scholarly journals Study on Strength and Microstructure of Cement Pastes Containing Limestone Powder under Flowing Acid Solution Condition

ISRN Ceramics ◽  
2012 ◽  
Vol 2012 ◽  
pp. 1-6
Author(s):  
Shuhua Liu ◽  
Lihua Li ◽  
Zhigang Wang ◽  
Jiafeng Wang ◽  
Meijuan Rao
Keyword(s):  
Acetic Acid ◽  
Sulfuric Acid ◽  
Calcium Carbonate ◽  
Acid Solution ◽  
Calcium Hydroxide ◽  
Ph Value ◽  
Acetic Acid Solution ◽  
Limestone Powder ◽  
Acid Attack ◽  
Cement Pastes

Different cement pastes containing limestone powder were prepared and soaked, respectively, in flowing acetic acid solution with pH value of 4 and sulfuric acid solution with pH value of 2. The strength and microstructure of the pastes after different flowing acid attack periods were investigated by using strength test, X-ray diffraction (XRD), and scanning electron microscopy (SEM) techniques in this study, which reveals the effect of limestone powder on flowing acid resistance mechanism of cement paste. Testing results show that the strength of pastes suffered flowing acid attack decreases with the increase of water-binder ratio and the content of limestone powder. In flowing acetic acid solution, calcium hydroxide and calcium carbonate react with acetic acid, which therefore made deterioration of pastes proceed from the exterior to the interior. In flowing sulfuric acid solution, although calcium hydroxide and calcium carbonate could react with sulfuric acid and form gypsum, the flowing liquid would dissolve it out and thus the crystallization of gypsum was difficult which would somewhat inhibit the swell of pastes.

Acid Attack on Cement Paste Containing Limestone Powder

2013 ◽  
Vol 724-725 ◽  
pp. 1589-1592
Author(s):  
Shu Hua Liu ◽  
Zhi Gang Wang ◽  
Ya Ning Kong ◽  
Li Hua Li ◽  
Mei Juan Rao
Keyword(s):  
Acetic Acid ◽  
Sulfuric Acid ◽  
Acid Solution ◽  
Cement Paste ◽  
Ph Value ◽  
Acid Resistance ◽  
Limestone Powder ◽  
X Ray Diffraction ◽  
Acid Attack ◽  
Acid Ph

A comparative study has been performed on the acid resistance of cement paste exposed to acetic acid (pH=4) and sulfuric acid (pH=2). The pastes are prepared by replacing 30% and 50% cement with limestone powder. Their properties and microstructures are investigated by using strength test, X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. The paper reveals that erosion extent of pastes depends mainly not only on the pH value of acid solution and the w/b ratio of pastes, but also on the limestone powder mixed that contributes partly to the hydration. Though gypsum and ettringite formations are dominant to the deterioration of pastes exposed to sulfuric acid solution, the degree of decrease for the compressive strength of specimens exposed to sulfuric acid is retarded compared with the specimens exposed to acetic acid. This is attributed to the product of gypsum, which delays the further erosion to the internal paste.

scholarly journals PENGARUH PERBEDAAN KONSENTRASI LARUTAN ASAM ASETAT (CH3COOH) TERHADAP KARAKTERISTIK GELATIN KULIT KAKI AYAM

ZOOTEC ◽  
2015 ◽  
Vol 35 (2) ◽  
pp. 23
Author(s):  
Indri M. Pantow ◽  
Meity Sompie ◽  
Arie Dp. Mirah ◽  
Linda Ch. M. Karisoh
Keyword(s):  
Acetic Acid ◽  
Acid Solution ◽  
Ph Value ◽  
Acetic Acid Solution ◽  
Solution Concentration ◽  
Gel Strength ◽  
National Standard ◽  
Randomized Design ◽  
Chicken Legs ◽  
The Difference

THE EFFECT OF ACETIC ACID CONCENTRATION ON CHARACTERISTICS OF CHICKEN LEG SKIN GELATIN. This research was aimed to determine the effect of differenceacetic acid (CH3COOH) concentration on chicken legs skin gelatin. The experiment were determined by analysis of Completely Randomized Design with one factors and five replicates of treatments.The factor was concentration of acetic acid solution consisting 4 level (1, 3, 5 and 7%).The results showed that the difference  concentration acetic acid solution had high significant effect (P<0.01) on the the  yields, viscosity, gel strength and pH value ofchicken legs skin gelatin.Yield of chicken legskin gelatin was13.57 to 15.49%, viscocity was ranged between  4.30 to 5.76,  gel strength was 61.15 to 68.29 g Bloom and pH value was 5.24 to 5.58. The conclusion of this research was the chicken leg skin gelatin using acetic acid solution concentration 1 % to 7 % had the similar characteristics with the commercial gelatin and includedyields, viscosity, gel strength and pH value of Indonesian National Standard gelatin.   Key words : Acetic acid,  Gelatin and  Chicken legs skin

