Effects of the Characteristics of High Range Water Reducing Agents and the Water to Powder Ratio on Rheological and Setting Behavior of Self-Consolidating Concrete

2014 ◽  
Vol 3 (2) ◽  
pp. 20130094
Author(s):  
Wolfram Schmidt ◽  
H. J. H. Brouwers ◽  
Hans-Carsten Kuehne ◽  
Birgit Meng
Keyword(s):  
Reducing Agents ◽  
Self Consolidating Concrete ◽  
High Range

scholarly journals Research of Polyocarboxy Acid Water-Reducer with Modified Ployether and its Effect on Concrete’s Workability

2011 ◽  
Vol 250-253 ◽  
pp. 2032-2035 ◽  
Author(s):  
Lu Feng Pang ◽  
Xin Xin Zhou
Keyword(s):  
High Performance ◽  
High Performance Liquid Chroma ◽  
Reducing Agents ◽  
Acid Water ◽  
Concrete Mixture ◽  
Synthetic Temperature ◽  
Naphthalene Series ◽  
High Range

In this paper, polycarboxylic type high performance water reducers have been synthesized through using TPEG modified monomer. If synthetic temperature and addition time of copolymer monomers can be controlled, the performance of polycarboxylic superplasticizer will be improved. Testing results indicates that when temperature is at 60~65°C, addition time of copolymer monomers is three hours, the performance of superplasticizer is best. Through High Performance Liquid Chroma- tography (HPLC) testing, we can find it is almost the same with the famous brand abroad of the same type. The ues of polycarboxylic type high performance water reducers cooperated with naphthalene series high range water reducing agents thereby markedly improv the workability of concrete mixture.

scholarly journals Rheological Method for Alpha Test Evaluation of Developing Superplasticizers’ Performance: Channel Flow Test

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Jae Hong Kim ◽  
Jin Hyun Lee ◽  
Tae Yong Shin ◽  
Jin Young Yoon
Keyword(s):  
Channel Flow ◽  
Test Method ◽  
Test Evaluation ◽  
Test Results ◽  
Self Consolidating Concrete ◽  
Mix Proportion ◽  
Flow Test ◽  
Rheological Method ◽  
New Type ◽  
High Range

Advance in high-range water-reducing admixture revolutionizes the workability and constructability of conventional vibrated concrete as well as self-consolidating concrete. Its need from construction fields has increased, and consequently a variety of new-type polycarboxylates, base polymers for the admixture, are being formulated in these days. Synthesizing new polymers needs a quick, but reliable, test to evaluate its performance on concrete. The test is also asked for selecting the best applicable brand of them before a test concrete will be mixed. This paper proposes a “channel flow test” and its usage for the purpose. The proposed procedure for the test includes the mix proportion of a test mortar, the test method, and rheological interpretation of the test results.

Flowing ability of self-consolidating concrete and its binder paste and mortar components incorporating rice husk ash

2010 ◽  
Vol 37 (3) ◽  
pp. 401-412 ◽  
Author(s):  
Md. Safiuddin ◽  
J. S. West ◽  
K. A. Soudki
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Flow Time ◽  
Test Results ◽  
Self Consolidating Concrete ◽  
Concrete Mixtures ◽  
Slump Flow ◽  
High Range

This paper presents the flowing abilities of various self-consolidating concretes (SCCs) and their binder paste and mortar components. The binder pastes and mortars were formulated from the concrete mixtures and tested for flowing ability with respect to flow time and flow spread, respectively, at various dosages of high-range water reducing admixture (HRWRA). The concrete mixtures were prepared with different water (W) to binder (B) ratios and rice husk ash (RHA) contents. The flowing ability of the concretes was measured with regard to slump flow, orimet flow time and flow spread, and inverted slump cone flow time and flow spread. The test results reveal that the W:B ratio, RHA content, and HRWRA dosage significantly influenced the flowing abilities of the binder pastes, mortars, and concretes. In addition, the flowing ability of the SCCs was well correlated with the flowing abilities of their binder paste and mortar components, except for the mortars including RHA.

Effect of High-Range Water-Reducing Admixture Chain Lengths on Self-Consolidating Concrete

2022 ◽  
Author(s):  
Süleyman Özen ◽  
Muhammet Gökhan Altun ◽  
Ali Mardani-Aghabaglou ◽  
Kambiz Ramyar
Keyword(s):  
Self Consolidating Concrete ◽  
Chain Lengths ◽  
High Range

Methods for the Concentration of Bovine Ac-Globulin (Factor V)

1961 ◽  
Vol 06 (03) ◽  
pp. 435-444 ◽  
Author(s):  
Ricardo H. Landaburu ◽  
Walter H. Seegers
Keyword(s):  
Room Temperature ◽  
Barium Carbonate ◽  
Deae Cellulose ◽  
Reducing Agents ◽  
Factor V ◽  
Isoelectric Precipitation ◽  
Stabilizing Agent ◽  
Bovine Plasma ◽  
The Stability

SummaryAn attempt was made to obtain Ac-globulin from bovine plasma. The concentrates contain mostly protein, and phosphorus is also present. The stability characteristics vary from one preparation to another, but in general there was no loss before 1 month in a deep freeze or before 1 week in an icebox, or before 5 hours at room temperature. Reducing agents destroy the activity rapidly. S-acetylmercaptosuccinic anhydride is an effective stabilizing agent. Greatest stability was at pH 6.0.In the purification bovine plasma is adsorbed with barium carbonate and diluted 6-fold with water. Protein is removed at pH 6.0 and the Ac-globulin is precipitated at pH 5.0. Rivanol and alcohol fractionation is followed by chromatography on Amberlite IRC-50 or DEAE-cellulose. The final product is obtained by isoelectric precipitation.

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