Etching new concrete is done to prevent exposure to which substance?

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Study for the California C-33 License Exam with comprehensive questions and detailed explanations. Prepare for success with our targeted practice quizzes and enhance your understanding of painting and decorating contractor requirements.

Multiple Choice

Etching new concrete is done to prevent exposure to which substance?

Etching new concrete targets the high alkalinity present in fresh cement. Fresh slabs carry a strong alkaline surface due to calcium hydroxide and other soluble compounds. This alkali layer, along with any laitance, can prevent coatings from bonding properly and can lead to adhesion failures later. By etching, you remove the surface laitance and other contaminants and create a slightly rough profile that allows the coating to key in mechanically. This reduces the risk of alkali-related issues such as poor adhesion and premature failure.

Dust, oil, and moisture are concerns elsewhere—dust and curing compounds are cleaned off, oil requires degreasing, and moisture issues are handled by drying or moisture barriers. But etching is specifically about mitigating exposure to alkali to improve adhesion.

Etching new concrete is done to prevent exposure to which substance?

Study for the California C-33 License Exam with comprehensive questions and detailed explanations. Prepare for success with our targeted practice quizzes and enhance your understanding of painting and decorating contractor requirements.

Etching new concrete is done to prevent exposure to which substance?

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