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Determination method for pervious cement concrete closed porosity

A technology of closed pores and permeable cement, which is applied in the field of concrete, can solve the problems of reduced compressive strength and inability to obtain more in-depth research between strengths, and achieve a strong theoretical effect

Inactive Publication Date: 2016-12-21
SHANDONG UNIV OF SCI & TECH
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Permeable pavement usually contains 15%~25% connected pores to ensure its water permeability, but the compressive strength value of the specimen is closely related to the pores of the specimen. Generally speaking, the greater the porosity, the greater the compressive strength of the specimen. will decrease accordingly
At present, the measurement of porosity is only the measurement of connected pores, and there is no effective method for measuring closed pores at home and abroad, which makes it impossible to get more in-depth research on the relationship between closed porosity and the strength of concrete specimens

Method used

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  • Determination method for pervious cement concrete closed porosity
  • Determination method for pervious cement concrete closed porosity
  • Determination method for pervious cement concrete closed porosity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0005] 1. Calculate the porosity P of the specimen.

[0006]

[0007] In the formula: P - porosity of the test piece (%);

[0008] —The theoretical maximum relative density of the mixture, dimensionless;

[0009] —The bulk relative density of the specimen, dimensionless.

[0010] 1.1 Calculate the theoretical maximum relative density .

[0011] 1.1.1 Instrument and material technical requirements.

[0012] 1) Balance: When weighing more than 5kg, the sensitivity is not greater than 0.1g; when weighing less than 2kg, the sensitivity is not greater than 0.05g.

[0013] 2) Negative pressure container: choose any type of A, B, or C according to the number of samples. There is a rubber stopper at the mouth of the negative pressure container, and the rubber tube is connected to the top, and there is a filter screen under the mouth to prevent the fine material from entering the suction hose. In order to facilitate the observation of air bubbles during vacuuming, at leas...

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Abstract

The invention discloses a determination method for pervious cement concrete closed porosity. The bulk density of a test piece is measured by a test method and maximum theoretical relative density of a concrete sample is measured, then the voidage of the test piece can be calculated. Then a connected porosity of the test piece is acquired by a test method, and calculation is carried out to obtain the closed porosity of the test piece. The test piece used by the method provided by the invention can be an irregularly shaped test piece, and breaks the constraint that only regular standard test pieces can be used in previous tests. The method provided by the invention fills the blank of determination method for pervious cement concrete closed porosity, and lays the foundation for future development of closed porosity related subjects.

Description

technical field [0001] The patent of the invention relates to the related technical field of concrete, and is mainly used for measuring the closed porosity of permeable cement concrete specimens. Background technique [0002] The country vigorously promotes the process of "sponge city". Sponge city refers to the effective control of rainwater runoff by strengthening the management of urban planning and construction, giving full play to the absorption, storage and slow release of rainwater by ecological systems such as buildings, roads, green spaces, and water systems. Realize the urban development mode of natural accumulation, natural infiltration and natural purification. The promotion of permeable cement concrete pavement is one of the important means to control urban surface runoff and conserve groundwater sources. Permeable cement concrete is a kind of porous concrete. The pores include connected pores and closed pores. Generally speaking, permeable cement concrete refer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
CPCG01N15/0893
Inventor 单景松王敏徐昌
Owner SHANDONG UNIV OF SCI & TECH
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