高性能聚合物改性水泥基胶结材料的研究 2015-01-04

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华中科技大学
硕士学位论文
高性能聚合物改性水泥基胶结材料的研究
学位申请人: 孙继成
学 科 专 业 : 结构工程
指 导 教 师 : 徐银芳 副教授
摘 要
本文运用各类常规试验方法和扫描电子显微镜(SEM)、X 射线衍射法对由硅灰和聚合物改性的高性能聚合物改性水泥基胶结材料进行了测试研究。研究内容主要包括对聚灰比和硅灰在胶结材料中所占水泥的比例、水灰比和各类改性剂(乳化剂、消泡剂、减水剂)的掺量对胶结材料性能的影响;对改性后的胶结材料力学性能、工作性能和耐久性能的研究;结合高分子聚合物聚结原理和微观测试法分析高性能聚合物改性水泥基材料的胶结机理和对水泥石的改进机理。
试验结果表明在胶结料中掺入硅灰占水泥比例的 10%时,其效果最佳。聚灰比是影响改性胶结料的重要因素,当聚灰比在 8%~12%之间时,胶结料的力学性能、工作性能和耐久性能都不同的得到了改善,当聚灰比超过 15%时,改性胶结料的力学性能反而降低。试验通过正交设计法对双掺硅灰和聚合物及改性剂改性的胶结料力学性能的测试,得出高性能聚合物改性水泥基胶结材料的配合比和最佳养护制度。
试验还通过对改性胶结料宏观和微观性能的测试,得出由双掺硅灰和聚合物改性的胶结料的综合性能较好,其力学性能、防水性能及抗硫酸盐侵蚀性均优于普通水泥胶砂试件。改性胶结料的水泥石更加密实,孔隙率下降。掺入聚合物改性胶结料的 Ca(OH)2特征峰降低,说明该聚合物与水泥的水化产物发生了化学反应,胶结料内部 Ca(OH)2含量降低。
通过在水泥基材料中加入硅灰和聚合物并综合利用它们各自的优点,可以开发出高性能的聚合物改性水泥基材料,这对发展高性能的新型聚合物改性砂浆(混凝土)并扩大其在工程上的用途具有积极意义。
关键词:
高性能混凝土;聚合物改性水泥基材料;正交设计法;强度;耐久性;硅灰
II
Abstract
In this thesis, cementing material which modified by polymer and silicon fume was
studied by usual way, SEM and XRD. The main contents are to know what the effects of the
ratio of polymer to cement,SF to cement,water to cement and all kinds of other modified
impregnants (such as emulsifiers,defoamer,water-reducing agent) to polymer; and to study
the mechanics performance,working ability and durability of modified cementing material;
and to combine macromolecule polymer polymerization elements and microcosmic testing
way to analysis cementation mechanism and hardened cement pastes of high performance
polymer modified cementing materials.
Experimentation results indicate that cementing materials can get best effect when add
(silicon-cement ratio)SF/C as 10%. Polymer-cement ratio (P/C) is the main factor in modified
cementing materials. Mechanics performance,work ability and durability of the modified
cementing materials were all developed when it between 8% and 12%; test proved that
materials mechanics performance would reduce when polymer-cement ratio(P/C) exceed
15%. Orthogonal test is adopted to analyses all the influence of mechanical properties of
factors modified motors, and put forward the optimal ingredient and curing system of silicon
fume and polymer modified cementing materials.
Results also proved the total performance of modified cement materials which were
modified by silicon and polymer were well. Its mechanics performance, waterproof property
and sulfate attack resistance were all superior to the reference cement motor. Hardened
cement pastes in modified cementing materials were more dense than the reference cement
motor, its porosity was reduced. The XRD of Ca(OH)
2
in all the polymer modified
cementing materials was lower than that of reference cement motor. It is showed that there
was chemical reaction between polymer and hydration product in the cement, reaching to
weaken for the amount of Ca(OH)
2
.Through adding silicon fume and polymer to cementing materials and use their synthesis
advantages, high performance polymer modified cementing materials can be empoldered, it
has positive meaning in developing new type high performance polymer modified motor
(concrete) and enlarging their use in civil engineering.
Keywords: high performance concrete;polymer modified cementing materials;orthogonal;
test designs;strength;durability;silicon fume
作者
phoenix
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