The structure of air entrainment of cement concrete by means of protein formulation and modern factory produced admixture

1Comparison of the compressive strength of concrete samples (fcm) Figures: Zielinski, Knast
1
Comparison of the compressive strength of concrete samples (fcm)
Figures: Zielinski, Knast
2-4 The look of concrete samples with the increasing content of protein formulation (from 0 to 3‰) Figures: Zielinski, Knast
2-4
The look of concrete samples with the increasing content of protein formulation (from 0 to 3‰)
Figures: Zielinski, Knast
Figures: Zielinski, Knast
Figures: Zielinski, Knast
Figures: Zielinski, Knast
Figures: Zielinski, Knast
5-7The look of concrete samples with the increasing content of the factory produced air-entraining admixture (from 0 to 5‰) Figures: Zielinski, Knast
5-7
The look of concrete samples with the increasing content of the factory produced air-entraining admixture (from 0 to 5‰)
Figures: Zielinski, Knast
Figures: Zielinski, Knast
Figures: Zielinski, Knast
Figures: Zielinski, Knast
Figures: Zielinski, Knast
8Distribution of air voids in concrete samples, determined by a microscopic method according to [5], contained in the tested cement mortar samples with protein ­formulation admixture (on the left) and ­factory produced air entraining admixture (on the right) Figures: Zielinski, Knast
8
Distribution of air voids in concrete samples, determined by a microscopic method according to [5], contained in the tested cement mortar samples with protein ­formulation admixture (on the left) and ­factory produced air entraining admixture (on the right)
Figures: Zielinski, Knast
9 Comparison of air volume contained in concrete mixes prepared for tests. The maximum admissible dosage recommended by the manufacturer for the admixture is 8 ‰. It is rarely used in practice and it is probably due to the upper limit of possible air entrainment of concrete mix defined by the producer Figures: Zielinski, Knast
9
Comparison of air volume contained in concrete mixes prepared for tests. The maximum admissible dosage recommended by the manufacturer for the admixture is 8 ‰. It is rarely used in practice and it is probably due to the upper limit of possible air entrainment of concrete mix defined by the producer
Figures: Zielinski, Knast
10 Comparison of micro­pores A300 contained in concrete samples Figures: Zielinski, Knast
10
Comparison of micro­pores A300 contained in concrete samples
Figures: Zielinski, Knast
11 Comparison of the specific surface area α of air voids contained in concrete samples Figures: Zielinski, Knast
11
Comparison of the specific surface area α of air voids contained in concrete samples
Figures: Zielinski, Knast
12 Comparison of the distribution ratio of air voids contained in the concrete samples L− Figures: Zielinski, Knast
12
Comparison of the distribution ratio of air voids contained in the concrete samples L−
Figures: Zielinski, Knast

The paper compares the impact of blood admixture and a classic air entraining factory produced admixture on the structure of air entrainment of cement concrete. The results show that the protein formulation is in no way inferior to the performance of a modern air entraining admixture, in terms of efficiency, intensity of action and air entrainment characteristics.

The importance of air entraining admixtures for the quality and durability of concrete were already appreciated as long ago as in antiquity. It was then that people observed that blood added to a concrete mix had a positive impact on the durability of concrete. The experiences of ancient civilizations were also used in more recent time. In 1805 Thomas Telford used mortar containing ox blood to erect stone pillars during the construction of the Pontcysyllte aqueduct in North East Wales [1].

An interesting reference can also be found in the novel by a Cuban writer Alejo Carpentier entitled The...

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BFT 03/2017

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BFT 03/2017

Ressort:  CONCRETE TECHNOLOGY | BETONTECHNOLOGIE
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