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International Concrete Abstracts Portal

Showing 1-5 of 20 Abstracts search results

Document: 

SP-330-15

Date: 

September 26, 2018

Author(s):

Wen Zhou, Yongxiang Zhou, Peng Feng, Zuqi Wang, Jing Wang, and Putao Song

Publication:

Symposium Papers

Volume:

330

Abstract:

Preparing concrete with coral gravel and coral sand as aggregates is of great significance for the construction of offshore islands short of building materials. LC30 and LC50 coral aggregate concrete (CAC) using aggregate from South China Sea were prepared and basic properties of CAC were studied and compared with ordinary concrete (OC) and lightweight aggregate concrete (LAC). The results show that prewetting aggregates improves the compressive strength of CAC with low water-cement ratio (w/c). With the same level of cube compressive strength (fcu), the compressive strength (fc) of CAC is higher than that of OC and LAC, the splitting tensile strength (fsp) of CAC is close to that of OC and higher than that of LAC, the elastic modulus (Ec) of CAC is between that of OC and LAC. Test results on durability properties show that 3-day shrinkage of CAC is 43% of OC; and CAC’s ability to resist chloride diffusion is inferior to OC but better than LAC.

DOI:

10.14359/51711249


Document: 

SP-330-17

Date: 

September 26, 2018

Author(s):

Dongmin Wang and Dawang Zhang

Publication:

Symposium Papers

Volume:

330

Abstract:

This work aims to investigate the buildability of geopolymer printing materials with silicon-to-aluminum (Si/Al) from 4.5-5.5 were prepared by addition different content of steel slag into printing materials matrix. Effects of Si/Al on the buildability of geopolymer printing were investigated by open time and rheology of fresh pastes. The results show that Si/Al ratios cause the change of buildability. Higher Si/Al of geopolymer printing materials is beneficial to buildability: longer open time, lower plastic viscosity, higher yield stress, and great thixotropic guaranteed the continuity and stability of structure in the printing system.

DOI:

10.14359/51711251


Document: 

SP326-01

Date: 

August 10, 2018

Author(s):

N. Banthia, O. Onuaguluchi, and D. Cui

Publication:

Symposium Papers

Volume:

326

Abstract:

One very effective way of enhancing durability of concrete is by refining the microstructure using internal curing. This paper will describe some novel insights into providing internal curing in concrete using inexpensive and recycled engineered cellulose fiber (CF). Such bio-inspired materials also provide self-healing and reduce the continual need for repair and intervention. This study investigates the effect of 0 kWh/t, 100 kWh/t and 185 kWh/t degree of cellulose pulp refinement on fiber morphology, fiber water retention and desorption and fresh and hardened properties of cement composites containing these fibers as internal curing agents. 3-D Dual Scan Computer Tomography (CT) was also used to understand the refinement due to CF addition. It was concluded that CF addition resulted in a higher degree of hydration, pore refinement and interface densification. Results also show that CF can be further refined mechanical to increase the surface fibrillation and this may result in significant further improvement in the internal curing performance.

DOI:

10.14359/51710971


Document: 

SP321-06

Date: 

September 29, 2017

Author(s):

Aikaterini S. Genikomsou and Maria A. Polak

Publication:

Symposium Papers

Volume:

321

Abstract:

Three-dimensional (3-D) finite element analysis (FEA) is considered to examine previously tested and analyzed under static loading reinforced concrete slabs using the FEA software ABAQUS. Four interior reinforced concrete slab-column connections are presented; one slab is without shear reinforcement (SB1) and the other slabs are with shear bolts (SB2, SB3 and SB4) which differ in the amount of the shear bolts. The coupled plasticity damaged model previously calibrated is considered for modeling the concrete. In this research, parametric studies are presented considering different amount and placement of the shear bolts. The adopted FEA model is used to analyze and investigate the failure modes and loads and the crack patterns of the shear reinforced slab-column connections. Finally, the numerical results obtained from the parametric studies are compared to the current design code predictions.

DOI:

10.14359/51701193


Document: 

SP-315_06

Date: 

April 1, 2017

Author(s):

Aikaterini S. Genikomsou, Maria A. Polak

Publication:

Symposium Papers

Volume:

315

Abstract:

Punching shear failure of reinforced concrete slabs has been examined by many researchers through laboratory experiments. However, the existing punching shear testing database cannot address all aspects of the punching shear stress transfer mechanism. Advanced 3-D finite element analysis (FEA) can be used to supplement the existing testing background and for parametric investigations. In this way, different aspects of punching shear failure may be explored in detail, to enable understanding of the phenomena that control the response and to support drafting design code requirements. This paper describes research on calibrating constitutive and finite element models in ABAQUS to capture punching shear behavior of concrete slabs. The coupled damaged-plasticity model is used for modeling the concrete. Two interior reinforced concrete slab-column connections previously tested under static loading are presented: one slab is without shear reinforcement (SB1) and the other slab is with shear bolts (SB4). The developed formulation is calibrated using the results for specimen SB1, where the tension stiffening response, the damage parameters and the support conditions are examined. Then, the adopted FEA and concrete model are used for the analysis of slab SB4, which was retrofitted with shear bolts. Finally, both test and numerical results are compared to the ACI 318-14 provisions.


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