Investigating the Effects of Cement Type and W/C Ratio on the Concrete Corrosion Using the Electrical Resistance Assessment Method

Today, concrete is known as the most widespread material in civil projects. Up to now, many research works have been conducted concerning determination of concrete durability using various methods including the measurement of electrical resistance in concrete. The present article is an attempt for application of a new method for measurement of electrical resistance of non-conductive materials which is well suited for concrete. To determine the effects of cement type and water to cement ratio on the corrosion phenomenon the electrical resistance method was used. For this purpose use was made of 7 different water to cement ratios and two types of cement (type 2 and type 5). Drawing the electrical resistance diagrams, it was shown that with increase in the water to cement ratio, corrosion rate increases in concrete. Also application of type 5 cement results in a higher strength resistance with respect to cement type 2. On the other hand by increase in the age of concrete specimens, they showed greater resistance to the corrosion attacks.

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Durability of concrete containing chloride-based accelerating admixtures

Canadian Journal of Civil Engineering ◽

10.1139/l90-013 ◽

1990 ◽

Vol 17 (1) ◽

pp. 102-112

Author(s):

T. Rezansoff ◽

D. Stott

Keyword(s):

Calcium Chloride ◽

Dynamic Modulus ◽

Linseed Oil ◽

Standard Test ◽

Test Method ◽

Concrete Durability ◽

Freezing And Thawing ◽

Cement Ratio ◽

Freeze Thaw ◽

Water To Cement Ratio

The influence of CaCl2 or a chloride-based accelerating admixture on the freeze–thaw resistance of concrete was evaluated. Three air entrained mix designs were investigated using ASTM C666-84, Standard Test Method for Resistance of Concrete to Rapid Freezing and Thawing. All mix designs were similar, using cement contents of 340–357 kg/m3 of concrete, except for the addition of either 2% calcium chloride or 2% High Early Pozzolith, while no accelerating admixture was added to the control mix. The entire test program was repeated four times with water-to-cement ratio of 0.46 and three times with the ratio of 0.43. For the Pozzolith-accelerated concrete, half the samples were coated with boiled linseed oil in all seven series. For the control (unaccelerated) concrete, half the samples were coated with boiled linseed oil in one series for each water-to-cement ratio. Performance was monitored using the dynamic modulus of elasticity as obtained from transverse resonant frequency measurements. Weight loss of the specimens was also measured. Only the control samples (no accelerators) showed sufficient durability to satisfy the standard of maintaining at least 60% of the original dynamic modulus after 300 cycles of alternate freezing and thawing. Sealing with linseed oil showed inconsistent improvement in the durability in the various test series when defined in terms of the dynamic modulus; however, weight losses were the lowest of all categories and surface scaling was minimal. Key words: concrete, durability, freeze–thaw testing, calcium chloride, admixtures, sealants, air void system.

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Effects of Cement Type and Water to Cement Ratio on Concrete Expansion Caused by Sulfate Attack

Structural Engineering, Mechanics and Computation ◽

10.1016/b978-008043948-8/50181-8 ◽

2001 ◽

pp. 1607-1613 ◽

Cited By ~ 2

Author(s):

Seb J. Ficcadenti

Keyword(s):

Sulfate Attack ◽

Cement Type ◽

Cement Ratio ◽

Water To Cement Ratio

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An acousto-ultrasonic approach for the determination of water-to-cement ratio in concrete

Cement and Concrete Research ◽

10.1016/s0008-8846(02)00999-7 ◽

2003 ◽

Vol 33 (4) ◽

pp. 525-538 ◽

Cited By ~ 33

Author(s):

T.P Philippidis ◽

D.G Aggelis

Keyword(s):

Cement Ratio ◽

Water To Cement Ratio

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The Determination Of Diffusive Tortuosity In Concrete Specimens Using X-Ray Microtomography

Archives of Metallurgy and Materials ◽

10.1515/amm-2015-0140 ◽

2015 ◽

Vol 60 (2) ◽

pp. 1115-1119 ◽

Cited By ~ 9

Author(s):

Z. Ranachowski ◽

D. Jóźwiak-Niedźwiedzka ◽

P. Ranachowski ◽

M. Dąbrowski ◽

S. Kudela ◽

...

Keyword(s):

Random Walk ◽

Three Dimensional ◽

Micro Ct ◽

Connectivity Analysis ◽

Pore Connectivity ◽

Cement Ratio ◽

X Ray ◽

Water To Cement Ratio ◽

Random Walk Simulation

Abstract The paper presents a method of pore connectivity analysis applied to specimens of cement based composites differing in water to cement ratio. The method employed X-ray microtomography (micro-CT). Microtomography supplied digitized three-dimensional radiographs of small concrete specimens. The data derived from the radiographs were applied as an input into the application based on the algorithm called ‘random walk simulation’. As the result a parameter called diffusive tortuosity was established and compared with estimated porosity of examined specimens.

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