在简单的工艺条件下,用少量聚合物对活性粉末混凝土进行改性,将改性后和未改性的活性粉末混凝土进行浸水和浸泡盐酸和硫酸盐溶液的试验,测定其抗折和抗压强度的损失率.结果表明,RPC材料虽然强度也可以较高,但耐水性比不上普通水泥砂浆;经过聚合物改性的RPC,可以明显改善其耐水性能;在耐酸腐蚀方面,经与未经聚合物改性的RPC材料都比普通水泥砂浆优良,聚合物改性的RPC材料更为优异,其90 d泡盐酸的强度损失率仅为8%左右;对于10%Na_2SO_4溶液浸泡的RPC及聚合物改性的RPC材料,其抗折强度先升高后降低,聚合物改性RPC材料的耐硫酸盐腐蚀能力得到改善.最后本文用扫描电镜和能谱图对材料的微观结构进行了研究,以解释其抗侵蚀机理.
Using small amount of polymer and ordinary processing condition to modify reactive powder concrete (RPC),the modified and unmodified RPC have been compared for their corrosion resistance with the tests of water-dip-in, acid-dip-in and sulphate solution-dip-in and verified by the ruptural and compressive strength loss rate. The results showed that although the strength of RPC is so high, its the water-resistant is not better than OPC mortar; but after polymer modification, the water resistance of RPC could significantly improve. In the anti-acid corrosion aspect, RPC and the polymer modification RPC are all much better than OPC mortar,while the polymer modified RPC is even better than RPC and its strength loss rate is only about 8% when dipped in hydrochloric acid for 90 d. When soaked in 10% Na_2SO_4 solution, the flexural strength of RPC and polymer modified-RPC both appear first increase and then decrease, but polymer modified-RPC has a better sulfate corrosion-resistance. To explain the materials erosion mechanism, the microstructure of materials has been studied with SEM and EDS analysis.
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