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纤维素醚对无砂自流平材料物理力学性能的影响
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作者 欧志华 赵明明 +3 位作者 李光球 李家楣 李芳涛 曹晖 《上海建材》 2022年第6期10-13,共4页
将自流平砂浆中的细骨料换成粉料,制成无砂自流平材料,可以减少离析并充分利用废弃粉料。试验研究了2种不同黏度的纤维素醚对无砂自流平材料流动度和力学性能的影响,结果表明:随低黏纤维素醚掺量的增加,自流平材料的初始流动度和30min... 将自流平砂浆中的细骨料换成粉料,制成无砂自流平材料,可以减少离析并充分利用废弃粉料。试验研究了2种不同黏度的纤维素醚对无砂自流平材料流动度和力学性能的影响,结果表明:随低黏纤维素醚掺量的增加,自流平材料的初始流动度和30min流动度都先增加,后逐渐减少,抗新和抗压强度大体上呈先增加后减少,再趋于稳定的趋势;随中黏纤维素醚掺量的增加,自流平材料的流动度先下降,后略有提升并保持稳定,抗新和抗压强度大体上呈先下降较快,后有所增加且总体上保持稳定的趋势。中黏纤维素醚不适合用于自流平材料,应该选择使用低黏的纤维素醚,且掺量小于0.2‰。 展开更多
关键词 无砂自流平材料 纤维素醚 流动度 抗新强度 强度
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Ultra-High Strength Concrete Mixtures Using Local Materials 被引量:6
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作者 Srinivas Allena Craig M. Newtson 《Journal of Civil Engineering and Architecture》 2011年第4期322-330,共9页
This paper presents the development of ultra high strength concrete (UHSC) using local materials. UHSC mixture proportions were developed using local materials so that UHSC may be made more affordable to a wider var... This paper presents the development of ultra high strength concrete (UHSC) using local materials. UHSC mixture proportions were developed using local materials so that UHSC may be made more affordable to a wider variety of applications. Specifically, local sand with a top size of 600 um, and locally available Type I/II cement and silica fume were used in this research. Each of these material selections is seen as an improvement in sustainability for UHSC. Two mixtures (one with and one without fibers) were recommended as the UHSC mixtures. The greatest compressive strengths obtained in this study were 165.6 MPa for UHSC with steel fibers and 161.9 MPa for UHSC without fibers. The compressive and flexural strengths obtained from the UHSC mixtures developed in this work are comparable to UHSC strengths presented in the literature. Producing this innovative material with local materials reduces the cost of the material, improves sustainability, and produces mechanical performance similar to prepackaged, commercially available products. 展开更多
关键词 Compressive strength local materials modulus of rupture SUSTAINABILITY ultra-high strength
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Freezing and Thawing Durability of Ultra High Strength Concrete
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作者 Jesus Muro-Villanueva Craig M. Newtson +2 位作者 Brad D. Weldon David V. Jauregui Srinivas Allena 《Journal of Civil Engineering and Architecture》 2013年第8期907-915,共9页
Resistance to freezing and thawing of two UHSC (ultra high strength concrete) mixtures was evaluated in accordance with ASTM C 666 Procedure A. The two mixtures (plain and fiber reinforced) were developed using ma... Resistance to freezing and thawing of two UHSC (ultra high strength concrete) mixtures was evaluated in accordance with ASTM C 666 Procedure A. The two mixtures (plain and fiber reinforced) were developed using materials local to southern New Mexico, USA. Three different curing regimens were investigated for the mixture with fibers and one curing regimen was studied for the mixture without fibers. All curing regimens included 24 h of ambient curing followed by four days of wet curing at 50 ℃, and then two days dry curing at 200 ℃. At an age of seven days, one batch of fiber reinforced specimens was air cured at ambient conditions for the following six days and then placed in a water bath at 4.4 ℃ for 24 h prior to initiating freezing and thawing cycles. The second batch was air cured from day seven to day 12, and then wet cured for one day at 23 ℃ prior to being placed in the 4.4 ℃ water bath. The final batch was wet cured at 23 ℃ from the seventh day to an age of 13 days and then placed in the 4.4 ℃ water bath. The mixture with no fibers was air cured from the seventh day to an age of 12 days and then wet cured for one day at 23 ℃ prior to being placed in the 4.4 ℃ water bath. Higher moisture levels during curing produced greater initial dynamic elastic modulus values and durability factors at the end of the freezing and thawing tests, with the greatest durability factor being 87.5. Steel fibers were observed to improve both compressive strength and durability factor for UHSC. 展开更多
关键词 Ultra high strength freezing and thawing DURABILITY dynamic elastic modulus quality factor.
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The Application of Maturity Method on Whitetopping Construction
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作者 Jung Jong Suk Park Yong Boo Jun Myoung Hoon Sohn Jeong Rak 《Journal of Civil Engineering and Architecture》 2011年第3期233-240,共8页
The primary objective of this study was to assess the use of the maturity method to determine the joint sawing window and the traffic opening time on whitetopping construction in Korea. To determine joint sawing time,... The primary objective of this study was to assess the use of the maturity method to determine the joint sawing window and the traffic opening time on whitetopping construction in Korea. To determine joint sawing time, it was necessary to find the minimum strength not to cause raveling and to identify the time to the occurrence of drying shrinkage. This study found that the minimum compressive strength for joint sawing was 4.41MPa (45kg/cm2) and drying shrinkage occurred just after the concrete temperature reached at the peak. To develop the relationship between compressive strength and maturity values, thermachron i-buttons were inserted into the top and mid-depth of the fresh concrete in the test slabs. The results of the laboratory tests indicated that the Arrhenius equation better fitted the relationship between the compressive strength and maturity values than did the Nurse-Saul equation. However, the Nurse-Saul function estimated in-place strength quite well in this study. Therefore, the Nurse-Saul equation was used to determine the joint sawing window and the traffic opening time for whitetopping construction. 展开更多
关键词 MATURITY Nurse-Saul function Arrhenius equation whitetopping
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