Fritz-Pak NS-7 is a ready-to-use dry powdered admixture for portland cement grouts. NS-7 is formulated to produce a more uniform and workable non-shrink grout with less water, improved flowability, and extended set times. As a non-shrink additive, NS-7 will allow slow, controlled, in-place expansion prior to hardening. When used as a grout fluidifier, the product will greatly enhance flowability allowing ease of placement with extended handling and set times. It also significantly reduces water requirements, 10 to 20 percent, yielding increased compressive, and flexural strengths.
This product is recommended for all types of high-lift portland cement grouting applications where improved non-shrink performance with increased flowability is desired. It does not contain calcium chloride, nitrites, nitrates, or other potentially corrosive materials and is compatible with all standard grout additives.
How does NS-7 work and produce a nonshrink grout?
It contains an ingredient that generates gas and produces expansion. Expansion occurs before set in order to fill all voids and cavities.
Is the expansion desctructive?
No. Since the expansion is made by gas, it will not be strong enough to break any forms.
Is there any expansion after setting?
What type of gas is generated?
Are there any special guidelines for the application of non-shrink grouts made with NS-7?
Generation of gas starts within 5 minutes of adding water and will continue for approximately 1½ hours. The sooner the grout is placed, the greater the expansion it will give. The grout should not sit more than 1½ hours before it is used.
Does NS-7 work with calcium aluminate cements?
Yes. It is also effective with fast set cements
Does NS-7 contain a water reducer?
For grouts made with NS-7, do I follow standard concrete testing procedures?
No. Compressive strength needs to be tested using restrained cylinders or molds. If not done this way, compression strengths will be lower. See ASTM C 1107 for further reference.
Can I use NS-7 for block fill material?
What are the standards for NS-7?
NS-7 is used to produce non-shrink grouts. It is the grout produced that needs to conform to the specifications. With NS-7 you can produce grouts that conform to ASTM C 1107, Grade "A" Pre-Hardening Volume-Adjusting.
What are the best applications for NS-7?
NS-7 is used to prepare non-shrink grouts used in block filling, hollow core filling, ICF grouting, back filling in tunnels, back filling of pipes and in general for filling voids were low to moderate strengths are required.