论文：粉煤灰混凝土 激发剂 抗压强度

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。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 compositions of HFCC. The natures of the fly ash influence the performance of the concrete directly. Several main physical and chemical properties are introduced:the density, detailed degree, chemical element composition, activity of the fly ash, the interaction between the fly ash and concrete etc.2.The compressive strength of concrete cubeThrough the experiments of the compressive strength of concrete cube on 351 fly ash concrete with the dimensions of 100mm×100mm×100mm, concrete grade on compressive strength, the number of the fly ash, the varieties of the active agent and conserve age were investigated. The experiment results showed, the early strength can be improved after adding to active agent; With the conserve age growth, The strength development of the fly ash concrete is quicker than benchmark.3.Flexural compressive strength of the cement grinding Through the experiments of the Flexural compressive strength of the cement grinding on 113 fly ash cement grinding with the dimensions of 160mm X 40mm X 40mm, the number of the fly ash, the varieties of the active agent and conserve age were

investigated. The experiment results showed, the early strength can be improved after adding to active agent; With the conserve age growth, The strength development of the specimens adding into the fly ash is quicker than benchmark.4.The air content of the fly ash concreteThrough the experiments of the air content of the fly ash concrete and the density of the mix on 18, the experiment results showed, the mixture of the fly ash have little influence with the air content of the concrete.5.The cement hydration heatThrough the experiment which is on the fly ash content was 0%,40%,50%, 60% of the cement hydration heat determination of seven days. The experiment results showed, with the fly ash content increasing, the cement hydration heat is little.

【关键词】大掺量 粉煤灰混凝土 激发剂 抗压强度 大体积混凝土

【英文关键词】High concent Fly ash content concrete Active agent Compressive strength Mass concrete structure

【目录】大掺量粉煤灰混凝土抗压性能试验研究4-610-1111-12

Abstract6-7

1 绪论10-13

摘要1.1 概况

1.2 大掺量粉煤灰混凝土的应用与发展概况1.3 本文主要研究内容

12-13

2 粉煤灰性质与

粉煤灰混凝土配合比煤灰的分类13-1413-14性质14-1514-1515-16

13-202.1 粉煤灰来源132.2 粉

2.2.1 根据物理性质划分

2.3 粉煤灰的物理

2.2.2 根据化学性质划分14

2.3.1 密度142.3.3 需水量比152.5 粉煤灰效应16-17

2.3.2 细度

2.4 粉煤灰的化学性质2.6 粉煤灰混凝土配合

3.1 研究因素

比设计原则17-202020

3 试验概况20-27

3.2 试验用原材料20-213.2.2 石子

20

3.2.1 水泥

3.2.4 高

3.2.3 砂子20-21

3.2.6 激发剂

效减水剂2121

3.2.5 粉煤灰21

3.3 混凝土配合比设计21-243.4 试件的制作与养

3.6 水泥胶

4.1

护24-253.5 混凝土含气量的测定方法25

砂配合比设计25-274 试验数据处理及分析27-52

4.1.1 试验方法

大掺量粉煤灰混凝土抗压性能研究27-3927-28析31-38

4.1.2 抗压试验数据28-31

4.1.3 试验结果分

4.2

4.1.4 激发剂提高强度机理分析38-39

4.2.1 试验方法

水泥胶砂抗折、抗压强度研究39-4639-4042-46-4947-4949-52

4.2.2 试验结果40-42

4.2.3 试验结果分析

4.3 粉煤灰混凝土含气量的测定与研究4.3.1 试验方法47

4.3.2 试验数据及分析

4.4 掺粉煤灰水泥水化热的测定与研究4.4.1 试验方法49

4.4.2 试验数据及分析

49-52展望53-

5 结论与展望52-

参考文献-56

.

5.1 结论52-53致谢56 ：139938848

.

.

.

.

.

.

.

5.2

【说明】索购全文在线加好友

同时提供论文写作一对一指导和论文发表委托服务。

本文为学术文献总库合作提供，无涉版权。作者如有异议请与总库或学校联系。