Sub systems design review
This presentation is the property of its rightful owner.
Sponsored Links
1 / 38

Sub-Systems Design Review PowerPoint PPT Presentation


  • 91 Views
  • Uploaded on
  • Presentation posted in: General

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

Download Presentation

Sub-Systems Design Review

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Sub systems design review

Sub-Systems Design Review

P14416

Concrete Arborloo Base

October 29, 2013


Team intro

Team Intro


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)


Functional decomposition

Functional Decomposition


Functional architecture

Functional Architecture


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


Theoretical graph

Theoretical Graph


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


Sub systems design review

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


Sub systems design review

*weight measured before curing


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


Results from 7 day cylinders

Results from 7 Day Cylinders


Mix performance

Mix performance


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


How to make it visually appealing and simple at the same time

How to make it visually appealing and simple at the same time:


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


Cost breakdown

Cost Breakdown


Summary of results

Summary of Results


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=


Project schedule past current

Project Schedule: Past/Current


Project schedule future

Project Schedule: Future


Budget tracker

Budget Tracker


Updated risk assessment

Updated Risk Assessment


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


  • Login