Research on Preparation of Barium Titanate Nano Powder by Sol-Gel

2014 ◽  
Vol 809-810 ◽  
pp. 136-139
Author(s):  
Xiao Chi Li ◽  
Qiao Yang
Keyword(s):  
Acetic Acid ◽  
Barium Titanate ◽  
Acid Solution ◽  
Ph Value ◽  
Sol Gel ◽  
Acetic Acid Solution ◽  
Gel Time ◽  
Nano Powder ◽  
Heat Preservation ◽  
Hydrolysis Of

The barium titanate nanopowder was widely applied to many fields because of its excellent performances. The homogeneous barium titanate nanosized powder with high purity and small size was achieved by sol-gel. Effects of different amount of the hydrolysis of acetic acid solution on gelation process and particle size of the powder, PH value on gel time and heat preservation temperature on gelatinization were studied in the paper. The amount of the hydrolysis of 36% acetic acid solution was 25ml and the amount of Glacial acetic acid used for PH adjustment was 25-30ml. The heat preservation temperature was 95-100 °C.

Some Approaches to Viscometric Study of Chitosan in Acetic Acid Solution

2016 ◽  
Vol 10 (2) ◽  
pp. 135-139 ◽  
Author(s):  
Valentina Chernova ◽  
◽  
Angela Shurshina ◽  
Elena Kulish ◽  
Gennady Zaikov ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Acid Solution ◽  
Intrinsic Viscosity ◽  
Acetic Acid Solution ◽  
Conformational State ◽  
Macromolecular Coil ◽  
Degree Of Swelling ◽  
Current Value ◽  
Viscometric Study

Some ways of estimating the values of the intrinsic viscosity of chitosan were analyzed. It was shown that the method of Irzhak and Baranov for estimating the current value of the intrinsic viscosity allows to adequately estimates the conformational state of the macromolecular coil and its degree of swelling.

Durability of Red Mud Based Geopolymer Paste in Acid Solutions

2016 ◽  
Vol 866 ◽  
pp. 99-105 ◽  
Author(s):  
Smita Singh ◽  
M.U. Aswath ◽  
R.V. Ranganath
Keyword(s):  
Mechanical Properties ◽  
Acetic Acid ◽  
Fly Ash ◽  
Red Mud ◽  
Acetic Acid Solution ◽  
Strength Loss ◽  
Acid Solutions ◽  
Test Results ◽  
Acid Attack ◽  
Geopolymer Paste

The present investigation is on the effect of red mud on the mechanical properties and durability of the geopolymer paste in sulphuric and acetic acid solution. Red mud and fly ash were used to form the geopolymer paste along with the alkalies. The variation of red mud in the paste composition was from 0% to 90%. Cylindrical shaped specimens of 1 inch diameter and 1 inch height were prepared. The specimens were immersed in 5% sulphuric acid and 5% acetic acid for 1, 7, 14, 28, 56 and 84 days and tested for weight loss, visual deformation, strength loss and colour of the solvent, based on the procedure specified by ASTM C 267 – 01. SEM/EDX Tests were performed on the geopolymer specimens. Test results show that initially, the strength of the geopolymer increased upon the addition of red mud. The strength was maximum when the percentage of red mud was 30%. The maximum strength obtained was 38 MPa for the paste containing 30% red mud using 10M alkali solution as against 31.69 MPa, when only fly ash was used. Geopolymer paste containing 30% and 50% red mud showed better resistance to acid attack. The strength loss was minimum for the samples containing 30% red mud in both inorganic and organic acid i.e. sulphuric and acetic acid.

Compatibility studies of chitosan/PVA blend in 2% aqueous acetic acid solution at 30°C

2010 ◽  
Vol 82 (2) ◽  
pp. 251-255 ◽  
Author(s):  
H.M.P. Naveen Kumar ◽  
M.N. Prabhakar ◽  
C. Venkata Prasad ◽  
K. Madhusudhan Rao ◽  
T.V. Ashok Kumar Reddy ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Acid Solution ◽  
Acetic Acid Solution ◽  
Aqueous Acetic Acid ◽  
Compatibility Studies ◽  
Aqueous Acetic Acid Solution
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