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Low cementitious material self-compact concrete with rice husk ash as internal curing agent

A technology of self-compacting concrete and rice husk ash, applied in the field of environmental protection, energy saving, and new material technology, can solve problems such as increased production costs, achieve the effects of reducing processing costs, wide application range, and strong controllability

Inactive Publication Date: 2015-07-08
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to meet engineering needs, it is usually necessary to increase the amount of cementitious materials to meet the self-compacting performance requirements, thereby providing self-compacting concrete with a strength higher than the design, which in turn leads to increased production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The raw materials of self-compacting concrete with low gelling materials include Portland cement 45%, rice husk ash 30%, slag micropowder 20%, modified polycarboxylate superplasticizer 0.8%, and filling materials 4.2%. The set-ash ratio is 5, and the water-binder ratio is 0.38. The workability of the prepared self-compacting concrete and the performance of the standard curing at 20°C to the specified age are shown in Table 2.

[0025] Table 2 Performance test results of self-compacting concrete formula 1 with low gelling materials

[0026] project performance Slump, mm 290 Final setting time, h 7.2 3d compressive strength, MPa 12 28 d compressive strength, MPa 44.5 28 d drying shrinkage, % 2.8×10 -4 Carbonization depth, mm 14.2 Electric flux, C 1600

Embodiment 2

[0028] The raw materials of self-compacting concrete with low gelling materials include Portland cement 40%, rice husk ash 20%, slag micropowder 35%, modified polycarboxylate superplasticizer 1.2%, and filling materials 3.8%. The set-ash ratio is 5, and the water-binder ratio is 0.4. The workability of the prepared self-compacting concrete and the performance of the standard curing to the specified age at 20°C are shown in Table 3.

[0029] Table 3 Performance test results of self-compacting concrete formula 2 with low gelling materials

[0030] project performance Slump, mm 280 Final setting time, h 8 3d compressive strength, MPa 10.4 28 d compressive strength, MPa 36 28 d drying shrinkage, % 2.2×10 -4 Carbonization depth, mm 12 Electric flux, C 1380

Embodiment 3

[0032] The main raw materials of self-compacting concrete with low gelling materials are Portland cement 30%, rice husk ash 20%, slag micropowder 40%, modified polycarboxylate superplasticizer 1.5%, and filling materials 8.5%. The set-ash ratio is 5, and the water-binder ratio is 0.4. The workability of the prepared self-compacting concrete and the performance of the standard curing to the specified age at 20°C are shown in Table 4.

[0033] Table 4 Performance test results of self-compacting concrete formula 3 with low gelling materials

[0034] project performance Slump, mm 273 Final setting time, h 8.8 3d compressive strength, MPa 8.2 28 d compressive strength, MPa 26.7 28 d drying shrinkage, % 2×10 -4 Carbonization depth, mm 10.4 Electric flux, C 1400

[0035] It can further be seen from the above examples that the present invention involves a method for preparing self-compacting concrete with low gelling material ...

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Abstract

The invention relates to a low cementitious material self-compact concrete with rice husk ash as an internal curing agent. The low cementitious material self-compact concrete comprises Portland cement, rice husk ash, slag micro-powder, a modified polycarboxylate superplasticizer and a filler. The self-compact concrete has the characteristics of low consumption of Portland cement, good workability, stable later-stage strength development, low cost and substantial environment benefit. Compared with concretes in the prior art, the low cementitious material self-compact concrete has the advantages of self-compact concrete performance guaranteeing, reduction of the high burden and treatment cost of unused rice husk ash, slag micro-powder and other agricultural and industrial solid wastes to environment, and good application prospect.

Description

technical field [0001] The invention belongs to the field of new material technology, environmental protection and energy saving technology, and in particular relates to a low-gelling material self-compacting concrete using rice husk ash as an internal curing agent. Background technique [0002] Compared with ordinary concrete, self-compacting concrete has relatively high requirements on the quality of raw materials, such as the maximum particle size of coarse aggregate is not more than 20 mm, and the requirements for particle shape and gradation are good, which largely limits the size of self-compacting concrete. area promotion. Because concrete is usually produced using local materials, strict raw material quality control standards are often difficult to achieve, often technically feasible but economically impractical. Therefore, good economy puts forward higher requirements and challenges to the progress of self-compacting concrete preparation technology. Research on ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B22/00C04B40/04
Inventor 王培铭杨健英徐玲琳吴凯李楠
Owner TONGJI UNIV
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