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Licensed for the sole use of the purchaser.See license agreement penalties for distribution. PAGE 8 COMPRESSED GAs ASSOCIATION INC. CGA G-1.5-2015 9.2 Industrial water treatment Carbide lime precipitates the calcium and magnesium bicarbonate hardness for subsequent removal by filtra- tion. Carbide lime can also be used for pH control. 9.3 Sewage and waste treatment Carbide lime is being used as a coagulating materiall in sewage treatment. Carbide lime can also be used in coating the solids from a sewage treatment plant to aid in odor, insect, and parasite control. 9.4 Masonry Carbide lime can be used in the manufacture of concrete, brick, precast cinder, and concrete block. The addi- tion of hydrated lime to masonry increases surface smoothness, resistance to water absorption, and decreases brittleness. 9.5 Stabilization 9.5.1 Stabilization of soil Carbide lime has gained recognition as an effective stabilizer for a wide range of clay soils. Experience has shown that lime will react with medium, moderately fine, and fine grained soils to produce decreased plasticity, increased workability, reduced swelling, and increased strength. Many clays are reactive and upon lime stabili- zation their strength may easily triple or quadruple. Some common uses are for road beds, parking lot subsoil, and building bases. 9.5.2 Lime slurry pressure injection In this technique, lime slurry is pumped into the soil under pressure at depths of surface layers to 40 ft (12 m) or more forming a network of interconnecting, sheet-like seams.These seams act as moisture barriers prevent- ing the movement of moisture either into or out of the soil. Swelling or shrinkage of the soil is eliminated. Lime slurry pressure injection (LSPI) can be used either on existing or before construction of structure foundations, railroad beds, and road beds. 9.5.3 Erosion control Carbide lime has been used successfully as an ingredient for erosion control and construction repair because of its characteristics for soil hardening [7]. 9.5.4 Landfill construction Carbide lime can be used as an alkaline liner for hazardous materials landfills, owing to its ability to chemically stabilize metals, and neutralize acid wastes. Additional benefits can be had from the pozzolanic reactions of lime and soil producing a hard, impermeable crust. Additionally, carbide lime can be used as a capping material for landfills, to ensure that alkaline conditions are maintained [7]. 9.6 Agriculture—soil conditioning Soil is a complex material possessing varying chemical, biological, and physical properties. The effect of lime on soils varies with the character of the soil. Lime applied to soil can: - neutralize soil acidity; - promote the activity of beneficial bacteria and depress injurious soil organisms; - replenish the supply of calcium; This document licensed for the sole use of the purchaser. It may not be shared with any other person or used after the expiration date without the express written permission of the CGA. Any unauthorized use, reproduction, distribution, or modification of this printed page will result in a$5,000 liquidated damages fee plus loss of access to CGA publications for one year for your company.