The Experts below are selected from a list of 123 Experts worldwide ranked by ideXlab platform

Alexander Apelblat - One of the best experts on this subject based on the ideXlab platform.

Jean Ducasselapeyrusse - One of the best experts on this subject based on the ideXlab platform.

  • effect of Calcium Gluconate Calcium lactate and urea on the kinetics of self healing in mortars
    Construction and Building Materials, 2017
    Co-Authors: Jean Ducasselapeyrusse, R Gagne, Christine Lors, Denis Damidot
    Abstract:

    Abstract Bacteria-based healing of cracks remaining in self-healed concrete is under development to improve durability by allowing the healing of large cracks. The objective of this research was to assess the effect of several chemical compounds (called precursors) in particular Calcium Gluconate, Calcium lactate and urea, that could first, enhance the intensity of self-healing and second, serve as nutrients at later ages for either autogenous bacteria or bacteria subsequently added by spraying the concrete surface with a bacterial suspension. Selected solutions containing precursors were used to saturate single cracks of known geometry in mortar specimens. Airflow measurements were used to monitor the healing process and to compare the kinetics of the self-healing between precursor-saturated cracks and non-precursor-saturated cracks. The 24 h immersion of fresh cracks in mortars in Calcium lactate or Calcium Gluconate solutions increased the self-healing kinetics for large cracks. This could increase the availability of Calcium ions and carbonate ions, which are the main reagents for the formation of healing products. The higher initial availability of these reagents is confirmed by the rapid decrease of the apparent opening during the first month. The internal crack surfaces were covered with a thick, compact layer of healing products, mainly composed of calcite and ettringite.

Leif H Skibsted - One of the best experts on this subject based on the ideXlab platform.

  • increasing Calcium solubility from whey mineral residues by combining Gluconate and δ gluconolactone
    International Dairy Journal, 2019
    Co-Authors: Andressa De Zawadzki, Leif H Skibsted
    Abstract:

    Abstract Insoluble milk mineral residues from whey processing, dominated by hydroxyapatite and Calcium hydrogen phosphate, dissolved isothermally in aqueous Gluconate/δ-gluconolactone, spontaneously forming solutions supersaturated in both Calcium hydrogen phosphate and Calcium Gluconate. Calcium concentration of maximally supersaturated solutions was proportional to Gluconate concentration, indicating Gluconate assisted dissolution, while gluconolactone increased Calcium available for dissolution and supersaturation. Precipitation of Calcium Gluconate, rather than of Calcium hydrogen phosphate, was critical for supersaturation robustness. For Calcium Gluconate ionic product:solubility product of Calcium Gluconate ratios 100 times compared with equilibrium Calcium hydrogen phosphate solubility, may be exploited for increasing Calcium availability of whey mineral based functional foods.

Alexander Mishelevich - One of the best experts on this subject based on the ideXlab platform.

Denis Damidot - One of the best experts on this subject based on the ideXlab platform.

  • effect of Calcium Gluconate Calcium lactate and urea on the kinetics of self healing in mortars
    Construction and Building Materials, 2017
    Co-Authors: Jean Ducasselapeyrusse, R Gagne, Christine Lors, Denis Damidot
    Abstract:

    Abstract Bacteria-based healing of cracks remaining in self-healed concrete is under development to improve durability by allowing the healing of large cracks. The objective of this research was to assess the effect of several chemical compounds (called precursors) in particular Calcium Gluconate, Calcium lactate and urea, that could first, enhance the intensity of self-healing and second, serve as nutrients at later ages for either autogenous bacteria or bacteria subsequently added by spraying the concrete surface with a bacterial suspension. Selected solutions containing precursors were used to saturate single cracks of known geometry in mortar specimens. Airflow measurements were used to monitor the healing process and to compare the kinetics of the self-healing between precursor-saturated cracks and non-precursor-saturated cracks. The 24 h immersion of fresh cracks in mortars in Calcium lactate or Calcium Gluconate solutions increased the self-healing kinetics for large cracks. This could increase the availability of Calcium ions and carbonate ions, which are the main reagents for the formation of healing products. The higher initial availability of these reagents is confirmed by the rapid decrease of the apparent opening during the first month. The internal crack surfaces were covered with a thick, compact layer of healing products, mainly composed of calcite and ettringite.