Testing!

I finally started testing the chemicals last week. Yay! I know I'm about a month off schedule and that the project is due in barely a week, but I made a plan last week. I've stayed on track for the past 6 days. Here is what the past 6 days have looked like:

Chemical	Spray/Soak Time	Test Time	Amount of Chemical	Amount of Water Sprayed	Amount of Water Collected	Notes	Retest?
Control (nothing)	9pm 4/26-7pm 4/27	7:30-8:00	N/A	250ml	0
Sakrete	9pm 4/26-7pm 4/27	7:25-7:55	500ml	250ml	0	Edges crumbly and green on second day
Gypsum	9pm 4/26-7pm 4/27	8:04-8:34	250ml (60ml gypsum+250ml H2O)	250ml	~30ml (retest needed)	Retest needed	Yes
Alcohol and Burn	7pm 4/28 (but n/a)	9:41-10:11	500ml	250ml	~20ml	250ml spray then burn; 250ml spray while burning. Surface hot	No; unrealistic
Vinegar	7:15pm 4/28-9pm 4/29	9:13-9:43	250ml	250ml	~40ml	Bubbling a little after sprayed chemical	Yes
Ammonia	6:30pm 4/28-9pm 4/29	9:09-9:39	250ml	250ml	0	Poured instead of sprayed chemical
Hydrochloric Acid	3:45pm 4/30-4pm 5/1	4:33-5:03	250ml	250ml	~40ml	Foamed up yellow/green when poured chemical; Poured because of danger	No; unrealistic
Bleach	3:30pm 4/30-4pm 5/1	3:59-4:29	250ml	250ml	50ml		Yes; a lot of H20
Hydrogen Peroxide	3:20pm 4/30-4pm 5/1	3:56-4:26	250ml	250ml	~10ml	Greenish square formed in center; Fizzing/bubbles when spraying chemical	No; not enough
Sulfuric acid	3:20pm 5/2-4pm 5/3	4:20-4:50	250ml	250ml	15ml	Bubbling/fizzing when sprayed chemical	No; unrealistic
Coke	3:30pm 5/2-4pm 5/3	4:54-5:24	250ml	250ml	20ml
Calcium Chloride	3:15pm 5/2-4pm 5/3	4:23-4:53	250ml	250ml	10ml	White residue on concrete after 24 hours	No; unrealistic
Seawater	6pm 5/4-4:30pm 5/5	4:33-5:03	250ml	250ml	0	Salt residue on tub after 24 hours
Dry Ice	6pm 5/4-4:30pm 5/5	4:30-5:00	5 lb	250ml	0	All dry ice gone after 24 hours

Basically, I spray the concrete with 250ml of chemical one day and let it soak until the next day afternoon. After those ~24 hours, I put the slab on top of a bucket and spray it with 250ml of water. I let the water sit for 30 minutes, then measure how much has dripped through the concrete and into the bucket below.

There may be a few flaws in this experiment, including water seeping into the bucket from the edges of the slab and differences in amount of water actually landing on the concrete. To remedy this I will be retesting some of the highest performing materials. Here are my retest results:

Chemical	Spray/Soak Time	Test Time	Amount of Chemical	Amount of Water Poured	Amount of Water Collected	Notes
Gypsum	5pm 5/6-6pm 5/7	6:13-6:43	250ml (60ml gyspum)	250ml	55ml	Used crayon wax as sealant; no visible drip into bucket from sides
Vinegar	5pm 5/6-6pm 5/7	6:22-6:52	250ml	250ml	30ml	Used candle wax as sealant; no visible drip into bucket from sides
Bleach	5pm 5/6-6pm 5/7	6:59-7:29	250ml	250ml	50ml	Used candle wax as sealant; no visible drip into bucket from sides