Fixing time detecting method for roller compacted concrete construction site

Abstract

The RCC construction site time detection method has the following steps: (a) pre-embedding the probe (1) on the paved RCC surface (2); (2) recording the mixing RCC water time as the testing initial time; (3) interval using the rotation moment detector (3) to measure the probe rotary torque value; (4) probe detection; (5) using the obtained testing data to draw 'Torque(N*m)~time(h) curve', the curve having two inflection points, and taking the corresponding time of the first inflection point as the RCC initial time, and providing the effective process control basis to the RCC coverage time. It accurately assures the combination quality between the RCC layers, and fresh concrete without screening and the method is easy to grasp, and the site trial proves the testing results being accurate.

Description

technical field

[0001] The invention belongs to the technical field of concrete construction and relates to a method for detecting the time required for setting of concrete poured during on-site construction of roller compacted concrete (RCC). Background technique

[0002] RCC construction, especially dam RCC construction, the most critical issue is the bonding quality between RCC layers. Poor quality control of the bonding between layers of roller compacted concrete will lead to fatal problems of leakage and instability of the dam, resulting in catastrophic consequences; good quality control of the bonding between layers will make the progress of the dam construction of roller compacted concrete. The advantages of fast speed, low investment and high efficiency are fully utilized. The control of the bonding quality between layers is mainly realized by controlling the concrete covering time. The key control point of covering time is the control of concrete setting time. In...

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