CE141L - Construction Materials and Testing Laboratory Manual

Vocabulary practice flashcards covering laboratory procedures, terminology, calculations, and standards from CE141L Construction Materials and Testing.

Fineness Modulus (Fine Aggregates)

A numerical index representing the mean size of particles in sand; higher values denote coarser aggregates, whereas lower values denote finer aggregates.

Sieve Analysis

A dry-sieving test procedure (ASTM C136) used to determine the particle size distribution of coarse and fine aggregates to assess compliance with design and production control specifications.

Well-Graded Sand

Sand containing a wide range of particle sizes, which is necessary to facilitate natural particle interlocking and proper bonding in concrete mixtures.

Sieving Time Criterion (ASTM C136)

The standard requirement specifying that after sieving agitation, not more than $1\%$ of the residue on any individual sieve will pass that sieve during $1\,\text{minute}$ of continuous hand sieving.

Sieve Analysis Mass Acceptance Criterion

The requirement that the total sample weight after sieving must not differ from the initial dry sample weight by more than $0.3\%$, otherwise results cannot be used for acceptance purposes.

Specific Gravity (Aggregate)

The ratio of the mass of a given volume of aggregate material to the mass of an equal volume of water at a specified reference temperature.

Bulk Specific Gravity (Oven-Dry)

The ratio of the oven-dry mass of aggregate in air to the mass of an equal volume of water, calculated as $\frac{A}{B - C}$ by accounting for the volume of both permeable and impermeable internal pores.

Bulk Specific Gravity SSD

The specific gravity of an aggregate calculated as $\frac{B}{B - C}$, assuming all permeable pore spaces within the constituent particles are completely filled with water.

Apparent Specific Gravity

The relative density of the solid material comprising aggregate particles, calculated as $\frac{A}{A - C}$, excluding the permeable pore space accessible to water.

Absorption (Coarse Aggregate)

The percentage increase in the mass of aggregate due to water penetration into permeable pore spaces compared to the oven-dry state, computed as $\left[\frac{B - A}{A}\right] \times 100$.

Cone Mold and Tamper Test (ASTM C128)

A test procedure using a conical frustum mold and a $340 \pm 15\,\text{g}$ tamper dropped 25 times from $5\,\text{mm}$ above the fine aggregate surface; slight slumping upon vertical removal of the mold confirms the saturated surface-dry (SSD) condition.

Pycnometer

A calibrated vessel, such as a $500\,\text{cm}^3$ volumetric flask with a pycnometer top, used in ASTM C128 to determine the volume, specific gravity, and absorption of fine aggregates.

Bulk Unit Weight (ASTM C29)

The mass of aggregate per unit volume of the bulk material ($M = \frac{G - T}{V}$), encompassing both the solid volume of individual particles and the volume of voids between particles.

Voids in Aggregate

The inter-particle space within a bulk unit volume of aggregate that is not occupied by solid mineral matter, calculated as $\left[\frac{(S \times W) - M}{S \times W}\right] \times 100$.

Aggregate Compaction Methods (ASTM C29)

Standardized methods to consolidate aggregate: rodding is used for aggregates with nominal maximum size $\le 37.5\,\text{mm}$, jigging is used for sizes from $37.5\,\text{mm}$ to $125\,\text{mm}$, and shoveling is used to determine loose bulk density.

Concrete Slump Test Procedure

A field and laboratory test (ASTM C143) measuring the consistency and workability of freshly mixed Portland cement concrete, executed in three layers tamped 25 times each and completed within $2.5\,\text{minutes}$.

Slump Mold

A rigid metal mold in the shape of a frustum of a cone with an open top diameter of $102\,\text{mm}$ ($4\,\text{in.}$), a bottom diameter of $203\,\text{mm}$ ($8\,\text{in.}$), and a height of $305\,\text{mm}$ ($12\,\text{in.}$).

Concrete Batching

The precise proportioning and measuring of concrete constituent materials—portland cement, water, fine aggregate, and coarse aggregate—either by weight or by volume prior to mixing.

Concrete Curing

The process of maintaining adequate moisture content and favorable temperature conditions in freshly placed concrete to allow continuous cement hydration and hardening over time.

Saturated Limewater Curing

A standard curing method where cylindrical concrete specimens are immersed in lime-saturated water at $23 \pm 1.7^\circ\text{C}$ to insulate specimens against temperature swings, prevent moisture loss, and avoid lime leaching.

