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    蘇州混凝土水泥制品研究院有限公司

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    第九期

    擴鏈劑改性聚羧酸系高性能減水劑的試驗研究
    擴鏈劑改性聚羧酸系高性能減水劑的試驗研究
    • 王茂桑1,黃世謀2,李憲軍1
    2015年第9期
    摘要
    引用本文
    摘 要:對四種聚羧酸系高性能減水劑進行了擴鏈劑改性研究,并優化出最佳改性工藝。結果表明,改性后的聚羧酸系高性能減水劑A對水泥的分散性能僅起到抵消緩釋作用,B、C、D對水泥的分散性能有很大的提高,尤其是對保坍性能較差的減水劑;改性后的減水劑對混凝土的流變性能與水泥凈漿流動度的變化規律基本一致,對混凝土的含氣量、抗壓強度、滲透性能和外觀質量有了明顯改善,而且降低了成本;同時,從分子鏈結構搭配的角度分析了擴鏈劑的改性機理。 Abstract: Four kinds of polycarboxylic high performance water reducer were modified by chain extender, and the best modification technology was optimized. The results show that the modified polycarboxylic high performance water reducer A only plays release effect on the dispersiveness of cement, while the modified polycarboxylic high performance water reducer B, C and D can greatly improve the dispersiveness of the cement, especially to the water reducer with poor slump performance. Furthermore, the influence of the modified water reducer on rheological properties of concrete has the same rule as that of the modified water reducer on the fluidity of cement paste. In addition, gas content, compressive strength, permeability and appearance quality of the concrete are obviously improved and the cost is also reduced. Finally, the modification mechanism of chain extender is analyzed from the point of the molecular chain structure.
    環氧樹脂混凝土的抗火性能研究
    環氧樹脂混凝土的抗火性能研究
    • 劉克非1,徐志勝2
    2015年第9期
    摘要
    引用本文
    摘 要:為明確環氧樹脂混凝土的抗火性能,通過室內試驗測試了常溫(25℃)及不同高溫條件(100℃、300℃、500℃、700℃、900℃)下環氧樹脂混凝土和水泥混凝土的軸心抗壓強度與抗壓彈性模量。結果表明,常溫下環氧樹脂混凝土的韌性明顯優于水泥混凝土,高溫下環氧樹脂混凝土的力學性能優于水泥混凝土。理論上,環氧樹脂混凝土可應用于結構修復與補強工程中,但其高溫下的其它性能需通過進一步研究確定。 Abstract: In order to determinate the fire resistance of epoxy resin concrete, the laboratory tests have been implemented to measure the axial compressive strength and elastic modulus of epoxy resin concrete and cement concrete under the different temperatures (25℃, 100℃, 300℃, 500℃, 700℃ and 900℃). The results show that the toughness of epoxy resin concrete is obviously superior to that of cement concrete under the normal temperature, and the mechanical properties of epoxy resin concrete is better than that of cement concrete under the high temperatures. Theoretically, epoxy resin concrete can be applied to the repair and reinforcement engineering of structure, but its other performances under high temperatures must be confirm through further research.
    火山灰混凝土抗化學侵蝕性能試驗研究
    火山灰混凝土抗化學侵蝕性能試驗研究
    • 趙 娟,姜 蓉,李 倍
    2015年第9期
    摘要
    引用本文
    摘 要:以云南地區在建大瑞鐵路為依托,利用工程建設沿線——騰沖區域內豐富的天然火山灰資源,探討了火山灰作為混凝土礦物摻合料應用于鐵路路基加固與防護工程結構物中的可行性。通過基本力學性能試驗、電通量試驗以及為期兩年的硫酸鹽全浸泡試驗,研究了火山灰混凝土的抗壓強度、電通量以及抗化學侵蝕性能與火山灰摻量、養護齡期等的相關規律。研究表明,火山灰混凝土具有良好的力學性能和抗化學侵蝕能力,其抗化學侵蝕性能隨其水膠比的降低而提高;單摻天然火山灰混凝土的電通量較基準混凝土有所降低,但無法滿足鐵路工程中的化學侵蝕環境要求。建議復摻硅灰來提高混凝土的抗環境侵蝕能力,滿足鐵路混凝土工程建設的要求。 Abstract: The research relied on the a buliding Dali-Ruili railway in Yunnan province. The abundant natural volcanic ash resource along the railway line was been utilized as mineral admixture into concrete binder, and its application practicability for the subgrade consolidation and protective engineering was discussed. Adopting the basic mechanics property test and dielectric flux test and the sulphate immersion test, correlative discipline between the compressive strength, the resistance to chemical attacking of the volcanic ash concrete and the mixing ratio, age of the volcanic ash concrete were expounded. The research show that the mechanical property and resistance to chemical attack of natural volcanic ash concrete are well, and they grow up with the decreasing level of water binder ratio. Passed electric charge of concrete with only natural volcanic ash reduces to lower than the reference concrete, but it isn’t up to the standard of the railway concrete durability requirement for resistance to chemical attacking. Therefore, double mixing with silica fume is proposed to improve the resistance capability to chemical attack of concrete, which could satisfy the requirement of the railway concrete engineering construction.
