水利工程混凝土施工裂缝的产生原因及对策水利工程混凝土施工裂缝的产生原因及对策.docVIP

水利工程混凝土施工裂缝的产生原因及对策 裂缝是水利工程中最严重的危害之一，裂缝的生成不仅影响构筑物的使用功能，并会引发质量安全事故而威胁人类的生命财产安全，导致裂缝形成的原因多种多样，因而对其成因进行深入分析并结合现场情况制定对策对保证水利工程施工质量，更大限度的发挥其经济和社会效益具有深远意义。 Crack is one of the most serious harm of water conservancy project, the generation of cracks not only influence the use function of structures, and can cause quality safety accident and the threat to human life and property security, the cause of crack formation are diverse, and thus to deeply analyze its causes and combined with field condition make countermeasures to ensure the quality of water conservancy project construction, a larger limit to exert its far-reaching economic and social benefits. 一、水利工程混凝土裂缝成因分析 A concrete crack reason analysis, water conservancy project （一）温度因素 (a) temperature factors 温度因素是导致水利工程混凝土裂缝的主要因素，导致温度因素的原因是混凝土内水泥水化热，同时由于水利工程多属大体积混凝土，大量水化热聚集在混凝土内部若不能及时散发则会导致混凝土内外较高温差，继而导致混凝土内外热胀冷缩程度不同而在混凝土表面形成一定拉应力，当该拉应力超过混凝土的抗拉强度极限则会在其表面生成裂缝；同时若施工过程中环境温度发生突然降温等现象，则混凝土内部会出现温度的正负交替，在交替过程中混凝土微孔内水分则变为冷水甚至冰，过冷水在迁移过程中则会产生渗透压力，同时体积发生膨胀则会产生冻胀压力，当以上二者共同作用力超过混凝土的抗拉强度则会在其表面生成裂缝。 Temperature factors are a major factor in the cause of concrete crack of water conservancy projects, the cause of temperature factor is the cement hydration heat in concrete, at the same time due to the water conservancy project belongs to big volume concrete, large heat of hydration in concrete internal if not timely send out will lead to higher temperature difference between inside and outside concrete, which in turn leads to the concrete inside and outside heat bilges cold shrink degree and form a certain tensile stress in the concrete surface, when the tensile stress more than concrete tensile strength limit will be generated on the surface crack; If at the same time the construction process of the phenomenon such as environmental temperature sudden cooling, it can appear inside the concrete temperature alternating positive and negative, in the process of alternating concrete pore specific provisions of the inland waters