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Shrinkage and fracture properties of semi flowable self consolidating concrete

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The use of MK and SF as mineral additives caused a decrease in fracture energies of concretes, and this effect is more pronounced in SF blended concretes, while no significant change was observed in the compressive strength developments of the mixtures. CH consumption was found to be slightly higher in the pastes containing MK compared to those with SF. Compressive strength, splitting tensile strength, and critical stress intensity factor of SFSCCs are comparable to those of conventional pavement concrete, but elastic modulus of SFSCCs is lower than that of conventional pavement concrete. With a higher shrinkage stress-to-fracture strength ratio, SFSCC mixes have higher potential for shrinkage-induced cracking than conventional pavement concrete. In the study, prism tests were employed to evaluate concrete free shrinkage behavior. The effectiveness of MK and SF on the autogenous shrinkage, calcium hydroxide CH consumption, flowability, mechanical properties and fracture behavior of SCC was examined. Abstract Partial replacement of cement by metakaolin MK increases the strength of concrete, but since the properties of MK are important parameters it is not entirely clear whether MK is more effective than silica fume SF in enhancing the properties of concrete. Compressive strength, splitting tensile strength, elastic modulus, and notched beam fracture properties of the concretes were tested at 1, 3, 7, 14, and 28 days. It was shown that both MK and SF had an increasing effect on autogenous shrinkage of paste with 0. In addition, unrestrained ring tests were conducted and compared with the restrained ring tests. In addition, the performances of these two types of mineral additives in fiber reinforced concrete under four-point bending were documented. The results indicate that the rates of shrinkage of SFSCCs are generally higher than those of conventional pavement concrete. Previous article in issue. In order to provide a meaningful comparison, the pozzolans with similar particle sizes were used. The use of a clay additive, purified magnesium alumino silicate, further increases the rate of SFSCC shrinkage. Restrained ring tests were performed to assess concrete cracking potential.

Shrinkage and fracture properties of semi flowable self consolidating concrete


Previous article in issue. The effectiveness of MK and SF on the autogenous shrinkage, calcium hydroxide CH consumption, flowability, mechanical properties and fracture behavior of SCC was examined. The use of MK and SF as mineral additives caused a decrease in fracture energies of concretes, and this effect is more pronounced in SF blended concretes, while no significant change was observed in the compressive strength developments of the mixtures. Abstract Partial replacement of cement by metakaolin MK increases the strength of concrete, but since the properties of MK are important parameters it is not entirely clear whether MK is more effective than silica fume SF in enhancing the properties of concrete. In order to provide a meaningful comparison, the pozzolans with similar particle sizes were used. In the study, prism tests were employed to evaluate concrete free shrinkage behavior. Compressive strength, splitting tensile strength, elastic modulus, and notched beam fracture properties of the concretes were tested at 1, 3, 7, 14, and 28 days. In addition, unrestrained ring tests were conducted and compared with the restrained ring tests. In addition, the performances of these two types of mineral additives in fiber reinforced concrete under four-point bending were documented. With a higher shrinkage stress-to-fracture strength ratio, SFSCC mixes have higher potential for shrinkage-induced cracking than conventional pavement concrete. Compressive strength, splitting tensile strength, and critical stress intensity factor of SFSCCs are comparable to those of conventional pavement concrete, but elastic modulus of SFSCCs is lower than that of conventional pavement concrete. Restrained ring tests were performed to assess concrete cracking potential. The results indicate that the rates of shrinkage of SFSCCs are generally higher than those of conventional pavement concrete. The use of a clay additive, purified magnesium alumino silicate, further increases the rate of SFSCC shrinkage. It was shown that both MK and SF had an increasing effect on autogenous shrinkage of paste with 0. CH consumption was found to be slightly higher in the pastes containing MK compared to those with SF.

Shrinkage and fracture properties of semi flowable self consolidating concrete


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