标题: | 自充填混凝土、流动化混凝土与一般混凝土之质流行为 The Rheological Behavior of Self-Compacting, Flowing and Normal Concrete |
作者: | 李修齐 Hsiu-Chi Lee 赵文成 Wen-Chen Jau 土木工程学系 |
关键字: | 自充填混凝土;self-compacting concrete |
公开日期: | 2002 |
摘要: | 目前SCC的检定方法为新拌之混凝土必须通过坍流度试验、V漏斗流出试验、箱型充填试验,并于浇置前通过全量通过试验才能称为SCC。但采用上述的试验法来评估其工作性,不但相当麻烦而且其可信度及敏感度方面均不甚理想。究其原因可知,这些测试法均属单点试验法(Single-point Test),其量测结果无法代表混凝土本身内部的特性。为避兔此缺陷,采用质流试验可达到此目的,因为透过质流理论,模拟混凝土之流变行为,解析其降伏应力ty(Yield stress)与塑性黏度m(Plastic viscosity),藉透过此两者之关系,可以推求出SCC的工作性优良与否。本文预期测试之项目包括: (1)自充填混凝土(SCC):在相同的水灰比和相同的骨材含量下,仅改变粉体量中水泥及卜作岚材料(飞灰、炉石)的比例,探讨其对质流行为的影响。并藉由SCC所求得的降伏剪应力(ty)和黏滞性(m)得到一个符合自充填混凝土的范围。 (2)水泥砂浆(Mortar):探讨水泥砂浆对于不同比例的水泥、飞灰和炉石对降伏剪应力和黏度有何影响。 (3)水泥浆(Paste):改变粉体中水泥、飞灰、炉石的比例,探讨不同比例下,其质流行为。并讨论自充填混凝土、水泥砂浆和水泥浆三者之间的关系。 (4)流动化混凝土(Flowing Concrete):以粉体量当变数,探讨不同粉体量对质流行为的影响。 (5)一般混凝土(OPC):以坍度和砂率当变数,探讨其质流行为。 The current workability test for SCC is Slump-Flowing-test, V-test and U-test. These methods are very troublesome and the result is only “Single-point Test”. The results can’t represent the characteristic of concrete. In order to avoid this disadvantages; rheological tests are utilized. Rheological test can give two parameters; yield stress (ty) and plastic viscosity (m). By using the relationship of yield stress and plastic viscosity we may better represent the concrete’s workability. The test expected program is to investigate the following: (1)Self-Compacting Concrete (SCC):The W/B and aggregates content are the same, but change the proportion of cement and pozzollans (fly ash、slag ) to determine the effect of the W/B & aggregate content on the rheological behavior. (2)Mortar:Examining the change of the proportion of cement and pozzollans (fly ash、slag ) on yielding stress and viscosity. (3)Paste:Studying the effect of the proportion of cement and pozzollans (fly ash、slag ) on the rheological behavior, and discusses the relationship among SCC、mortar and paste. (4)Flowing Concrete(FC):Determining effect of amount of the mineral admixtures on the rheological behavior. (5)Ordinary Property Concrete (OPC): The effect of S/A and the slump on the rheological behavior. |
URI: | http://140.113.39.130/cdrfb3/record/nctu/#NT910015074 http://hdl.handle.net/11536/69751 |
显示于类别: | Thesis |