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Fast concrete road and bridge repairing material

A technology for repairing materials and concrete, applied in the cement field of building materials, can solve problems such as special products and technologies that have not yet been formed, and achieve the effects of increasing flexural strength, improving toughness, and accelerating construction speed.

Inactive Publication Date: 2002-07-10
李乃珍
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, special materials and various admixtures are also used to prepare quick-hardening and high-strength concrete to meet urgent needs, but a special product and technology has not yet been formed.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0016] The fast hardening sulphoaluminate cement used in the manufacture of this material has a label no less than 525 # ; Portland cement, the strength grade is not less than 42.5MPa, and ordinary Portland cement with appropriate composition and the same strength grade can also be used; the chemical composition of the two cements is listed in Table 1. The water reduction rate of the naphthalene series superplasticizer is not less than 25%, and the lithium salt and boric acid are all commercially available industrial grade commodities. The formulations of the examples are listed in Table 2, the main chemical components are listed in Table 3, and the test results of 1:2.5 mortar and concrete are listed in Table 4. The 7-day limiting expansion rate of the mortar in water is 0.018% to 0.022%.

[0017] Item

[0018] Item

[0019] Naphthalene series superplasticizer can be NF, FDN or UNF; lithium salt can be Li 2 CO 3 Or LiCi. According to the cement fineness inspec...

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PUM

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Abstract

The fast concrete road and bridge repairing material has the composition of:early strength aluminosulfate cement 75-95 wt%, portland cement 5-25 wt%, naphthalene water reducing agent 1.5-3.5 wt%, lithium salt below 0.5 wt% and boric acid below 0.5 wt%. it has the features of fast solidification, fast hardening, high strength, less swelling, corrosion resistance, etc. It is used in mixing mortar and concrete without need of other supplementary material. It results in 4H break strength higher than 4 MPa and compression strength higher than 25 MPa of mortar as well as 6H break strength higher than 4 MPa and compression strength higher than 30 MPa of concrete. When used to repair road and bridge, the traffic may be opened after 6 h. It may be also used in reinforcement of other concrete member.

Description

Technical field [0001] The invention is a quick repair material for concrete roads and bridges, and belongs to the technical field of cement for building materials. Background technique [0002] Among highways, expressways, highways and railway bridges, concrete pavements and bridges account for a considerable proportion. With the rapid development of the national economy, the speed of vehicles has increased, the number of vehicles has increased, and the carrying capacity has increased. The damage to the old roads and bridges has accelerated and the degree of damage has increased. It must be repaired, maintained, and reinforced in time. The use of ordinary concrete materials and techniques for repairing will block traffic due to slow performance of strength and long maintenance time. Therefore, people have studied a variety of repair materials through the analysis and evaluation of the damage. There are rapid repair agents, ultra-early-strength concrete, polymer concrete, steel f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/06
CPCC04B28/065C04B2111/0075C04B2111/72C04B2103/0008
Inventor 李乃珍谢敬坦张志征张立新蒋琨
Owner 李乃珍
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