import type { ConcreteInput, ConcreteResult } from './types.js';
/**
 * Calculate concrete mix design quantities
 *
 * @param input - Concrete grade and volume
 * @returns Material quantities in kg (cement, sand, gravel) and liters (water)
 * @throws {RangeError} unknown grade, or volume ≤ 0
 */
export declare function concreteMix(input: ConcreteInput): ConcreteResult;
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