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A kind of waste paper fiber used for self-curing of cement-based materials and its preparation method

A cement-based material and waste paper fiber technology, applied in the field of building materials, can solve problems such as increased production costs, waste water and soil pollution, waste of wood resources, etc., and achieve the effects of improving water absorption capacity, reducing production costs, and reducing environmental pollution

Inactive Publication Date: 2017-01-18
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the cellulose fibers currently studied are derived from raw wood fibers. During the preparation of cellulose fibers, hemicellulose and lignin must be removed through papermaking processes, which increases production costs and wastes woody resources. At the same time, the cellulose extraction process requires a large amount of acid. Alkali is involved, and the discharge of wastewater has also caused serious water and soil pollution.

Method used

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  • A kind of waste paper fiber used for self-curing of cement-based materials and its preparation method
  • A kind of waste paper fiber used for self-curing of cement-based materials and its preparation method
  • A kind of waste paper fiber used for self-curing of cement-based materials and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A waste paper fiber for self-curing of cement-based materials, which is prepared by using the following components and raw materials in parts by weight: waste paper secondary fiber 60, dispersant 5, alkyl surfactant 0.1, alkali-resistant coating 3, Among them, the secondary fiber of waste paper is obtained from scraps discarded by paper mills, waste book paper, wrapping paper, and urban household waste paper. The cellulose content is greater than 70%, and the water absorption rate is greater than 8 times its own gravity. The dispersant is kaolin or bentonite with a fineness greater than 5000 mesh. The surfactant is cetyl ammonium bromide or cetyl ammonium chloride. Anti-alkali coating is nano TiO 2 Hydrosol.

[0033] The preparation method of the waste paper fiber used for self-maintenance of cement-based materials adopts the following steps:

[0034] (1) Soak the waste paper completely in water for a period of time, pour it into a hydraulic pulper, control the pulp...

Embodiment 2

[0048] A waste paper fiber for self-curing of cement-based materials, which is prepared by using the following components and raw materials in parts by weight: waste paper secondary fiber 70; dispersant 8; alkyl surfactant 0.3; alkali-resistant coating 5, Secondary fibers of waste paper are obtained by thawing scraps discarded by paper mills, waste book paper, wrapping paper, and municipal waste paper. The content is greater than 70%, and the water absorption rate is greater than 8 times of its own gravity. The dispersant is kaolin or bentonite with a fineness greater than 5000 mesh. The surfactant is cetyl ammonium bromide or cetyl ammonium chloride. Anti-alkali coating is nano TiO 2 Hydrosol.

[0049] The preparation method of waste paper fibers used for self-maintenance of cement-based materials is the same as in Example 1, and the specific process parameters are as follows:

[0050] Table 3 Process parameters of waste paper treatment

[0051]

[0052]

[0053] T...

Embodiment 3

[0058] A waste paper fiber used for self-curing cement-based materials, which is prepared by using the following components and raw materials in parts by weight: waste paper secondary fiber 90; dispersant 20; alkyl surfactant 0.6; alkali-resistant coating 10. Secondary fibers of waste paper are obtained by thawing scraps discarded by paper mills, waste book paper, wrapping paper, and municipal waste paper. The content is greater than 70%, and the water absorption rate is greater than 8 times of its own gravity. The dispersant is kaolin or bentonite with a fineness greater than 5000 mesh. The surfactant is cetyl ammonium bromide or cetyl ammonium chloride. Anti-alkali coating is nano TiO 2 Hydrosol.

[0059] The preparation method of waste paper fibers used for self-maintenance of cement-based materials is the same as in Example 1, and the specific process parameters are as follows:

[0060] Table 5 Process parameters of waste paper treatment

[0061]

[0062] Table 6 P...

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Abstract

The invention relates to a waste paper fiber for self-curing of a cement-based material, and a preparation method of the waste paper fiber. The waste paper fiber is prepared from the following raw materials in parts by weight: 60-90 parts of waste paper secondary fiber, 5-30 parts of dispersant, 0.1-1 part of alkyl surfactant and 3-15 parts of alkali-resistant coating. Compared with the prior art, the prepared waste paper fiber for the self-curing can compensate the defect of moisture generated by negative pressure of a capillary pore in an early shrinkage process of the cement-based material, raises the hydration degree of cement, and reduces shrinkage cracking of the cement-based material at a hardening stage.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a waste paper fiber used for self-maintenance of cement-based materials and a preparation method thereof. Background technique [0002] Cement-based materials have always been the largest building material and are widely used in the construction industry. However, because of the heterogeneous phase, especially the high-strength concrete with low water-binder ratio studied in recent years, the micro-cracks caused by shrinkage directly affect the performance of cement-based materials. mechanical properties and durability. Affected by the environment and the cement hydration process, when the external environmental humidity is lower than the internal humidity or the internal pore water cannot normally meet the cement hydration water consumption, and the external water cannot be replenished in time, the cement-based material will shrink and spontaneously dry. Shrinkage,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B18/24
CPCY02W30/91
Inventor 蒋正武郭秀艳
Owner TONGJI UNIV
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