Determination method for compression strength ratio of low-quality recycled fine aggregate mixed mortar

A technology of recycled fine aggregate and compressive strength, applied in the direction of applying stable tension/compression to test the strength of materials, etc., can solve problems such as research, discarding, and lack of performance of low-quality recycled aggregate, and achieve difference reduction Effect

Inactive Publication Date: 2015-01-07
北京东方建宇混凝土科学技术研究院有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, this low-quality recycled aggregate is basically abandoned in China, and t

Method used

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  • Determination method for compression strength ratio of low-quality recycled fine aggregate mixed mortar
  • Determination method for compression strength ratio of low-quality recycled fine aggregate mixed mortar
  • Determination method for compression strength ratio of low-quality recycled fine aggregate mixed mortar

Examples

Experimental program
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Effect test

Embodiment 1

[0041] The cement is P·O42.5 cement, the content of low-quality recycled fine aggregate is 23.9%, and the particle size is 80 μm to 5 mm. Some performance indicators cannot meet the technical requirements of category III indicators for concrete, and the low-quality recycled fine aggregate in the mixed sand Aggregate dosage is 20wt%. Using the method in this example to measure the strength ratio of the low-quality regenerated fine aggregate mixed mortar, the specific detection method is:

[0042] (1) According to the provisions of GB / T14684-2011 "Sand for Construction", the saturated surface dry water absorption of low-quality recycled fine aggregate is 12.4%, and the saturated surface dry water absorption of standard sand is 1.7%.

[0043] (2) Dry the low-quality recycled fine aggregate to be tested and the standard sand that meets the requirements of GB178 at 105°C to constant weight, and sieve out particles with a particle size greater than 5.00mm.

[0044](3) Take by weigh...

Embodiment 2

[0057] Cement is the benchmark cement, the content of low-quality recycled fine aggregate is 22.4%, and the particle size is 80 μm to 5 mm. Some performance indicators cannot meet the technical requirements of category III indicators for concrete, and the content of low-quality recycled fine aggregate in the mixed sand is 40wt%. Use the method in this example to measure the strength ratio of the low-quality recycled fine aggregate mixed mortar. The water used in this method is clean water that meets the requirements of JGJ63. The specific detection method is:

[0058] (1) According to the provisions of GB / T14684-2011 "Construction Sand", the saturated surface dry water absorption of low-quality recycled fine aggregate is 11.9%, and the saturated surface dry water absorption of medium sand with a fineness modulus of 2.5 is 1.5 %;

[0059] (2) Dry the low-quality recycled fine aggregate to be tested and medium sand with a fineness modulus of 2.5 at 105°C to constant weight, and...

Embodiment 3

[0073] The cement is P·O42.5 cement cement, the content of low-quality recycled fine aggregate is 24.7%, the particle size is 80μm~5mm, the firmness is less than 10%, the dry water absorption of the saturated surface is less than 5%, and some performance indicators cannot reach According to the technical requirements of category III indicators for concrete, the content of low-quality recycled fine aggregate in the mixed sand is 30wt%. Using the method in this example to measure the strength ratio of the low-quality recycled fine aggregate mixed mortar, the specific detection method is:

[0074] (1) According to the provisions of GB / T14684-2011 "Sand for Construction", the saturated surface dry water absorption of low-quality recycled fine aggregate is 13.2%, and the saturated surface dry water absorption of medium sand with a fineness modulus of 2.8 is 1.6 %;

[0075] (2) Dry the low-quality recycled fine aggregate to be tested and medium sand with a fineness modulus of 2.8 a...

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Abstract

The invention discloses a determination method for compression strength ratio of low-quality recycled fine aggregate mixed mortar. The determination method comprises the steps of firstly determining saturated-surface-dry water adsorption of the low-quality recycled fine aggregate and common sand; drying to a constant weight; weighing dried common sand and cement; mixing the dried common sand with the cement; adding water with stirring to obtain mortar until the fluidity of the mortar is (130+/-5) mm; making a benchmark mortar test specimen from the mortar; testing after 28 days of standard curing; recording a strength being f[0] MPa; then mixing the low-quality recycled fine aggregate and the common sand to obtain mixed mortar; weighing the mixed mortar and the cement; mixing the mixed mortar with the cement; adding water in the mixture to prepare a contrast mortar specimen; testing after 28 days of standard curing; and recording a strength being f MPa. The mortar compression strength ratio (delta) after 28 days of standard curing is equal to f/f[0]. The determination method takes additional water consumption while determining the mixed mortar strength ratio, and can actually reflect the performances of the mixed recycled fine aggregate.

Description

technical field [0001] The invention relates to a detection method of recycled mixed aggregate, in particular to a method for measuring the compressive strength ratio of low-quality recycled fine aggregate mixed with mortar, and belongs to the fields of construction waste resource utilization and building material waste utilization. Background technique [0002] Recycled aggregates refer to aggregates that are processed from concrete, mortar, stone, bricks and tiles in building (structure) waste and are reused in concrete, mortar, etc. The sources of recycled aggregates are diverse, and the local differences are large, so the performance is unstable and discrete. Compared with ordinary sand and gravel aggregates, the surface of recycled aggregates is rough, with more edges and corners, and the surface of aggregates is also covered with A considerable amount of cement mortar (high porosity, high water absorption). In addition, in the process of disintegration and crushing, t...

Claims

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Application Information

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IPC IPC(8): G01N3/10
Inventor 王安岭武俊宇段遵莉赵玉芳韦宏健耿斌
Owner 北京东方建宇混凝土科学技术研究院有限公司
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