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本文阐述了环氧砂浆粘结地脚螺栓的工艺原理及应用前景,并给出了环氧砂浆的配合比,调制方法及施工过程。 相似文献
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Fracture behavior of epoxy mortar was investigated in Mode I fracture using single edge notched beams with varying notch depth and beam thickness. The beams were loaded in both 3-point and 4-point bending. Influence of polymer content and temperature on the fracture behavior of epoxy mortar was studied using uniform Ottawa 20–30 sand. The polymer content was varied between 10 percent and 18 percent of the total weight of the composite. The temperature was varied between 22°C and 120°C. The flexural strength of the polymer mortar increases with increase in polymer content while the flexural modulus goes through a maximum. The critical stress intensity factor (KIC) was determined by several methods including compliance method (based on crack mouth opening displacement) and finite element analysis. The KIC for epoxy mortar increases with increase in polymer content and epoxy mortar strength but decreases with increase in temperature. The critical stress intensity factor of epoxy mortar is represented in terms of polymer content and polymer strength or stiffness. Numerical tests based on random sampling and stratified sampling procedures were performed to substantiate the experimentally observed fracture toughness values of epoxy mortar. 相似文献
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The behavior of epoxy mortar was studied under various curing conditions, temperature and strain rate. The effect of aggregate size and distribution on the mechanical properties of epoxy mortar was also studied. Epoxy mortar with a uniform fine sand was cured at various temperatures to determine the optimum curing condition. The strain rate was varied between 0.01 to 6 percent strain per minute and the testing temperature between 22°C and 80°C. The strength, modulus, and compressive strain-strain relationship of polymer mortar are influenced by the curing method, testing temperature, and strain rate to varying degrees. The influence of test variables on the mechanical properties of epoxy mortar are quantified. Compared to the uniformly graded fine aggregate fillers the gap-graded aggregates produced polymer mortar with better mechanical properties. The compressive modulus and splitting tensile strength of epoxy mortar are related to their compressive strength. A new nonlinear constitutive model is proposed to predict the complete compressive stress-strain behavior of epoxy mortar. The constitutive relationship parameters are also related to the testing temperature and logarithmic strain rate. 相似文献
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研制开发了一种高强水性环氧乳液砂浆,确定了水性环氧乳液砂浆的基本组成:水性环氧乳液掺量为5%,促进剂掺量1.25%(相水性环氧乳液的质量百分比),消泡剂掺量为0.3%(水性环氧乳液的质量百分比),并在此基础上加入适量的高效减水剂和保水增稠剂,最终得到了一种性能优良的水性环氧乳液砂浆. 相似文献
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添加石英砂尾矿以及白炭黑制备环氧地坪材料,通过适当调节固化剂以及白炭黑、石英砂尾矿之间的配比,以期在一定程度上提高环氧地坪材料的硬度以及各项性能.试验结果表明:使用T-31环氧固化剂,采用涂层方法为中底涂,当水性环氧树脂含量为14 mL时,石英砂尾矿含量为1.2 g,白炭黑含量为1.6 g,环氧地坪材料的硬度可达到3H,耐洗刷次数最多可以达到7800次,耐水性提升到13 d,耐碱性提高到7 d,符合GB/T 22374-2008中优等品的要求,有效提高了环氧地坪涂料的耐磨性和附加值,有望推广应用. 相似文献
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以普通硅酸盐水泥、快硬硫铝酸盐水泥、硅灰和膨胀剂为胶凝材料,再以石英砂为骨料制作灌浆砂浆,通过正交试验设计出高强胶凝材料的最佳配比。最后以上述胶凝材料为基础,粗中细三种砂子为骨料,并添加高性能外加剂,通过改变水和胶凝材料以及胶凝材料和骨料的比例,得到符合标准规范的高性能水泥基灌浆料。掺入快硬水泥有快硬早强的效果;为减小灌浆材料的收缩可以掺入适量膨胀剂;掺入硅灰可以提高灌浆材料的强度。综合考虑灌浆料的流动性,竖向膨胀率以及强度和收缩性的影响,确定灌浆料胶砂比为1.2,水胶比为0.34。研究成果对今后水泥基灌浆材料的发展具有一定的参考价值。 相似文献
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