The Experts below are selected from a list of 33876 Experts worldwide ranked by ideXlab platform
Xiaodong Shen - One of the best experts on this subject based on the ideXlab platform.
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Influence of sodium Gluconate on the performance and hydration of Portland cement
Construction and Building Materials, 2015Co-Authors: Shenbiao Zhang, Xiaodong ShenAbstract:Abstract Sodium Gluconate is commonly used to delay the setting of cement and concrete. This study investigated the effects of sodium Gluconate on the physical properties and structure of Portland cement. Sodium Gluconate improved the compressive strength at 3 and 28 days, delayed cement setting and increased the fluidity of the Portland cement mortar. Less than 0.03% sodium Gluconate promoted the formation of ettringite (AFt) at early age. A dosage of 1.0% sodium Gluconate significantly inhibited the reaction between C3A and CaSO4·2H2O. Sodium Gluconate delayed the hydration reaction of C3S, which increased the duration of the induction period. Sodium Gluconate had only a slight effect on the hydration reaction of the ferrite phase. The pore distribution and porosity of the cement paste were not improved due to the decrease in hydration.
Shenbiao Zhang - One of the best experts on this subject based on the ideXlab platform.
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Influence of sodium Gluconate on the performance and hydration of Portland cement
Construction and Building Materials, 2015Co-Authors: Shenbiao Zhang, Xiaodong ShenAbstract:Abstract Sodium Gluconate is commonly used to delay the setting of cement and concrete. This study investigated the effects of sodium Gluconate on the physical properties and structure of Portland cement. Sodium Gluconate improved the compressive strength at 3 and 28 days, delayed cement setting and increased the fluidity of the Portland cement mortar. Less than 0.03% sodium Gluconate promoted the formation of ettringite (AFt) at early age. A dosage of 1.0% sodium Gluconate significantly inhibited the reaction between C3A and CaSO4·2H2O. Sodium Gluconate delayed the hydration reaction of C3S, which increased the duration of the induction period. Sodium Gluconate had only a slight effect on the hydration reaction of the ferrite phase. The pore distribution and porosity of the cement paste were not improved due to the decrease in hydration.
Xiaowei Zhang - One of the best experts on this subject based on the ideXlab platform.
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effects of sodium Gluconate on early hydration and mortar performance of portland cement calcium aluminate cement anhydrite binder
Construction and Building Materials, 2017Co-Authors: Xiaowei Zhang, Yan He, Chunxia Lu, Zhou HuangAbstract:Abstract Effects of sodium Gluconate on early hydration of the Portland cement-calcium aluminate cement-anhydrite ( PC-CAC-C S ¯ ) ternary binder were investigated through isothermal calorimetric, X-ray diffraction analysis (XRD), differential scanning calorimeter analysis (DSC) and scanning electron microscope (SEM). Additionally, mortar performances of the ternary binders, including mechanical strength, fluidity as well as setting time were studied. The results show that sodium Gluconate firstly delays ettringite (AFt) formation slightly and then promotes the AFt formation once it begins to form. Sodium Gluconate postpones the hydration of silicate and reduces its hydration rate slightly. The hydration of silicate is delayed less in calcium aluminate cement (CAC) rich ternary binder at the same sodium Gluconate dosage. High dosage of sodium Gluconate will cause significant delay of silicate hydration in CAC poor ternary binder and lower hydration rate. Sodium Gluconate impedes CA hydration and inhibits the dissolution of gypsum synchronously, which may lead to the slight delay of AFt formation. Moreover, sodium Gluconate influences the growth orientation of AFt, which shows better defined as well as larger shape. Sodium Gluconate is not an ideal retarder for fluidity loss control in ternary binder, which increases initial mortar fluidity but cannot control fluidity loss.
L E Metzger - One of the best experts on this subject based on the ideXlab platform.
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effect of sodium Gluconate on the solubility of calcium lactate
Journal of Dairy Science, 2011Co-Authors: C Phadungath, L E MetzgerAbstract:Abstract Calcium and lactate are present in excess of their solubility in Cheddar cheese. Consequently, calcium lactate crystals (CLC) are a common defect in Cheddar cheese. A novel approach for preventing CLC is the addition of sodium Gluconate. Sodium Gluconate has the potential to increase the solubility of calcium and lactate by forming soluble complexes with calcium and lactate ions, and preventing them from being available for the formation of CLC. The objective of this study was to determine if sodium Gluconate could increase the solubility of calcium lactate (CaL 2 ). Seven CaL 2 solutions (5.31% wt/wt) with 7 levels of sodium Gluconate (0, 0.5, 1, 1.5, 2, 3, and 4% wt/wt) were made in triplicate. Solutions were stored at 7°C for 21 d, and were visually inspected for CLC formation. Subsequently, they were filtered to remove CLC and the supernatant was analyzed for lactic acid and gluconic acid by HPLC and for calcium by atomic absorption spectroscopy. The visual inspection demonstrated that CLC were formed in the solution with 0% Gluconate after the first day of storage and CLC continued to accumulate over time. A minute amount of CLC was also visible in the solution with 0.5% Gluconate after 21 d of storage, whereas CLC were not visible in the other solutions. The HPLC results indicated a higher concentration of calcium and lactic acid in the filtrate from the solutions containing added Gluconate. Thus, sodium Gluconate can increase the solubility of CaL 2 .
Zhou Huang - One of the best experts on this subject based on the ideXlab platform.
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effects of sodium Gluconate on early hydration and mortar performance of portland cement calcium aluminate cement anhydrite binder
Construction and Building Materials, 2017Co-Authors: Xiaowei Zhang, Yan He, Chunxia Lu, Zhou HuangAbstract:Abstract Effects of sodium Gluconate on early hydration of the Portland cement-calcium aluminate cement-anhydrite ( PC-CAC-C S ¯ ) ternary binder were investigated through isothermal calorimetric, X-ray diffraction analysis (XRD), differential scanning calorimeter analysis (DSC) and scanning electron microscope (SEM). Additionally, mortar performances of the ternary binders, including mechanical strength, fluidity as well as setting time were studied. The results show that sodium Gluconate firstly delays ettringite (AFt) formation slightly and then promotes the AFt formation once it begins to form. Sodium Gluconate postpones the hydration of silicate and reduces its hydration rate slightly. The hydration of silicate is delayed less in calcium aluminate cement (CAC) rich ternary binder at the same sodium Gluconate dosage. High dosage of sodium Gluconate will cause significant delay of silicate hydration in CAC poor ternary binder and lower hydration rate. Sodium Gluconate impedes CA hydration and inhibits the dissolution of gypsum synchronously, which may lead to the slight delay of AFt formation. Moreover, sodium Gluconate influences the growth orientation of AFt, which shows better defined as well as larger shape. Sodium Gluconate is not an ideal retarder for fluidity loss control in ternary binder, which increases initial mortar fluidity but cannot control fluidity loss.