High-strength concrete showed three to four times better performance against chloride penetration compared to normal strength concrete. Use of 10 percent silica fume further improved resistance against chloride penetration.
better resistance to penetration of chloride ions. In essence, the test method measures the conductivity of concrete. As originally developed, the intent was to establish a correla-tion of the charge passed measured by ASTM C with the depth of chloride penetration in the chloride ponding test (AASHTO T ; ASTM C). The conductivity of.
RESEARCh ON ChLORIDE PENEtRAtION RESIStANCE Of PhOSPhOALUmINAtE CEmENt CONCREtE The smaller the w/c is, the smaller the chloride diffusion coefficient of PAC concrete will be, which resistance, the resistance. penetration.
Surface Resistivity Indication of Concrete's Ability to Resist Chloride Ion Penetration. AASHTO Designation: T XXX 1. SCOPE. This test method covers the determination of the electrical resistivity of concrete to provide a rapid indication of its resistance to the penetration of chloride ions.
and prestressed concrete structures is thus highly dependent on the resistance of concrete to chloride penetration. The physical resistance of concrete to chloride penetration is influenced by factors relating to the concrete itself, such as the porosity of concrete and interconnectivity.
A large number of prior researchers have investigated the chloride penetration into reinforced concrete; in addition, numerous models to predict transport properties and service life have been introduced. However, it has a disadvantage that all simulations are conducted with the pure concrete or uncracked concrete. The primary focus of this study was to examine the effect of fly ash addition on Portland cement as well as blast furnace slag cement concrete resistance to chloride ion penetration.
The resistance to chloride ion penetration is used, because, as mentioned earlier, chloride ingress is the most common cause of reinforcing steel corrosion. Other performance requirements can be specified, such as scaling resistance, strength, and freeze/thaw durability. Rapid index test methods included were rapid chloride permeability, rapid migration, conductivity, absorption, and initial and secondary sorptivity. A set of rapid index test methods and specification criteria that can reliably classify mixtures based on their resistance to chloride ion penetration are proposed.
impenetrable concrete. Therefore, the resistance to penetration of chloride ions into concrete must be known for design as well as quality control purposes and, in order to assess this resistance to chloride penetration, test methods are needed to allow the determination of representative values in a reasonable time.
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