Jim Hallock

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Presentation on CEBs

See seismic discussion at https://youtu.be/IuQB3x4ZNeA?t=1734

Presentation on Lime Stabilization to OSE


  1. What is your general outlook regarding the CEB industry and sustainable construction in general? (emerging trends, best practices, leading organizations, public perception, etc.)
  2. What can you tell us about experimental data on block mixtures and their performance?
  3. How does climate affect CEB Construction? Are there resources we can use as guides?
  4. Do you have the capacity to assess our CEB Press design as an independent design reviewer?
  5. Do you know of building designs that fit the OSE Specification? (modularity, low cost, high performance, open source, lifetime design/longevity)
  6. Can you tell us about techniques that have emerged as best practices?
  7. Who is providing the best training courses in CEB building in the world?
  8. What other organizations should we turn to?



These are my notes I took from watching his video on lime stabilization in 10/2018. Aidan Williamson (talk) 20:58, 12 July 2019 (UTC)

NRCS local office Conservation District

ph lime 12.4 is what we want

One sample: (% by weight) 5% ph 11.5 6 11.8 (max out) 9 11.8 keep going until you make sure you can't go higher

Use a ph meter. Calibrated with a calibration tube 25 gram sample variable lime percentages use 150mm bottle fill to 150mm with distilled water Check the pH of the distilled water - should be 7.0 soil should be sieved. maybe (3/8" sieve for block production)

The soil needs to be a high concentration of clay to use lime

sampling method is site specific. James Hallock does 2-3 best method is a profile hole. walk down in and see the layers obviously, get below the top soil

Callibrate mixer in field by filling a bucket and converting weight to volume measurements The mixer is a double hopper machine. Soil in one, sand and stabilizer in another. Belt feed additives to auger chamber

Curing time: 28 days is standard for lime and cement Cement is faster to use. Can be a rock in 10 days Lime stabilized sits for 28 days in a cool, covered place. Can't really control the temperature in reality. the slower they cure, the better Lime reacts to electic charge of clay.

Colorado: 14" thick wall with 2" insulation on the outside for cheap shit

Moisture added right at the end of mixing about 10% moisture ball it up - if you poke it with your finger it should fall apart

Homogeneity of mix is established before production (duh)

Test results help onboard engineers and architects. Ongoing test results - maybe 1 block in 1000 You can make rooves out of the blocks

Mortar: same as blocks with more sand and more stabilizer. mortar isn't compressed so it needs more stabilization. Milkshake consistency. Want to pour it. It's not like fired bricks. Airplane the joints to lay faster.

Example: incease sand by about 50%, double the stabilizer amount

Testing Mortar: Glue 3 blocks together. Cure for 2 weeks. Support both end blocks. center block is unsupported. add weight until joint fails.

Building: story pulls 3x3x3/16"x10' angle for the corners. square the story pull so course is level and plum. takes time to put up story pull but it's really useful.

External Links

  • CEB compressive strength testing paper, France - [1]
  • 2015 thesis on stabilized and unstabilized CEB - [2]
    • Immersion test spec - [3]
  • Absorption of water in cement stabilized block is about 10% - [4]. Lime was found insufficient to stabilize for water, but cement was sufficient.
  • Related CEB stabilization papers - [5]