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Micro-expansive coral sand concrete and preparation method thereof

A coral sand and micro-expansion technology, applied in the field of building materials, can solve the problems of poor long-term durability of coral sand concrete, poor volume stability of concrete, rapid drying shrinkage due to water demand, etc., to improve drying shrinkage and volume stability, guaranteeing Volume stability, the effect of compensating for porosity

Inactive Publication Date: 2016-08-10
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the prepared coral sand concrete has the advantages of light weight and good thermal insulation performance, but due to the large water demand, it is easy to cause defects such as rapid drying shrinkage, low strength and poor concrete volume stability, which will affect the coral sand concrete. adverse effect on the long-term durability of the

Method used

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  • Micro-expansive coral sand concrete and preparation method thereof
  • Micro-expansive coral sand concrete and preparation method thereof
  • Micro-expansive coral sand concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Add 115 parts of stearic acid, 120 parts of sodium hydroxide, and 0.5 parts of absolute ethanol into the flask, heat and stir evenly, control the heating temperature to 70°C, and the reaction time is 7h;

[0032] Add saturated sodium chloride to precipitate sodium stearate, raise the temperature to 85°C, add 0.08 parts of aliphatic amine polyoxyethylene ether, 0.03 parts of alkylbenzene sulfonate, fully react for 1 hour, and then cool to room temperature;

[0033] Add 50 parts of hydrochloric acid to neutralize until the pH is 6.7, and filter to separate and remove impurities to obtain an emulsion, which is the liquid expansion agent.

Embodiment 2

[0035] Add 96 parts of oleic acid, 105 parts of sodium hydroxide, 0.2 parts of absolute ethanol, and 0.1 part of ethylene glycol into the flask, heat and stir evenly, control the heating temperature to 65°C, and the reaction time to 6.5h;

[0036] Add saturated sodium chloride to precipitate sodium stearate, raise the temperature to 90°C, add 0.05 parts of alkylphenol polyoxyethylene ether and 0.04 parts of fatty alcohol polyoxyethylene ether, 0.02 parts of alkylbenzene sulfonate and 0.03 parts The alkylnaphthalene sulfonate, fully reacted for 1.5h and then cooled to room temperature;

[0037] Add 45 parts of hydrochloric acid to neutralize until the pH is 6.9, and filter to separate and remove impurities to obtain an emulsion, which is the liquid expansion agent.

Embodiment 3

[0039] Add 85 parts of oleic acid and 35 parts of linoleic acid, 130 parts of sodium hydroxide, 0.5 parts of ethylene glycol and 0.3 parts of propylene glycol into the flask, heat and stir evenly, control the heating temperature to 70°C, and the reaction time is 7h ;

[0040] Add saturated sodium chloride to precipitate sodium stearate, raise the temperature to 85°C, add 0.03 parts of alkylphenol polyoxyethylene ether and 0.06 part of phenethylphenol polyoxyethylene ether, 0.05 part of alkyl sulfonate and 0.04 Parts of alkyl phosphate, fully reacted for 2h and then cooled to room temperature;

[0041] Add 70 parts of hydrochloric acid for neutralization until the pH is 6.8, and filter to separate and remove impurities to obtain an emulsion that is the liquid expansion agent.

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Abstract

The invention discloses a micro-expansive coral sand concrete and a preparation method thereof. The micro-expansive coral sand concrete is composed of the following components in parts by weight: 300-450 parts of cement, 15-45 parts of admixture, 600-725 parts of coral sand, 975-1150 parts of macadam, 165-205 parts of seawater, 3-7 parts of water reducing agent and 1.5-2.5 parts of liquid expanding agent. The main component of the liquid expanding agent is an emulsion generated by saponifying higher fatty acids. The novel concrete admixture liquid expanding agent is utilized to obviously enhance and improve the dry shrinkage and volume stability of the concrete. The double expansion effects sufficiently enhance the compactness of the concrete, and effectively repair and improve the porosity of the concrete, thereby ensuring the volume stability of the coral sand concrete.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a micro-expansion coral sand concrete and a preparation method thereof. Background technique [0002] Since the invention and application of cement concrete materials, its research and application have experienced nearly 200 years of development. Its application is very extensive, involving road, railway, bridge, tunnel, ocean and other engineering constructions. Especially in recent years, the country has attached great importance to and developed the island and reef resources of the South China Sea, which makes concrete materials have a wider display stage in marine engineering. Affected by geographical location and environment, the resources on most islands and reefs in the South China Sea are yet to be developed and utilized. The construction of marine islands and reefs is inseparable from the use of concrete. A large amount of coral aggregates such as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/08C04B28/04C04B24/32C04B14/06C04B22/00
CPCC04B14/06C04B22/0026C04B28/04C04B28/08C04B40/0039C04B2201/50C04B18/146C04B14/04C04B24/08C04B2103/0068C04B7/02C04B14/106C04B24/24C04B18/141C04B24/00C04B24/085C04B22/062C04B24/02C04B22/124C04B24/32C04B24/20C04B22/122C04B24/16C04B24/003
Inventor 陈友治马章强孙涛
Owner WUHAN UNIV OF TECH
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