Some pretty good looking bricks!
Finally the day has come to make mud bricks! YAY! I was not able to sleep at all last night due to the anticipation and the anxiety over doing an actual mud brick training, but now that the morning is finally here I am more than ready to do this.
The head of the camp has asked that representatives from all of the different sectors come to participate in the trainings and then help to make all of the bricks for the final building. Hopefully the same people who helped to make the bricks will be back in May when we build the final structure so they can see the whole process.
The day started by 19 volunteers, the 2nd in Charge, the TB lab tech, Mweh Paw, and myself gathering around our large mud pit. There I started by explaining how to decide on what soil to use and how you know when the soil you have picked is appropriate to use. I suggested that three tests of visual, smell, and touch can help you identify the basic properties of if a soil can be used for mud brick making. Simply put the visual test helps you to see the homogeneity of the soil you have, the smell test helps you decide if there is organic material that could possibly corrupt your mud brick mixture integrity, and the touch test helps you decide if the mixture is mostly sand or clay, which then effects what additives are necessary.
On top of these three basic tests there are two more tests that can help with the understanding of the soil you are working with and most importantly what might need to be added to make the final mud brick mixture stronger. The first test involves getting the soil sample slightly wet and then rolling into a palm sized ball. Once the ball is rolled you then smash the ball against the palm of your hand and see how much water leaks out and how the flattened ball looks when deformed. If little to no water comes out that means that the mixture is mostly clay, unlike with sand where the water would freely leak out, it also tells you how the soil will act when the water in the mud brick mixture starts to evaporate. Will it crumple into small pieces or bind together? These are important things to know especially for the next test which is where you roll the hydrated soil sample into a long skinny log, and by holding it only on one end, see how far you can cantilever the other end before it breaks. If the piece breaks between 5cm and 15cm then the soil you have is good soil to use for mud brick making. These were the main tenants that I put out there as easy ways to see if you have suitable soil.
Here in the camp the soil is mostly clay and very homogenous, we then talked about what you might need to add to a clay type soil in order to make it stronger. Clay type soils are great for making mud bricks, since they are very cohesive and do not shrink much when drying, however they do need to have an additive of some sort to give the bricks tensile strength. For this training session I decided to show the volunteers how to make bricks using both bamboo and straw to try to reinforce the idea that almost any type of organic fiberus material can be used as an additive. This project is not only about teaching how to make and build with mud bricks, but also showing how it is a cheap way to build with all local materials.
So after a little tea and overly sweet coffee break it was finally time to get dirty! I started by showing them how to make a bamboo brick, since we were doing bamboo bricks in the morning and straw bricks in the evening. I started by lining the bottom of the hole with bamboo cuttings and then adding the soil that I had already previously prepared. The soil preparation that I had done earlier was simply taking out any large rocks and plants and then making sure that there were no large clumps of soil that would not become fully saturated with water when I was mixing it with the bamboo and therefore weaken the final mud bricks. I then slowly stated to add water and need the mixture until the bamboo pieces were spread out evening in the soil. I constantly kept making the mud into a ball form and then breaking open the middle of that ball to check that the mixture was wet all the way through, that there were no soil clumps that were still dry, and that the mixture had become a cohesive combination of both soil and bamboo.