Composition and early-age temperature regime in massive concrete foundation

Lam Van Tang,Chuc Trong Nguyen,Anh Ngoc Pham,Boris Bulgakov,V Andreev,A Ter-Martirosyan,A Adamtsevich,T Matseevich

doi:10.1051/matecconf/201819604017

Lam Van Tang, Chuc Trong Nguyen + Show 6 more

Open Access

https://doi.org/10.1051/matecconf/201819604017

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Abstract

The usage of monolithic concrete technology in massive structure construction has created a need for a more detailed design focused on crack control. In this study, the American standard ACI 211.1-09 and absolute volume method were used to determine the composition of heavy weight concrete for the high-rise building foundation. The concrete block temperature behavior has been analyzed by a three-dimensional thermal model in program Midas Civil. The conducted studies' result provided the possibility of obtaining heavy weight concrete from Vietnam local raw materials regarding to the concrete mixture workability of 16 cm standard cone, compressive strength of 42.3 MPa and average tensile strength of 3.5 MPa at the age of 28 days. According to the model analysis results, the maximum temperatures of the massive concrete foundation at the first (after 72 hours) and second pour (after 144 hours) from the beginning of construction are respectively 55.70C and 65.50C. In addition, the temperature differences at the core of each concrete pours with respect to the concrete outer portion, which induces a risk of through cracking in structure body or surface were determined.

Highlights

The rise of economic development and population in the urban areas lead to future increasing activity in residential high-rise construction and office buildings
The American standard ACI 211.109 and absolute volume method were used to determine the composition of heavy weight concrete for the high-rise building foundation
The conducted studies' result provided the possibility of obtaining heavy weight concrete from Vietnam local raw materials regarding to the concrete mixture workability of 16 cm standard cone, compressive strength of 42.3 MPa and average tensile strength of 3.5 MPa at the age of 28 days

Summary

Introduction

The rise of economic development and population in the urban areas lead to future increasing activity in residential high-rise construction and office buildings. Massive concrete foundations are taken down the temperature levels during the casting operation phase so as to avoid early-age cracking problems. According to [3,4,5], concrete early-age behavior has proven to be decisive with regard to massive concrete constructions as gravity dams, thick foundations, hydropower projects, piers, etc. Because of the large size of structures, the heat released during the cement hydration at an early age is difficult to redistribute from the inner layers to the outside. The considerable thermal gradients are results of low thermal conductivity of young concrete. These thermal gradients aggregated with external as well as internal restraint to volume changes induce stresses. In study [6], cracking happens in concrete block when the tensile stress becomes higher than that of concrete

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