Compressive Strength of Concrete ($f'_c$)

The capacity of a hardened concrete cylindrical specimen to withstand axial compressive loads, calculated as $f'_c = \frac{P_{\max}}{A}$ and used as the primary benchmark for concrete quality and structural design.

Concrete Cylinder Fracture Patterns (ASTM C39)

The six recognized fracture modes observed in crushed concrete cylinders: (1) cones on both ends, (2) cone on one end and vertical cracks, (3) vertical cracks, (4) diagonal fracture, (5) side fracture, and (6) side fractures with pointed ends.

Modulus of Rupture (MOR)

The flexural tensile strength of an unreinforced concrete beam resisting failure under bending moments, calculated as $R = \frac{PL}{bd^2}$ when fracture occurs within the middle third of the span.

Third-Point Loading Configuration (ASTM C78)

A beam testing apparatus setup that applies two equal vertical loads at the third points ($\frac{L}{3}$) of the span length, creating a central region of pure bending moment with zero shear force.

Gross Area Compressive Strength (Concrete Masonry)

The compressive strength of a concrete masonry unit determined by dividing the maximum compressive load ($P_{\max}$) by the total cross-sectional area bounded by external dimensions ($A_g = L \times W$).

Net Area Compressive Strength (Concrete Masonry)

The compressive strength of a concrete masonry unit determined by dividing the maximum compressive load ($P_{\max}$) by its net solid bearing area ($A_n = \frac{V_n}{H}$).

Net Volume of Masonry Units ($V_n$)

The solid volume of a concrete masonry unit determined via water displacement, calculated as $V_n = (W_s - W_i) \times 10^6\,\text{mm}^3$ from its saturated weight ($W_s$) and submerged weight ($W_i$).

Yield Strength (ASTM E8)

The stress level at which a metallic material transitions from elastic behavior to permanent plastic deformation, identified via the offset method, extension method, or an observed deformation spike.

Tensile Strength (Metallic Materials)

The maximum engineering tensile stress sustained by a metallic specimen during a uniaxial tensile test, calculated as $\sigma = \frac{P_{\max}}{A_o}$.

Modulus of Elasticity ($E$)

The ratio of tensile or compressive stress to the corresponding strain within the linear proportional limit of a material ($E = \frac{\sigma}{\varepsilon}$), representing material stiffness.

Percent Reduction in Cross-Sectional Area

A measure of ductility in tension testing determined by comparing the fractured neck area to the initial area: $\left[\frac{A_o - A_s}{A_o}\right] \times 100$.

Extensometer

A precision instrument containing a displacement sensor (such as an LVDT or dial gauge) clamped to a specimen to measure linear deformation within the gauge length during tensile testing.

Penetration Test of Asphalt Cement (ASTM D5)

A standardized consistency test evaluating the depth in units of $0.1\,\text{mm}$ to which a weighted needle ($100\,\text{g}$ total moving load) penetrates an asphalt specimen in $5\,\text{seconds}$ at $25^\circ\text{C}$.

Penetration Value

The numerical measurement of needle penetration into asphalt cement expressed in tenths of a millimeter; larger penetration values designate softer asphalt binder consistency.

Small, Clear Wood Specimens (ASTM D143)

Defect-free straight-grained wood specimens ($50 \times 50 \times 760\,\text{mm}$ primary or $25 \times 25 \times 410\,\text{mm}$ secondary) used to determine fundamental, comparative species mechanical properties.

Static Bending Failure Types in Wood

The standardized fracture patterns of timber in static bending: (a) simple tension, (b) cross-grain tension, (c) splintering tension, (d) brash tension, (e) compression, and (f) horizontal shear.

Fiber Stress at Proportional Limit ($S_f$)

The maximum extreme fiber stress developed in a timber beam loaded within its elastic proportional limit, calculated for center-point loading as $S_f = \frac{1.5 P' L}{b h^2}$.

Polymerization

The chemical reaction process in which small repeating monomer units link covalently to form high-molecular-weight macrocell polymer chains comprising plastic materials.

Type M-I Plastic Specimen (ASTM D638M)

A standardized dogbone-shaped specimen configuration having an overall length of $150\,\text{mm}$, gauge length of $50\,\text{mm}$, narrow section width of $10\,\text{mm}$, and thickness of $4\,\text{mm}$ used for plastic tensile testing.