    三相導電混凝土強度及導電性能試驗研究
    三相導電混凝土強度及導電性能試驗研究
    • 歐陽平
    2015年第9期
    摘要
    引用本文
    摘 要:為優化碳纖維-鋼纖維-石墨三相導電混凝土中三種導電材料的組成比例,試驗研究了三種材料摻量以及石墨細度對混凝土抗壓強度和導電性能的影響,并通過灰關聯分析得出三種材料對導電性能影響的顯著程度。結果表明,碳纖維摻量越大,混凝土導電性能越好,當碳纖維摻量大于0.8%時,電阻率趨于穩定,當碳纖維摻量為0.4%時強度最大,初步確定碳纖維摻量為0.4%;電阻率與碳纖維摻量之間呈對數規律變化;養護齡期越長,導電性能越差,當齡期超過21d后,導電性能趨于穩定;石墨顆粒越細混凝土強度越低,導電性能越好,其中石墨細度為400目和600目時導電性能極為接近;隨著石墨摻量的增大,抗壓強度和電阻率逐漸減小,當石墨摻量超過8%時,導電性能趨于穩定。綜合確定碳纖維、鋼纖維和石墨摻量分別為0.5%、0.8%和5%時,混凝土導電性能最好,同時具有較高的強度;三種導電材料對混凝土導電性能影響的顯著程度是:碳纖維>石墨>鋼纖維。 Abstract: In order to optimize carbon fiber-steel fiber-graphite conductive concrete composition ratio of the three-conductive material, through experiment, the effects of three graphite materials content and fineness on concrete compressive strength and electrical conductivity are studied in this paper, and through Grey analysis of the three materials, significant degree of influence on conductivity is derived. The results show that the greater the carbon fiber content, the better the performance of concrete conductivity, when the carbon fiber content greater than 0.8%, the resistivity tends to be stable, while the carbon fiber content of 0.4%, the maximum intensity, initially identified carbon fiber content is 0.4%; logarithmically content varies between resistivity and carbon fiber. The longer the curing period, the worse conductivity, and when the age of more than 21d, the conductive properties are stabilized. The finer the graphite particles, the lower the concrete strength, and the better the electrical conductivity, in which the graphite fineness of 400 mesh and 600 mesh, the conductive properties are extremely close. As the graphite content increases, the compressive strength and electrical resistivity decreases, when the graphite content exceeds 8%, the conductivity is stabilized. Comprehensive determining carbon fiber, steel fiber and graphite content with 0.5%, 0.8% and 5%, the best performance concrete conductivity and high strength can be obtained, and a significant degree of three-conductive material on conductive property effects of concrete is: carbon fiber>graphite>steel fiber.
    高原地區混凝土徐變性能控制研究
    高原地區混凝土徐變性能控制研究
    • 納啟財1,胡玉兵2,陳紅偉1,張云必2
    2015年第9期
    摘要
    引用本文
    摘 要:混凝土的徐變容易導致大跨徑連續剛構橋的長期變形,而高原地區較低的濕度會加劇混凝土的徐變,影響混凝土結構的性能。本文結合高原地區的環境特點,考察大氣溫濕度對于混凝土徐變的影響規律,從混凝土配合比參數、加載齡期以及早期養護方式的選擇等角度進行了研究分析。結果表明,減小水膠比、摻入粉煤灰、減小砂率、延長加載齡期、保證早期養護濕度能夠有效控制混凝土的徐變,提升混凝土結構的質量。 Abstract: Creep of concrete can result in long-term deflection of the long-span continuous rigid frame bridge. Low humidity in plateau area will intensify the creep of concrete and affects the performance of concrete structure. This paper inspects the influence of air temperature and humidity, then the mix parameters,loading age and early-age curing mode to creep law of concrete are studied and analyzed. The results show that reducing the water-cement ratio, mixing fly ash, reducing the rate of sand, extending the age of loading and ensuring early curing humidity can control the creep of concrete effectively and enhance the quality of concrete structure.
