Experimental Study on Development of Unified Consistency Test system for Fresh Concrete

本文的目的是开发一种新的新混凝土稠度测试方法，简称新稠度测试方法，以期为性能化施工设计提供有用的信息。在新的稠度试验方法中，将新拌混凝土放置在振动台上，利用致动器模拟新拌混凝土在实际施工现场的浇筑形式。由于有作动器，这个表可以在垂直方向上以不同的频率和幅度振荡。新的一致性测试方法采用的指标是流量和加速度。流速与施工时间性能指标有关，加速度与施工方法性能指标有关。共试验了91种新混凝土，29种不同坍落度配合比为0.0 ~ 25.0 cm， 7种不同坍落度配合比为400 ~ 695 cm。得到了流量与加速度之间共有91种关系。通过试验研究发现，利用新稠度试验方法所取的流速与加速度的关系，可以统一评价从坍落度为0 cm到坍落度流量为655 cm稠度范围较大的新拌混凝土的施工性能。

The aim of this paper is to develop the new testing method for measuring the consistency of fresh concrete, which is named the new consistency test method shortly, in order to obtain the useful information on the performance-base construction design. In the new consistency test method, the fresh concrete is placed on the table vibrator using actuator to simulate the fresh concrete placing in the form on the actual construction site. Owing to an actuator, this table can be oscillated in vertical direction by varied frequency and amplitude. The indices taking by the new consistency test method are the flow rate and the acceleration. The flow rate is related to the index of the performance on construction time and the acceleration is related to the index of the performance on construction method. A total of 91 fresh concretes having 29 types mix proportions with various slump from 0.0 cm to 25.0 cm and 7 types mix proportions with various slump flow from 400 cm to 695 cm were tested. And I t was obtained that a total of 91 relationships between the flow rate and the acceleration.As a result of this experimental study, It was found out that the performance on construction of fresh concrete having the large range of the consistency from the slump of 0 cm to the slump flow of 655 cm could be estimated uniformly using the relationship the flow rate and the acceleration taking by the new consistency test method.