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Sub-Systems Design Review. P14416 Concrete Arborloo Base October 29, 2013. Team Intro. Agenda. Background Functional Decomposition/Architecture Updated Customer Requirements Subsystems Geometry Composition Compression Test Results Features Cost/Trade-off Analysis

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sub systems design review

Sub-Systems Design Review

P14416

Concrete Arborloo Base

October 29, 2013

agenda
Agenda
  • Background
  • Functional Decomposition/Architecture
  • Updated Customer Requirements
  • Subsystems
    • Geometry
    • Composition
      • Compression Test Results
    • Features
  • Cost/Trade-off Analysis
  • Engineering Requirements
  • Project Management Updates
arborloo
Arborloo
  • A latrine-like sanitation device designed to function over a small pit and to be moved to a new pit when filled
  • Utilize compost by planting tree in used pit
  • Purpose to provide affordable sanitation in poor, underdeveloped areas
    • Originally designed for use in Zimbabwe (Peter Morgan)
meeting with francius estimable johnny
Meeting with FranciusEstimable (Johnny)

Weight

Price: ~25 USD = 1100 HTG

Type of Cement is still unknown

Prefers a DIY kit to educate locals

Design should be simple

updated customer requirements
Updated Customer Requirements

2) Simpler the better

2) Weight

1) Cost

  • 25 dollars
  • Make it available to all Haitians coming from different economic states
  • Easy to make
  • Simple mold
  • Limited materials/ ingredients
  • Make it transportable through all environments
  • Can be moved by 1-2 people comfortably
meeting with manitou
Meeting with Manitou
  • Self consolidating Concrete
    • Self Leveling
    • Higher Slump
    • No Vibration
    • Chemical Needed (Water Reducer)
  • More Efficient Mix Ratio
    • More Aggregate
    • Less Cement
  • Specific Gravities
  • Finishing Tools
  • Use of Fibers
geometry
Geometry
  • Shape
  • Thickness
  • Feasibility of Molds
theoretical analysis
Theoretical Analysis

Θ

b: width into the board

σcomp=

σflex=

Maximum allowable flexural and compressive strength for each mold design:

Assume square slab

To make up for the lack of stress concentrations due to the hole: Factor of Safety of 3

feasibility of molds
Feasibility of Molds
  • Wood
    • Plastic sheets (release agent)
    • Reusable
    • Not as precise
  • Metal
  • Plastic
  • Plastic injection methods
  • Foam
    • Expensive (concrete canoe~$800)
    • Very accurate
    • Trying to figure out the release agent
composition
Composition
  • Aggregates
    • Bind properly
    • Provide strength
    • Reduce cost
  • Cement Replacements
mixtures
Mixtures
  • 6 different mixtures (each contained cement, course aggregates, fine aggregates, and water)
  • Cement (ternary mix)
    • Portland, slag, fly ash (improves strength, workability, and requires less water)
  • Aggregates (all mixtures contained sand)
    • Course
      • Coconut shells
      • Rubber
      • Limestone
    • Fine
      • Sand
      • Plastic Beads
      • Styrofoam
slide16
Why?
  • Slag and fly ash improve strength of concrete when combined with Portland
  • Aggregates can be found in Haiti
      • Coconut shells
        • considered trash/ in abundance
      • Rubber
        • Need to figure out a way to grind up tires
      • Limestone/Sand
        • In abundance in Haiti
      • Plastic Beads/Styrofoam
        • Could grind up plastic water bottles
cylinder testing procedure
Cylinder Testing Procedure
  • Slump test: General idea on mold capability as well as the proper amount of water
  • After 7 days/28 days of curing
    • ASTM C39: radius= 4” height= 8” Cylinder is loaded axially. Determines maximum compressive strength (psi)
cylinder plan
Cylinder Plan

70% Strength at 7 days

28 day Accepted Standard

Fibers add mild Compression Strength

Limestone/Rubber/ Coconut/Shells/Sand/Stryofoam/Plastic

big picture results
Big Picture Results
  • Quality:
    • Availability: aggregates (coconuts and sand)
    • Mixture mass is heavily driven by cement and sand volumes
    • Glenium (HRWR): reduces the amount of water
  • Quantity:
    • Price
    • Compressive Performance
    • Weight
improvements moving forward
Improvements Moving Forward
  • Add more aggregate
    • Used too much cement in first round of testing
    • Will reduce weight
  • Make more viscous (less water)
    • Styrofoam floated to the top of cylinders
    • Use Glenium
  • Use of finer aggregates
    • Sand is more dense than concrete
    • Higher strength with less voids
features
Features
  • Modular upgrades for additional cost
  • Prepare basic design to allow for add-ins
      • Handles
      • Textures
      • Shelter connection points
transportability
Transportability

$5.98

All require holes and screws

$2.80

$4.12

$0.48

  • Handles
  • Wheels
  • Rope Attachments
  • Terrain is too rough for wheels
  • Anchor bolts require $ and drill
  • Mold holes in sides for handles/hooks
    • Can this be done?
  • Multi-functional attributes  simplicity
shelter interface
Shelter Interface
  • Grooves?
    • Sheet metal connection
  • Small size?
    • Also reduces material and weight
    • Depends on ground hole
  • Holes?
    • Consistent with transportability features
    • Pole connection
odor pest reduction
Odor/Pest Reduction
  • Cheap, simple cover
  • What can be reused?
  • Simple hinge?
  • Additional holes for toilet seat cover?
  • Recommendation for household materials to use
    • Five gallon bucket
material costs
Material Costs

*Reflects Cost in Haiti

fly ash slag
Fly Ash/Slag?
  • Need to evaluate cost/strength trade-off
    • Fly ash and slag are not produced in Haiti
    • Shipping costs are unknown
engineering requirements
Engineering Requirements
  • Purchase Cost
    • Plastic expensive
    • <15$
  • Load it can support
    • Compression Results
    • Only 70% strength
  • Ground Hole size  Over design
  • Weight
    • Average weight per/cylinder =
    • Per/arborloo=
moving forward
Moving Forward
  • Refining concrete mixtures
    • Aggregates for low cost compressive strength
  • Flexural testing
    • Mold for test block
    • Finalize reinforcements
  • Cost estimates
    • Availability in Haiti
    • Shipping costs
  • Finalizing features
    • Continue to assess feasibility