透水模板对矿粉混凝土性能的影响研究

发布时间：2018-06-10 12:33

本文选题：矿粉混凝土 + 透水模板　；参考：《青岛理工大学》2015年硕士论文

【摘要】：随着混凝土结构应用越来越广泛,混凝土的耐久性问题也得到了土木工程界的广泛关注与持续研究。使用活性矿物掺合料在提高混凝土性能的同时,也减少了能源消耗,保护了环境。透水模板也是提高混凝土结构耐久性的一种技术。许多学者对掺加矿粉和透水模板单独作用下混凝土性能改善方面做了大量研究,但是关于透水模板对掺加矿粉混凝土性能改善的研究很少,使得透水模板的应用受到了限制。本文主要从两个方面研究透水模板对掺加矿粉混凝土性能的改善作用:一是研究透水模板对未掺和掺加矿粉混凝土表层胶凝材料颗粒积累运动和胶凝材料颗粒分布的影响,定量分析距离混凝土表面不同深度处水化情况;二是研究透水模板对未掺和掺加矿粉混凝土耐久性能的影响。本文对两种配合比、两种模板制得的试块进行以下五种试验:氢氧化钙含量测定试验、混凝土饱和吸水试验、混凝土强度回弹试验、混凝土毛细吸水试验、混凝土冻融循环试验。试验结果表明:(1)透水模板对掺加矿粉混凝土表层水泥水化有促进作用,标养和自然养护条件下分别提高了3.5%和4%左右,而且影响深度提高较大,普通模板的影响深度一般为10mm左右,而透水模板对水泥水化的影响深度在20mm左右。(2)透水模板对掺加矿粉混凝土的耐久性能提高显著。抗压强度方面,C+K-PMF-1试块比C+K-PMF-0试块在自然养护和标准养护条件下分别提高了6%和13.2%。抗渗性方面,C+K-PMF-1试块孔隙率比C+K-PMF-0试块在自然养护和标准养护条件下分别减小了28.2%和33.9%;C+K-PMF-1试块表面毛细吸水量比C+K-PMF-0试块在自然养护和标准养护条件下分别减少了9.3%和15.2%;C+K-PMF-1试块核心面毛细吸水量比C+K-PMF-0试块在自然养护和标准养护条件下4.5%和3.5%。抗冻性方面,在经过相同冻融循环次数后C+K-PMF-1试块比C+K-PMF-0试块的失重率有所降低,相对动弹性模量有所提高。
[Abstract]:With the application of concrete structures more and more widely, the durability of concrete has been widely concerned and continuously studied in civil engineering field. The use of active mineral admixtures not only improves the performance of concrete, but also reduces the energy consumption and protects the environment. Permeable formwork is also a technique to improve the durability of concrete structures. Many scholars have done a lot of research on the improvement of concrete performance under the separate action of mineral powder and permeable formwork, but there are few researches on improving the performance of concrete mixed with mineral powder with permeable formwork, which limits the application of permeable formwork. This paper mainly studies the effect of permeable formwork on the performance of concrete mixed with mineral powder from two aspects: one is to study the effect of permeable formwork on the accumulation and movement of surface cementing material and the distribution of cementing material in the surface layer of unadulterated and mixed mineral powder concrete. Quantitative analysis of hydration at different depths from the surface of concrete; second, the influence of permeable formwork on the durability of unadulterated and mixed concrete. In this paper, the following five kinds of tests were carried out on the samples made of two kinds of mix ratio and two kinds of formwork: calcium hydroxide content test, concrete saturated water absorption test, concrete strength rebound test, concrete capillary water absorption test. Concrete freeze-thaw cycle test. The experimental results show that the permeable formwork can promote the hydration of concrete surface cement with mineral powder, which increases by about 3.5% and 4% respectively under the conditions of standard culture and natural curing, and the influence depth is greatly increased. The influence depth of common formwork is generally about 10mm, while the influence depth of permeable formwork on cement hydration is about 20mm. 2) the durability of concrete mixed with mineral powder can be improved significantly by permeable formwork. The compressive strength of CK-PMF-1 is 6% higher than that of CK-PMF-0 under natural and standard conditions. In terms of impermeability, the porosity of C K-PMF-1 specimen is 28.2% lower than that of C K-PMF-0 sample under natural and standard curing conditions, and the capillary water absorption of C K-PMF-1 specimen is lower than that of C K-PMF-1 sample under natural and standard curing conditions, respectively. The capillary absorptivity of C K PMF 1 and C K PMF 1 was 4.5% and 3. 5% under natural and standard conditions. In the aspect of frost resistance, the weight loss rate of CK-PMF-1 sample was lower than that of CK-PMF-0 sample after the same freeze-thaw cycles, and the relative dynamic elastic modulus was increased.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU528

【共引文献】