论文：粉煤灰混凝土 激发剂 抗压强度.docVIP

论文：粉煤灰混凝土 激发剂 抗压强度 【中文摘要】粉煤灰是燃煤发电厂产生的工业废料,在我国排放量非常大,将其应用于混凝土中能够减少水泥用量,降低混凝土成本,节约资源,实现粉煤灰的资源化利用。在大体积混凝土结构中采用大掺量粉煤灰混凝土能够有效降低水泥水化热引起的混凝土内部温升,从而有效避免大体积混凝土的早期开裂。但随着粉煤灰掺量的增加,由于粉煤灰火山灰活性没有得到很好的激发,使混凝土的早期强度明显降低,使大掺量粉煤灰混凝土的推广应用受到一定的限制。本文通过对大掺量粉煤灰混凝土力学性能的试验研究,探讨粉煤灰掺量、激发剂种类、养护龄期等对大掺量粉煤灰混凝土的影响规律。本文主要研究：1.粉煤灰性质粉煤灰是大掺量粉煤灰混凝土的主要组分,粉煤灰的性能将直接影响混凝土的性能。本文主要阐述了粉煤灰的几个物理化学性能：密度、细度、需水量比、化学组成、粉煤灰活性、粉煤灰与混凝土的相互作用关系等。2.粉煤灰混凝土抗压强度通过339组100mm×100mm×100mm粉煤灰混凝土试块的立方体抗压强度试验,研究了粉煤灰掺量、激发剂种类和养护龄期等因素对不同强度等级粉煤灰混凝土抗压强度的影响规律。结果表明,激发剂可以提高粉煤灰混凝土的早期强度；随着龄期的增长,粉煤灰混凝土立方体抗压强度比基准混凝土立方体抗压强度发展的快。3.水泥胶砂抗折、抗压强度通过109组160mm×40mm×40mm粉煤灰水泥胶砂试块的抗折、抗压强度试验,研究了粉煤灰掺量、激发剂种类和养护龄期等因素对粉煤灰水泥胶砂强度的影响规律。结果表明,激发剂能够提高水泥胶砂的早期抗压强度；随着龄期的增长,粉煤灰水泥胶砂试块的强度比基准水泥胶砂试块的强度发展迅速。4.粉煤灰混凝土含气量通过对18组不同掺量粉煤灰混凝土含气量和混凝土拌合物密度的测定,研究了粉煤灰对混凝土含气量和密度的影响。结果表明,粉煤灰掺量对含气量影响很小。5.水泥水化热研究了粉煤灰掺量对水泥水化热的影响,测试了粉煤灰掺量为0%、40%、50%、60%时水泥7天水化热,结果表明,随着粉煤灰掺量的增加,水泥水化放出的热量逐渐减小。 【英文摘要】Fly ash is coal-fired power plant produces industrial byproduct, the emission of fly ash is very enormous in our country. High fly ash content concrete (HFCC) can consume lots of fly ash, reduce cement consumption and the production cost of concrete. It also can economize the resources and in the meantime turn waste into wealth. In the mass concrete structure HFCC can effectively reduce the temperature by the cement hydration heat caused, thus HFCC can avoid the early crack of the mass concrete structure. But in the same time with increasing the number of the fly ash, the volcanic ash activity of the fly ash do not get good arousal, the make the early strength of concrete reduced considerably. It is this reason for technological personnel to fly ash concrete have certain of prejudice, limiting high fly ash concrete application.This text represents the study on the main performance of HFCC, combining practice data, and makes every to find and improve the early strength of HFCC, raising their use potentiality actually. The main achievements are as follows:1.Property of the fly ashFly ash is the main c