Resistivity-based cement hydration degree dynamic monitoring system and method
A cement hydration and dynamic monitoring technology, applied in the direction of material resistance, etc., to achieve the effect of dynamic monitoring, simple equipment, and improved accuracy
Active Publication Date: 2018-12-14
ZHEJIANG UNIV
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However, there is no literature that discloses the detection method of directly obtaining the degree of cement hydration through resistivity measurement.
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[0074] Ordinary Portland cement is one of the most commonly used building materials. Measuring the hydration degree and resistivity development of cement slurry during the hydration process is of great significance for characterizing its early working performance and later mechanical properties. The invention is used to measure the resistivity change of the cement slurry in the hydration process, and predict the development of the hydration degree based on the resistivity.
[0075] The water-cement ratio of cement slurry is 0.35 and 0.45, which are marked as P35 and P45 respectively. Ordinary Portland cement is used as cement with a strength grade of 52.5. The mineral components of the cement are: tricalcium silicate accounts for 65.78%, dicalcium silicate accounts for 7.75%, tetracalcium aluminate accounts for 6.94%, tetracalcium aluminoferrite accounts for 8.64%, gypsum accounted for 6.99%. The water was deionized to avoid the introduction of additional ions.
[0076] The ...
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The invention relates to the technical field of building material detection, and aims to provide a resistivity-based cement hydration degree dynamic monitoring system and method. The system comprisesa non-contact resistivity instrument, an embedded temperature sensor and a computer; a cement hydration degree processing analysis module is embedded in the computer; the computer is connected to an alternating-current generator of the non-contact resistivity instrument through a signal line; and the non-contact resistivity instrument and the embedded temperature sensor are connected to the computer through signal lines. According to the dynamic monitoring system and method, the influence of the temperature on the resistivity can be effectively corrected, and the resistivity change of a pore solution, the density change of hydrated calcium silicate gel and the saturation change in hydration of a cement-based material are considered, so that the hydration degree of neat cement paste is accurately predicted, and a basis is provided for comprehensively describing and evaluating the characteristics of the cement-based material. The dynamic monitoring system and method is simple and convenient to operate, relatively high in precision, simple in device, low in cost and convenient to use and popularize in practical engineering.
Description
technical field [0001] The invention belongs to the technical field of building material detection, and in particular relates to a dynamic monitoring system and method for cement hydration degree based on resistivity. Background technique [0002] Cement-based materials are one of the most commonly used building materials in modern construction projects. Cement-based materials are composite materials composed of water, cementitious materials and aggregates (sand, stone), and their main strength comes from the hydration process of gelatinous materials. The performance of cement-based materials has obvious time-varying properties. With the continuous hydration process, the mechanical properties such as strength and elastic modulus, and the durability such as impermeability and chloride ion permeability of cement-based materials continue to increase. The hydration process of cement-based materials is a complex physical and chemical change, so measuring the properties of cement...
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IPC IPC(8): G01N27/06
CPCG01N27/06
Inventor 田野田卒士金南国金贤玉
Owner ZHEJIANG UNIV