ACI Concrete Field Testing Technician Grade I 2026/2027 | 134 Questions & Answers | ASTM C1064, C143, C172, C138, C231, C173 & C31 | American Concrete Institute (ACI)

This comprehensive ACI Concrete Field Testing Technician Grade I 2026/2027 exam preparation document contains approximately 134 questions with answers covering the principal procedures used to sample, test, make, cure and handle freshly mixed concrete specimens. The material emphasizes ASTM C1064, C143, C172, C138, C231, C173 and C31, with exam-focused questions on concrete temperature, slump, representative sampling, density/unit weight, consolidation, pressure and volumetric air-content testing, concrete cylinders, curing and transportation. The document does not identify a university or a separate university course code, so American Concrete Institute (ACI) is used as the relevant institution in the title rather than adding an unsupported university affiliation. The first section concentrates on temperature measurement of freshly mixed concrete, including minimum sensor immersion, measuring-device accuracy and range, annual verification, acceptable measurement locations, sample preparation, required measurement time and temperature reporting. It also examines the purpose of temperature testing and whether a composite sample is necessary when temperature is the only determination being performed. The document then provides extensive coverage of the concrete slump test, including maximum aggregate size, wet sieving, slump-cone shape and dimensions, tamping-rod requirements, preparation of the testing surface, three-layer filling, 25 rodding strokes per layer and correct penetration into preceding layers. Additional questions cover removal of excess concrete, lifting the mold without twisting, measurement of the displaced original center and the time allowed to complete the test. The fresh concrete sampling material addresses representative composite samples from stationary, paving, revolving-drum, continuous and open-top mixers. Students review the 15-minute composite-sampling limit, remixing requirements, protection against rapid evaporation and contamination, minimum sample size for strength specimens, sampling intervals, the middle portion of truck-mixer batches and wet sieving when oversized aggregate is present. Another major section covers density/unit weight and consolidation procedures, including tamping rods, vibrators, strike-off plates, measuring bowls, mallets and equipment specifications. The questions distinguish when rodding or vibration is required according to concrete slump and review correct filling, consolidation, strike-off and preparation of the measure before weighing. These topics are particularly valuable for students learning the practical sequence and equipment requirements of fresh-concrete field testing. Detailed air-content testing is included for both pressure and volumetric methods. Pressure-method questions examine aggregate suitability, bowl capacity, wet sieving, rodding, vibration and mallet use. The volumetric method covers all aggregate types, measuring cups, 70% by-volume isopropyl alcohol, wet sieving, two-layer filling, rodding, tapping, funnel use, adjustment to the bottom of the meniscus, inversion and agitation, rolling operations, foam limits, readings to the nearest 0.25%, correction factors and conditions that invalidate the test. The final sections provide extensive preparation for ASTM C31-style making, curing, protecting and transporting concrete test specimens. Topics include 4 × 8-inch and 6 × 12-inch cylinders, rodding and vibration, flexural specimens, initial curing temperatures, standard versus field curing, specimen transportation and protection from jarring, freezing temperatures and moisture loss. The document also differentiates the purposes of standard-cured and field-cured specimens, making it useful for both certification review and construction-materials coursework. For authoritative study alongside this material, the American Concrete Institute's CP-1, Technician Workbook for Concrete Field Testing Technician—Grade I is the most directly relevant companion reference. The ACI Grade I certification program addresses the knowledge and ability required to perform and record fundamental field tests on freshly mixed concrete. ACI Concrete Field Testing Technician—Grade I APA Reference: American Concrete Institute. (2025). CP-1: Technician workbook for Concrete Field Testing Technician—Grade I (41st ed.). American Concrete Institute. ACI CP-1 Technician Workbook Relevant Students: This document is particularly relevant for ACI Concrete Field Testing Technician—Grade I candidates, civil engineering students, construction engineering students, construction management students, concrete technology students, materials and structural engineering students, construction materials testing students, concrete laboratory technicians, quality-control technicians, field technicians and concrete inspectors studying standardized fresh-concrete testing and specimen-handling procedures. 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