HMA Performance Tests Performance tests are used to relate laboratory mix design to actual field performance. The Hveem ( stabilometer) and Marshall (stability and flow) mix design methods use only one or two basic performance tests. Superpave is intended to use a better and more fundamental performance test.
What are the different types of performance tests used in HMA?
HMA Performance Tests 1 Permanent Deformation (Rutting) Static creep tests . Apply a static load to a sample and measure how it recovers when the load is removed. 2 Fatigue Life. ... 3 Tensile Strength. ... 4 Stiffness Tests. ... 5 Moisture Susceptibility. ...
What is a flexural test for HMA?
The flexural test determines the fatigue life of a small HMA beam specimen (380 mm long x 50 mm thick x 63 mm wide) by subjecting it to repeated flexural bending until failure (see Figure 14). The beam specimen is sawed from either laboratory or field compacted HMA.
What is HMA pavement?
Pavement Interactive focuses on dense-graded HMA because it is the most common HMA pavement material in the U.S. The three most common types of HMA pavement are: Dense-graded HMA.
What are the key performance parameters of HMA?
Deformation resistance (rutting) . A key performance parameter that can depend largely on HMA mix design. Therefore, most performance test efforts are concentrated on deformation resistance prediction. Fatigue life . A key performance parameter that depends more on structural design and subgrade support than mix design.
What is the asphalt test?
Asphalt materials testing includes roofing and viscosity grading and asphalt binder testing. Asphalt cargo inspection services are available on a global basis.
What is Dynamic Modulus test?
The dynamic modulus represents the stiffness of the asphalt material when tested in a compressive-type, repeated load test. The dynamic modulus is one of the key parameters used to evaluate both rutting and fatigue cracking distress predictions in the MEPDG.
What is HMA mixture?
Abstract. Hot-mix asphalt (HMA) mixtures consist of three phases: aggregate, asphalt binder (mastic) and air voids, of which the first two (aggregate and asphalt binder) provide the structure that withstands various kinds of loading.
What is moisture susceptibility test?
Moisture damage is typically addressed with laboratory tests as a part of the mixture design process where the main point of the test is to determine the potential for the material to experience moisture related damage, known as moisture susceptibility.
What is static modulus?
'Static moduli', on the other hand, refers to the elastic stiffness that relates deformation to applied stress in a quasi-static loading situation, that is the slope of the stress– strain curve.
What is indirect tensile test?
Indirect tensile strength test is an indicator of strength and adherence against fatigue, temperature cracking and rutting. Tensile strength is difficult to measure directly because of secondary stresses induced by gripping a specimen so that it may be pulled apart.
What is HMA type A?
Type A hot mix requires that at least 90% of the coarse aggregate and 70% of Fine aggregate used contains crushed particles while Type B hot mix only requires 25% and 20% respectively.
What is HMA overlay?
Hot Mix Asphalt (HMA) Overlay involves a composition of asphalt concrete and aggregate. It is used to treat poor pavement conditions when Slurry Seal, Microsurfacing, or Cape Seal treatments are not suitable. The overlay provides a restored surface which is smooth and can withstand heavy traffic.
What is HMA binder?
Definition of HMA. In simple terms…: A mixture of asphalt binder and. graded mineral aggregate, mixed at. an elevated temperature and.
What is TSR in asphalt?
The TSR is the indirect tensile strength of freeze–thaw-conditioned specimen divided the indirect tensile strength of unconditioned sample at 60°C. The higher the values of MSR and TSR are, the more resistant to moisture damage the asphalt mixture is. Fig.
How do you calculate tensile strength ratio?
6.1 Calculate the Tensile Strength Ratio (TSR). TSR = N x 100 P Where: N = average indirect tensile strength of wet conditioned specimens. P = average indirect tensile strength of dry specimens.
What is HAMA in medicine?
Human Anti-mouse Antibody (HAMA) - The presence of Human Anti-mouse Antibody (HAMA) has been associated with patients receiving injections of Murine Monoclonal Antibody (MAB) for diagnostics and/or therapeutic purposes . HAMA produced in response to monoclonal antibody therapy may interfere with therapeutic efficacy. Therefore, it is recommended that baseline HAMA levels are determined prior to the initiation of therapy with murine-derived proteins.
Does monoclonal antibody therapy interfere with HAMA?
HAMA produced in response to monoclonal antibody therapy may interfere with therapeutic efficacy. Therefore, it is recommended that baseline HAMA levels are determined prior to the initiation of therapy with murine-derived proteins.
What is HOMA IR?
What is HOMA-IR? Insulin resistance not only paves the way for type 2 diabetes but also other diseases like hypertension, dyslipidemia, cardiovascular disease and cancer. Strangely enough, people with normal levels of blood sugar may be insulin resistant. And this is exactly where HOMA IR can help.
What does a low HOMA IR mean?
Low HOMA-IR implies you are sensitive to insulin and higher levels indicate insulin resistance and higher chances of you developing diabetes mellitus.
Can a HOMA IR test predict diabetes?
HOMA-IR Test – A Test That Can Predict Diabetes – Know More ! Click to rate this post! The very mention of diabetes can strike fear in the heart of the bravest. It is known to adversely affect several organs in the body like the eyes, kidneys, nerves, heart and many more. If not diagnosed on time and treated, it can lead to several complications.
Can a HOMA IR test detect blood sugar?
This is how the HOMA-IR goes a step further than a normal blood sugar test, which can only monitor your sugar level and would not be able to detect if anything is wrong until high blood sugar sets in.
Does HOMA IR ring the bells?
HOMA IR, on the other hand, will ring the warning bells as soon as it registers even the slightest resistance to insulin in the pre-diabetes stage so that you can take the necessary steps to prevent a full-blown attack of diabetes.
What is the most common type of HMA?
The three most common types of HMA pavement are: Dense-graded HMA. Flexible pavement information in this Guide is generally concerned with dense-graded HMA. Dense-graded HMA is a versatile, all-around mix making it the most common and well-understood mix type in the U.S. Stone matrix asphalt (SMA).
Why is HMA pavement considered flexible?
HMA Pavement. HMA pavements are classified as “flexible” pavements because the total pavement structure deflects, or flexes, under loading. A flexible pavement structure is typically composed of several layers of material. Each layer receives the loads from the above layer, spreads them out, then passes on these loads to the next layer below.
What is HVA measurement?
HVA measurement is also useful to diagnose children with disorders of catecholamine metabolism such as monoamine oxidase-A deficiency and dopamine beta-hydroxylase deficiency , which results in either decreased or elevated urinary HVA values, respectively.
What is HVA in urine?
Homovanillic acid ( HVA) measurement in urine is used for screening children for catecholamine-secreting tumors such as neuroblastoma, pheochromocytoma, and other neural crest tumors and monitoring those who have had treatment for these tumors.
Everything all in one place with HMA
Members, set up your HMA account so you can access tools and resources to help you manage your health and your health benefits. On the HMA member portal, you can:
Access the largest healthcare provider network in the Pacific Northwest
With the largest healthcare provider network in the Pacific Northwest, chances are, your doctor is already in our network.
