混凝土泵送性能的流变学表征及预测综述

doi:10.11896/j.issn.1005-023X.2018.17.011

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Abstract  Since the first application of pumping concrete in the US in 1933, pumping has become the most important construction technology of concrete. With the continuously increasing height of building, concrete pumping has become more difficult. Although pumping technique has been used to build many high-rising buildings in China, successful pumping was based on the time-consuming and expensive large scale pumping test, and the empirical equations in the code or standard do not fit the measured data on job site. This indicates that theoretical research far lags behind the application of pumping concrete. Since fine management of engineering and high requirement of quality control of concrete has been required in most cases, extensive empirical method and expensive large scale test cannot adapt to the new development trend of the industry. Thus, it is necessary to provide theoretical foundation for concrete pumping technology.
   Rheological theory is an effective tool to study the pumping of concrete. Foreign researchers have carried out comprehensive researches on the flowing behavior of concrete in pumping pipe, characterization of lubrication layer, and prediction of pumping, and some good results has been obtained. However, there are very limited researches conducted in China. Results show that concretes with different yield stresses flow in pumping pipe in different patterns. The model based on the rheological parameters of concrete and lubrication layer can precisely predict concrete pumping pressure.
   It is generally believed that the lubrication layer is the most important factor affecting pumping, and many methods have been developed to characterize lubrication layer, including sliding pipe rheometer, tribometer, and equivalent mortar. Different tribometers and testing programs have also been developed. Based on the rheological parameters of concrete and lubrication layer, analytical numerical model for describing the flow of concrete in pipe has been developed, and the relationship among pumping pressure, rheological properties of concrete and pumping rate has been established. This provides theoretical bases for predicting the behavior of concrete pumping. However, different rheological characterization methods of lubrication layer give different results, and which method can reflect the real situation of concrete pumping is still an open question. In addition, concrete flows in bending pipe, vertical pipe and soft pipe are seldom studied. In order to predict concrete pumping in practice, it is necessary to develop appropriate rheological tools based on the characteristics of concrete in China and real engineering.
   The most up-to-date researches on the flowing behavior of concrete in pumping pipe, characterization of lubrication layer, and prediction of pumping are reviewed in this paper, and the advantages and disadvantages of different methods and theories are analyzed.

Key words： concrete pumping rheology

Published: 19 September 2018

CLC number:

TU528.53

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	Articles by authors
	YUAN Qiang
	LI Baiyun
	SHI Caijun
	AN Xiaopeng
	HUANG Hai

Cite this article:

YUAN Qiang,LI Baiyun,SHI Caijun, et al. An Overview on the Prediction and Rheological Characterization of Pumping Concrete[J]. Materials Reports, 2018, 32(17): 2976-2985.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.17.011 OR http://www.mater-rep.com/EN/Y2018/V32/I17/2976

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