Method for determining stable MgO doped amount of hydraulic concrete in sand simulation way
A technology for hydraulic concrete and stable dosage, which is applied in the field of water conservancy and hydropower engineering concrete, can solve the problems that the expansion volume cannot be fully achieved, is not ideal, and achieves the effects of increasing the stable dosage of MgO, intuitive judgment and easy operation.
Active Publication Date: 2015-01-28
GUIZHOU NORMAL UNIVERSITY
View PDF2 Cites 10 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Although the stable content of MgO determined by the "stone powder simulation method" is higher than that of the existing method, it still cannot fully meet the expansion required by the design.
Therefore, the existing method for determining the stable content of MgO in hydraulic concrete is still not ideal and needs further improvement.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0012] Below, the present invention will be further described in conjunction with examples.
[0013] Example of the present invention: when implementing a kind of sand simulation mode of the present invention to determine the method of MgO stable dosage in hydraulic concrete, the raw materials and the mix ratio that its concrete specimen adopts are all the same as the prior art, and the used MgO MgO is specially used for hydraulic concrete, and its firing temperature is 1050 ° C ~ 1150 ° C; when determining the stable MgO content of hydraulic concrete mixed with cement, admixture, sand and gravel aggregate, water and other raw materials, use The concrete mix ratio to be used in the actual project is used to prepare concrete specimens, but the coarse aggregate (ie stone) in the concrete needs to be replaced by sand of equal quality (the sand used is the sand used in the corresponding project, and its fineness modulus should be controlled at 2.2 to 2.8), and then add MgO to ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a method for determining the stable MgO doped amount of hydraulic concrete in a sand simulation way. The method comprises the steps of replacing coarse aggregates, namely stones in concrete with sand with the same weight when determining the stable MgO mixing amount of hydraulic concrete, adding MgO into the concrete by using a conventional method, and preparing a concrete sample; after curing and carrying out constant-temperature treatment on the concrete sample, measuring the initial length Ls of the concrete sample; after boiling, autoclaving, cooling and carrying out constant-temperature treatment, measuring the length Lf of the concrete sample, and dividing the effective length 250mm of the sample by using the difference between Lf and Ls to obtain the autoclave expansion ratio of the sample; and then, drawing a curve with the autoclave expansion ratio changed along with the MgO mixing amount according to the autoclave expansion ratios of concrete samples with different MgO mixing amounts, and taking the MgO mixing amount corresponding to the inflection point with the maximum curvature on the curve as the stable MgO mixing amount of the corresponding hydraulic concrete. By using the method, the stable MgO mixing amount of the hydraulic concrete can be further increased scientifically and reasonably.
Description
technical field [0001] The invention relates to a method for determining the stable content of MgO in hydraulic concrete by adopting a sand simulation method, and belongs to the technical field of hydraulic and hydropower engineering concrete. technical background [0002] The external MgO concrete mixed with a certain amount of special magnesium oxide (MgO) in the hydraulic concrete has good delayed micro-expansion characteristics. Utilizing this feature can significantly improve the crack resistance of hydraulic concrete, simplify the construction of concrete retaining dam projects, shorten the construction period of water conservancy and hydropower projects, and save project investment. At present, the method used to determine the stability of MgO in hydraulic concrete is to refer to "Test Method for Cement Pressure Steam Stability (GB / T750-1992)" (hereinafter referred to as "GB / T750-1992"). That is: the mixing and forming of the cement paste test piece shall be carried ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): C04B28/00C04B22/06
Inventor 陈昌礼
Owner GUIZHOU NORMAL UNIVERSITY