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A viscosity modifying material specially used for self-compacting concrete for CRTSIII type plates

A technology of self-compacting concrete and modified materials, which is applied in the field of new concrete materials, can solve the problems of poor passability of gaps, high sensitivity to water consumption, and poor system stability, so as to avoid laitance and buoyant layers and improve durability , Constant thixotropic performance

Active Publication Date: 2015-08-12
ANHUI ZHONGTIE ENGINEER MATERIAL SCI & TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to solve the construction problems of self-compacting concrete in CRTSⅢ-type slab filling layer and other thin-walled structures, and provides a special viscosity-modified material for CRTSⅢ-type slab self-compacting concrete, which can increase the yield stress of concrete without changing the concrete yield stress. The plastic viscosity of the self-compacting concrete solves the problems of poor fluidity, poor gap passage, poor system stability, and high sensitivity to water consumption under the condition of low expansion (600-630mm) of self-compacting concrete, and at the same time improves the thixotropy of self-compacting concrete Properties and role of internal bubble structure

Method used

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  • A viscosity modifying material specially used for self-compacting concrete for CRTSIII type plates
  • A viscosity modifying material specially used for self-compacting concrete for CRTSIII type plates
  • A viscosity modifying material specially used for self-compacting concrete for CRTSIII type plates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The ratio of viscosity-modified materials for new self-compacting concrete of CRTSⅢ type slab is shown in Table 1:

[0028] Table 1 Proportion of viscosity-modified materials for new self-compacting concrete of CRTSⅢ type slab

[0029] components Proportion(%) components Proportion(%) fumed silica 47 Low Viscosity Hydroxyethyl Cellulose 0.3 Nano Calcium Carbonate 49.1 High Viscosity Hydroxyethyl Cellulose 0.4 Polyamide 1.2 Water-soluble polymer rubber powder 2

[0030] Mixed self-compacting concrete uses the mix as shown in Table 2.

[0031] Table 2 The proportion of self-compacting concrete used in the test (unit: kg / m 3 )

[0032]

[0033] The properties of the self-compacting concrete prepared by mixing the viscosity-modified material in Example 1 and the concrete proportion in Table 1 are shown in Table 3.

[0034] Table 3 Properties of self-compacting concrete using viscosity-modified materials in Example 1

[003...

Embodiment 2

[0038] The ratio of viscosity-modified materials for new self-compacting concrete of CRTSⅢ type slab is shown in Table 4:

[0039] Table 4 Proportion of viscosity-modified materials for new self-compacting concrete of CRTSⅢ type slab

[0040] components Proportion(%) components Proportion(%) fumed silica 46.1 Low Viscosity Hydroxyethyl Cellulose 0.2 Nano Calcium Carbonate 50 High Viscosity Hydroxyethyl Cellulose 0.2 Polyamide 1.5 Water-soluble polymer rubber powder 2

[0041] The viscosity-modified material in Example 2 and the concrete ratio in Table 2 were used to mix and prepare self-compacting concrete, and the properties are shown in Table 5.

[0042] Table 5 Properties of self-compacting concrete using viscosity-modified materials in Example 1

[0043]

Embodiment 3

[0045] The ratio of viscosity-modified materials for new self-compacting concrete for CRTSⅢ type slabs is shown in Table 6:

[0046] Table 6 Proportion of viscosity-modified materials for new self-compacting concrete of CRTSⅢ type slab

[0047] components Proportion(%) components Proportion(%) fumed silica 48.6 Low Viscosity Hydroxyethyl Cellulose 0.2 Nano Calcium Carbonate 47 High Viscosity Hydroxyethyl Cellulose 0.2 Diureas 2 Water-soluble polymer rubber powder 2

[0048] The viscosity-modified material in Example 3 and the concrete ratio in Table 2 were used to mix and prepare self-compacting concrete, and the properties are shown in Table 7.

[0049] Table 7 Properties of self-compacting concrete using viscosity-modified materials in Example 1

[0050]

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Abstract

A preparing method of a viscosity modifying material specially used for self-compacting concrete for CRTSIII type plates is disclosed. The viscosity modifying material is prepared by fully mixing fumed silica, calcium carbonate, low-viscosity hydroxyethyl cellulose, high-viscosity hydroxyethyl cellulose, a thixotropy modifier and water-soluble polymer rubber powder. The viscosity modifying material comprises 45-55% by mass of the fumed silica, 43-55% by mass of nanometer calcium carbonate, 0-0.5% by mass of the low-viscosity hydroxyethyl cellulose, 0-0.5% by mass of the high-viscosity hydroxyethyl cellulose, 0-2% by mass of the thixotropy modifier and 2-4% by mass of the water-soluble polymer rubber powder.

Description

[technical field] [0001] The invention belongs to the technical field of new concrete materials, and in particular relates to the preparation of a special viscosity-modified material for CRTS III plate self-compacting concrete. [Background technique] [0002] CRTS Ⅲ ballastless track structure, as one of the track types of my country's railway passenger dedicated lines, is optimized and innovated on the basis of CRTS I and CRTS II slab ballastless tracks. It is a slab ballastless track structure with independent intellectual property rights in my country . The core technology of CRTSⅢ ballastless track structure is pouring self-compacting concrete into the track structure filling layer. Compared with the disadvantages of CA mortar, such as complex construction, high cost, and significant environmental impact on material performance, self-compacting concrete has the advantages of wide source of raw materials, stable mechanical properties, low cost, on-site laying construction...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/38C04B22/10C04B22/06
Inventor 黄海陈钱宝徐涛陈雷梅晓君宿万汪志勇许立
Owner ANHUI ZHONGTIE ENGINEER MATERIAL SCI & TECH CO LTD
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