安徽理工大学土木楼施工进度管理及乳胶粉对砂浆性能的影响

发布时间：2018-07-17 19:54

【摘要】：近年来随着经济的快速发展,我国对人才需求量越来越大,但许多高校基础设施落后,为提高办学质量、科研水平,建设新校区是解决高校发展瓶颈的有效手段。本文在此背景下,以安徽理工大学新校区土木楼为例,研究了现代施工进度管理技术,根据工程特点、技术难点,提出保证进度的措施,根据工程资源条件,编制了施工进度,绘制甘特图。根据施工现场外墙保温工程,针对外墙保温砂浆存在的缺陷,提出使用乳胶粉对外墙保温砂浆进行改性处理,并进行了不同乳胶粉掺量下外墙保温砂浆的抗折、抗渗和抗裂性能试验,探讨能够同时满足抗折、抗渗和抗裂要求的较优乳胶粉掺量,为现场施工提供一定的试验基础。其中,乳胶粉采用内掺方式等量替代水泥用量的0%、0.5%、1.5%、3.0%、4.5%和5.5%。主要结论如下:(1)为保证按期交工,提出了保证措施,设计变更是设计阶段对施工进度影响的最大因素,所以要尽量减少设计变更。在设计阶段应周全考虑工程项目的施工条件,积极与施工方协调技术问题,减少设计变更给项目进度带来的影响。(2)乳胶粉掺量的增加有助于改善外墙保温砂浆的脆性;掺加乳胶粉后外墙保温砂浆的抗折强度均高于普通砂浆,随着乳胶粉掺量的增加,外墙保温砂浆的抗折强度呈现出先增加后减小的趋势,当乳胶粉掺量为4.5%时,砂浆的抗折强度为3.02MPa,相比普通砂浆提高了 25%。(3)乳胶粉掺量为0%时,渗水高度达到150mm,说明未掺加乳胶粉的外墙保温砂浆抗渗性能较差;当乳胶粉掺量达到1.5%时,抗渗性能有明显提升,平均渗水高度为81mm,乳胶粉掺量达到3%时,平均渗水高度最低,仅为57.2mm,能取得较好的抗渗效果;乳胶粉掺量达到4.5%时,平均渗水高度为62.5mm;乳胶粉掺量为5.5%时,平均渗水高度为135.5mm。因此,乳胶粉掺量在3%-4.5%能取得较好的抗渗效果。(4)乳胶粉掺量为4.5%的抗裂试件抗裂性能优于不掺乳胶粉试件。乳胶粉掺量为0%时,肉眼可见裂缝较多,裂缝宽度较大,抗裂效果明显较差;乳胶粉掺量为0%时最大裂缝宽度为0.7mm,最大裂缝长度为180mm,而乳胶粉掺量为4.5%时,最大裂缝宽度为0.2mm,最大裂缝长度为32mm;乳胶粉对外墙保温砂浆早期抗裂强度有较好的改善。
[Abstract]:With the rapid development of economy in recent years, the demand for talents in our country is increasing, but many universities' infrastructure is backward. In order to improve the quality of running a school, the level of scientific research, the construction of a new campus is an effective means to solve the bottleneck of the development of colleges and universities. In this context, taking the civil building in the new campus of Anhui University of Technology as an example, the modern construction schedule management technology is studied. According to the characteristics and technical difficulties of the project, the measures to ensure the progress are put forward, and the construction schedule is compiled according to the conditions of the engineering resources. Draw a Gantt chart. According to the external wall insulation engineering of the construction site, aiming at the defects of the external wall insulation mortar, the paper puts forward that the external wall insulation mortar should be modified with latex powder, and the external wall thermal insulation mortar with different emulsion powder content can resist the fracture. The experiment of impermeability and crack resistance is carried out to find out the optimum amount of latex powder which can meet the requirements of anti-fracture, anti-seepage and anti-cracking at the same time, so as to provide a certain test basis for field construction. Among them, the emulsion powder was replaced by the same amount of cement with the same amount of cement, 0.5% and 1.5% and 3.5% and 5.5% respectively. The main conclusions are as follows: (1) in order to ensure the completion of the work on time, the guarantee measures are put forward. The design change is the biggest factor that affects the construction schedule in the design stage, so the design change should be reduced as much as possible. In the design stage, the construction conditions of the project should be considered fully, and the technical problems should be actively coordinated with the constructors to reduce the impact of the design changes on the progress of the project. (2) the increase of latex powder content will help to improve the brittleness of the external wall insulation mortar; The flexural strength of external wall insulation mortar after adding latex powder is higher than that of ordinary mortar. With the increase of emulsion powder content, the flexural strength of external wall insulation mortar increases first and then decreases. The flexural strength of mortar is 3.02 MPa, which is 25% higher than that of ordinary mortar. (3) when the amount of emulsion powder is 0, the permeation height reaches 150 mm, which shows that the external wall insulation mortar without emulsion powder has poor impermeability, and when the amount of emulsion powder reaches 1.5%, The impermeability is obviously improved, the average percolation height is 81mm, when the amount of latex powder reaches 3, the average percolation height is the lowest, only 57.2 mm. The average percolation height was 62.5 mm and the average percolation height was 135.5 mm when the emulsion powder was 5.5 mm. Therefore, a good anti-seepage effect can be obtained when the amount of latex powder is between 3% and 4.5%. (4) the anti-cracking performance of the anti-crack specimen with the content of 4.5% latex powder is better than that of the non-emulsion powder sample. When the amount of latex powder is 0, the cracks are more visible to the naked eye, and the crack width is larger, and the anti-crack effect is obviously poor. The maximum crack width is 0.7 mm, the maximum crack length is 180 mm, and the emulsion powder content is 4.5 mm, when the amount of emulsion powder is 0, the maximum crack width is 0.7 mm, the maximum crack length is 180 mm, and the emulsion powder content is 4.5 mm. The maximum crack width is 0.2 mm and the maximum crack length is 32 mm.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU722;TU578.1

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