These are important for developing new antennas with a high directivity and a high workability 這些結(jié)果對發(fā)展高方向性、可實用化的新型天線具有重要意義。
And production fashion is selected optional for assurance of the material character of hpch . the hpch material , in which the compound technique route of polybasic components is applied , has better properties such as high workability , high durability , low ion transference rate and so on 采用多組份復(fù)合技術(shù)路線配制出高工作性、高耐久性、低離子遷移率的hpch材料,對其宏觀物理力學性能、耐久性能和微觀結(jié)構(gòu)進行了分析研究。
According to the need for design and construction of prestressed reinforced concrete of jingzhou yangtze river highway bridge , c60 conctrete was mixed with superfine admixture and high workability agent , then it was speeding up construction progress for the bridge 摘要根據(jù)荊州長江公路大橋預(yù)應(yīng)力混凝土結(jié)構(gòu)設(shè)計、施工要求,采用摻入超細摻和料和高能外加劑配制c60混凝土,長距離、大高度泵送混凝土,為大橋建設(shè)加快進度,確保質(zhì)量起到了作用。
We research the causes of concrete cracking , develop the high performance anti - cracking additive , optimize the concrete mix and construction techniques , increase the stability of concrete volume by shrinkage compensation , enhance splitting tensile strength , and can meet demand of high workability of fresh concrete . . in the study , a thorough investigation of this problem is made from all points of view , with the aid of various modern measurement & testing technology and different theories & methods in surface physical chemistry , structural chemistry , solid - state chemistry , composite materials , fracture mechanics , etc . our research results have shown that the various shrinkage of concrete cause concrete cracking in building engineering , such as autogenous shrinkage , dry shrinkage , temperature shrinkage , plastic shrinkage , carbonized shrinkage , etc 目前,解決混凝土開裂的方法是綜合的,我們調(diào)查研究了混凝土開裂的原因,開發(fā)研制了高性能抗裂外加劑,優(yōu)化混凝土的設(shè)計和施工方法,并通過補償收縮達到混凝土體積穩(wěn)定,提高抗裂強度,滿足混凝土拌和物高工作性能的要求。本研究采用多種測試技術(shù),應(yīng)用表面物理化學、結(jié)構(gòu)化學、固體化學、復(fù)合材料學、斷裂力學等多學科的理論與方法,從不同的角度進行深入的研究和探討。通過調(diào)查研究建筑工程中出現(xiàn)的混凝土開裂、滲漏問題,發(fā)現(xiàn)混凝土在非荷載作用下開裂主要是由混凝土的自收縮、干燥收縮、溫度收縮、塑性收縮、碳化收縮等各種收縮變形引起的。
It is high performance concrete of low water - binder ratio . with its own gravity and without any vibration , it can fill up the space automatically . with high adding quantity of fly ash and slag , high quality water reducing agent and other compound admixture is the most important technology of this kind of high performance concrete . scc focus on high workability at the same time on high strength and high durability through choosing the composite of aggregate , additives , content of cementions material , admixture reasonably and the optimum design of mix proportion 本文研究了采用吉林省本地原材料和常規(guī)生產(chǎn)工藝配制c40自密實混凝土的制作技術(shù),采用水膠比、粉煤灰摻量、砂率、膠凝材料總量四個因素進行配合比的正交設(shè)計,試驗分析了自密實混凝土拌合物的工作性以及硬化后的力學性能、耐久性和生產(chǎn)與施工注意事項,并對其經(jīng)濟性做出了客觀評價,本次試驗為吉林地區(qū)自密實混凝土的推廣應(yīng)用提供了數(shù)據(jù)基礎(chǔ)。
Because of its high strength , high workability , high volume stability and high anti - permeability , hsc ( high strength concrete ) has been widely used throughout the world as a new generation structure material . but due to its low ductility , seldom has it been used in the protective engineering 高強混凝土具有高強度、高工作度、高體積穩(wěn)定性、高抗?jié)B性等優(yōu)良性能,作為新一代建筑材料在國際范圍內(nèi)得到了廣泛應(yīng)用,但是由于高強混凝土的延性較差,未能在防護工程中得到大量使用。