Material: Concrete

The Material (properties) Concrete window is used for defining properties for concrete. Concrete steel fiber material properties are also accessed through the Material Concrete window.

When either the "Concrete" option or "Steel Fiber" option is chosen from the Criteria ribbon, the Material (properties) - Concrete window allows you to define concrete properties with or without steel fiber.

To define concrete material properties:

Go to Criteria>Material Properties and click on theConcrete icon. The Material dialog window will open with the Concrete tab active.
Click on the Add button to add a new concrete material to the list. Alternatively, use the Add Dramix ^®FRC button to add a Fiber material. Select a fiber material to activate the fiber options located on the right side of the Material Concrete window.

Tip: Steel fiber is indicated by an _F appended to the end of the name/label.
Modify the material properties as needed. Refer to the table below for information on the different inputs available.
Repeat steps 2 and 3until you add all the concrete materials you want to add to the model.
Click OK to accept the changes to the different materials and close the window.

As a new material is added, the program provides the default options, which can be modified as necessary. Different properties are defined based on the type of material defined and selected in the left-side pane, or the type you are adding. The table below indicates the difference.

Concrete Material Properties

Property

Description

Label

The name of the selected material. If adding new material, you need to provide a name that you can easily identify.

Note: Label names have a 12 character limitation. Special characters should be kept to dashes and underscores only, other special characters are not supported.

Help (button)

Opens the following pop-up window with some basic information about Wc, Ec and Wce.

Wc __

Indicates the Unit Weight of Concrete . Weight is used for self-weight calculation only.

Unit price __

Indicates the Unit Price per volume of concrete. Used in the quantity and cost calculation to calculate concrete cost.

Mechanical properties (28 days)

Indicates whether the selected material mechanical properties are based on Cylinder Strength or Cube Strength.

Cylinder Strength or Cube Strength also affect what options apply and can be modified under the Mechanical properties at stressing (initial; PT transfer) settings.

Cylinder Strength	When selected the program will use Cylinder Strength for the characteristics strength of concrete.
Cube Strength	When selected the program will use Cube Strength for the characteristics strength of concrete.
f'c	Concrete Cylinder Strength at 28 days.
f'cu	Concrete Cube Strength at 28 days.
Ec (Modulus of elasticity)	Input for the modulus of elasticity of concrete. Value is automatically calculated when you enter the characteristic strength of concrete. You can override the program calculated value by entering a value in place of the program calculated value.
Wce (Modulus of elasticity)	Weight of Concrete used to determine modulus of elasticity.
Default (Modulus of rupture)	When selected the program automatically calculates the modulus of rupture as 7.5√f'_c. If ACI-318-19 code is selected and f_y is ≥ 80,000 psi, the calculated deflection limits in section 8.3.2 shall be satisfied assuming a reduced modulus of rupture = 5 √f'_c.
fr (Modulus of rupture)	Input for a user defined modulus of rupture. When selected, the program will use the value selected by you instead of the program Default value for modulus of rupture (flexural tension cracking stress) for cracked deflection of reinforced concrete and post-tensioned slabs and beams.

Mechanical properties at stressing (initial; PT transfer)

Based on the option chosen under Mechanical properties (28 days), this defines either the cylinder strength or cube strength mechanical properties at stressing. Only one of the strengths is applied for the selected material.

f'ci	Input for the initial concrete cylinder strength at the time of stressing tendons.
f'cui	Input for the initial concrete cube strength at the time of stressing tendons.

Shear Modulus

Input for the Shear Modulus; otherwise modulus of rigidity.

Poisson's Ratio

Input for the value of concrete Poisson's ratio. For design of concrete structures, the most common value of concrete Poisson’s ratio is taken as 0.2.

Hagg

Input for the size of coarse aggregate in concrete. Passed to S-Concrete for column design, not used in ADAPT-Builder.

Thermal Expansion Coefficient

Input for the coefficient of thermal expansion. Used in evaluation of temperature loads.

The following properties apply only to fiber (Dramix^® FRC) materials

Design Type

Indicates the material's design type. There are two types available for Floor Pro (Elevated slab or Pile-supported slab) and two types available for Mat (Mat or Slab-on-ground).

Floor Pro

Floor Pro - Design Types

When 'Pile-supported slab' is selected as the design type, the Non-linear checkbox becomes available.

Mat

Mat - Design Types

When the Mat Design Type 'Slab-on-ground' is selected, the following options become available for editing:

Relative Humidity
Shrinkage Factor
Relaxation Factor
Friction Coefficient

Non-linear analysis

This checkbox is available only when design Type is set to Mat, Slab-on-ground, or Pile supported slab. If checked, the non-linear analysis method is used for calculation of reduction factors when you select a fiber material (Dramix^® FRC).

Fiber Material Type

The material's fiber type affects several of the other properties in this section. In addition the program mode (MAT/SOG or FLOOR PRO) will unlock further options.

Fiber Material Type	Indicates the type of fiber material used in the selected material. If adding a new material, it allows you to define the fiber material type.
Dosage Range	Dosage of fiber reinforcement within the concrete mix.
Size Factor: Ks	Allows you to choose whether to have the program automatically calculate the Size Factor, or if you want to define a specific Size Factor to be used.
Structural User Factor, Kc	This option is available only when Mat is chosen as the Design Type. It allows you to enter a specific Kc structural use factor to be used in the material.
Strength Reduction Factor, FRC	Allows you to enter specific Flexure and Shear factors to be used.
Relative Humidity	This option is available only when Slab-on-ground is chosen as the Design Type. It allows you to choose the relative humidity to be used for the material.
Shrinkage Factor	This option is available only when Slab-on-ground is chosen as the Design Type. It allows you to enter a specific shrinkage factor to be used for the material.
Relaxation Factor	This option is available only when Slab-on-ground is chosen as the Design Type. It allows you to enter a specific relaxation factor to be used for the material.
Friction Coefficient	This option is available only when Slab-on-ground is chosen as theDesign Type It allows you to enter a specific friction coefficient to be used for the material.

Residual __ psi

Only editable when theOverride Residuals checkbox is checked. It allows you to enter specific residual properties to be used for the material.

Override Residual

Allows you to override the default residual properties for the selected material. When checked, the Residual boxes become editable.