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Providing freezing and thawing resistance to cementitious compositions

A cohesive composition, the technology of the composition, is applied in the field of providing freezing and thawing resistance to the cohesive composition, which can solve the problems of inconsistent performance, affecting compressive strength, insufficient frost resistance of concrete, etc.

Inactive Publication Date: 2015-07-01
CONSTR RES & TECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the rules do require that special care be taken in the manufacture of this concrete, and that the air content be constantly checked, because if the air content is too low, the concrete will have insufficient frost resistance, and on the other hand, if the air content is too high, it will Adversely affects compressive strength
[0014] Prior art methods of controlling air porosity often result in inconsistent performance

Method used

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  • Providing freezing and thawing resistance to cementitious compositions
  • Providing freezing and thawing resistance to cementitious compositions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Example 1 - Disintegration rate: 4mm PLA beads at pH 10

[0064] Put solid polylactic acid (PLA) beads with a diameter of about 4 mm into NaOH alkaline solution (pH 10), and track and observe the degradation rate. The beads did not degrade because the pH of the solution was not high enough and did not reflect the actual cementitious composition void solution conditions. Additionally, since the rate of degradation is a function of surface area, these larger beads are expected to degrade relatively slower than properly sized particles.

Embodiment 2

[0065] Example 2 - Disintegration rate: 4mm PLA beads at pH 13

[0066] The solid polylactic acid beads were placed in a 25% NaOH solution at pH 13 in a glass bottle, which is a pH that better approximates the void solution conditions of the cementitious composition. On day 20, the beads were completely dissolved due to hydrolysis of the PLA polymer and formation of sodium lactate and lactide oligomers. The degradation time scale of PLA pellets is noteworthy in concrete applications.

Embodiment 3

[0067] Example 3 - Decomposition speed: PLA fiber samples

[0068] Solid polylactic acid (PLA) fibers of various lengths and widths of 40 micrometers were placed in a 1.3M NaOH solution and visually inspected to determine the relative degree of degradation. Both samples dissolved completely within two days. High temperatures (50°F, 70°F, 90°F) had no appreciable effect on the rate of dissolution measured by this method.

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Abstract

An improved freeze-thaw durability cementitious composition is provided that uses at least partially degradable polymeric particles that are blended directly into the cementitious composition mixture. The degradable polymeric particles provide void spaces in the cementitious material matrix, and such void spaces act to increase freeze-thaw durability of the cementitious material.

Description

[0001] The application date is June 9, 2006, the application number is 200680021060.5 (the international application number is PCT / EP2006 / 005541), and the invention name is "providing freezing and thawing resistance to the adhesive composition" patent for invention Divisional application of the application. [0002] Cross References to Related Applications [0003] This application claims the benefit of the filing date of US Provisional Patent Application Serial No. 60 / 690,237, filed June 14, 2005. Background of the invention [0004] It is well known that freeze and thaw cycles can be extremely detrimental to water saturated hardening cementitious compositions such as concrete. The most common technique to prevent or reduce the resulting damage is to incorporate microscopic pores or voids in the composition. The voids or pores act as internal expansion chambers and thus protect the concrete from freezing damage by relieving the hydraulic pressure caused by the advancing fre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B24/24
CPCC04B40/0641C04B28/02C04B2103/0064C04B2111/29C04B2103/0072C04B2111/34C04B16/04C04B2103/0074C04B20/002C04B2103/10C04B16/08C04B20/0036C04B2103/0088C04B2103/12C04B2103/22C04B2103/302C04B2103/304C04B2103/408C04B2103/54C04B2103/61C04B2103/65C04B24/18C04B24/223C04B24/226C04B24/2647C04B24/283C04B28/04
Inventor M.L.科恩斯
Owner CONSTR RES & TECH GMBH