Method for determining mixing amount of concrete internal curing material
A technology for determining methods within concrete, applied in the field of building materials, to achieve the effect of reducing the number of factors and having universality
Pending Publication Date: 2020-08-18
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
View PDF3 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004] Aiming at the defects and problems existing in the comprehensive performance evaluation method of internal curing concrete, the present invention provides a method for determining the content of internal curing materials in concrete
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 1
[0019] Embodiment 1: The method for determining the amount of curing material in concrete in this embodiment includes the following steps.
[0020] SAP and light aggregate (LWA) are selected as internal maintenance materials, and the maximum required internal maintenance water volume V is firstly limited according to the maximum internal maintenance water diversion formula W :
[0021]
[0022] Where: V W The maximum volume of water introduced / m 3 ; ρ W For the density of water, take 1000Kg / m 3 ;C f Cement consumption per unit volume of concrete / m 3 ; CS is the complete chemical shrinkage ratio of cement hydration process, α max Indicates the degree of hydration.
[0023] The mix ratio of the designed test block concrete is shown in Table 1, in which the water absorption rate of SAP is 25 times its mass, and the water release rate of lightweight aggregate is 10% of its mass. and LWA10 (additional addition of pre-absorbed water), the test groups that assumed that the...
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 belongs to the technical field of building materials, and particularly relates to a method for determining the mixing amount of a concrete internal curing material. The method comprisesthe following steps: firstly, testing by adopting different internal curing materials and different internal curing water introduction amounts, manufacturing a concrete test block, and measuring the indexes of compressive strength, self-shrinkage and frost resistance durability of a test piece; secondly, determining a subjective weight and an objective weight of the concrete internal curing comprehensive performance index by utilizing OWA and an entropy weight method respectively; then, the influence of subjective and objective weights is integrated to eliminate the influence of extreme valuesin subjective evaluation and overcome the defect that the importance degree of indexes cannot be reflected in objective evaluation; the method comprises the following steps: determining the comprehensive weight of an index, then sorting the comprehensive performance of test blocks of a test group by adopting improved Multimora, selecting an optimal group through a dominance theory, and reverselydeducing an optimal internal curing material, an optimal mixing amount and an optimal pre-water-absorption amount. According to the method, the advantages and disadvantages of the comprehensive performance of the internal curing concrete with any mixing ratio of the internal curing material to the introduced water amount can be determined, and the method has universality and has important significance in popularization and application of the internal curing technology.
Description
technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a method for determining the content of curing materials in concrete. Background technique [0002] At present, internal curing technology has been gradually used in social production. Internal curing technology refers to adding internal curing materials to concrete under certain pre-absorbing conditions. During the rapid hydration stage of cementitious materials, the internal humidity of concrete is increased by releasing water. Thereby promoting the hydration of cementitious materials and reducing the self-shrinkage of concrete, improving the comprehensive performance of concrete. In the actual production and test process, because the water release of the internal curing material in the hydration process of the cementitious material is difficult to obtain accurately, that is, the water absorption and water release are not equal, so only based on the theor...
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 Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/06G06Q50/08
CPCG06Q10/06393G06Q50/08
Inventor 钟凌郭利霞郭磊汪伦焰王明华曹永潇张芳芳
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER