Advances in materials Research

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Effects of silica fume, superplasticizer dosage and type of superplasticizer on the properties of normal and self-compacting concrete

  • Mazloom, Moosa (Department of Civil Engineering, Shahid Rajaee Teacher Training University) ;
  • Soltani, Abolfazl (Department of Civil Engineering, Shahid Rajaee Teacher Training University) ;
  • Karamloo, Mohammad (Department of Civil Engineering, Shahid Rajaee Teacher Training University) ;
  • Hassanloo, Ahmad (Department of Civil Engineering, Shahid Rajaee Teacher Training University) ;
  • Ranjbar, Asadollah (Department of Civil Engineering, Shahid Rajaee Teacher Training University)
  • Received : 2018.06.12
  • Accepted : 2018.08.08
  • Published : 2018.03.25
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Abstract

In the present study, a special attention has been paid to the effects regarding the use of different superplasticizers in different dosages. To do so, 36 mixes of normal and self-compacting concrete with two water/binder ratios of 0.35 and 0.45, four different types of superplasticizer including melamine-formaldehyde, naphthalene-formaldehyde, carboxylic-ether and poly-carboxylate, four different superplasticizer/cement ratios of 0.4%, 0.8%, 1.2% and 1.6% and two silica fume/cement ratios of 0% and 10% have been cast. Moreover, the initial and final setting time of the pastes have been tested. For self-compacting mixes, flow time, slump flow, V-funnel, J-ring and L-box tests have been carried out as well as testing the compressive strength and rupture modulus. For normal concrete mixes,slump test has been conducted to assess the workability of the mix and then for each mix, the compressive strength and rupture modulus have been determined. The results indicate that in addition to the important role of superplasticizer type and dosage on fresh state properties of concrete, these parameters as well as the use of silica fume could affect the hardened state properties of the mixes. For instance, the mixes whose superplasticizer were poly-carboxylic-ether based showed better compressive and tensile strength than other mixes. Besides, the air contents showed robust dependency to the type of the superplasticizer. However, the use of silica fume decreased the air contents of the mixes.

Keywords

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