Abstract
The paper presents the study carried out for three special concretes like Pervious Concrete, Plastic Concrete and Controlled Low Strength Materials (CLSM) using locally available materials. Pervious concrete is a concrete with high porosity. It is used in a wide range of applications including pervious pavements and helps in improving pavement skid resistance and reducing hydroplaning. This concrete was designed to meet the requirement of 28-day compressive strength of 10 MPa and water permeability of 0.50 cm/sec. Plastic concrete has low compressive strength but higher ductility and lower permeability. It is used for creating an impermeable barrier (cut-off wall) for containment of contaminated sites or seepage control in highly permeable dam foundations. This concrete was designed to meet the requirement of 28-day unconfined compressive strength of 1.5 to 2.5 MPa and confined compressive strength of 2.5 to 3.5 Mpa at confining pressure of 4 Kg/cm2. Controlled Low Strength Material (CLSM) or flowable fill mixtures are typically specified and used in place of compacted fill especially for backfill, utility bedding, void fill and bridge approaches. CLSM is a self-compacting, flowable, low strength cementitious material which suits the requirement of different applications such as excavatable backfill and structural backfill. The properties of CLSM that were investigated included bleeding, density of hardened CLSM, permeability and unconfined compressive strength at 7 days and 28 days age.
Highlights
Pervious concrete is an open graded, zero slump material consisting of Portland cement, coarse aggregate, little or no fine aggregate, admixture and water (ACI, 2006)
The void content in pervious concrete can range from 35% to 18% with typical compressive strengths of 2.8 to 28 MPa and water permeability generally falls in the range of 81 to 730 L/min/m2 (0.135 to 1.22 cm/s) (ACI, 2006)
The aim of this study is to evaluate the performance of three different types of special applications concrete such as Pervious Concrete, Plastic Concrete and Controlled Low Strength Materials (CLSM) using locally available materials in civil engineering construction
Summary
Pervious concrete is an open graded, zero slump material consisting of Portland cement, coarse aggregate, little or no fine aggregate, admixture and water (ACI, 2006) It is called porous concrete, permeable concrete and no fines concrete. Plastic concrete, which is sometimes referred to as low strength concrete or artificial soil, consists of aggregate, cement, water, and bentonite clay mixed at a high water-cement ratio to produce a ductile material (Naderi, 2005). CLSM is a self-compacting flowable, low strength cementitious material consisting of lower cement content, higher fly ash and fine aggregate content, no coarse aggregate, mixed at high water-cement ratio. The aim of this study is to evaluate the performance of three different types of special applications concrete such as Pervious Concrete, Plastic Concrete and Controlled Low Strength Materials (CLSM) using locally available materials in civil engineering construction
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