Concrete friction coefficient determination method and device

Abstract

The invention discloses a concrete friction coefficient determination method and device. The method comprises the following steps: step 1, pouring concrete into a concrete pump pipe, and tamping the concrete in an insertion manner through an insertion tamping rod, so as to enable the concrete to be more uniform and compact; step 2, at any moment when the concrete falls, measuring pressure intensity through a pressure sensor; step 3, measuring a falling speed of the concrete through a speed measurement instrument; step 4, measuring falling time of the concrete through a probe type timing switch; step 5, obtaining the friction coefficient mu of the concrete through a calculation formula shown in the description. The device comprises the concrete pump pipe, a support, the pressure sensor, a bracket, the speed measurement instrument, the probe type timing switch, a hopper door and the insertion tamping rod. By adopting the concrete friction coefficient determination method and device, the friction coefficient between pumping concrete and the concrete pump pipe of different ratios can be detected and then the pumping performance of the concrete can be evaluated.

Description

technical field [0001] The invention relates to a measuring device and method for friction coefficient, in particular to a measuring method and device for concrete friction coefficient. Background technique [0002] In the prior art, methods such as slump test and pressure bleeding test are generally used to evaluate the pumping performance of concrete over 100 meters high. Such methods reflect the pumping performance of the concrete body such as fluidity and water retention. It cannot reflect the time-lapse loss of slump and expansion of concrete during the pumping process, and it is not suitable for high-strength concrete such as 50Mpa or more commonly used in pumping construction; while the collapse test, flow Methods such as rheological tests reflect the plastic viscosity and yield stress of the concrete body, without taking into account the rheological characteristics of the lubricating layer between the concrete and the pump pipe, and cannot most intuitively reflect th...

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Problems solved by technology

[0002] In the prior art, methods such as slump test and pressure bleeding test are generally used to evaluate the pumping performance of concrete over 100 meters high. Such methods reflect the pumping performance of the concrete body such as fluidity and water retention. It cannot reflect the time-lapse loss of slump and expansion of concrete during the pumping process, and it is not suitable for high-strength concrete such as 50Mpa or more commonly used in pumping construction; while the collapse test, flow Methods such as rheological tests reflect the plastic viscosity and yield stress of the concrete body, without taking into account the rheological characteristics of the lubricating layer between the concrete and the pump pipe, and cannot most intuitively reflect the relationship between the concrete and the pump pipe during the pumping process. The interaction between them is mainly manifested as friction

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