HF粉煤灰混凝土的力学变形及抗冲磨性能试验研究

Experimental Research on HF Fly Ash Concrete Mechanical Deformation and Abrasion Resistance

为了研究了不同粉煤灰掺量、水胶比、HF抗冲磨剂掺量对混凝土的力学及变形性能和耐久性的影响规律,进行了HF粉煤灰混凝土的抗压强度、极限拉伸、抗压弹性模量等力学及变形性能试验以及HF粉煤灰混凝土的抗冻、抗渗、抗冲磨等耐久性试验。结果表明:在相同HF抗冲磨剂掺量和水胶比情况下,混凝土抗压强度并不是随粉煤灰掺量的增加而增加,而是都表现出先增加后降低的规律性现象;在相同粉煤灰掺量和水胶比情况下,随HF抗冲磨剂的掺量的增加其抗冲磨强度得到较大提高,混凝土抗压强度也有所提高,但是在提高HF掺量来增加混凝土强度的同时并考虑与之相匹配的水胶比时,这样能使HF抗冲磨剂对混凝土强度的效用更好地发挥出来;从粉煤灰掺量对不同龄期混凝土多个力学及变形性能和耐久性性能的影响规律来看,HF粉煤灰混凝土的设计龄期为90d时,粉煤灰掺量宜为25%以内,不宜超过30%;随水胶比在一定范围内的降低,混凝土抗压强度、极限拉伸值、抗拉弹性模量、轴心抗拉强度、抗压弹性模量、轴心抗压强度、抗冲磨强度均规律性提高。

In order to study the effects of different amounts of fly ashes, water cement ratio, content of anti-abrasion agent HF to concrete mechanics, deformation performance and durability, HF fly ash concrete＇s mechanics performance experimental-compressive strength, tensile, compressive modulus of elasticity and HF fly ash concrete＇s antifreeze, impermeability and anti-abrasion durability experimental are carried out. The results show that in the same HF anti-abrasion agent content and water-hinder ratio, compressive strength of concrete is not increased with the increasing dosage of fly ash, but showed the phenomenon of first rose and then dropped; in the same amount of fly ash and water-binder ratio, with the mixed quantity of increase in HF anti-abrasion agent, its ab- rasion resistance is greatly improved, the compressive strength of concrete is also improved, but the matching water-binder ratio is considered in improving the mixed quantity of HF anti-abrasion agent to increase HF concrete strength, which can result in the utility of HF anti-abrasion agent to play out better to the effect of concrete strength; according to different periods of fly ash contents on the mechanical properties and durability of concrete performance influence law, when HF fly ash concrete＇s design age is 90d, fly ash content should be 25% less than 30. As water hinder ratio decreases in a certain range, concrete compressive strength, the ulti- mate tensile strain, tensile elastic modulus of axis, tensile strength, compressive elastic modulus of axis, compressive strength, anti -abrasion strengths are improved regularly.