarizes the possible causes of concrete cracks, and the results are as follows:
Temperature effect of 1. 1
The application of mass concrete structure construction technology in civil engineering is easily affected by temperature. Therefore, if the external temperature rises during mass concrete pouring, it will easily lead to the appearance of concrete temperature pressure and eventually lead to concrete cracks.
1.2 hydration heat phenomenon of cement
In the application of mass concrete structure construction technology in civil engineering construction, the hydration process of cement will generate heat, and the concrete poured by mass concrete structure construction technology itself is thick, which leads to the heat generated by hydration phenomenon in concrete can not be discharged well, thus leading to the internal and external temperature difference of building concrete itself, and finally leading to concrete cracks in the application of mass concrete structure construction technology.
1.3 autogenous shrinkage of concrete
In the application of mass concrete structure construction technology in civil engineering construction, because 20% water hardening is needed after concrete pouring, some builders often fail to grasp the evaporation of water after concrete pouring, which leads to concrete shrinkage and eventually concrete cracks. In addition, due to the application of mass concrete structure construction technology, some admixtures and slag are often added to the proportion of concrete, which will also lead to mistakes in controlling the water evaporation of building concrete and eventually lead to concrete cracks.
1.4 has strong binding force.
In the application of mass concrete structure construction technology in civil engineering, the concrete poured by this technology is often heavy, which makes the foundation have a greater binding force on pouring concrete, and this external binding force is easy to cause concrete cracks, so the construction personnel need to pay attention to it.
2 the concrete application of mass concrete structure construction technology in civil engineering
In order to effectively solve the problem of concrete cracks in the application of mass concrete structure construction technology in civil engineering in China, the author analyzes the strategies from two aspects: temperature control and improving the crack resistance of concrete itself, hoping to promote the application and development of mass concrete structure construction technology in civil engineering in China.
2. 1 temperature control
In the above article, we learned about the concrete cracks caused by temperature after mass concrete pouring in civil engineering. In view of this situation, we can solve the concrete cracks that often appear in the application of mass concrete structure construction technology through temperature control. In concrete temperature control, we should start from three aspects: 2. 1. 1 cement dosage control. Because cement will generate heat due to hydration after concrete pouring, if the amount of cement can be controlled in the application of mass concrete structure construction technology, concrete cracks can be avoided to a great extent after the application of mass concrete structure construction technology. Therefore, builders can use water reducing agent and mixed materials instead of cement to prevent concrete cracks. 2. 1.2 pouring temperature control. Because the mass concrete pouring process in civil engineering construction is easy to produce cracks due to the inconsistency between the internal and external temperatures of concrete, builders can avoid concrete cracks by controlling the temperature during concrete pouring. Specifically, construction workers need to avoid concrete construction in high temperature weather. If they have to carry out construction in hot weather, they need to be prepared for concrete cooling to effectively avoid concrete cracks. 2. 1.3 application of forced cooling method. In order to avoid concrete cracks caused by inconsistent internal and external temperatures during mass concrete pouring in civil engineering construction, constructors can avoid concrete cracks by forced cooling when necessary. After water pipes are buried in concrete, forced cooling after mass concrete pouring can be realized, and concrete cracks can be avoided.
2.2 Improvement of crack resistance
In the process of mass concrete pouring, construction workers not only control the temperature, but also strive to improve the crack resistance of concrete, which can also effectively solve the concrete crack problem in the application of mass concrete structure construction technology. 2.2. 1 Proportion of concrete materials and application of additives. In order to avoid cracks in the process of mass concrete pouring, builders can ensure that there will be no cracks after mass concrete pouring by ensuring the correct proportion of concrete materials and better using additives. Specifically, the construction personnel should choose concrete proportioning materials in strict accordance with the requirements, mix concrete and carry out specific construction; In the application of additives, builders should add additives to concrete to ensure that the autogenous shrinkage of concrete can be better controlled after pouring. 2.2.2 Application of reinforcement materials and reinforcement. In order to effectively avoid cracks after mass concrete pouring in civil engineering, builders can add organic fiber, metal fiber and inorganic fiber into concrete, which can effectively improve the crack resistance of mass concrete after pouring and ensure the quality of civil engineering.
2.3 Reduction of internal and external binding force
In the above article, we mentioned the problem of concrete cracks caused by the pressure of foundation on mass concrete after pouring. In order to solve this problem, builders can use the sliding layer on the foundation and the asphalt or sand cushion on the concrete to ensure the free deformation of mass concrete after pouring, so as to better prevent the occurrence of concrete cracks in the application of mass concrete structure construction technology.
To sum up, in the application of mass concrete structure construction technology in China, the problem of cracks after mass concrete pouring really restricts the development of China's construction industry. Therefore, combining with my own practical work experience, the author discusses the strategies to solve the problem of concrete cracks, hoping to solve various problems encountered in mass concrete pouring and promote the development of China's construction industry.
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