内陆干旱区年蒸发量大,通过研制一种干硬后可漂浮于水面的轻质混凝土,后期将其制成板状结构覆盖于水库水体之上,将大大减少平原水库的无效蒸发,以期达到节水目的。EPS(聚苯乙烯泡沫塑料Expanded polystyrene sphere)是一种稳定的、不吸水的、憎水性的、封闭式的超轻颗粒,用以取代混凝土的粗集料和细集料,通过加入适量的粉煤灰、高效引气减水剂和对施工工艺的改良,可改善EPS颗粒与水泥浆体的黏结性,按照试验前事先制定好的要求,可制得表观密度<500 kg/m3、抗折强度>1.5 MPa的EPS轻质混凝土。该混凝土制成板可应用于内陆干旱区平原水库的防蒸发节水技术上。
A light-weighted concrete is developed to reduce the invalid evaporation and save water in inland arid plain areas. It could float on water surface after drying and so is made into plate-like structure overlying on the water surface in reservoir. EPS (expanded polystyrene sphere) is a super-light closed particle which is stable, non-water-absorbent, and hydrophobic. It is used to replace the coarse and fine aggregates in concrete, and by adding an appropriate amount of fly ash, efficient air-entraining water-reducing agent and improving the production technique, the cohesiveness between EPS particles and cement mortar is improved. According to requirements set before the test, the light-weighted concrete with apparent density less than 500 kg/m3 and flexural strength larger than 1.5 MPa is produced. Plates made of this light-weighted concrete could be applied to preventing the evaporation in reservoirs in inland arid plain areas.
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