The Effect of Aggregate Shape on the Properties of Concretes with Silica Fume

Abstract

The paper examines the impact of aggregate shape on the compressive strength and thermal properties of concretes with silica fume based on two different aggregates: natural round gravel aggregate and crushed basalt aggregate. Compressive strength and thermal properties of individual concretes were determined during the first year of specimens curing. Additionally, porosity tests were conducted using mercury intrusion porosimetry and optical porosimetry. Mercury porosimetry tests showed that the use of silica fume led to a decrease in the content of pores of size smaller than 0.15 µm compared to the reference concretes without the addition of silica fume. However, tests carried out on crushed basalt-based concrete showed the presence of numerous additional pores with diameters ranging from 0.05 to 300 μm. In case of natural round gravel aggregate-based concrete, the addition of silica fume brought about an increase in its compressive strength. In turn, basalt-based concrete exhibited notably lower compressive strength values due to significantly higher porosity within the range of more than 70 μm. In basalt concrete, the obtained λ values are much lower than in concretes with normal gravel aggregate. In addition, the specific porosity structure had its impact on the process of drying of specimens of each group which occurred at a significantly faster rate in the basalt-based concrete. In conclusion, it can be stated that the use of crushed basalt aggregate causes a significant aeration of concrete, even despite the use of silica fume. As a result, the concrete based on crushed aggregate is characterized by a definitely lower compressive strength, but also better thermal insulation properties compared to analogous concrete made on natural round gravel aggregate.

Concrete characteristics using aggregate from Nanga Jemah Village, Kapuas Hulu District for rabat beton road

“…Research methods are arranged in such a way as to facilitate the implementation of research so that it runs more appropriately, effectively, and efficiently (Hariyani, 2009;Mc Nei & Kang, 2013;Ministry of Public Works, 2007;Mindeguia et al, 2012;Papayianni & Anastasiou, 2012) Based on the 4 variations, then made a test object in the shape of a cylinder with a diameter of 15 cm and a height of 30 cm with a range of 30 MPa for test objects aged 3 days, 7 days, and 14 days. c) Examination of Concrete Characteristics After making the test object with 4 formulas and the same mixture and with the same concrete strength, then test the compressive strength of the concrete and the tensile strength of the concrete (Silva et al, 2014;Strzałkowski, & Garbalińska, 2020;Tjokrodimuljo, 1996;Toklu & Yazıcıoğlu, 2020). d) Furthermore, from the results obtained from the above characteristic values, the analysis of the concrete mix for Rabat Beton road was performed.…”

“…Rasiwan, R., Syahrani, D., Supardi, I., Rabihati, E., Abduh, M., & Haryani, S. (2022) From figure 2, we can see the relationship between variations, which shows the tensile strength and age of concrete from the picture above. The maximum tensile strength is 8.2336 MPa for variation 2 for 3 days while the minimum compressive strength is at variation 1 for 3 days of age with a compressive force of 3,118 MPa (Strzałkowski, & Garbalińska, 2020;Tjokrodimuljo, 1996;Toklu & Yazıcıoğlu, 2020;Zaharieva et al, 2004 Zaharieva et al, 2004;Zhang et al, 2018;Zhao et al, 2015;Nurkertamanda et al, 2017) 4 Conclusion…”

The Effects of Temperature Curing on the Strength Development, Transport Properties, and Freeze-Thaw Resistance of Blast Furnace Slag Cement Mortars Modified with Nanosilica

“…Mercury intrusion porosimetry (MIP) was applied in order to assess the pore characteristics of the cement mortars. This is a common method widely used to characterize the pore structure of porous materials, including the cement-based and geopolymer composites used in construction [ 48 , 49 ]. Due to its simplicity, quickness, and wide pore diameter measuring range, it can be used as an indicator for understanding the durability related parameters of composites, including transport properties and freeze-thaw resistance [ 49 ].…”

Rheological, Mechanical, Microstructural and Radiation Shielding Properties of Cement Pastes Containing Magnetite (Fe3O4) Nanoparticles

“…The porosities of NM5, NM10, NM15, NM20, and NM30 were 11%, 25%, 28%, 25%, and 38% higher than the value reported for the NM0 paste, respectively. It is widely agreed that porosity is a critical cement matrix characteristic affecting the strength and durability of cementbased materials (Strzałkowski & Garbalińska 2020). Therefore, the observed alteration in porosities resulting from the cement replacement with Fe 3 O 4 NPs, is in good correlation with the compressive strength values ("Compressive strength").…”