A method for porosity calibration of cement mortar based on supercritical carbonization

Abstract

The invention provides a method for calibrating the porosity of a cement mortar based on supercritical carbonization. The method comprises the following steps: carrying out supercritical carbonizationtest and mercury injection test on a cement mortar test piece, inputting an average porosity result obtained by the mercury injection test to a supercritical carbonization numerical model, and carrying out supercritical carbonization numerical simulation under the following two porosity random field model parameters: different autocovariance lengths and porosity variation coefficients; comparingobtained supercritical carbonization test and numerical simulation results, and reversely calibrating two parameters in a porosity random field model; and inputting the autocovariance lengths and theporosity variation coefficients in the calibrated porosity random field model into the porosity random field model in the supercritical carbonization numerical model, carrying out supercritical carbonization test on different cement mortar test pieces, comparing obtained supercritical carbonization values with test results, and calibrating the average porosity of the different cement mortars.

Description

technical field [0001] The invention belongs to the multi-scale research field of cement mortar durability, and specifically relates to a method for calibrating the porosity of cement mortar based on supercritical carbonization. Background technique [0002] Cement mortar is widely used in civil engineering, water conservancy engineering and other fields. Cement mortar is a porous medium material. When evaluating the durability of buildings or structures using cement mortar, it is often necessary to obtain the average porosity of the material. The current use of buildings or structures is evaluated in order to provide guidance for their later detection, identification and reinforcement. At present, the average porosity of cement mortar is often measured by mercury intrusion experiment. However, the sample size of the average porosity of cement mortar that needs to be measured in engineering structure appraisal is often relatively large. There are some problems in the measure...

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Problems solved by technology

At present, the average porosity of cement mortar is often measured by mercury intrusion experiment. However, the sample size of the average porosity of cement mortar that needs to be measured in engineering structure appraisal is often relatively large. There are some problems in the measurement by mercury intrusion experiment: (1) If A large amount of test samples will result in relatively high costs; (2) Mercury porosimetry experiments have high requirements for sample production, and when the sample size is large, the pre-sample preparation time is longer; (3) Mercury porosimeters generally measure each time The sample is relatively small, and the experimental process takes a long time

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