The role of citric acid, a retarder

The role of citric acid, a retarder additive used to prolong the workability and setting time of gypsum
binders, was studied at concentrations of 0, 125, 250, 500, 1000, 1500 and 3000 ppm with a constant
water/binder ratio. The hydration process (setting) was studied by the knife method, conductivity measurements
and attenuated total reflectance infrared spectroscopy, which provided an estimation of the
time it took for calcium sulphate dihydrate to be formed. Scanning electron microscopy confirmed that
the gypsum microstructure varied when citric acid is used. The mechanical properties of the plaster were
also studied by ultrasonic measurements, shore-D hardness, flexure and compressive strength tests. It
was found that citric acid partially inhibits binder hydration from hemihydrate to dihydrate, as observed
by X-ray diffraction analysis.

ผลลัพธ์ (อังกฤษ) 2:

The Role of Citric acid, A retarder additive used to Prolong The workability and setting time of Gypsum.
Binders, was studied at concentrations of 0, 125, 250, 500, 1000, 1500 and 3000 PPM with A Constant.
Water / Binder ratio. The Process hydration (setting) was studied by The Knife Method, Measurements conductivity.
Infrared spectroscopy and attenuated total reflectance, which Provided an Estimation of The.
time it took for Calcium sulphate dihydrate to be formed. Scanning Electron Microscopy confirmed that
The Gypsum Citric acid is used when Varied microstructure. The Mechanical Properties of The plaster were.
also studied by Ultrasonic Measurements, Shore-D Hardness, Strength flexure and compressive tests. It
was Found that Citric acid inhibits Partially Binder hydration from hemihydrate to dihydrate, as Observed.
by X-ray diffraction Analysis.

ผลลัพธ์ (อังกฤษ) 3:

The role of, citric acid a retarder additive used to prolong the workability and setting time of gypsum
binders was studied, At concentrations of 0 125 250,,,,, 500 1000 1500 and 3000 ppm with a constant
water / binder ratio. The hydration process (setting) was studied by the, knife method conductivity measurements
and attenuated total reflectance, infrared spectroscopyWhich provided an estimation of the
time it took for calcium sulphate dihydrate to be formed. Scanning electron microscopy Confirmed that
the gypsum microstructure varied when citric acid is used. The mechanical properties of the plaster were
also Studied by ultrasonic, hardness measurements shore-D, and flexure compressive strength tests. It
Was found that citric acid partially inhibits binder hydration from hemihydrate, to dihydrate as observed
by X-ray diffraction Analysis