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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»»
Resurfacing Concrete
Posted by Brian from Suwanee, GA, US on July 24, 2007
I am looking at a product called EPoxy Toxy as a possible solution for resurfacing my concrete dirve. Have you ever worked with an epoxy compound like this and what were the results. Most resurfacing i have seen done with concrete based products crack and flake over time.
Does this look like a better solution? Here is the link to the web site.
http://www.lsepoxies.com/ConcreteRepair.html
The strength and bonding of epoxy based material to the substrate is better than cement based materials. Make sure that you do proper surface preparation by removing dust and loose particles before applying the product. Also, the cleaned surface should be free from moisture while application of the product.
Goodluck.
admixtures for plastering
Posted by kishore T.P from chennai, IN, IN on July 18, 2007
I am doing a renovation of an old building. The entire outter wall has dampness while rainy season. I hava planed to chipe off the outside plastering completly and redo the same. what method and admixture i have to adopt while redoing plastering works, so as to arrest the seepage and improve the strength of building. The building is of 15 years old and it is in chennai.
With regards
kishore .t.p
mail ID - naga_constructions@yahoo.com
Ph. 0 9841422109
A couple of points to remember:
1. Make sure you chip carefully and do not cause any damage to structure in the process. No making holes in the structure to support formwork for platforms.
2. Use a good mix design for the plaster, adequate cement, sieve the sand if it is coarse, use a mortar plasticizer or a liquid waterproofing admixture in the mortar, the most important thing is to have a control on the water to cement ratio.
3. Repair structural elements properly, where reinforcement is exposed,provide anti-corrosive coating on the reinforcement and use a bonding agent while patching the concrete.
4. While plastering make mortar in small batches. Workers generally have a tendency to make big batches and then add water when the mix gets drier. This will significantly reduce the water tighness of the structure. Quality control while plastering is the key.
5. If needed go for a double coat of plaster, do shotcrete if possible.
6. Do adequate curing after plastering.
7. Paint the finished building with a good waterproof paint.
8. Good materials, proper technique, workmanship and quality control are very important.
cast stone
Posted by Aggenbach from Cape town, OT, ZA on July 6, 2007
Hello BruceMy company is called Cemstone,we produce mainly wet cast cladding and paving products,cast into polyurethane moulds,vibrated and stacked to dry.We spray our releasing oil with a compressor onto the moulds,turning them face down to get rid of excess releasing oil,we oil every 3 days.We found that we get a lot of surface bubbles after oiling the moulds,these bubbles get less on the second and third cast.Are there problem directly linked to my releasing oil,,we have tried a couple ,all show the same results.My mix consists of Birla whitecement,a 6 mm stone ,coarse sand,calsium,oxide and water.Haveyou got any ideas how we con better this problem,even tried vibrating for longer periods
Regards Hennie Aggenbach
Hennie,
Since the bubbles get less on the 2nd and 3rd cast means either the mold reslease or its amount or application is one of the problems.
I had read in an article which said that mold release agents based on reactive agents generally perform better than barrier type mold release agents.
Try adjusting the mix design, especially the fines content and adjust the vibration time. Try spraying of the mold release using a finer size nozzle. It might be a trial and error process initially till you it right.
Goodluck.
concrete surface flaking
Posted by Lee from Maysville, KY, US on June 22, 2007
I have a problem with surface of my concrete driveway flaking off.
Eight months after concrete was poured, the top eighth inch is flaking off, in a lot of different places. There are a lot of spots you can see that are loose and will flak off.
Can you tell me what could have caused this problem, Also I would like to know if a topping of some kind can be used, If so what kind of
topping would be best, And how to prepare surface before appling a topping. My contractor tells me he is going to fix it, But he dose not seem to know just what to do.
THANKS FOR ANY ADVICE YOU CAN GIVE
Dear Lee,
Some one had asked a very similar question few months back. Please scroll back 2 pages on the link were questions are answered on this website and you can read the reply to that question. (http://expert.concreteproducts.com/admixtures/page/3/)
Apart from that answer such problems also occur sometimes due to alkali- aggregate reactions, if the aggregate used is reactive or if the pavement is damaged due to freeze thaw.
thanks
sealers
Posted by Dick from Everson, WA, US on June 4, 2007
Can I apply a lithium based sealer to colored and acid stained concrete? I am currently constructing 16″ x16″ x3′ columns for a decorated fence and I want to protect it from all weather conditions
Thank you
Dick Dykstra
Lithium based sealers are generally applied to structures affected from alkali-silica reaction. So far, I have not heard them being used for any other kind of protection.
Try to use mineral admixtures like flyash , slag or silica fume in your concrete mixes and try to maintain a low water to cementitious ratio for your concrete with the help of a high range water reducer. Cure the concrete well after construction. This will certainly improve the durability of your columns. For additional protection you can use a silane based colorless water repellent sealer.
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