Geosynthetics MCQ with answer and solution

Concept

Common geosynthetic types are geotextiles, geogrids, geonets, geomembranes, geocells and geocomposites. 'Geogrout' is not one of them.

Step-by-step solution

1. List the standard geosynthetic types: geotextiles, geogrids, geonets, geomembranes, geosynthetic clay liners, geocells, geofoams, geocomposites. 2. Compare each option with this list. 3. Geotextiles, geogrids and geonets are in the list. 4. Geogrouts is not in the list, so the answer is C.

Explanation

Geosynthetics are man-made polymer sheets or nets used with soil. Geotextiles, geogrids and geonets are standard types. Grout is a cement or chemical fluid pumped into soil, and 'geogrout' is not a geosynthetic product.

Why the other options are wrong

A: Geotextiles are permeable fabrics, the most common geosynthetic. B: Geogrids are open grid sheets used for reinforcement. D: Geonets are net-like products used for in-plane drainage.

Shortcut

Grouting is a ground improvement method, not a polymer sheet. So 'geogrout' is the odd one out.

Common mistake

Students may confuse grouting (a ground improvement method) with geosynthetic products.