Intelligent determination method of setting time of cement-based materials

Abstract

The invention relates to an intelligent measuring method for the setting time of a cement-based material. The measuring method comprises the following steps: providing an intelligent determinator for the setting time of the cement-based material, sampling the cement-based material out from a stirring machine, and putting an inner container of the intelligent determinator for the setting time of the cement-based material; starting a test switch, measuring the temperature of cement-based material samples within equal time intervals, and storing measured data to a temperature data collector or sending the measured data to a computer in real time; processing data of a temperature-time corresponding relation curve of the cement-based material samples through the computer to acquire the start time and the finish time of the acceleration period of the hydration rate of the cement-based material. The measuring method facilitates measuring of the continuous hydration temperature rise when the cement-based material comes out of the stirring machine at a construction site to obtain the accurate start time and finish time of the acceleration period of the hydration rate, so as to mark the initial setting time and the final setting time for better serving the on-site construction.

Description

technical field [0001] The invention relates to an intelligent determination method for setting time of cement-based materials. technical background [0002] Hydration is the most fundamental and important feature of cement-based materials, and setting hardening is the external manifestation of hydration to a certain stage. As we all know, the setting time of concrete in construction is very important for determining the starting time of curing, determining the time of form removal, and controlling the hydration temperature. At present, with the expansion of projects to high-rise, long-span, and underground spaces, pumping concrete is gradually popularized, and the phenomenon of cracking of concrete structures is also becoming more and more common (such as figure 2 shown). Due to the limitation of urban traffic conditions, if the time during the transportation of pumping cement-based materials is too long, exceeding the initial setting time of concrete, it will lead to dif...

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Problems solved by technology

[0004] This measurement method has the following limitations: (1) It is only applicable to the laboratory and cannot be used on the construction site; (2) The penetration resistance of the sieved mortar is used to evaluate the setting time of the concrete on site, and the test results of the mortar are consistent with the concrete (3) Inconvenient operation: For high-viscosity concrete, such as pumped commercial concrete and self-compacting concrete with a large amount of cementitious materials, it is difficult to screen out enough mortar, so the operation is inconvenient or even impossible; (4) Since the penetration resistance has a great relationship with the water-binder ratio and is affected by the degree of concrete segregation, sometimes it may even lead to misjudgment

For cement-based materials that can finally obtain specific strength through hydration, the water-binder ratio satisfies the premise that the particles can be cross-linked into a structure after hydration, although the water-binder ratio (the distance between hydrate particles) is To a certain extent, it affects the cross-linking time between hydration particles, but due to the rapid development of the hydration acceleration period, this effect is largely weakened

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