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// CODE SNIPPET

1803.5.3 Expansive Soil

Building Code 2018 of Illinois > 18 Soils and Foundations > 1803 Geotechnical Investigations > 1803.5 Investigated Conditions > 1803.5.3 Expansive Soil
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In areas likely to have expansive soil, the building official shall require soil tests to determine where such soils do exist.
Soils meeting all four of the following provisions shall be considered to be expansive, except that tests to show compliance with Items 1, 2 and 3 shall not be required if the test prescribed in Item 4 is conducted:
  1. Plasticity index (PI) of 15 or greater, determined in accordance with ASTM D4318.
  2. More than 10 percent of the soil particles pass a No. 200 sieve (75 µm), determined in accordance with ASTM D422.
  3. More than 10 percent of the soil particles are less than 5 micrometers in size, determined in accordance with ASTM D422.
  4. Expansion index greater than 20, determined in accordance with ASTM D4829.

Related Code Sections


1803.5.3 Soils and Foundations, Expansive Soil
In areas likely to have expansive soil, the building official shall require soil tests to determine where such soils do exist. Soils meeting all ...
Building Code 2018 of Illinois > 18 Soils and Foundations > 1803 Geotechnical Investigations > 1803.5 Investigated Conditions > 1803.5.3 Expansive Soil
1803.5.3 Soils and Foundations, Expansive Soil
In areas likely to have expansive soil, the building official shall require soil tests to determine where such soils do exist. Soils meeting all ...
Building Code 2021 of Illinois > 18 Soils and Foundations > 1803 Geotechnical Investigations > 1803.5 Investigated Conditions > 1803.5.3 Expansive Soil
1808.6 Soils and Foundations, Design for Expansive Soils
Foundations for buildings and structures founded on expansive soils shall be designed in accordance with Section 1808.6.1 or 1808.6.2. Exception ...
Building Code 2018 of Illinois > 18 Soils and Foundations > 1808 Foundations > 1808.6 Design for Expansive Soils
1808.6 Soils and Foundations, Design for Expansive Soils
Foundations for buildings and structures founded on expansive soils shall be designed in accordance with Section 1808.6.1 or 1808.6.2 ...
Building Code 2021 of Illinois > 18 Soils and Foundations > 1808 Foundations > 1808.6 Design for Expansive Soils
1808.6.2 Soils and Foundations, Slab-On-Ground Foundations
Moments, shears and deflections for use in designing slab-on-ground, mat or raft foundations on expansive soils shall be determined in accordance ...
Building Code 2018 of Illinois > 18 Soils and Foundations > 1808 Foundations > 1808.6 Design for Expansive Soils > 1808.6.2 Slab-On-Ground Foundations
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