Method for preparing cracking-resistant low-shrinking cement mortar with modified coconut fibers

A technology of coir fiber and cement mortar, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of large shrinkage deformation, easy cracking, etc. The effect of a small shrinkage value

Inactive Publication Date: 2016-10-26
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: according to the common defects of existing cement mortar such as easy cracking and large

Method used

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  • Method for preparing cracking-resistant low-shrinking cement mortar with modified coconut fibers
  • Method for preparing cracking-resistant low-shrinking cement mortar with modified coconut fibers
  • Method for preparing cracking-resistant low-shrinking cement mortar with modified coconut fibers

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Effect test

Embodiment 1

[0026] The present invention utilizes coconut shell fiber to prepare the method for anti-cracking low-shrinkage cement mortar, and this preparation method comprises the following steps:

[0027] a. Processing of coconut shell fiber:

[0028] First, clean the coconut shell fiber, then dry it (dry in an oven, the drying temperature is 60°C, and the drying time is 2 hours), and cut it into 8-12mm coconut shell fiber after drying;

[0029] b. Preparation of cement mortar:

[0030] 1m 3 Cement mortar is prepared from 720kg of raw cement, 1080kg of sand and 360kg of water; 1m 3 The addition amount of coconut shell fiber in the cement mortar is 0.6kg;

[0031] c. Preparation of anti-cracking low-shrinkage cement mortar:

[0032] 1. first take cement, sand and water according to the proportioning ratio of step b cement mortar, and take coconut shell fiber according to the add-on of coconut shell fiber in cement mortar in addition;

[0033] ② Soak the weighed coconut shell fiber i...

Embodiment 2

[0036] The present invention utilizes coconut shell fiber to prepare the method for anti-cracking low-shrinkage cement mortar, and this preparation method comprises the following steps:

[0037] a. Processing of coconut shell fiber:

[0038] First, clean the coconut shell fiber, then dry it (dry in an oven, the drying temperature is 60°C, and the drying time is 2.5 hours), and cut it into 8-12mm coconut shell fiber after drying;

[0039] b. Preparation of cement mortar:

[0040] 1m 3 Cement mortar is prepared from 720kg of raw cement, 1080kg of sand and 360kg of water; 1m 3 The addition of coconut shell fiber in the cement mortar is 0.8kg;

[0041] c. Preparation of anti-cracking low-shrinkage cement mortar:

[0042] 1. first take cement, sand and water according to the proportioning ratio of step b cement mortar, and take coconut shell fiber according to the add-on of coconut shell fiber in cement mortar in addition;

[0043] ② Soak the weighed coconut shell fiber in wat...

Embodiment 3

[0046] The present invention utilizes coconut shell fiber to prepare the method for anti-cracking low-shrinkage cement mortar, and this preparation method comprises the following steps:

[0047] a. Processing of coconut shell fiber:

[0048] First, clean the coconut shell fiber, then dry it (dry in an oven, the drying temperature is 60°C, and the drying time is 2 hours), and cut it into 8-12mm coconut shell fiber after drying;

[0049] b. Preparation of cement mortar:

[0050] 1m 3 Cement mortar is prepared from 720kg of raw cement, 1080kg of sand and 360kg of water; 1m 3 The addition amount of coconut shell fiber in the cement mortar is 1.0kg;

[0051] c. Preparation of anti-cracking low-shrinkage cement mortar:

[0052] 1. first take cement, sand and water according to the proportioning ratio of step b cement mortar, and take coconut shell fiber according to the add-on of coconut shell fiber in cement mortar in addition;

[0053] ② Soak the weighed coconut shell fiber in ...

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Abstract

The invention discloses a method for preparing cracking-resistant low-shrinking cement mortar with modified coconut fibers. The method includes the steps that coconut fibers are washed to be clean, added into a mixed solution of a NaOH solution and H2O2, soaked and subjected to heat treatment, heat treatment is carried out, then washing, drying and shearing are sequentially carried out, and the modified coconut fibers are obtained; cement mortar is prepared, and the added modified coconut fibers are weighed; the modified coconut fibers are fully subjected to water absorption, and water-saturated modified coconut fibers are obtained; the parts of weighed cement and sand are mixed to be even, then the water-saturated modified coconut fibers are added, residual cement and sand are added in batches in the fiber adding process, water is finally added, and the mixture is fully stirred; the modified coconut fibers are evenly dispersed in the cement mortar, and the cracking-resistant low-shrinking cement mortar is obtained. According to the method, the coconut fibers are modified to be added into the cement mortar, the cracking resistance of the cement mortar can be improved, and meanwhile the air shrinkage value of the cement mortar can be further reduced.

Description

1. Technical field: [0001] The invention belongs to the technical field of building materials, and in particular relates to a method for preparing crack-resistant and low-shrinkage cement mortar by using modified coconut shell fibers. 2. Background technology: [0002] Cement mortar is a kind of brittle material, which is mainly used in places such as construction projects (such as building houses). The main raw materials of cement mortar are composed of cement, sand and water. It has high compressive strength, low tensile strength, and large shrinkage deformation. As the strength level increases, the tension-compression ratio decreases, that is, the brittleness becomes greater. Therefore, cement mortar is very easy to crack, especially when it is used for plastering, which is very unfavorable. At present, there are many methods to improve the early crack resistance of cement mortar. For example, adding polypropylene fiber, carbon fiber and other materials to cement mortar ...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B18/24C04B20/10C04B20/04C04B111/20
CPCC04B20/1066C04B28/00C04B2111/2038C04B18/248C04B14/06C04B20/1055C04B20/04Y02W30/91
Inventor 赵玉青刘小广吴利凯成英豪刘光炎张书铭郑兵兵徐艳红黄蒙杨杰龙
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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