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Definitions of concrete & chemical terms

Common Grout, Mortar, Cement, Sealant and Chemical Terms

Jaybro carries a huge range of grouts and mortars, sealants, adhesives and other chemicals and powders that can sometimes be quite technical to understand.

When comparing grouts for example, you might ask yourself what does shrinkage compensated actually mean? Or do I need HS or HES grout – what is best for my application?

We’ve put together a basic list of definitions for common terms used when talking about concrete, mortar, grout, pastes, expoxies and powders.

If you need assistance with any of the products in our range, please get in touch with our concrete chemicals expert, Anthony Rush.

Glossary of Common Terms

Cementitious usually a dry powder mixture based on a blend of Portland cement and / or aggregates.

Compressive Strength the capacity of the concrete or grout to withstand pushing or crushing loads.

Curing Compound Type refers to concrete curing chemicals which are categorised as Type 1, Type 1D, and Type 2.

  • Type 1 is a translucent fluid
  • Type 1 D is a translucent fluid with the addition of a special ‘fugitive’ dye which enables identification of areas that are not evenly covered
  • Type 2 is generally white pigmented. White compounds are able to reflect the sun thereby reducing heat absorption and drying of the concrete.

Curing Compound Class refers to concrete curing chemicals which are broken into A, B, D and Z.

  • Class A are typically wax based materials
  • Class B which hydrocarbon or resin based
  • Class D cures are synthetic polymers
  • Class Z encompasses all other types

Flexural Strength is the ability of a slab to resist failure in bending. It is measured by loading unreinforced concrete beams in a span configuration. The flexural strength can be defined as the stress in a material just before it yields in a flexure test. This measurement is often around 20% of the concrete’s overall compressive strength.

GP Grout General purpose. A good all round grout for everyday applications.

HB High Build grout. A mortar or grout that is able to be packed thicker than others. Can be applied in one thick application or built up in layers, depending on the product.

HES high early strength. A grout that reacts with water or a curing compound to achieve a good level of strength quickly, compared to other grouts. Useful when working in critical applications such as factory shutdown whilst machinery is being grouted.

HS High strength.

Low permeability protects against chloride attack.

Modulus of Elasticity Also known as Young’s Modulus or elastic modulus. A way to describe tensile elasticity, or the how much an object resists flexing when pulled apart or torn in different directions. It is defined as the ratio of tensile stress to tensile strain.

Shore A Hardness Shore A Hardness Scale measures the hardness of rubber based compounds that range in hardness from very soft and flexible, to medium and somewhat flexible, to hard with almost no flexibility at all. Semi-rigid plastics can also be measured on the high end of the Shore A Scale.  The Shore A scale is used for ‘softer’ rubbers while the Shore D scale is used for ‘harder’ ones.

SSD Saturated surface dry. A state where the concrete particles are saturated with water to a depth of several millimetres, but the surface is free of pooled water, as if it had been dried with a towel.

Shrinkage compensated is concrete or grout made with expansive components. It is designed to increase in volume after setting and during early hardening. This expansion is controlled by the reinforcement. The concrete causes the reo to be put under tension in the early hardening stages, and when the concrete eventually cures completely, the resulting shrinkage creates a controlled compressive stress instead of a tensile stress. This helps avoid cracking, corrosion, early deterioration or failure. Shrinkage compensated compounds are ideal for slabs and enable greater joint spacings.

VOC Volatile Organic Compounds.

Need advice? Our friendly team are available from 6am to help!

Give Jaybro a call on 1300 885 364 or use the instant SMS chat in the bottom right corner of this page.

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