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About 10,000 papers for “Compressive strength”

Compressive strength.

Xiaoqi Wang (164823), Heng Ma (240045), Xiaohan Qi (12107098) et al. · Figshare · 2022

Cited by 0Open access

Compressive strength.

Yongkang Du (21696255), Bitao Zhang (14097297), Dong Liu (115204) et al. · Figshare · 2025

<div> In this study, a novel nanomaterial early strength agent, CSH nano-crystal nucleus (NCSH), was used to compare with the conventional early strength agent, sodium sulfate (Na<sub>2</sub>SO<sub>4</sub>), to deal with the problem of insufficient early strength development of high volume fly ash concrete. The effects of NCSH, Na<sub>2</sub>SO<sub>4</sub>, and their combined action on the strength development, water absorption performance, and durability performance (impermeability, frost resistance, and carbonation) were investigated. The research results show that: the maximum strength of the concrete with Na<sub>2</sub>SO<sub>4</sub> was only 12.9 MPa at 12 hours, which could not meet the requirement of demoulding. At 28 days, the strength had significantly decreased, and the larger the dosage, the more it had decreased. Using NCSH or a mix of NCSH and Na<sub>2</sub>SO<sub>4</sub> allowed the concrete to attain the necessary strength for demoulding at 12 hours, and none of them showed any reduction at 28 days. The concrete durability test results show that: Na<sub>2</sub>SO<sub>4</sub> decreased the impermeability, frost resistance and carbonation resistance of concrete, while NCSH improved above properties of concrete significantly, and the improvement of frost resistance and carbonation resistance when combined Na<sub>2</sub>SO<sub>4</sub> and NCSH was not as good as that of NCSH alone. In addition, either NCSH or the combination of CSH and Na<sub>2</sub>SO<sub>4</sub> could make the concrete reach the frost resistance level of F200, and the concrete with appropriate dose of NCSH can still maintain the low mass loss rate and high relative dynamic elastic modulus after 200 freeze-thaw cycles; while the concrete with Na<sub>2</sub>SO<sub>4</sub> did not reach F200. </div>

Cited by 0Open access

Compressive strength test.

Feng Zhang (6548), Jinxiao Liu (13225671), Jiawei He (3665995) et al. · Figshare · 2025

<div> As the excavation depth of the tunnel increases, the stress on the surrounding rock increases, and the tunnel becomes fragmented, especially in coal tunnels, which require grouting reinforcement. Conventional materials are inadequate for the grouting and reinforcing demands of this type of surrounding rock; therefore, it is essential to create grouting materials with specific expansion properties. First, the orthogonal test method was employed to optimize the expansion grouting materials ratio. Compared with traditional grouting materials, it exhibits certain expansibility along with good fluidity and strength. Based on a comprehensive evaluation of the mechanical properties of the material, the optimal formulation was determined as follows: 10% UEA expansive agent, 5% early-strength agent, and 1.2% water-reducing agent. Additionally, Through SEM tests and grouting reinforcement test of broken coal or rock, it was found that expansive grouting materials can effectively fill micro-fractures in coal rock, enhance the integrity of the surrounding rock, and improve its mechanical properties. The findings indicate that the recovery strength of coal and rock using expansion grouting materials at 7 days is 0.18 and 0.1 greater than that of pure cement; at 28 days, the recovery strength of coal and rock is 0.27 and 0.15 higher than that of pure cement. Ultimately, the expansion grouting materials is employed in engineering applications. Following the application of anchor grouting and expansion grouting materials, the maximum deformation of the roof at the roadway intersection measures 125 mm, while the maximum deformation on both sides reaches 190 mm. The distortion of the surrounding rock of the roadway is well managed. This is essential for the reinforcement of tunnels within shattered surrounding rock and for the secure extraction of coal in mines. </div>

Cited by 0Open access

Unconfined compressive strength.

Jianmin Guo (5739536), Xizhong Xu (21474193), Xiaohui Song (1578754) et al. · Figshare · 2025

<div> Through physical and chemical reactions in the presence of phosphogypsum, steel slag and fly ash modify the load-bearing skeleton and fill the pores of the wasted soil, resulting in high-strength performance. Extensive experiments that compared Portland cement with phosphogypsum-fly ash-steel slag-based cement (PFS cement) revealed that the later-stage unconfined compressive strength (UCS) of PFS cement exceeded that of Portland cement by approximately 33.18%. In terms of the stress-strain curve, the maximum stress and yield strength of PFS cement-stabilized waste soil were 40% to 50% higher than those of Portland cement. In the dry-wet cycle resistance experiment, PFS cement-stabilized waste soil showed a compressive strength increase of 15.17% over Portland cement. Furthermore, during the freeze-thaw cycle test, PFS cement-stabilized waste soil demonstrated a 29.95% higher performance compared to Portland cement. When used as a solidifying agent, PFS cement exhibits significant advantages over Portland cement in backfilling for underground engineering, trenches, roadbeds, bridge abutments, and road base layers. </div>

Cited by 0Open access

Compressive strength comparison.

