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Adjusting method for water consumption by mortar used in rheological test

A rheological test and adjustment method technology, applied in flow characteristics, measuring devices, instruments, etc., can solve problems such as failure, inability to conduct tests, inaccurate adjustment of water consumption, etc.

Inactive Publication Date: 2014-06-11
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of inaccurate adjustment of the water consumption of the mortar used in the existing rheological test, which leads to the problem that the test cannot be carried out or fails, and provides a method for adjusting the water consumption of the mortar used in the rheological test

Method used

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  • Adjusting method for water consumption by mortar used in rheological test
  • Adjusting method for water consumption by mortar used in rheological test
  • Adjusting method for water consumption by mortar used in rheological test

Examples

Experimental program
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specific Embodiment approach 1

[0027] Embodiment 1: A method for adjusting water consumption of mortar for rheological tests in this embodiment is carried out according to the following steps:

[0028] 1. Arrange the standard set of sieves in descending order from the sieve hole width from large to small. Among them, the hole width of the sampling sieve with the smallest sieve hole width is 0.15mm, forming a set of sieves, and drying the normal graded sand to absolute In the dry state, the dried sand was sieved into different particle sizes with a cover to obtain 7 groups of sand;

[0029] 2. Calculate the average particle size d of sand in group i after sieving mi :

[0030] d mi =(d pi +d ri ) / 2;

[0031] In the formula, d pi is the hole width of the sieve holes in the upper sand layer of the i-th layer, d ri is the pore width of the sieve hole in the i-th subsand layer;

[0032] The surface area of ​​each grain of sand is: s = π d mi ...

specific Embodiment approach 2

[0049] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the absolute dry state described in step 1 means that the sample sand is dried to a constant weight in a drying oven at 100°C~110°C, and then The state after cooling to room temperature in a desiccator. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0050] Specific embodiment 3: The difference between this embodiment and specific embodiment 1 or 2 is that the normal graded sand described in step 1 is the natural sand graded in zone II specified in "Building Sand GBT14684-2011" . Others are the same as in the first or second embodiment.

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Abstract

The invention provides an adjusting method for water consumption by mortar used in a rheological test, which relates to an adjusting method for water consumption by mortar. The invention aims to overcome the problem that inaccurate adjustment of the usage amount of water for mortar used in a rheological test causes impracticability or failure of the test in the prior art. The method provided by the invention comprises the following steps: assuming the average particle size of graded sands to be an arithmetic mean value of the mesh width of an upper sieve and the mesh width of a lower sieve according to a calculation method for a specific surface area; assuming particle sizes of all the sands to be ideal spheres, successively calculating the diameters of sand particles, the surface area, the volume and the mass of each sand particle, the number of sand particles in layer i, calculating the total surface area of the sand particles in layer i and the total surface area of the sands, then calculating the water absorption rate of a fine sand sample with a particle size of 0 to 0.15 mm according to the water absorption rate of normal-grade mixed sands measured by Building Sand GBT14684-2011 and carrying out adjustment based on the water absorption rate of the fine sand sample. The method provided by the invention adjusts water consumption by the mortar, thereby guaranteeing smooth implementation of the rheological test of the mortar. The method is applied to the field of rheological tests.

Description

technical field [0001] The invention relates to a method for adjusting the water consumption of mortar. Background technique [0002] With the development and progress of science and technology, various advanced testing instruments and equipment emerge in endlessly. However, when using these instruments and equipment for test research, some of the previous test conditions and methods cannot match the instruments, and sometimes even lead to the inability to carry out the test research. For example, when using a rheometer to test the rheological properties of concrete mortar, considering the relationship between the reasonable clearance of the instrument fixture and the maximum particle size of the material, fine sand with a particle size of less than 0.15mm must be used in the mortar mixture. As the particle size of the sand is smaller, its specific surface area is larger, and the water absorption is also greatly increased. In the test, the water added according to the mixi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N11/00
Inventor 毛继泽喻虎刘宗民霍雷孙超温家宝
Owner HARBIN ENG UNIV