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采用双氧水做发泡剂制备超轻泡沫混凝土时,双氧水发泡速度较慢,发泡效率较低,不仅导致双氧水用量增大,也导致超轻泡沫混凝土干密度增大。为提高双氧水分解反应速度和效率,对比研究了MnO_2,Fe_2O_3,CuCl_2,Ca(ClO)_2对双氧水的催化效果,以及pH值和温度等因素对双氧水分解速度和效率的影响。试验结果表明,MnO_2对双氧水分解具有显著的促进作用,在MnO_2作用下,双氧水分解速度显著加快,分解率可达93%以上;MnO_2用量超过0.03g/ml后,增加MnO_2用量对双氧水分解速度无显著影响;pH值为7~11时的催化作用具有较为显著的影响,而温度对催化剂的催化作用影响较小。MnO_2作为催化剂,既能够加快双氧水分解速度,还可以降低超轻泡沫混凝土的表观密度。
When hydrogen peroxide is used as a blowing agent to prepare ultra-light foam concrete, the hydrogen peroxide has a slower foaming speed and a lower foaming efficiency, which not only results in the increase of the amount of hydrogen peroxide but also increases the dry density of the ultra-light foam concrete. The effects of MnO 2, Fe 2 O 3, CuCl 2 and Ca (ClO) 2 on the hydrogen peroxide and the effects of pH value and temperature on the decomposition rate and efficiency of hydrogen peroxide were studied in order to improve the speed and efficiency of hydrogen peroxide decomposition. The results showed that MnO 2 promoted the decomposition of hydrogen peroxide significantly, and the decomposition rate of hydrogen peroxide was significantly increased up to 93% under the action of MnO 2. When the content of MnO 2 exceeded 0.03 g / ml, the increase of MnO 2 did not affect the decomposition rate of hydrogen peroxide While the effect of temperature on the catalysis of the catalyst was little. MnO 2 as a catalyst, can accelerate the rate of hydrogen peroxide decomposition, but also can reduce the apparent density of ultra-light foam concrete.