超早強(qiáng)硫鋁酸鹽水泥基材料研究與應(yīng)用
發(fā)布時間：2019-05-26 18:45
【摘要】：隨著社會經(jīng)濟(jì)的不斷進(jìn)步,對現(xiàn)有工程和新建工程的要求愈來愈高,普通混凝土已經(jīng)難以滿足一些工程對材料的特殊要求。如鐵路、高架橋梁、軍事工程和重大基礎(chǔ)建設(shè)等工程要求某些部位的材料能夠在較短的時間內(nèi)獲得較高的力學(xué)性能,并且易于施工。針對這種情況,本文依托濟(jì)青高速改擴(kuò)建工程,選用硫鋁酸鹽水泥結(jié)合自主研制的專用復(fù)合外加劑制備了一種超早強(qiáng)硫鋁酸鹽水泥基材料。該材料環(huán)保節(jié)能,施工方便,具有流動性好、凝節(jié)時間適中、早期強(qiáng)度高、與普通硅酸鹽混凝土粘結(jié)性能強(qiáng)、抗凍性好、耐硫酸鹽侵蝕性強(qiáng)等特點(diǎn),適用于公路橋梁等工程的維修加固和對材料有早強(qiáng)要求的工程。為硫鋁酸鹽水泥在特殊膠凝材料領(lǐng)域的研究和應(yīng)用提供參考。本文首先研配了硫鋁酸鹽水泥專用復(fù)合外加劑。通過對甲酸鈣、碳酸鋰和硫酸鋁等在硫鋁酸鹽水泥水化反應(yīng)中的促凝機(jī)理研究和試驗(yàn),配制了硫鋁酸鹽水泥專用復(fù)合早強(qiáng)劑(ICCH),ICCH能夠顯著提高水泥的小時強(qiáng)度,并對長期強(qiáng)度無不利影響。為延緩水泥凝結(jié),確保足夠的操作時間,利用硼酸、纖維素醚等研配了水泥專用復(fù)合緩凝劑(BS),BS能夠穩(wěn)定有效的延緩硫鋁酸鹽水泥凝結(jié)時間。通過自主研配的硫鋁酸鹽水泥專用復(fù)合外加劑配制出了超早強(qiáng)硫鋁酸水泥凈漿、砂漿和混凝土。水泥凈漿初始流動度大于200mm,初凝時間約20min,4h抗壓強(qiáng)度達(dá)到46.64MPa,最終強(qiáng)度超過70MPa;砂漿流動性良好,依據(jù)相關(guān)標(biāo)準(zhǔn)取消振動進(jìn)行測試的流動度大于250mm;保持工作性時間約30min,2h抗壓強(qiáng)度超過30MPa,4h抗壓強(qiáng)度達(dá)到43.7MPa,1d抗壓強(qiáng)度超過50MPa,后期強(qiáng)度穩(wěn)定增長;混凝土保持工作性時間超過40min,4h抗壓強(qiáng)度不低于40MPa,7d抗壓強(qiáng)度超過50MPa,抗折強(qiáng)度在4h后均不小于6.5MPa。研究了超早強(qiáng)硫鋁酸鹽水泥基材料的早期特性和耐久性。試驗(yàn)證明,該材料具有較好的早期抗裂性,并且體積最終不發(fā)生收縮;其能夠與硅酸鹽水泥基材料和自身材料很好的粘結(jié),自身粘結(jié)的抗折強(qiáng)度在1d后不低于6MPa;該材料具有優(yōu)異的抗凍性能,在250次凍融循環(huán)后,抗壓強(qiáng)度仍保持40MPa以上;其耐硫酸鹽侵蝕性能優(yōu)良,在飽和硫酸鈉溶液中浸泡90d后,抗壓強(qiáng)度最低值超過40MPa,抗折強(qiáng)度大于10MPa。本文研配的超早強(qiáng)硫鋁酸鹽水泥于2016年8月和11月提前在甘肅橋梁維修加固項目上應(yīng)用,能夠確保4h達(dá)到通車要求,大大縮短了工期,取得了良好效果。將于2017年11月用于濟(jì)青高速改擴(kuò)建工程。
[Abstract]:With the continuous progress of social economy, the requirements for existing and new projects are getting higher and higher, and ordinary concrete has been difficult to meet the special requirements of some projects for materials. For example, railways, viaducts, military projects and major infrastructure projects require that materials in certain parts can obtain higher mechanical properties in a relatively short period of time, and are easy to construct. In view of this situation, based on the Jiqing high speed reconstruction and expansion project, a super early strength sulphoaluminate cement based material was prepared by using sulphoaluminates cement combined with a special compound admixture developed by ourselves. The material has the advantages of environmental protection and energy saving, convenient construction, good mobility, moderate setting time, high early strength, strong bond performance with ordinary silicate concrete, good frost resistance, strong sulfate corrosion resistance and so on. It is suitable for maintenance and reinforcement of highway and bridge projects and projects with early strength requirements for materials. It provides a reference for the research and application of sulphoaluminate cement in the field of special cementitious materials. In this paper, a special compound admixture for sulphoaluminate cement was developed. Through the study and test on the coagulation promoting mechanism of calcium formate, lithium carbonate and aluminum sulfate in the hydration reaction of sulphoaluminate cement, the special compound early strength agent (ICCH), ICCH for sulphoaluminate cement was prepared, which can significantly improve the hourly strength of cement. And has no adverse effect on the long-term strength. In order to delay the setting of cement and ensure enough operation time, (BS), BS, a special compound retarder for cement, was developed by using boric acid and cellulose ether to delay the setting time of sulphoaluminate cement stably and effectively. The super early strength sulphoalicylic acid cement paste, mortar and concrete were prepared by using the special compound admixture of sulphoaluminate cement developed by ourselves. The initial mobility of cement paste is more than 200 mm, the initial setting time is about 20 min, the compressive strength of 4 h is 46.64 MPA, and the final strength is more than 70 MPA, and the mobility of mortar is good, and the mobility of mortar is more than 250 mm according to the relevant standards. When the working time was kept for about 30 min, the 2 h compressive strength exceeded 30 MPA, the 4 h compressive strength reached 43.7 MPA, the 1 d compressive strength exceeded 50 MPA, and the strength increased steadily at the later stage. The working time of concrete is more than 40 min, the compressive strength of 4 h is not less than 40 MPA, the 7 d compressive strength is more than 50 MPA, and the bending strength is not less than 6.5 MPA after 4 h. The early characteristics and durability of super early strength sulphoaluminate cement based materials were studied. The experimental results show that the material has good early crack resistance, and the volume does not shrink at last, and it can bond well with silicate cement-based material and its own material, and the bending strength of self-bonding material is not less than 6 MPA after 1 day. The material has excellent frost resistance, and the compressive strength is still above 40MPa after 250 freeze-thaw cycles. After soaking in saturated sodium sulfate solution for 90 days, the lowest compressive strength is more than 40 MPA, and the bending strength is more than 10 MPA. The super early strong sulphoaluminate cement developed in this paper was applied to Gansu bridge maintenance and reinforcement project in August and November 2016 in advance, which can ensure that the opening requirement of 4 hours can be met, the construction period has been greatly shortened, and good results have been obtained. It will be used for the reconstruction and expansion of Jiqing Expressway in November 2017.
