Evaluation of the Quality of Concrete Structures by the …
According to [16], concrete made with aluminous cement has a value of compressive strength higher compared to concrete made with ordinary cement, which necessarily leads to high values of the index of rebound. ... In old concrete, the thickness of the carbonation surface can reach a few millimetres; in this case the values of the rebound ...
Typical U values of building construction methods and …
Wall (outer) 9" solid brick : 0.38: 2.2: 11" brick-block cavity - unfilled : 0.18: 1.0: 11" brick-block cavity - insulated : 0.10: 0.6 : Wall (internal) plaster, 4.5 ...
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The Hidden Dangers of Old Concrete: Why …
Old concrete is any existing concrete structure that has been exposed to the elements for an extended period (more than 30 years), often resulting in deterioration. This can be caused by natural erosion or frost and …
Performance of 90-year-old concrete in a historical structure
Taffe et al. [9] assessed a 45-year old prestressed concrete bridge using combined magnetization and a tractor appliance. Based on visual inspections, fractured prestressed steel, pitting corrosion, and delamination in the bridge deck were observed, and typical damage patterns, especially for the delamination in the bridge deck, also were seen.
Experimental investigation and peridynamic modelling on …
The bonding performance of the new-to-old concrete interface is influenced by several factors, which have been explored based on physical experiments [8], [9], [10].He et al. [11] investigated how interface roughness and bonding agents affect the interface characteristics. A strong correlation was revealed between interface roughness and the mechanical …
Study on freeze-thaw deterioration model of new-to-old concrete …
The ordinary Portland cement P.O42.5 with specific surface area of 345 m 2 /kg and density of 3.15 g/cm 3 (Shijiazhuang Quzhai cement Co., LTD) was used to prepare the old concrete, and the chemical composition is shown in Table 1. Alkali activated slag-fly ash (AASFA) as repairing materials were prepared using the slag classified as S95 and ...
Chemical, Physical, and Mechanical Properties of 95-Year …
The old concrete could be categorized as normal concrete according to the EN 206 standard, with a mean dry density value of 2175 ± 7 kg/m 3 (see Table 2). The average …
Concrete Prices 2025
Expect to pay $6.00 to $9.50 per square foot for materials and labor. Rising material, labor, and transportation costs have driven up concrete prices in recent years. Prices vary based on location and project specifics. Get quotes …
International Concrete Abstracts Portal
Cost and Value of Concrete Pavements. Document: JL05-25. Date: January 1, 1909. Author(s): J.H. Chubb. Publication: Journal Proceedings. Volume: 5. Issue: 1. Abstract: Concrete, one of the old est and most valuable of the materials of construction, has been used for years as the base of foundation for pavements having some form of brick, ...
Composition and Characteristics of 100-Year-Old …
In a groundbreaking examination of a century-old concrete sample, provided by Dr. Le Pham, a key contributor to the University of Wisconsin-Madison's concrete research project, researchers have uncovered …
Antique Bricks Identification and Value Guide
In order to find the value of the antique bricks, the following evaluation of the elements can assist a ... In order to increase the durability of bricks, clay bricks were later fired in kilns. While concrete blocks were first manufactured commercially during the early 20th century, they date back to ancient Greece and Rome. ... Your Old Value ...
Where to Recycle Old Concrete?
Thankfully, recycling concrete isn't just possible – it's an increasingly viable and sustainable practice. This article will delve into the intricacies of concrete recycling, exploring …
Size effect on tensile bonding strength between new and old concrete
Table 2 presents the mix proportion of the old concrete, with a water-cement ratio of 0.4 and a sand ratio of 36 %. The tensile strength of the 150 mm cubic old concrete specimens after 56 days was 3.84 MPa based on the splitting tensile test. Fig. 2 is the complete procedure for preparing old concrete specimens. The roughness templates were ...
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Recycling technology of old cement concrete pavement in …
Good resistance to wear, frost, fire, and explosion is necessary for cement base material used for the pavement of roads, highways, airport runways and other projects [1][2][3][4][5][6], however ...
Performance of 90-year-old concrete in a historical structure
In this study, the field evaluation of the old concrete in a historical reinforced concrete structure (a stadium) has been conducted using destructive and nondestructive …
A 95-Year-Old Concrete Arch Bridge: From Materials …
Before the reconstruction process of the 95-year-old concrete arch bridge (see Figure 2) a few fragments of the old concrete were delivered to a laboratory (see Figure 3 a) and seven concrete cores were extracted by means of a borehole diamond drill machine (see Figure 3 b). After finishing, the length-to-diameter ratio L/D was 1 (L = D = 100 mm; see EN 12504-1 [] …
Compressive Behavior of Recycled Concrete Aggregate …
For all strength development mark, the value of CS tends to decrease while the RCA Percent Replacement increases. At 50%PR, CS values are distant with one another responding to the AG variations ...
Methods for measuring pH in concrete: A …
Glass-fiber-reinforced polymer (GFRP) bars have been widely employed to enhance the durability of concrete structures (Benmokrane et al., 2018;Xian et al., 2022;Zhang et al., 2020) and are used as ...
International Concrete Abstracts Portal
Title: Alkali Contribution From Limestone Aggregate to Pore Solution of Old Concrete. Author(s): P. E. Grattan-Bellew. Publication: Materials Journal. Volume: 91. Issue: 2. ... Canada, were higher than the estimated original value. The structure was built 30 years ago, using a marginally expansive, alkali-silica-reactive, argillaceous limestone ...
Concrete Sink for sale
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How to Make Old Concrete Look Better | 9 Easy Ways (2025) …
Whether you're a novice DIYer or a seasoned pro, there's something for everyone in this post. So let's dive in and bring life back into your old concrete surfaces! 9 Best Ways on How to Make Old Concrete Look Better 1. Clean and Power Wash: The first step to improving the appearance of old concrete is to give it a thorough clean.
U values of typical building methods
U values (overall coefficient of heat transmission) indicate the heat flow through materials - the higher the figure, the higher the heat loss. While the values do vary for each particular material …
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Seismic Performance Capacities of Old Concrete
SEISMIC PERFORMANCE CAPACITIES OF OLD CONCRETE Vsevolod LEVTCHITCH1, Victor KVASHA2, Helen BOUSSALIS3, Anastasios CHASSIAKOS4 and Elias KOSMATOPOULOS5 ... Up to the stress of 75% of a peak value, old concrete behaves as an elastic material. All these changes in properties are on the alarmingly unsafe side in terms of seismic performance.
(PDF) pH Measurement of Cement-Based …
tested the solid-to-solvent ratio for 7-day-old normal-strength concrete (NSC-7) and 180- ... the effect of different filtering setups on the pH value of a cement mortar with a cement-to-sand ...
(PDF) Influence of Old Concrete Age, Interface Roughness and …
The bonding surface structure generated by the repair of concrete structures has been paid more attention as a weak point. The effects of old concrete age, interface roughness, and freeze-thawing ...
Shear performance of new-to-old concrete interface based …
The combination of new and existing concrete interfaces is prevalent in concrete structures [1], such as preparation joints in cast-in-place structures, seams in prefabricated structures, interfaces in reinforced structures, and composite interfaces in 3D printed concrete [2], [3], [4], [5].For instance, under external loads, the interface between new and old concrete in …
Evaluation and repair of 100-year-old concrete structures
Evaluation of historic concrete structures requires careful consideration of the material, detailing, and construction aspects as reinforced concrete technology was quickly …