碳化混凝土中不同深度處pH值變化規(guī)律研究
[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(shù)研究中心;中國(guó)建筑材料科學(xué)研究總院;
【基金】:綠色建材國(guó)家重點(diǎn)實(shí)驗(yàn)室開放基金項(xiàng)目(YA-533)
【分類號(hào)】:TU528
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