Joint mortar for improving durability of new and old concrete joint surface

A new and old concrete, joint surface technology, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., to achieve the effect of simple production method, high ball effect, and improved compactness

Active Publication Date: 2022-08-09
NANJING HYDRAULIC RES INST +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the deficiencies of the existing joint mortar, the present invention provides a joint mortar for improving the durability of the new-old concrete joint surface and its preparation method, which can improve the durability of the new-old concrete interface when applied to the construction joint

Method used

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  • Joint mortar for improving durability of new and old concrete joint surface
  • Joint mortar for improving durability of new and old concrete joint surface
  • Joint mortar for improving durability of new and old concrete joint surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A joint mortar for improving the durability of new and old concrete joint surfaces. parts, 3 parts of modified fibers, and 5 parts of polycarboxylate powder water reducing agent. Weigh the mixing water according to the water-to-binder ratio of 0.47, 0.43 and 0.37, and mix the mortar and mixing water evenly before use.

[0035] Among them, the mineral admixture is composed of fly ash, fly ash microbeads and nano-SiO 2 According to the mass ratio of 40:40:20, the fly ash is grade I ash, the water demand ratio of fly ash microbeads is 84%, the activity index is 88%, and the nano-SiO 2 Specific surface area 200m 2 / g.

[0036]The self-healing microcapsules are prepared according to the following method: (1) Preparation of capsule core: put 100 parts of repairing agent into the disc granulator, set the rotation speed of the drum to 35 rpm, and simultaneously add 20 parts of water by spraying, Make the repairing agent powder agglomerate into a spherical shape as the core ...

Embodiment 2

[0039] A joint mortar for improving the durability of new and old concrete joint surfaces. parts, 3 parts of modified fibers, and 5 parts of polycarboxylate powder water reducing agent. Weigh the mixing water according to the water-to-binder ratio of 0.47, 0.43 and 0.37, and mix the mortar and mixing water evenly before use.

[0040] Among them, the mineral admixture is composed of fly ash, fly ash microbeads and nano-SiO 2 According to the mass ratio of 35:45:20, the fly ash is grade I ash, the water demand ratio of fly ash microbeads is 84%, the activity index is 88%, and the nano-SiO 2 Specific surface area 200m 2 / g.

[0041] The self-healing microcapsules are prepared according to the following method: (1) Preparation of capsule core: put 100 parts of repairing agent into the disc granulator, set the rotation speed of the drum to 65 rpm, and simultaneously add 30 parts of water by spraying, Make the repair agent powder agglomerate into a spherical shape as the core of...

Embodiment 3

[0044] A joint mortar for improving the durability of new and old concrete joint surfaces. parts, 3 parts of modified fibers, and 5 parts of polycarboxylate powder water reducing agent. Weigh the mixing water according to the water-to-binder ratio of 0.47, 0.43 and 0.37, and mix the mortar and mixing water evenly before use.

[0045] Among them, the mineral admixture is composed of fly ash, fly ash microbeads and nano-SiO 2 According to the mass ratio of 45:35:20, the fly ash is grade I ash, the water demand ratio of fly ash microbeads is 84%, the activity index is 88%, and the nano-SiO 2 Specific surface area 200m 2 / g.

[0046] The self-healing microcapsules are prepared according to the following method: (1) Preparation of capsule core: put 100 parts of repairing agent into the disc granulator, set the rotation speed of the drum to 65 rpm, and simultaneously add 30 parts of water by spraying, Make the repair agent powder agglomerate into a spherical shape as the core of...

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Abstract

The invention provides joint mortar for improving durability of a new and old concrete joint surface, and relates to the technical field of concrete construction, the joint mortar comprises the following raw materials by weight: 300-500 parts of Portland cement, 60-150 parts of a mineral admixture, 500-900 parts of quartz sand, 50-100 parts of a self-repairing microcapsule, 3-8 parts of modified fiber, and 5-20 parts of a polycarboxylic acid powder water reducer. According to the new and old concrete pouring time interval, the water-binder ratio of the joint mortar at different pouring time differences is reasonably determined, and the joint quality of the joint surface is effectively guaranteed. Through optimal design of the self-repairing microcapsules and the modified fibers, the bonding strength of the joint surface is improved, and the joint mortar is endowed with self-repairing capability and inhibits development of damage to the joint surface, so that the aim of improving the durability of the new and old concrete joint surface is fulfilled.

Description

technical field [0001] The invention relates to the technical field of concrete construction, in particular to a joint mortar for improving the durability of new and old concrete joint surfaces. Background technique [0002] Construction joint refers to the joint formed between the concrete poured first and last due to design requirements or construction needs in the process of concrete pouring. The joint surface of new and old concrete at the construction joint is a weak part in the engineering structure, which is very prone to damage and failure. In fact, as long as the time interval between two-layer concrete pouring exceeds the initial setting time of the earlier poured concrete, there will be interfacial bonding problems. On the joint surface of new and old concrete, the degree of cement hydration in the old concrete is high, and it is difficult to hydrate and integrate with the new concrete, and the old concrete base has a certain water absorption, which reduces the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B111/20C04B111/27
CPCC04B28/04C04B2201/10C04B2111/27C04B2111/20C04B18/08C04B14/06C04B14/46C04B24/42C04B22/141C04B18/146C04B22/066C04B18/141C04B22/00C04B24/383C04B7/32C04B22/10C04B2103/302Y02W30/91
Inventor 夏强祝烨然杜志芹嵇旭红饶志刚袁媛刘兴荣温金保唐修生徐志峰蔡明李建王松季海
Owner NANJING HYDRAULIC RES INST
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