现浇砼楼板开裂的处理方法与预防.doc

现浇砼楼板开裂的处理方法与预防 现浇砼楼板开裂的处理方法与预防提要：预防现浇砼产生龟裂的主要措施1)在现浇砼楼板的设计上应当在保证强度及高跨比的情况下，尽量采用较低标号的砼强度，砼强度一般不宜超过c25，以减少砼的收缩 更多精品源 现浇砼楼板开裂的处理方法与预防 1、现浇砼楼板产生龟裂的原因现浇砼楼板由于摄露面积大，极易产生砼上表面龟裂。分析其主要原因不外乎设计上砼标号过高；砼收缩较大；原材料质量不好；水泥早期强度快或水泥的安定性不合格。此外在施工艺上砼配合比不准、水灰比过大及砼挠注完毕后的后期养护不好等等原因也极易造成现浇砼楼板的龟裂。 2、预防现浇砼产生龟裂的主要措施 1)在现浇砼楼板的设计上应当在保证强度及高跨比的情况下，尽量采用较低标号的砼强度，砼强度一般不宜超过c25，以减少砼的收缩。 2)在原材料使用上面，水泥应选用水化热较低的水泥，严禁使用安定性不稳定、质量不合格的泥，粗骨辩宜采用表面粗糙、质地坚硬的石料，粗骨料的级配一定耍合格，空隙率小、无碱性反应，有害物质及粘土音量不超过规定，细骨科宜选用缎配合理、古泥量较低的中进行养护七天以上，特别是高温天和大风天时更要注意24小时不问断进行浇水养护。 Measures for the routine management of moral education in Middle SchoolsMethod of conventional management of moral education in middle schoolFirst, the guiding ideology:School moral education is an organic whole of the whole education work, always adhere to the school adhere to the moral education, education for this product, and actively promote the quality education, the school building efficient curriculum system of moral education, moral education, improve the sense of attraction and appeal, enhance the moral education work for through and timeliness. Teach everyone, service education and management education, and school moral education work must be with family education and community education closely together, to form a concerted pattern, and strive to create a good atmosphere for education, and to promote the all-round development of students, to establish a scientific moral education full of vigor the For long-term mechanism.Two, the goal of moral education:To guide the students to form the correct world outlook, outlook on life, values, to cultivate students unity and mutual assistance, honest and trustworthy, law-abiding, good quality, hard work, set a good XX students ideological quality, psychological quality and image quality. The formation of excellent moral education curriculum system and management system, the construction of school. The society, family moral education network, to achieve full member education, environment e