Model # 04010055

Internet #202188453

Store SKU #383759

Rapid Set 55 lb. Mortar Mix

Rapid Set

55 lb. Mortar Mix

  • Sets in just 15 minutes
  • Structural Strength in just 1 hour
  • Easy to use, just add water
Was  $16.55
$15.47 / each
If you buy 25 or more
$12.38 / each
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Frequently Bought Together

Product Overview

Rapid Set Mortar Mix is a high quality mortar that is suitable for vertical and overhead applications. It is ideal when rapid strength gain, high durability, and low shrinkage are desired. Use Mortar Mix for general and structural concrete repair, stucco and plaster repair, one-coat exterior plaster, mortar beds, underlayment, and formed work. Mortar Mix sets in 15 minutes and is ready to drive or build on in one hour. Durable in wet environments, it can be applied from 1\2 in. to 6 in. thick. Mortar Mix is a blend of high performance Rapid Set cement with quality sand. Mortar Mix offers superior resistance to chemical attack. It is non-metallic and no chlorides are added. Mortar Mix allows the repair areas to be painted, coated, or sealed quickly after application. Under dry conditions, water-based coatings such as latex paint can be applied after the product is hardened, which usually takes one to four hours. Solvent-based and impermeable coatings such as oil based paint and epoxy can be applied in 16 hours.

California residents: see   Proposition 65 information

  • Fast setting - hardens to structural strength in 1 hour
  • Ultra durable - over 6,500 psi ultimate strength
  • Crack resistant, long-life formula
  • Bonds to concrete, brick, stone and many other surfaces
  • High performance, eco-friendly hydraulic cement formulation
  • Easy to use - just add water
  • Meets ASTM C928 requirements
  • One 55 lb. bag yields 0.5 cu. ft.
  • Learn more about concrete and cement here in our Buying Guide

Info & Guides

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Coverage Area (cu. ft.)
Product Depth (in.)
Product Height (in.)
Product Length (in.)


Color Family
Compression strength (psi)
Crack Resistant,Fast Setting,Paintable,Pre-Mixed,Sealable,Stainable
Mix Type
Fast Setting,High-Strength
Overhead Use
Product Weight (lb.)
Use Location
Working time (min.)

Warranty / Certifications

Manufacturer Warranty
1 Year Limited Warranty

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Customer Questions & Answers

"Craft" use -- making animal tracks

Working with Cub Scouts. I have a set of animal track stamps (used to make impressions so the kids can make plaster castings of "real" tracks). The weather hasn't cooperated and the ground is dry & hard. My thought was to scrape off some of the native dirt, mix it with mortar mix to make something like dirt-crete, then use the stamps to press into this mixture. The track-prints don't have to last forever -- I just want there to BE tracks for the kids to find on a "discovery" hike this coming weekend. Suggestions, and would this product work for that?
Asked by: Maggie
Some one said it might break before an higher psi material I think he misspoke as this is the higher psi material in relation to other mortar mixes. So it should do fine for molding purposes.
Answered by: BILL
Date published: 2017-07-11

Cant this be used to patch holes vertically on steps ? Feather edge to 5 inch holes?

Asked by: Johnny
Sure this would work fine for that use. 5 inches is within its advertised size limits, and it does setup quickly, so you could use a temp type form to hold it for just 20-30 minutes. Then it should hold itself.
Answered by: msd
Date published: 2016-12-12

Is the best stuff to use on a stone foundation that needs refinished and to help reseal to stop leaks in basement walls

Asked by: Redohio
I would not recommend it. I would use the Quikrete water stop cement. I have used it on two block foundations and had excellent results both times.
Answered by: Rinny
Date published: 2017-07-10

Can this be used with Rapid Set Flow Control?

I need to apply this with a mortar bag - can I add your Flow Control product to get it to extrude more easily from the tip of the bag? If so, what are the recommended proportions?
Asked by: Steve
Yes. Rapid Set Flow Control is a pouch additive that can be used with this 55LB mortar mix. It allows for 20-30 minutes more work time. I think the company rep said there might be a maximum of 3 to 4 pouches that can be used on each 55lb bag. I usually only need 1 pouch per bag in regards to my project remodels.
Answered by: AcePeters
Date published: 2016-06-10
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Customer Reviews

