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Fixing time detecting method for roller compacted concrete construction site

A roller compacted concrete, construction site technology, applied in the direction of measuring devices, material inspection products, instruments, etc., can solve problems such as inconvenient, indirect coverage time, and non-targeted

Active Publication Date: 2007-08-08
POWERCHINA ZHONGNAN ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the indoor coagulation time test conditions cannot fully simulate the site conditions, and the site construction is affected by various factors, the control of the coverage time is still indirect, untargeted, and inconvenient

Method used

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  • Fixing time detecting method for roller compacted concrete construction site
  • Fixing time detecting method for roller compacted concrete construction site

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: The method for detecting the setting time of the roller compacted concrete construction site, taking the dam roller compacted concrete construction as an example, implements according to the following steps:

[0024] (1) On the concrete surface 2 that has been paved and rolled, the probe 1 is embedded downward. The probe 1 is a cone with a cylindrical shape, the cylindrical surface is engraved with an embedded depth line, and the bottom is easy to be embedded. Common probe made of metal material with hexagonal nut on the shape and top, the outer diameter of probe 1 is 30mm;

[0025] (2), record the time of adding water to the mixed concrete as the detection start time;

[0026] (3), according to the set time interval, use the rotational moment detector 3 to measure the rotational moment value of the probe in the conventional way, the interval time is 15min, if the retarder is applied in the concrete, the interval time is 30min;

[0027] (4), probe detecti...

Embodiment 2

[0031] Embodiment 2: the method for detecting the setting time of the roller compacted concrete construction site, still take the dam roller compacted concrete construction as an example, and implement according to the following steps:

[0032] (1) On the concrete surface 2 that has been paved and rolled, the probe 1 is embedded downward. The probe (1) is cylindrical, with an embedded depth line engraved on the cylindrical surface, and the bottom is convenient for insertion A bleeding-type probe with a conical shape and a hexagonal nut on the top made of non-metallic material, the body is provided with a bleeding groove, and a bleeding-water collection hole is arranged on the depth line, and the outer diameter of the probe (1) is 50mm;

[0033] Steps (2) to (4) are the same as steps (2) to (4) of Example 1;

[0034] (5), probe detection. The probe detects more than 3 times per unit detection time, and then determines the value of the obtained rotation torque value according t...

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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...

Claims

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Application Information

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IPC IPC(8): G01N33/38G01N3/00
Inventor 邬钢熊国民肖峰冯树荣戴波罗俊军
Owner POWERCHINA ZHONGNAN ENG
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