【學(xué)位授予單位】：煙臺大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU528
本文編號：2485541
[Abstract]:With the continuous progress of social economy, the requirements for existing and new projects are getting higher and higher, and ordinary concrete has been difficult to meet the special requirements of some projects for materials. For example, railways, viaducts, military projects and major infrastructure projects require that materials in certain parts can obtain higher mechanical properties in a relatively short period of time, and are easy to construct. In view of this situation, based on the Jiqing high speed reconstruction and expansion project, a super early strength sulphoaluminate cement based material was prepared by using sulphoaluminates cement combined with a special compound admixture developed by ourselves. The material has the advantages of environmental protection and energy saving, convenient construction, good mobility, moderate setting time, high early strength, strong bond performance with ordinary silicate concrete, good frost resistance, strong sulfate corrosion resistance and so on. It is suitable for maintenance and reinforcement of highway and bridge projects and projects with early strength requirements for materials. It provides a reference for the research and application of sulphoaluminate cement in the field of special cementitious materials. In this paper, a special compound admixture for sulphoaluminate cement was developed. Through the study and test on the coagulation promoting mechanism of calcium formate, lithium carbonate and aluminum sulfate in the hydration reaction of sulphoaluminate cement, the special compound early strength agent (ICCH), ICCH for sulphoaluminate cement was prepared, which can significantly improve the hourly strength of cement. And has no adverse effect on the long-term strength. In order to delay the setting of cement and ensure enough operation time, (BS), BS, a special compound retarder for cement, was developed by using boric acid and cellulose ether to delay the setting time of sulphoaluminate cement stably and effectively. The super early strength sulphoalicylic acid cement paste, mortar and concrete were prepared by using the special compound admixture of sulphoaluminate cement developed by ourselves. The initial mobility of cement paste is more than 200 mm, the initial setting time is about 20 min, the compressive strength of 4 h is 46.64 MPA, and the final strength is more than 70 MPA, and the mobility of mortar is good, and the mobility of mortar is more than 250 mm according to the relevant standards. When the working time was kept for about 30 min, the 2 h compressive strength exceeded 30 MPA, the 4 h compressive strength reached 43.7 MPA, the 1 d compressive strength exceeded 50 MPA, and the strength increased steadily at the later stage. The working time of concrete is more than 40 min, the compressive strength of 4 h is not less than 40 MPA, the 7 d compressive strength is more than 50 MPA, and the bending strength is not less than 6.5 MPA after 4 h. The early characteristics and durability of super early strength sulphoaluminate cement based materials were studied. The experimental results show that the material has good early crack resistance, and the volume does not shrink at last, and it can bond well with silicate cement-based material and its own material, and the bending strength of self-bonding material is not less than 6 MPA after 1 day. The material has excellent frost resistance, and the compressive strength is still above 40MPa after 250 freeze-thaw cycles. After soaking in saturated sodium sulfate solution for 90 days, the lowest compressive strength is more than 40 MPA, and the bending strength is more than 10 MPA. The super early strong sulphoaluminate cement developed in this paper was applied to Gansu bridge maintenance and reinforcement project in August and November 2016 in advance, which can ensure that the opening requirement of 4 hours can be met, the construction period has been greatly shortened, and good results have been obtained. It will be used for the reconstruction and expansion of Jiqing Expressway in November 2017.
【學(xué)位授予單位】：煙臺大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU528
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