55 lb. Mortar Mix is rated 3.9 out of 5 by 53.
Rated 5 out of 5 by from Amazing Stuff I bought 1 bag and tried it out today. We are fixing an old concrete basement. After reading the reviews I decided to only mix up small amounts at a time. This worked perfectly. I mixed up about 4 trowel fulls with some water until I got the correct consistency. (I watched a few videos so I understood what I was looking for). I applied it, then mixed up some more. Once I was ready to put on the next batch the first batch had partly set up. It was very easy to work with and I did not find that it set up too fast. Just make sure you don't mix up too much at a time and you'll be fine. I am going to go buy a few more bags to complete the project.
Date published: 2017-07-04
Rated 5 out of 5 by from An EXCELLENT Fast Setting Product, BUT, You Can Slow it Down. This is worth Reading, TRUST ME!!!!... An EXCELLENT Fast Setting Product, BUT, You Can Slow it Down. This is worth Reading, TRUST ME!!!!! The following is basic info you need to know if you are not familiar with how fast Rapid Set Products can set. If you are using this on a warm or hot day, there are a few key points to know BEFORE you get started. 1: If it is Warm or Hot outside, keep the bags of Mortar Mix in the shade or better yet, inside an AC conditioned space. If the dry Mortar Mix is above 75 degrees than you are already asking for a short set time. The cooler you can get the mix (No, do not go to the point of freezing temps) the more time it will take for it to achieve it strength (set). 2: Do not use warm water out of a hose!! Either let it run so it turns cool, or better yet, use Ice Water (with the ice cubes melted 100%). 3: Do not use a wheelbarrow that has been sitting in the sun for hours. Do NOT use a Concrete Mixer! I highly recommend using a 5 gallon Home Depot Bucket and a paddle mixer. If this is your first time using the product, DON'T mix the entire bag, start with 1/4 of it to ensure you get the time you need. 4: If you followed the above, you can also add Rapid Set Set Control packets to the mix which will increase your set time. However, if you don't do the above before adding Set Control, you will not gain as much time as you think. Do you see a theme here? The temperature of EVERYTHING will have a dramatic effect on the set time. One of the reviews stated even with the Set Control product added, it only gave him a couple of minutes. That was probably true, BUT when you don't properly prepare / ensure everything is at "cool-temperature", there is only so much one little packet can do. 5: The addition of the Concrete Pharmacy Flow Control product basically makes the Mortar FLOW. It is really amazing how you can add a a few sprinkles or more of the little pack (which looks like sugar but is not) to your bucket, turn on your paddle mixer, and 30-45 seconds later the mortar is much more fluid. Using Flow Control has another benefit, you will use less water. Excess water weakens the final PSI of cement based products, so using the minimum water needed will insure you achieve the maximum PSI / strength of the product. Rapid Set makes some incredible products and this is no different. As with most things, understanding a few key details makes all the difference in the world. Cheers!
Date published: 2016-12-12
Rated 4 out of 5 by from Crazy I used this mix as my first mortar slab for my shower. All I can say is wow, this stuff will make you sweat, it sets up so fast and so hard you barley have time to float it out. I almost lost it so make sure your ready or you'll loose your poor.
Date published: 2017-02-27
Rated 5 out of 5 by from I purchased this based on the recommendation from a Home Depot employee. I cast small projects t... I purchased this based on the recommendation from a Home Depot employee. I cast small projects that measure in inches, not feet. I wanted something that was faster than concrete, but still retained that appearance. I use a lot of molds in both silicon and melamine. In short, this fits the bill perfectly. It is easy to use, sets beautifully and is easy to clean up. It does set remarkably fast. I would highly recommend this product.
Date published: 2017-05-10
Rated 1 out of 5 by from If you need a product that sets up almost immediately, then this is your product. However, if yo... If you need a product that sets up almost immediately, then this is your product. However, if you need a little working time, you do not want to use this. I mixed up two bags per directions and wound up wasting most of it when it dried in the wheelbarrow before I hardly got started. Luckily, I was able to save the wheelbarrow. Took 23/25 bags back to the store.
Date published: 2017-04-11
Rated 5 out of 5 by from needed a c of o, could not wait or spend. Inspector came out and said I needed to replace the threshold below my door. Without adding any additional costs to the job I went to the Home Depot and bought this product. After reading the reviews all of the people are right, you have to use cold water. If you mix it all and leave it will get rock solid in an hour.
Date published: 2017-03-10
Rated 4 out of 5 by from Work with small batches at a time This product is fantastic for vertical applications and doesn't need any forms. My only problem with it, which can be a gift and at the same time a curse, is the speed at which it sets. Essentially within 10 minutes it becomes unworkable so you either need to work with small batches or be extremely fast. To that point, even the fastest will find themselves tested when attempting applications of a few square feet or more. Final note, help water cure with a spray bottle for the first hour, as suggested by the manufacturer - and, the use of a waterlogged sponge is extremely useful for smoothing out and levelling work which buys you some time at the back end of the job to about 15 minutes of workable time.
Date published: 2013-06-29
Rated 3 out of 5 by from The mortar dried out and started to crumble after it set for a few days. Followed mixing instruct... The mortar dried out and started to crumble after it set for a few days. Followed mixing instructions.
Date published: 2017-07-18
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