碳化混凝土中不同深度處pH值變化規(guī)律研究
發(fā)布時間:2018-07-27 13:48
【摘要】:采用浸取法和擠壓法對碳化混凝土不同深度處pH值變化規(guī)律展開研究。考慮了水膠比、水泥用量和粉煤灰用量3個因素對碳化混凝土不同深度處pH值的影響。實驗結果表明,碳化混凝土存在部分碳化區(qū)、完全碳化區(qū)和未碳化區(qū)。水膠比對碳化混凝土不同深度處pH值影響不大,而粉煤灰和水泥的用量對碳化混凝土不同深度處pH值有較大的影響;水泥用量對部分碳化區(qū)的長度影響較小,粉煤灰的使用對混凝土碳化有促進作用,但減小了部分碳化區(qū)的長度。采用擠壓法得到的結論與浸取法的結果一致。但是擠壓法所得到的孔溶液pH值更可靠,更具有說服力。因此采用擠壓法對碳化混凝土不同深度處的pH值進行研究比較合理。
[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.
【作者單位】: 蘇州混凝土水泥制品研究院江蘇省高耐久混凝土工程技術研究中心;中國建筑材料科學研究總院;
【基金】:綠色建材國家重點實驗室開放基金項目(YA-533)
【分類號】:TU528
本文編號: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.
【作者單位】: 蘇州混凝土水泥制品研究院江蘇省高耐久混凝土工程技術研究中心;中國建筑材料科學研究總院;
【基金】:綠色建材國家重點實驗室開放基金項目(YA-533)
【分類號】:TU528
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