碳化混凝土中不同深度处pH值变化规律研究
发布时间：2018-07-27 13:48
【摘要】：采用浸取法和挤压法对碳化混凝土不同深度处pH值变化规律展开研究。考虑了水胶比、水泥用量和粉煤灰用量3个因素对碳化混凝土不同深度处pH值的影响。实验结果表明,碳化混凝土存在部分碳化区、完全碳化区和未碳化区。水胶比对碳化混凝土不同深度处pH值影响不大,而粉煤灰和水泥的用量对碳化混凝土不同深度处pH值有较大的影响;水泥用量对部分碳化区的长度影响较小,粉煤灰的使用对混凝土碳化有促进作用,但减小了部分碳化区的长度。采用挤压法得到的结论与浸取法的结果一致。但是挤压法所得到的孔溶液pH值更可靠,更具有说服力。因此采用挤压法对碳化混凝土不同深度处的pH值进行研究比较合理。
[Abstract]:The variation of pH value of carbonized concrete at different depths was studied by means of leaching and extrusion. The effects of water / binder ratio cement content and fly ash content on pH value of carbonized concrete at different depths were considered. The experimental results show that carbonation zone, complete carbonization zone and uncarbonized zone exist in carbonized concrete. Water / binder ratio has little effect on pH value at different depth of carbonized concrete, while the amount of fly ash and cement has great influence on pH value of carbonized concrete at different depth, and cement content has little effect on the length of carbonized zone. The use of fly ash can promote the carbonization of concrete, but reduce the length of partial carbonization zone. The results obtained by extrusion method are consistent with those obtained by leaching method. However, the pH value of pore solution obtained by extrusion method is more reliable and persuasive. Therefore, it is reasonable to study the pH value of carbonized concrete at different depths by extrusion method.
【作者单位】： 苏州混凝土水泥制品研究院江苏省高耐久混凝土工程技术研究中心;中国建筑材料科学研究总院;
【基金】：绿色建材国家重点实验室开放基金项目(YA-533)
【分类号】：TU528
本文编号：2148024
[Abstract]:The variation of pH value of carbonized concrete at different depths was studied by means of leaching and extrusion. The effects of water / binder ratio cement content and fly ash content on pH value of carbonized concrete at different depths were considered. The experimental results show that carbonation zone, complete carbonization zone and uncarbonized zone exist in carbonized concrete. Water / binder ratio has little effect on pH value at different depth of carbonized concrete, while the amount of fly ash and cement has great influence on pH value of carbonized concrete at different depth, and cement content has little effect on the length of carbonized zone. The use of fly ash can promote the carbonization of concrete, but reduce the length of partial carbonization zone. The results obtained by extrusion method are consistent with those obtained by leaching method. However, the pH value of pore solution obtained by extrusion method is more reliable and persuasive. Therefore, it is reasonable to study the pH value of carbonized concrete at different depths by extrusion method.
【作者单位】： 苏州混凝土水泥制品研究院江苏省高耐久混凝土工程技术研究中心;中国建筑材料科学研究总院;
【基金】：绿色建材国家重点实验室开放基金项目(YA-533)
【分类号】：TU528
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