Self-compacting concrete for massive structural elements

Figures: W. Hermerschmidt

Development of mechanical properties (compressive strength f_cc, direct strength f_ct, and modulus of elasticity E_c)

Figures: W. Hermerschmidt

Figure: I. Marquardt

Steadily rising concrete level in the test wall

Figure: I. Marquardt

Figures: I. Marquardt

Preparation of the reinforced test plate and pouring of the self-compacting concrete

Figures: I. Marquardt

Figure: I. Marquardt

Demolded test wall

Figure: I. Marquardt

Saw-cut tests without signs of segregation

Figure: I. Marquardt

Figure: W. Hermerschmidt

Adiabatic concrete calorimeter (schematic sketch)

Figure: W. Hermerschmidt

Comparing the temperature development of the SCC developed with that of an ordinary concrete produced using Portland cement, measured in the adiabatic concrete calorimeter

Figure: W. Hermerschmidt

Temperature development in the component measured at different points and compared with numerically predicted temperature profiles

Figure: W. Hermerschmidt

Calculated temperature development in the structural element for SCC (left) and ordinary concrete with Portland cement (right) at different element thicknesses

Figure: W. Hermerschmidt

Influence of internal pipe cooling on the maximum temperature in the component

Figure: W. Hermerschmidt

A number of specific requirements needs to be considered when producing massive structural components by using from self-compacting concrete. The research conducted on the development of hydration heat and presented below shows that, with the right choice and combination of raw materials, appropriate concrete can also be produced at high binder contents.

1 Introduction

The heat of hydration released during the cement hardening reaction can result in a significant increase in temperature especially in massive concrete elements. The thermal stresses occurring as a result of the discharged heat of hydration can lead to cracking when exceeding the developing tensile strength of the concrete. The production of massive structures represents a challenge especially in terms of keeping the temperature differences between the core and surface of the concrete element low enough to prevent damage caused by external and internal restraint while at the same...