外文翻譯---商品混凝土早期裂縫的成因及防治措施-在線瀏覽
2024-07-24 10:23本頁面
【正文】 hen the hot season in August, the morning of pouring concrete into the cracks began to appear at noon to the afternoon final setting we propose is not part of a second hand light, the cracks disappear (Note: Second hand light to get a good time, before the initial setting due to the role of small, clean after final setting fixed) but the final setting has most of the parts of the cracks perate the plate surface, and was like cracking the evening pouring of concrete by adjusting the ratio, doped with which to remove the sand, has not detected the crack. However, after this site using the same raw material mix and the same two plates and pouring, pouring the morning or afternoon, the emergence of cracks on the cast is basically not found. Different and the same construction of concrete cracks in the ranks of different levels, the construction technology and the environment that conditions on the nonstructural cracks in concrete play a decisive role. 3, the temperature of mass concrete cracks Hydration process of cement hydration have some heat, and most of its heat is released within three days, concrete is a poor conductor of heat, especially the large volume of concrete, resulting in a large number of hydration heat is not easy to distribute, the internal temperature rising , and the concrete surface heat faster, so have a temperature gradient inside and outside the crosssection, especially when the 4 temperature difference between day and night, the temperature difference between inside and outside the greater thermal expansion of concrete deformation of the internal pressure, external concrete shrinkage deformation, resulting in tensile stress, as the concrete in this when the lower tensile strength, internal tensile stress when the concrete tensile strength of more than concrete, the concrete will crack, the crack gap generally deeper, and sometimes a crosscutting nature, the basement of a project for film rib raft foundation beam, rib 900 1600mm beam surface coefficient small, each cement concrete 425 R amp。 P for silicon cement 522kg, high hydration heat of cement, three days after pouringTemplate, in the atmospheric temperature of ℃ , the surface temperature rapidly, the formation of temperature gradient
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