High-flow-state and high-strength non-shrinkage grouting material and preparation method thereof

A non-shrinkage, grouting material technology, applied in the field of construction, can solve the problems of affecting structural safety, poor material homogeneity, and low strength in the later stage, so as to promote continuous hydration, increase water absorption and water retention characteristics, and improve brittleness Effect

Active Publication Date: 2017-05-31
CHINA STATE CONSTR READY MIXED CONCRETE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are certain deficiencies in the use of conventional grouting materials. In the projects of foundation reinforcement, road repair, secondary injection, post-tensioning prestressed pipeline grouting of highway bridges, grouting materials generally have short operability time, low strength in the later stage, Problems such as large shrinkage, poor material homogeneity, and excessive bleeding rate will affect the safety of the structure

Method used

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  • High-flow-state and high-strength non-shrinkage grouting material and preparation method thereof
  • High-flow-state and high-strength non-shrinkage grouting material and preparation method thereof
  • High-flow-state and high-strength non-shrinkage grouting material and preparation method thereof

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preparation example Construction

[0034] The preparation process of the composite anti-segregation agent: pass the sepiolite powder through a 325-mesh sieve, add it into a CaCl salt solution with a mass concentration of 5%, mix and stir, add xanthan gum, and the mass ratio of xanthan gum to sepiolite is 1 :5~1:20, stirring and beating, and heating to 60°C, then adding the initiator (NH 4 ) 2 S 2 o 8 , so that the addition of initiator (NH 4 ) 2 S 2 o 8 The mass ratio of xanthan gum to xanthan gum is 1:100-1:250. After reacting for 2 hours, the product solution is dried in a vacuum drying oven at 60°C and crushed to prepare a composite anti-segregation agent.

[0035] The inorganic modified sepiolite powder is a kind of porous inorganic mineral fiber, the fiber length is mostly 10 μm, the internal micropores are many, the specific surface area is large, and the specific surface area is greater than 4750m 2 .kg -1 .

Embodiment 1

[0039] A high-fluidity high-strength non-shrinkage grouting material, the components of which are calculated by mass percentage:

[0040] Ordinary 42.5 grade Portland cement 30%;

[0041] Mineral admixture 14%;

[0042] Dolomite composite powder 3.3%;

[0043] Composite expansion agent 2%;

[0044] Washed sand 50%;

[0045] Polycarboxylate superplasticizer 0.5%;

[0046] Builder 0.2%.

[0047] The preparation method of the large-flow high-strength non-shrinkage grouting material described in this example includes the following steps: weighing the synergist and the polycarboxylate superplasticizer according to the mass ratio, and first using a small dry powder mixer to mix for 3 minutes~ 5min, then weigh the components of the cementitious material and the aggregate according to the mass ratio, and then put them into the mixer and stir for 30min to 50min to make a large fluid, high-strength, non-shrinking dry powder grouting material; when using, add 10wt of the dry powder ...

Embodiment 2

[0049] A high-fluidity high-strength non-shrinkage grouting material, the components of which are calculated by mass percentage:

[0050] Ordinary 42.5 grade Portland cement 40%;

[0051] Mineral admixture 6%;

[0052] Dolomite composite powder 5.9%;

[0053] Composite expansion agent 2%;

[0054] Washed sand 45%;

[0055] Polycarboxylate superplasticizer 0.6%;

[0056] Builder 0.5%.

[0057] The preparation method of the large-flow high-strength non-shrinkage grouting material described in this example includes the following steps: weighing the synergist and the polycarboxylate superplasticizer according to the mass ratio, and first using a small dry powder mixer to mix for 3 minutes~ 5min, then weigh the components of the cementitious material and the aggregate according to the mass ratio, and then put them into the mixer and stir for 30min to 50min to make a large fluid, high-strength, non-shrinking dry powder grouting material; when using, add 10wt of the dry powder g...

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Abstract

The invention belongs to the field of buildings, and particularly relates to a high-flow-state and high-strength non-shrinkage grouting material and a preparation method thereof. The grouting material is prepared from the following components in percentage by mass: 30-45% of cement, 5-20% of a mineral admixture, 3-10% of dolomite composite powder, 2-8% of a composite expansion agent, 40-55% of aggregates, 0.2-1.0% of a polycarboxylate superplasticizer and 0.2-1.5% of a synergistic additive. Through a powder system and a close packing technology of the aggregates, the fluidity and the strength are improved; through introduction of the synergistic additive, moisture distribution is adjusted through thickening of a composite anti-segregation agent and water absorption and water release effects, so that the problems of high-flow-state grouting material segregation and bleeding and sensitive water consumption are solved; and adjustment of the expansion properties at different stages is carried out through introducing a plastic expansion agent and the composite expansion agent, so that the problems of shrinkage and sedimentation of the grouting material are solved.

Description

technical field [0001] The invention belongs to the field of construction, and in particular relates to a large-flow high-strength non-shrinkage grouting material and a preparation method thereof. Background technique [0002] With the development of my country's economy and the massive construction of infrastructure, many existing buildings are in urgent need of reinforcement and renovation, whether in terms of appearance or function; large or extra-large equipment used in industries such as aviation, electric power, and machinery need to be improved. Installation accuracy, speed up installation; and the construction of large-scale transportation facilities such as bridges and railways, put forward higher requirements for the tension quality and durability of prestressed beams and slabs, and the performance and quality of grouting materials are the main factors affecting project quality. , thus putting forward higher performance requirements for grouting materials. At presen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B28/06C04B18/14C04B18/08C04B18/12C04B14/46C04B24/38
CPCC04B14/4643C04B18/08C04B18/082C04B18/12C04B18/141C04B18/146C04B24/38C04B28/04C04B28/06C04B2201/50C04B14/06C04B22/066C04B22/14C04B22/124C04B22/147C04B24/24C04B2103/0068C04B24/42Y02W30/91
Inventor 吴雄贾丽莉彭园林家超代瑞平
Owner CHINA STATE CONSTR READY MIXED CONCRETE CO LTD
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