Therefore, for more than 8 inch thick pavements, ACI tables 5-6 and 5-7 should be used.įor more detailed information on Roller Compacted Concrete structural design, please check out Guide for Roller-Compacted Concrete Pavements, Section 5: Structural Design of Roller Compacted Concrete Pavements (National Concrete Pavement Technology Center, 2010) or Structural Design of Roller-Compacted Concrete for Industrial Pavements (Portland Cement Association, 1987). or more, StreetPave will automatically require dowels. The user should be aware that for a pavement thickness of 8 in. When using StreetPave, the option for undoweled joints should be selected. To achieve the same result using both programs, it is not uncommon to increase the reliability by 5 percent when using the StreetPave program to provide additional conservatism. The RCC-PAVE program uses a more conservative fatigue curve.
The StreetPave design program uses the conventional concrete fatigue curve.
#Winpas pavement design software cracked
Probably the most significant exception is the use of a variable fatigue curve, based on the desired reliability and the allowable percentage of cracked slabs. The calculation in StreetPave follows the PCA procedure with a few exceptions. The StreetPave design program allows the engineer to design conventional concrete and Roller Compacted Concrete pavements.
#Winpas pavement design software manual
Similar to the manual procedure, the software was developed mainly for heavy-duty pavement applications. Users can select interior or edge loading and have the options of standard vehicle loading or user-defined loading. It can be used to design a new pavement or analyze an existing pavement. RCC-PAVE program is based on PCA’s manual procedure. For this reason, when designing Roller Compacted Concrete pavements using conventional pavement design software, such as WinPAS or StreetPave, it is recommended that the default reliability level be increased by 5 percent to achieve results comparable to those of traditional Roller Compacted Concrete pavement design software such as RCC-PAVE. Users of these computer programs should be aware that the fatigue curve traditionally used in Roller Compacted Concrete pavement design is more conservative than the fatigue curve traditionally used in conventional concrete pavement design. Some engineers use WinPAS computer program as a check on the StreetPave program or ACI tables. For pavements carrying mixed-vehicle traffic, design tools suitable for undoweled conventional concrete pavements-such as the ACI tables or American Concrete Pavement Association’s StreetPave computer program-can generally be used with satisfactory results. This is the approach used by the PCA procedure and the USACE procedure. For heavy-duty industrial pavements, which carry heavy industrial vehicles such as loaders or container haulers, the design may be based on the expected number of load repetitions of the single heaviest vehicle, and other vehicles that are significantly lighter can be ignored. The pavement thickness is a factor of the subgrade support, the Roller Compacted Concrete flexural strength and the anticipated vehicle loading.įor structural design purposes, Roller Compacted Concrete pavements fall into two main categories-heavy-duty industrial pavements and pavements carrying mixed-vehicle traffic. Therefore, the same design methodology used for conventional concrete can be applied to Roller Compacted Concrete pavements. Research has shown that Roller Compacted Concrete exhibits fatigue behavior very similar to that of conventional concrete. Since the critical stresses in Roller Compacted Concrete are flexural, fatigue due to flexural stress in used for thickness design. In Roller Compacted Concrete structural design, the pavement thickness is increased or the strength of the concrete is increased until the stress ratio is reduced sufficiently to provide for adequate fatigue performance. The tensile stress at the bottom of the concrete slab is affected by the applied load, tire pressure and spacing, concrete thickness and stiffness, and the characteristics of the supporting materials. In the structural design, the pavement thickness is a function of the expected loads, concrete strength, and characteristics of supporting base and subgrade.
The strategy requires keeping the pavement’s flexural stress and fatigue damage caused by wheel loads within allowable limits. Thickness design for Roller Compacted Concrete pavements employs the same basic strategy as for conventional concrete pavements.