Cement mortar for repairing corrosion damage of concrete structure and preparation method of cement mortar

A technology for concrete structure and damage repair, applied in the field of building materials, can solve the problems of potential threats to human health and environmental protection, effective implementation of corroded concrete repair work, lack of pertinence and effectiveness of material properties, etc., to achieve the adaptability of cement Good, excellent bonding performance, high density effect

Active Publication Date: 2014-08-06
CCCC CIVIL ENG SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Nowadays, the cement-based mortar repair materials commonly used in my country for concrete corrosion damage have outstanding mechanical properties such as compressive strength and flexural strength. However, for the special corrosion damage characteristics of concrete, the material properties lack pertinence and effectiveness. The repair function is only to protect However, the problem of repair failure caused by poor corro

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] Step 1: Weigh the raw materials according to the proportioning ratio of the following parts by weight:

[0078] Portland cement 300 parts;

[0079] 40 parts of fly ash;

[0080] 20 parts of silica fume;

[0081] 600 parts of quartz sand;

[0082] 30 parts of expansion agent;

[0083] 6 parts of water reducing agent;

[0084] 1 part rust inhibitor;

[0085] And the mixing water that accounts for 15% of the total weight fraction of the mixture;

[0086] Dissolve water reducing agent and rust inhibitor in 30-40% mixing water, stir for 1-2 minutes until standing without precipitation;

[0087] Step 2: Put Portland cement, fly ash, silica fume, quartz sand, and expansion agent into the mixer in proportion to dry mixing for 1-2 minutes, then add the liquid obtained in step 1 and mix for 2-3 minutes.

[0088] Step 3: Add the remaining mixing water into the solid-liquid mixture obtained in Step 2 and stir for 2-3 minutes.

[0089] in:

[0090] The Portland cement is P....

Embodiment 2

[0106] Step 1: Weigh the raw materials according to the proportioning ratio of the following parts by weight:

[0107] Portland cement 315 parts;

[0108] 35 parts of fly ash;

[0109] 25 parts of silica fume;

[0110] 575 parts of quartz sand;

[0111] 35 parts of expansion agent;

[0112] 5 parts of water reducer;

[0113] 2 parts of rust inhibitor;

[0114] And account for the mixing water of 13% of the total weight fraction of the mixture;

[0115] Dissolve water reducing agent and rust inhibitor in 30-40% mixing water, stir for 1-2 minutes until standing without precipitation;

[0116] Step 2: Put Portland cement, fly ash, silica fume, quartz sand, and expansion agent into the mixer in proportion to dry mixing for 1-2 minutes, then add the liquid obtained in step 1 and mix for 2-3 minutes.

[0117] Step 3: Add the remaining mixing water into the solid-liquid mixture obtained in Step 2 and stir for 2-3 minutes.

[0118] in:

[0119] The Portland cement is P.O 42.5...

Embodiment 3

[0135] Step 1: Weigh the raw materials according to the proportioning ratio of the following parts by weight:

[0136] Portland cement 330 parts;

[0137] 30 parts of fly ash;

[0138] 30 parts of silica fume;

[0139] 550 parts of quartz sand;

[0140] 40 parts of expansion agent;

[0141] 4 parts of water reducing agent;

[0142] 3 parts of rust inhibitor;

[0143] And the mixing water that accounts for 11% of the total weight fraction of the mixture;

[0144] Dissolve water reducing agent and rust inhibitor in 30-40% mixing water, stir for 1-2 minutes until standing without precipitation;

[0145] Step 2: Put Portland cement, fly ash, silica fume, quartz sand, and expansion agent into the mixer in proportion to dry mixing for 1-2 minutes, then add the liquid obtained in step 1 and mix for 2-3 minutes.

[0146] Step 3: Add the remaining mixing water into the solid-liquid mixture obtained in Step 2 and stir for 2-3 minutes.

[0147] in:

[0148] The Portland cement i...

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PUM

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Abstract

The invention relates to cement mortar for repairing corrosion damage of a concrete structure and a preparation method of the cement mortar. At present, a cement-based mortar repair material which is generally used aiming at the concrete corrosion damage lacks pertinence and effectiveness for corrosion damage, and a repair failure problem still exists. The method comprises the following steps: dissolving a water reducing agent and a corrosion inhibitor into mixing water, and stirring and standing without precipitation; putting Portland cement, flyash, silica fume, quartz sand and an expanding agent into a stirring machine in proportion for dry stirring, and then adding the liquid for mixing and stirring for 2-3 minutes; adding the mixing water for stirring to obtain the cement mortar. The compound corrosion inhibitor adopted by the invention is good in cement adaptability, has good compatibility with additives such as the water reducing agent and the expanding agent, has no adverse effect on the strength of materials, and can improve the mobility of mixtures. The mortar has high matrix density, good antiseptic and corrosion-inhibiting capacity and good bonding performance, volume stability and constructability.

Description

Technical field [0001] The present invention is the field of building materials technology, which involves a concrete mortar and preparation methods for the repair of corrosion damage for concrete structures. Background technique [0002] Reinforced concrete is the most widely used type of building materials in highways, bridges and industrial construction engineering. With the increase of structural materials, the problem of durability degradation is increasingly prominent.The results of the durability of concrete show that reinforced concrete corrosion damage is the main durability disease, which has an impact on the structural level exceeding the frozen melting cycle and sulfate erosion.The degradation method of rust damage is the expansion stress caused by rust products, reducing the bonding performance of reinforced and concrete. At the same time, expansion stress will cause the concrete surface to produce cracked tendon cracks or protective layers of bloating and peeling. T...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B18/08C04B14/06
CPCY02W30/91
Inventor 葛胜锦翟敏刚吕晓霞潘长平李翔汪明天赵秋华
Owner CCCC CIVIL ENG SCI & TECH
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