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Bruce Strickland
National Marketing Manager
Sika Corporation
(800) 933–SIKA
Bruce has over 30 years experience in the admixture industry. In his career, he has held positions in product development, marketing, sales and sales management. Bruce has also spent time in...more»»
use of Sika admixtures for SCCin the precast concrete industry
Posted by Adrian Mircea from Cluj-Napoca, OT, RO on March 12, 2007
Hallo Bruce,
We are going to start an experimental program to introduce SCC in Romanian precast concrete industry.I saw information regarding the use of Sika-Visco Crete 5000and 6000, and recently 2100 in U.S.
Our colleague from Nederlands reccomended the use of Sika Visco Crete -20 Gold as admixture in combination with Sika Fume HR as Type II powder addition and these two could be supplied to our University by Sika Romania.
1)Could you send to me the technical prospects for these products?
2)What’s your opininion regarding the the proposed combination
( Sika Fume& Visco Crete -20 Gold )?Best regards,
Professor Adrian IOANI
Technical University of Cluj-Napoca(Romania)
Dear Professor Adrian,
“Sika Viscocrete” is the generic name of Sika’s high range water reducers based on polycarboxylate technology worldwide. However, admixtures in different countries have different names, as their formulations are adjusted for local cements and other materials.
Sika Viscocrete 20 Gold seems like a polycarboxylate admixture for the precast industry and Sika Fume HR a silica fume product. I do not have much information on these products as they are not supplied in United States.
I would recommend you to contact either the Technical services department or the Marketing department of Sika Romania. You can discus with them the objectives of your study and I am sure they would be in a better position to recommend the right product to you.
The weblink of Sika Romania and contact information is as below.
http://www.sika.ro/index.htm
http://www.sika.ro/contact.htm
Thanks
cement make
Posted by Tania from Bournemout, OT, GB on March 10, 2007
what type of cement is used for block paving production
Generally, Ordinary Portland cement (Type 1). They some times replace a part of cement using supplementary cementitious materials like Fly ash. Some cement companies still produce a type III cement. Also some companies produce a Type IB block cement. Both type III and Type IB are a finer grind and develop earlier compressive strengths.
Additives for grout
Posted by D from London, OT, GB on March 10, 2007
Hi Bruce
I have a question about the use of additives with grouts designed for deep grout curtains or consolidation grouting in dam foundations. The grout curtains are to reduce permeability under a dam and reduce water losses. Often at site the contractor orders significant quantities of additives for concrete and is therefore reluctant to order special addtives for grouts, claiming that they are anyway suitable. Which classes of additives are suitable for grouts? Typically a grout mix would be w/c 0.5 up to 1, with or without bentonite, occasionally with sand where high takes need to be stopped.
I have another question about the use of additives with bentonite slurry (typically 1-2% of cement). Are there any additives that are designed to work with bentonite?
Many thanks
To reduce permeability in concrete and grout mixes, addition of supplementary cementitious materials like Silica Fume and Fly ash should help. I would also recommend the use of a water reducer or a high range water reducer to reduce the amount of mix water and make the mixture more impermeable.
I don’t have much information on additives for bentonite. Try to do a search for that in “Google”.
Use of supplementary cementitious materials
Posted by Gretchen from Socorro, NM, US on March 8, 2007
Im interested in historical data for usage of pozzolans and other scms in concrete. What Im looking for is production or consumption data for concrete containing fly ash, ggbfs, natural pozzolans or silica fume (in the U.S.). Do you have any suggestions where I might find this information? Thank you for time.
Finding the consumption of the pozzolanic materials you mentioned above would be easy, but information on the consumption of concrete containing these materials is difficult.
There is an association for all SCM’s, you can try contacting them for this information. You can contact the “Slag cement association” (http://www.slagcement.org/), Silica Fume association” (http://www.silicafume.org/) and “American Coal Ash association” (http://www.acaa-usa.org/default.htm).
Also, approximately 75% of the concrete in United States is produced by Ready mix Concrete companies. You can contact the National Ready mix concrete association (NRMCA) and ask if they maintain such data.
Also, there are market research companies who do such kinds of research within the construction industry, you can approach such firms.
hight range water reducer.
Posted by Fafa from Tunis, OT, TN on March 7, 2007
How can we decide if a chemical ptoduct can be used as a hight range water reducer?
As the Sodium Tripolyphosphate is used to modify or to enhance the reological proprities of the clay; can we use it for cement pastes? And how can we study its effects on the concrete behavior ( at early age and hardening time)?
Any chemical admixture to qualify as a high range water reducer (HRWR) has to meet the requirements stated in ASTM C 494. The most widely used HRWR’s are based on Sulphonated naphthalene formaldehyde (SNF), Sulphonated melamine formaldehyde (SMF), Polycarboxylate admixtures (PC) and Modified Lignosulphonates.
The common fresh and hardened properties studied on concrete using admixtures are, slump (workability), slump retention, compressive strength, set time, air entrainment, freeze thaw, shrinkage etc.
I do not have any information on the use of Sodium Tripolyphosphate on cements.
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