Xiaofan Cao (21354705), Song Wang (144220), Xiaoli Wang (46677) et al. · Figshare · 2025

<div> Gob-side entry retention (GER) has been successfully advanced and implemented for several years. Notably, strong economic returns have been realised for different thicknesses of coal seams under near-horizontal and gently inclined conditions. However, implementing gob-side entry retention under the conditions of high dip angle or steeply inclined coal seam has always been difficult. This paper systematically introduces the material and construction processes of flexible formwork GER. Engineering practice, theoretical calculations and indoor test analysis were used to propose an independently designed and developed special-shaped flexible formwork concrete wall with a width of 1.2 m, a strength of C30 and an inclination angle of 20°. This wall was then used to investigate the GER technology in the No. 31342 working face of the Dachiba Coal Mine. The findings reveal that the strength of the developed coal solid waste flexible formwork concrete fulfils the design requirements, and the residual strength and healing capacity are superior to that of ordinary concrete. The design of the supporting parameters of flexible formwork GER was satisfactory in the No. 31342 working face of the Daichiba Coal Mine. The overall deformation of the roadway is small, and a decent effect is obtained with respect to retaining the roadway. Hence, the technical challenge of enacting GER in medium-thick coal seams with a high dip angle under the filling and supporting modes has been resolved successfully. </div>

Cited by 0Open access

Unconfined compressive strength.

Jie Liu (15128), Qinli Liu (21722090), Chao Pu (8433930) et al. · Figshare · 2025

<div> To enhance the mechanical and durability properties of cement-fly ash stabilized aeolian sand and crushed stones, the synergistic optimization effects of basalt fibers and polycarboxylate superplasticizer were investigated. First, two full factorial experiments were conducted to evaluate the individual and combined effects of basalt fiber volume content and polycarboxylate superplasticizer mass content. Then, four mix proportions were selected to verify the durability optimization. Finally, SEM, EDS, and XRD were used to elucidate the underlying micro-mechanisms. The results indicate that the optimal combination was 0.1% volume content of 12-mm-long basalt fibers and 1.0% mass content of polycarboxylate superplasticizer, which yielded a compressive strength of 13.3 MPa and a splitting tensile strength of 1.14 MPa at 28 days. Compared to the control group and individual addition of basalt fibers or polycarboxylate superplasticizer, the group with both basalt fibers and polycarboxylate superplasticizer had 33.00%, 16.67%, and 14.66% higher compressive strength and 52.00%, 31.03%, and 28.09% higher splitting tensile strength, respectively. Furthermore, the combined optimization improved the durability, decreased the thermal shrinkage by 49.85%, 32.35%, and 28.84%, and decreased the drying shrinkage by 68.95%, 33.15%, and 47.58%. The micro-experiments demonstrate that the bridging effect of basalt fibers during micro-crack formation and the synergistic action of polycarboxylate superplasticizer enhanced the uniformity and density of the mixture and that they are the primary factors that contribute to the strength development. Therefore, cement-fly ash stabilized aeolian sand and crushed stones can be optimized by using basalt fibers and polycarboxylate superplasticizer. </div>

Cited by 0Open access

Compressive strength curve.

Genasan Krishnamurithy (6519554), Saktiswaren Mohan (6519557), Noor Azlin Yahya (6519560) et al. · Figshare · 2019

&lt;p&gt;Stress-strain response of FU scaffold sintered at 800 ºC (a representative curve of three individual tests).&lt;/p&gt;

Cited by 0Open access

Testing High-Strength Concrete Compressive Strength

Michel Lessard, Omar Challal, Pierre-Claude Aticin · ACI Materials Journal · 1993

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HIGH-COMPRESSIVE-STRENGTH CONCRETE.

K L Saucier, William O. Tynes, Eugene F. Smith · 1965

Abstract : The information contained herein constitutes the third and final report on high-compressive-strength concrete. The first report consisted of a review of the state of the art. In phase two approximately 150 mixtures were proportioned to study the effect of mixture variables on the ultimate strength. In this report are presented the results of the previous two phases, and results of physical and thermal tests of highstrength concrete including creep, shrinkage, thermal properties, heat rise, and stress-strain relations. Procedures for proportioning, mixing, placing, using, testing, and inspecting high-strength concrete are discussed as well as the practical application of high-strength concrete to structural works. Recommendations are made for additional studies to fully utilize the properties of high-strength concrete. (Author)

Cited by 0

Anisotropic Concrete Compressive Strength

Søren Gustenhoff Hansen, Henrik Brøner Jørgensen, Linh Cao Hoang · Report · 2017

&lt;p&gt;When the load carrying capacity of existing concrete structures is (re-)assessed it is often based on compressive strength of cores drilled out from the structure. Existing studies show that the core compressive strength is anisotropic; i.e. it depends on whether the cores are drilled parallel or perpendicular to the casting direction. Engineers may therefore misjudge the load carrying capacity. Thus structures may be strengthened or rebuilt unnecessarily or left in service with high failure probability.&lt;/p&gt;&lt;p&gt;This paper presents a literature review and an experimental study on the anisotropy and its correlation to the curing time. The experiments show no correlation between the anisotropy and the curing time and a small strength difference between the two drilling directions. The literature shows variations on which drilling direction that is strongest. Based on a Monto Carlo simulation of the expected variation it is argued that the variation of the anisotropy may be statistically coincidences.&lt;/p&gt;

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