Pervious concrete

About: Pervious concrete is a research topic. Over the lifetime, 2920 publications have been published within this topic receiving 27720 citations. The topic is also known as: porous concrete & permeable concrete.

The sustainable use of concrete

Abstract: Introduction References Sustainability Natural History Human Beings and Concrete Genealogy of Sustainability Pillars of Sustainability References Sustainability in Concrete and Construction Environmental Aspects Social and Economic Aspects References Evaluation Systems of Sustainability Life Cycle Assessment (LCA) Environmental Standards for Buildings Systems of Environmental Impact Evaluation Environmental Standards for Concrete Sector Evaluation of Social and Economic Aspects Tools of Environmental Effect Evaluation for Buildings References Technologies for Concrete Sustainability General Concrete Concrete Structures References Sustainable Concrete Technologies: Case Studies CO2 Negative Concrete in Japan Low Carbon High-Flowable Concrete High-Performance Shotcrete Closed-Loop Concrete System on Construction Site Concrete Pavement Ultra-High Strength Fiber Reinforced Concrete Adaptable Super High Rise Residential Buildings Utilization of Thermal Mass of Concrete Pervious Concrete References Future Perspectives Existing Perspectives New Perspectives Wishful Thinking References Index

Method for the production of water-permeable porous concrete

Abstract: A method for the production of a water-permeable porous concrete comprising the steps of mixing a concrete mixture containing A. GRANULAR MINERAL AGGREGATES OF A UNIFORM GRAIN FRACTION IN THE RANGE OF 3 TO 30 MM WITH A TOLERANCE RANGE OF 4 TO 15 MM, B. HYDRAULIC CEMENT IN THE PRESCRIBED AMOUNT ACCORDING TO THE JOB SPECIFICATIONS, C. A MACROMOLECULAR WATER-SOLUBLE COMPOUND IN AN AMOUNT OF FROM 0.05 TO 2 PERCENT BY WEIGHT BASED ON THE CEMENT, SAID COMPOUND BEING SELECTED FROM THE GROUP CONSISTING OF PLANT GUMS, STARCH PRODUCTS, CELLULOSE ETHERS, AND SYNTHETIC POLYMERS. D. WATER IN SUCH AN AMOUNT THAT THE WATER-CEMENT RATIO IS BETWEEN 0.32 AND 0.48 WHEREBY SAID CONCRETE MIXTURE IS SPRAYABLE, AND PLACING SAID CONCRETE MIXTURE BY SPRAYING, AS WELL AS THE HARDENED CONCRETE MIXTURE.

The Effect of Curing on the Strength and Permeability of PFA Concrete

Abstract: This paper describes how tests were carried out on a series of concrete mixes that were designed to equal workability and compressive strength with a range of pulverized fuel ash (PFA) levels in order to study the effect of curing on the strength and permeability of PFA concrete. Concrete specimens were subjected to a range of moist-curing periods prior to air storage. Compressive strength was determined at various ages and permeability to oxygen and water was determined at 28 days. Results confirm the importance of curing, with reductions in the curing period resulting in lower strength, more permeable concrete. The strength of the PFA concretes appears to be more sensitive to poor curing than ordinary portland cement (OPC) concrete, the sensitivity increasing with increasing PFA content. However, despite exhibiting lower strengths, PFA concretes moist-cured for only one day were, generally, no more permeable to water and substantially less permeable to oxygen than similarly cured OPC concretes. As the period of curing increased, the PFA concretes became considerably more impermeable to water and oxygen than the OPC concretes. These results are discussed in the context of the minimum periods of curing and protection recommended in BS 8110. It is argued that although the increased curing periods suggested for PFA concrete are justified on the basis of concrete strength, PFA concrete may require no more curing than OPC concrete to achieve equal durability, as measured by oxygen and water permeability.

Laboratory Evaluation of Eco-Friendly Pervious Concrete Pavement Material Containing Silica Fume

Abstract: Pervious concretes, such as sustainable pavement materials, have great advantages in solving urban flooding, promoting urban ecological balance, and alleviating urban heat island effect, due to its special porous structure. However, pervious concrete typically has high porosity and low strength. The insufficient strength and poor freeze-thaw durability are important factors that restrict its wide application, especially in seasonal frozen areas. Improving the strength and freeze-thaw resistance of pervious concrete will expand its application. Silica fumes, as an industrial by-product waste and supplementary cementitious material, play an important role in improving concrete performance. The objective of this paper was to study the effects of silica fumes on properties of sustainable pervious concrete. Silica fumes were used to replace cement with the equivalent volume method at different levels (3%, 6%, 9%, and 12%). The control pervious concrete and silica fume-modified pervious concrete mixtures were prepared in the lab. The porosity, permeability, compressive strength, flexural strength, and freeze-thaw resistance properties of all mixtures were tested. The results indicated that the addition of silica fumes significantly improved the strength and freeze-thaw resistance of pervious concrete. The porosity and permeability of all pervious concrete mixtures changed little with the content of silica fumes due to the adoption of the equal volume replacement method.