粉煤灰是一种慢凝的活性掺合料,在混凝土中掺用这种材料后,可对混凝土的许多性能产生有利影响:1.研究表明,对粉煤灰含量高的碾压混凝土的热学物理性能与普通大体积混凝土相同,它所释放的热量却比同量胶结料的普通混凝土少50%以上。因此这种掺合料可降低混凝土的早期温升,以防止混凝土产生开裂。2.由于掺用粉煤灰后可减少混凝土的用水量,从而可降低它的透水性。3.对掺有粉煤灰的混凝土,在凝结过程中粉煤灰可大大地增强颗粒间的粘结力,从而可相应地增加混凝土的密实度和强 Fly ash is a slow-condensing active admixture. Adulteration of this material in concrete can have a beneficial effect on many properties of concrete: 1. Studies have shown that for fly ash high RCC The thermal physical properties are the same as ordinary mass concrete, which releases more than 50% less heat than ordinary concrete with the same amount of cementing material. Therefore, this admixture can reduce the early temperature of concrete to prevent cracking of concrete. 2. As the use of fly ash can reduce the water consumption of concrete, which can reduce its water permeability. 3. For concrete mixed with fly ash, fly ash in the coagulation process can greatly enhance the adhesion between the particles, which can be a corresponding increase in the density and strength of concrete