Strength and Stiffness of Cementitiously Stabilized Materials

 

For cementitiously stabilized materials (CSM), the fatigue and crushing damage models both require strength as input. The 28-day strengths and stiffnesses for the CSMs are listed in the following table. The unconfined compressive strength (UCS) is the main input, from which both the initial (28-day) stiffness and MOR are estimated. The equations for estimating stiffness from UCS depend on the material type, while the following equation (Wen et al, 2013) is used to estimate MOR from UCS for all materials (

 

 

Material Type

28-day UCS (psi/MPa)

28-day MOR (psi/MPa)

28-day Stiffness (ksi/MPa)

Notes

LCB

700/4.83

106/0.73

1,508/10,398

1.33*(7-day UCS at 530 psi) per Cantrans Standard Specification

LCBRS (Rapid set LCB)

Same as LCB

CTB-Class A

Same as LCB

CTB-Class B

User input, default 400/2.76

Estimated from 28-day UCS, default 79/0.55

Estimated from 28-day UCS, default 1,140/7,860

Stiffness converted from UCS using the same equation as LCB

LSS

User input, default 300/2.07

Estimated from 28-day UCS, default 66/0.45

Estimated from 28-day UCS, default 47/326

CSS

User input, default 300/2.07

Estimated from 28-day UCS, default 66/0.45

Estimated from 28-day UCS, default 360/2,484