Experimental study on Portland cement pervious concrete mechanical and hydrological properties

Investigating properties of pervious concretes containing waste tire rubbers

Abrasion and freezing–thawing resistance of pervious concretes containing waste rubbers

Performance comparison of laboratory and field produced pervious concrete mixtures

Recent stormwater management regulations from the Environmental Protection Agency (EPA) and greater emphasis on sustainable development has increased interest in pervious pavement as a method for reducing stormwater runoff and improving stormwater quality. Pervious concrete is one of several pervious pavement systems that can be used to reduce stormwater runoff and treat stormwater on site. Pervious concrete systems have been used and are being proposed for all parts of the United States, including northern climates where severe freezing and thawing can occur. The purpose of the research is to develop pervious concrete mixtures that have sufficient porosity for stormwater infiltration along with desirable porosity, strength, and freeze-thaw durability. In this research, concrete mixtures were developed with single-sized river gravel aggregate (4.75 mm) and constant binder contents, together with high range water reducer. River sand was used as a replacement for up to 7 % coarse aggregate. Two different types of polypropylene fibers (a shorter fibrillated variable-length and a longer fibrillated single-length) were incorporated at several addition rates from 0 to 0.1 % by volume of concrete. The engineering properties of the aggregate were evaluated along with the porosity, permeability, strength, and freeze-thaw durability of selected concrete mixtures. The results indicate that the use of sand and fibers provided beneficial effects on pervious concrete properties, including increased strength, maintained or improved permeability, and enhanced freeze-thaw resistance.

Pervious Concrete Mixture Proportions for Improved Freeze-Thaw Durability

Portland cement pervious concrete (PCPC) is a material of increasing interest for parking lots and other applications. PCPC typically consists of coarse aggregates, portland cement, water, and various admixtures. Similar materials are used for cement-stabilized drainage layers in highway and airport pavements. In this research, in-service PCPC pavements were inspected in the field, and cores were removed in order to investigate properties in the laboratory. Field evaluation methods included visual inspection, two surface drainage measurements, and an indirect-transmission ultrasonic pulse velocity (UPV) test. Laboratory testing methods included void ratio, unit weight, compressive strength, splitting tensile strength, hydraulic conductivity, and direct-transmission UPV. Because it is compacted on the surface with screeds or rollers, PCPC generally has higher strength, lower void ratio, and lower permeability at the surface than at the bottom. Therefore, the properties of the tops and bottoms of core sampl...

Field and Laboratory Evaluation of Pervious Concrete Pavements

Portland cement pervious concrete (PCPC) has an excellent performance history in the Southeastern United States, but until recently has seen limited use in environments with significant freeze-thaw cycles. Therefore, assessment of actual field performance is important. This project documents field observations, and nondestructive testing results of PCPC sites located in the states of Ohio, Kentucky, Indiana, Colorado, and Pennsylvania. PCPC is most often used as a pavement for parking lots. Field performance depends on the quality of the mixture as well as proper control of construction and curing. In addition to field observations and nondestructive testing, laboratory testing was performed on cores removed from some of the test sites. Generally, the PCPC installations evaluated have performed well in freeze-thaw environments with little maintenance required. The research goals included developing recommendations as to how to build PCPC pavements in freeze-thaw environments, and how to prevent clogging. Observations suggest that providing sufficient drainage under PCPC pavements to keep them from becoming saturated in freezing weather is likely to be effective. Site specific observations of clogging patterns provided insight into sources of clogging, and how these may be avoided.

Portland cement pervious concrete pavement: field performance investigation on parking lot and roadway pavements

Portland Cement Pervious Concrete (PCPC) has an excellent performance history in the Southeastern U.S., but until recently has seen little use in environments with significant freeze-thaw cycles. Therefore, assessment of actual field performance is important. This paper documents field observations and nondestructive testing results from PCPC sites located in the states of Ohio, Kentucky, Indiana, and Colorado. PCPC is a zero-slump, open graded material consisting of coarse aggregate, Portland cement, water, and admixtures. The main advantage of PCPC is the ability to control runoff and recharge ground water. It is most often used as a pavement for parking lots. Field performance depends on the quality of the mixture as well as proper control of construction and curing. In addition to field observations and nondestructive testing, laboratory testing was performed on cores removed from some of the test sites. For the most part, the PCPC installations have performed well in freeze-thaw environments with little maintenance.

Aleksandar Mrkajic

Papers

Field and Laboratory Evaluation of Pervious Concrete Pavements

Portland cement pervious concrete pavement: field performance investigation on parking lot and roadway pavements

Field Performance Evaluation of Pervious Concrete Pavements in Freeze-Thaw Environments