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We are supporting a project demanding strict quality. The client is proposing to use Non-shrink grout under base-plates and other structural components. We can not find an ASTM Standard that specifically addresses "Field" testing of the grout. We have referenced the following ASTMs: C 109 C...

We are supporting a project demanding strict quality. The client is proposing to use Non-shrink grout under base-plates and other structural components. We can not find an ASTM Standard that specifically addresses "Field" testing of the grout. We have referenced the following ASTMs: C 109 C...

We are testing post-installed anchors in concrete, utilizing a hollow-cylinder jack, pump and pressure gauge type assembly; similar to the configuration referenced in ASTM C 900 and/or ASTM D 4435. We have calibrated the pressure gauge and standardized the system in accordance with Annex A1...

A detail calls out for rebar to be welded; yet, welding rebar under harsh scrutiny for this project may not be a viable option? The location of the welded connection forms a "cross" and was wondering if there are any mechanical connectors made for that type of application?

Thank's for both your posts. What is that website address?

We are trying to determine the modulus of a soil subgrade underneath a concrete slab in an existing structure. We are cutting a 3' x 3' square hole in the slab to access subgrade. What would be the most cost-effective way to determine this?

Understandable - that's what my thoughts were on the matter; but, where is it reference in ACI?

Doesn't the absorbed water, in aggregate(s), effect the water/cement ratio? The below definition would indicate not, but couldn't the absorbed water play a part in the total water/cement ratio? As defined in ACI 2008: Water-cement ratio - the ratio of the mass of water, exclusive only of...

I'm tracking down more information on the dimensions and volume of the pour. I was looking for generalities regarding the pros of 3/8" aggregate in a batched mix as opposed to sack grout. I will post more information as it becomes available.

I think that's along the lines I've been researching... The alleviation of shrinkage seems to be the key component. Thks.

The grout will be used behind angle iron in a dam.

We have a requirement that the max. size aggregate in a grout mix be 3/8" and be batched from a ready-mix plant. What may be some benefits of have a 3/8" aggregate in a mix?

Thanks, Ron - Excellent information. Any particular epoxy (recommended manufacturer)?

I don't have the infomation as to when the control joints were cut. I appreciate everybody's input. If any recommendations on how to resolve/alleviate this problem could be suggested - also greatly appreciated.

Thanks bimr - excellent information. Please see attached picture. This is one of the most severe instances of the cracking along the control joint. http://files.engineering.com/getfile.aspx?folder=c1fd1eef-5aba-48fa-a0bf-fdcbed3dabd4&file=Crack_VII.JPG

Thanks bimr - excellent information. http://files.engineering.com/getfile.aspx?folder=d3b65cfd-8ac5-439c-bc57-8a40a2118b49&file=Crack_II.JPG

There was a new building constructed (less than 2 months old) and the reinforced concrete slab has considerable surface cracking near the control joints in some instances and nearly in the middle of others. There are no records of control testing during the construction of this bldg -...