渗透结晶型水泥基防渗材料的制备及防渗机理研究

发布时间：2018-01-16 04:08

本文关键词：渗透结晶型水泥基防渗材料的制备及防渗机理研究　出处：《中北大学》2017年硕士论文　论文类型：学位论文

【摘要】：传统的防渗材料由于毒性大、耐久性差以及和混凝土基体适应性不好等原因较适应建筑业发展需求。渗透结晶型水泥基防水材料(CCCW)作为一种新型、绿色环保的防渗材料,不仅具有抗渗功能,还具有渗透结晶和自修复等多种优良特性,被广泛应用于各种抗渗、防水工程中。本课题通过大量阅读文献,在充分了解水泥基渗透结晶型防水材料的作用机理和应用研究基础上,根据其反应机理选择若干种化学物质和其它的辅助材料,在确定辅助材料掺量基础上,利用正交试验方法,研究不同组分化学材料对防水性能的影响,优化并制备出了一种以硅酸盐水泥及为基础、以矿物掺合料为辅助材料、以化学物质为核心材料的渗透结晶型水泥基防水材料。同时通过X射线衍射、扫描电镜、热重-差热等微观测试手段,对所制备的防水材料防水机理进行微观机理分析,从微观上角度分析所制备水泥基渗透结晶型防渗材料作用机理。本文通过三方面实验研究,得出以下结论:(1)通过水泥净浆物理、力学性能及胶砂力学性能研究,得出制备防渗材料所需的矿物掺合料(辅助材料)最佳掺量比例:硅粉:矿渣:粉煤灰:减水剂=10%:12%:10%:0.4%。(2)通过正交试验,由砂浆抗压强度、砂浆相对渗透系数、砂浆抗氯离子系数及砂浆抗碳化高度四个指标,得到所制备的防渗材料所需的活性化学物质占胶凝材料质量为5.3%;其活性材料组成比例为组分A:组分B:组分C:组分D=10:200:300:20。(3)通过微观形貌分析,添加防渗材料料后,较空白砂浆试件相比,水化产物中出现了更多的针状、棒状的钙矾石、碳酸钙等结晶体及胶凝材料,同时添加防渗材料后,防渗材料中的化学物质能进一步促进水泥水化反应,使得砂浆结构更加致密。
[Abstract]:The traditional impervious materials are more suitable for the development of the construction industry because of their high toxicity, poor durability and poor adaptability to the concrete matrix. As a new type of waterproofing material, the permeable crystalline cement-based waterproofing material is a new type. Green anti-seepage materials not only have anti-seepage function, but also have many excellent properties such as permeation crystallization and self-repair, which have been widely used in various anti-seepage and waterproofing projects. On the basis of fully understanding the action mechanism and application research of cement-based permeable crystalline waterproof material, several kinds of chemical substances and other auxiliary materials are selected according to its reaction mechanism, on the basis of determining the amount of auxiliary material. By means of orthogonal test, the influence of chemical materials of different components on waterproofing performance was studied, and a kind of Portland cement and mineral admixture as auxiliary material was optimized and prepared. The permeable crystalline cement-based waterproofing material with chemical substance as the core material. At the same time, the microcosmic test means such as X-ray diffraction, scanning electron microscope, thermogravimetry and differential heat were used. The waterproofing mechanism of the waterproofing material is analyzed. The mechanism of the cement-based permeable crystalline anti-seepage material is analyzed from the microcosmic point of view. In this paper, three aspects of experimental study are carried out. Draw the following conclusion: (1) through the cement paste physical, mechanical properties and cemented sand mechanical properties. The optimum ratio of mineral admixture (auxiliary material) needed to prepare impervious material is obtained: silica fume: slag: fly ash: water reducer 10: 12: 10: 0.4. 2) through orthogonal test. According to the compressive strength of mortar, the relative permeability coefficient of mortar, the anti-carbonation height of mortar, it is obtained that the active chemical material used in the preparation is 5.3% of the cementitious material. The composition ratio of active material is component A: component B: component C: component D10: 200: 30020.03) after adding impermeable material through microscopic morphology analysis. Compared with the blank mortar samples, there are more needle-like, rod-like ettringite and calcium carbonate crystals and cementitious materials in the hydration products. The chemical in the impervious material can further promote the hydration reaction of cement and make the mortar structure denser.
【学位授予单位】：中北大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU57

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