Hullkrete and fiber-crete
Practivistas Dominicana - Student Projects
The alternative block project location is in Las Malvinas, a community outside of the main section of Santo Domingo. Our team is made of two Humboldt State students and we are taking classes in UNIBE. The block project that the group is conducting is made so that the community in Las Malvinas can create a more inexpensive and sustainable block that will later be used by a local company to substitute regular commercial building blocks.
The objective of this project is to recreate a cinder block made from products other than solely concrete. This new block must also be more cost and environmentally effective while still being able to withstand the climate and natural disasters that occur in the Dominican Republic.
Below is a table of the criteria used to evaluate project components and make decisions.
|Criteria||Constraints||Our Weight (0-10)|
|Aesthetics||Must resemble local architecture.||7|
|Production Cost||Must cost less than regular cinder blocks.||10|
|Durability||Must withstand weather and pressure.||10|
|Material Locality||Must attain materials near or within Las Malvinas.||7|
|Reproducibility||Ease to reproduce products.||9|
|Safety||Must be safe both structurally and in the process of creation||10|
|Community Involvement||Must include the local community members in the creation of this project||8|
|Environmental Impact||Blocks should have a smaller footprint than concrete blocks||7|
See our Literature Review for relevant research completed for this project.
The budget tables will include 3 different types of table which are for the purpose of replicating the blocks, the overall cost of manufacturing the blocks, and the research cost.
|Quantity||Material||Source||Cost (RD$)||Total ($)|
|4 bags||Cement Bag||Block factory in Las Malvinas||250||/|
|8 wheelbarrow||Sand||Block factory in Las Malvinas||120||/|
|10 sacks||Rice hulls||Destileria "La Isabella"||/||/|
"Thursday June 19, 2014"
- Used initial materials gathered and made first batch of blocks.
- After making blocks cleaned coconuts for upcoming batch and smashed coconuts to size of gravel used in mixes.
- Finished digging trenches for the police station foundation.
"Considerations for Next Batch"
- Use less water. Mixture was very wet and would produce better results out of the press by using 8-9 gallons of water instead of 12.
- Use a better sifter for the ash. Most large particulates were filtered out but some larger pieces of hardened concrete were in the mix.
"Friday June 20, 2014"
- Acquired two 55 gallon drums of sawdust from a coffin maker next to the block factory. Soaked the sawdust in water and a bag of lime per drum overnight for use the next day in blocks.
- Tied rebar for foundation in the Destacimento.
"Saturday June 21, 2014"
- Acquired more coconuts for use in future mixes for blocks.
- Made two batches of sawdust blocks. One using sawdust as a aggregate replacement and a second using sawdust and the coconut shells as aggregate replacements. Cracking occurred in only a few blocks and the workers were optimistic about the quality of the blocks.
- Continued to dig trenches and tied rebar for the Destacimento.
"Monday June 23, 2014"
- Tied rebar for the Destacimento.
- Smashed coconut for future batches
"Tuesday June 24, 2014"
- Acquired 157 lbs of newspaper from Listin Diario. Tore newspaper for 2 hours with the help of children from the community and the group working on the Destacimento.
- Acquired a 55 gallon drum to soak the newspaper.
- Poured concrete at the Destacimento.
"Wednesday June 25, 2014"
- Pupled paper by hand and put out for drying.
"Thursday June 26, 2014"
- Pulped more paper by hand and put out for drying.
- Shelled and smashed coconuts.
- Poured more concrete at Destacimento.
"Friday June 27, 2014"
- Acquired 1 barrel of sawdust from the coffin maker.
"Saturday June 28, 2014"
- Made 5 different batches of blocks. 1 coconut, 2 sawdust, and 2 paper.
"Sunday June 29, 2014"
- Checked on the progress of the bricks made the day before.
- Laid brick for walls at the Destacimento.
"Tuesday July 1, 2014"
- Tested blocks at UNIBE
"Wednesday July 2, 2014"
- Worked on presentation for Thursday
"Thursday July 3, 2014"
- Presentation at UNIBE
|Ingredient||Type of measurement||Soviet Blocks||Cococrete||Papercrete||Papercrete w/ Gravel||Sawdust #1||Sawdust #2|
|Cement||Bag (90 lbs)||1 1/5||1||0.5||1.5||1||1|
|Rice Hull Ash (RHA)||Wheel Barrow||3||0||0||0||0||0|
|Compression Test (PSI)||190.0||127.5||57.3||66.6||101.0||82.2|
|Weight per Block (Pounds)||29.2||25.9||20.9||23.2||22.1||23.9|
|PSI per Pound||6.5||4.9||2.7||4.4||3.7||2.8|
|Price per Block (RD $)||13||15||19||15||10||9|