    偏高嶺土在高強混凝土中的應用
    偏高嶺土在高強混凝土中的應用
    • 陳曉剛,范志勇,秦 瓊
    2015年第9期
    摘要
    引用本文
    摘 要:闡述了具有火山灰特性的偏高嶺土在混凝土中的應用情況,通過配制C50和C60兩種高強混凝土,進行了強度、氯離子滲透、收縮試驗,進一步驗證了偏高嶺土材料在混凝土應用中的耐久性能表現。 Abstract: The metakaolin with pozzolanic characteristics in the application of concrete is described. By preparing C50 and C60 high strength concrete, the strength, chloride ion penetration, shrinkage test are carried out, which further verify the metakaolin material in the concrete application for durable performance.
    納米級混凝土養護修復一體劑的研究與應用
    納米級混凝土養護修復一體劑的研究與應用
    • 姚國友,安雪暉
    2015年第9期
    摘要
    引用本文
    摘 要:納米混凝土養護修復一體劑是基于納米科技研發出的一種用于混凝土養護、防水防劣化、修復細微裂紋等的無機改性材料。本文對佳固士材料的概念、原理、優勢及其施工方法進行了簡單介紹,并結合實驗室試驗和實際應用工程,驗證了其優異的防水防護和表面增強性能。 Abstract: Nano concrete curing and repair agent is an inorganic modified material which is based on nanotechnology,nanotechnology, it is used for curing, waterproofing, anti-deterioration and repair fine cracks of concrete. In this paper, the concept, principle, advantages and construction method of GUARDEX are introduced, the excellent performance of waterproofing and surface strength improving are verified by the laboratory test and practical application.
    預制混凝土竹節樁及靜鉆根植樁應用簡介
    預制混凝土竹節樁及靜鉆根植樁應用簡介
    • 嚴天龍1,2,許遠榮1,2,張日紅1,2,周佳錦3
    2015年第9期
    摘要
    引用本文
    摘 要:靜鉆根植樁是由預制樁和樁周水泥土構成的一種非擠土新型預制樁樁基。本文概述了預制混凝土竹節樁、靜鉆根植樁及靜鉆根植工法,并通過現場靜載試驗,分析了豎向荷載作用下靜鉆根植樁應用的優越性及可靠性。 Abstract: The static drill rooted pile is a new kind of composite pile that consists of precast pile and the surrounding cemented soil, and it has a lot of advantages. The precast nodular pile, the static drill rooted pile and the static drill rooted method are introduced, and the advantages as well as quality assurance of the static drill rooted pile under vertical loads is investigated by analyzing the field test results.
    矩形鋼筋混凝土構件彎剪扭組合受力試驗研究
    矩形鋼筋混凝土構件彎剪扭組合受力試驗研究
    • 孫 亮,王 璞,黃 真
    2015年第9期
    摘要
    引用本文
    摘 要:設計了組合試驗裝置和系列彎剪扭受力組合,完成了7根鋼筋混凝土矩形截面構件的彎剪扭組合試驗研究?;谇疤K聯學者提出的鋼筋混凝土構件斜截面極限強度理論,提出了鋼筋混凝土構件彎剪扭組合受力強度計算公式,并將本文理論模型計算數據與本文及已有的試驗數據作比較,發現結果均基本一致。 Abstract: The experimental equipment and a serial of force combinations are designed, and seven pieces of reinforced concrete members are experimented with different forces combination of bending, shear and torsion. Here, the traditional ultimate strength model of inclined sections is modified, and the failure strength of reinforced concrete members under combined forces is calculated. The theoretical results are compared with the experimental results of seven RC members, as well as other experimental results, which shows a good coordination.
    預制混凝土箱梁水化熱溫度場數值分析
    預制混凝土箱梁水化熱溫度場數值分析
    • 張益多1,郭義全1,張國云2
    2015年第9期
    摘要
    引用本文
    摘 要:預制箱梁混凝土水化熱產生的溫度裂縫問題是目前工程界尚未完全解決的問題。本文以哈大高鐵預應力混凝土箱梁的預制工程為背景,通過ANSYS有限元分析軟件,基于三維非穩態溫度場理論對跨度32m預制箱梁水化熱溫度場進行有限元模擬,并將有限元分析結果與現場實測數據進行對比。研究結果表明,采用數值分析的方法可以較為真實地模擬混凝土水化熱溫度場。本文所研究的成果可為大型混凝土箱梁預制過程的溫度監控、防止溫度裂縫產生提供一定的理論依據。 Abstract:The hydration heat temperature crack problem of precast box girder concrete is an engineering problem whicih has not yet been completely solve.Based on the precast construction of Harbin-Dalian high-speed rail prestressed concrete box girder and the theory of three-dimensional unsteady temperature field, the hydration heat temperature field of precast concrete box girders with 32m span is simulated through the ANSYS finite element analysis software and the finite element analysis results are compared with the measured data. The results show that using the method of numerical analysis can be more realistic simulation of concrete hydration heat temperature field, and this article research results can provide a theoretical basis for large precast concrete box girder temperature monitoring of the process and preventing temperature cracks.
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