不同取代率再生骨料混凝土硫酸根离子扩散试验

发布时间：2018-05-13 08:35

本文选题：取代率 + 再生骨料混凝土　；参考：《科学技术与工程》2016年31期

【摘要】：再生骨料混凝土能很好的解决城市建筑垃圾过多、天然骨料资源不足的问题。耐久性对于再生骨料混凝土在实际工程中的应用十分重要,混凝土常常会受到硫酸盐侵蚀而影响其耐久性。通过把0%、30%、50%、70%、100%取代率的再生骨料混凝土放入5%的硫酸钠溶液中,分别侵蚀2、4、6、8、10、12个月,每个侵蚀周期都对样品进行分层取样,采用EDTA络合滴定法检测硫酸根离子含量,从而得出侵蚀12个月后的不同取代率再生骨料混凝土硫酸根离子分布:0%取代率再生骨料混凝土硫酸根离子含量由初始值0.43%增加到2.24%,侵蚀深度为21 mm;30%取代率再生骨料混凝土硫酸根离子含量由初始值0.54%增加到2.66%,侵蚀深度为21 mm;50%取代率再生骨料混凝土硫酸根离子含量由初始值0.61%增加到3.40%,侵蚀深度为24 mm;70%取代率再生骨料混凝土硫酸根离子含量由初始值0.70%增加到3.98%,侵蚀深度为27 mm;100%取代率再生骨料混凝土硫酸根离子含量由初始值0.85%增加到5.02%,侵蚀深度为30 mm;若以0%取代率再生骨料混凝土硫酸根离子含量和侵蚀深度为基准,30%、50%、70%、100%取代率的再生骨料混凝土硫酸根离子含量同比分别增长17.13%、54.14%、81.22%、130.39%;30%、50%、70%、100%取代率的再生骨料混凝土侵蚀深度同比分别增长0%、14.29%、28.57%、42.86%。并结合试验结果,详细分析了不同取代率对于再生骨料混凝土硫酸根离子扩散影响的机理,为再生骨料混凝土在实际工程中的应用提供了借鉴。
[Abstract]:Recycled aggregate concrete can solve the problem of excessive construction waste and insufficient natural aggregate resources. Durability is very important for the application of recycled aggregate concrete in practical engineering. The durability of concrete is often affected by sulfate erosion. By placing in 5% sodium sulfate solution the recycled aggregate concrete with a ratio of 100% to 70%, and eroding the samples for 10 and 12 months, each erosion cycle was stratified to sample the samples, and the sulfate ion content was determined by EDTA complexometric titration. After 12 months of erosion, the distribution of sulfate ion in recycled aggregate concrete was increased from 0.43% to 2.24%, and the depth of erosion was 21 mm ~ 30%. The ratio of reclaimed bone was 20 mm ~ 30%, and the content of sulfate ion in recycled aggregate concrete was increased from 0.43% to 2.24%, and the depth of erosion was 21 mm ~ 30%. The content of sulfate ion in recycled aggregate concrete is increased from 0.54% to 2.66, and the erosion depth is 21 mm ~ 50%. The content of sulfate ion in recycled aggregate concrete increases from 0.61% to 3.40%, and the erosion depth is 24 mm ~ 70%. Sulfate ion content increased from initial value 0.70% to 3.98%, erosion depth of recycled aggregate concrete increased from 0.85% to 5.02% and erosion depth of recycled aggregate concrete increased from 0.85% to 5.02 mm; if recycled aggregate concrete sulfur was replaced by 0%, the content of sulfate ion in recycled aggregate concrete was increased from 0.85% to 5.02 mm. The sulphate ion content of recycled aggregate concrete with 100% replacement rate was increased by 17.13134.14%, 81.220.39%, respectively, and the erosion depth of recycled aggregate concrete with the replacement rate of 54.14% 81.220.39% was increased by 0.14.29% 28.5752.86%, respectively, compared with the same period last year, and the content of sulphate ion in recycled aggregate concrete with 100% substitution rate was increased by 17.133.14%, 81.220.39% and 50%, respectively, and the corrosion depth of recycled aggregate concrete was increased from the same period to last year. Combined with the experimental results, the mechanism of the influence of different substitution rates on the sulfate ion diffusion of recycled aggregate concrete is analyzed in detail, which provides a reference for the application of recycled aggregate concrete in practical engineering.
【作者单位】：新疆农业大学水利与土木工程学院;
【基金】：新疆维吾尔自治区自然科学基金(2014211B021)资助
【分类号】：TU528

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