Precast Concrete Drainage Pits

This section focuses on the successful applications of 100% recycled PP fibres produced in this research in the precast concrete pit project. Due to the intellectual property rights, the names of the industries are omitted.

Materials and Specimens

The testing program was carried out on 6th October 2014. A set of concrete pits with fibres was cast for load testing and another set of current pit designs without

Processes of casing the concrete footpath

Fig. 7.2 Processes of casing the concrete footpath. a Footpath form work and a road roller compacting the soil base b Ready-mixed concrete pouring into the form work c 100% recycled PP fibre dispersing in the fresh concrete d Smoothing the surface of footpath e Edge smoothing and dummy joint f Finished footpath in the fresh stage g Water spraying for curing fresh concrete footpath h Footpath ready to use

Table 7.1 Details of testing specimens

Specimen name

Date tested

Load orientation

Reinforcement type

Control pit 1

17/09/2014

Vertical load test

Standard steel reinforcement

Control pit 2

18/09/2014

Vertical load test

Standard steel reinforcement

Fibre pit 1

17/09/2014

Vertical load test

6 kg/m3 recycled PP fibre

Fibre pit 2

24/09/2014

Vertical load test

6 kg/m3 recycled PP fibre

fibres was cast as control. This testing program involved load testing a concrete drainage pit base with a riser and a lid in vertical orientation to determine the maximum load capacity. In total four tests were conducted: two fibre reinforced drainage pits and two control steel reinforced drainage pits, as shown in Table 7.1. In this project, 6 kg/m3 of 100% recycled PP fibre with diamond indents were used. Concrete used was of 50 MPa target strength. Average compressive strength of concrete cylinders measured on the test date was 65 MPa. The tests were conducted at Structural Laboratory in James Cook University, Townsville. The test equipment consisted of a load testing frame, a rubber mat, a hydraulic cylinder, a load cell, and a wood block.

 
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