1. 毕业设计（论文）的内容和要求

（一）课题关键问题 目前国内外针对膨胀剂对混凝土开裂的影响已有很多的研究，但研究重点基本都是膨胀剂性能、膨胀剂掺量和膨胀量等性能指标上，缺少膨胀历程对开裂性能影响规律的研究，研究这一课题是十分有必要的。

课题立足于混凝土膨胀剂的研究现状，针对膨胀剂应用中”膨胀历程”与”开裂性能”关系尚不明确的问题，拟通过调控膨胀剂自身特性及复合比例来实现不同膨胀历程的调控，进一步通过对不同膨胀历程的水泥基材料开裂性能的测试，试图寻找膨胀历程与抗裂性能间的规律。

围绕这一总体目标，本课题所要研究的关键问题有： 1. 掺不同复合比例膨胀剂的水泥基材料的变形历程； 2. 掺膨胀剂水泥基材料抗裂性能的测试及其评价； 3. 不同膨胀历程膨胀剂及膨胀产物的微观形态； 4. 膨胀历程对水泥基材料抗裂性能的影响规律。

2. 参考文献

[1] M. Collepardi, R. Troli, M. Bressan, F. Liberatore, G. Sforza, Crack-free concrete for outside industrial floors in the absence of wet curing and contraction joints. Cement Concrete Composites, 30 (2008) 887-891. [2] Pei-wei Gao, Sheng-xing Wu, Ping-hua Lin, Zhong-ru Wu, Ming-shu Tang, The characteristics of air void and frost resistance of RCC with fly ash and expansive agent, Construction and Building Materials 20 (2006) 586-590. [3] Mario Collepardi, Antonio Borsoi, Silvia Collepardi, Jean Jacob Ogoumah Olagot, Roberto Troli, Effects of shrinkage reducing admixture in shrinkage compensating concrete under non-wet curing conditions, Cement Concrete Composites 27 (2005) 704-708. [4] Peiyu Yan, Xiao Qin, The effect of expansive agent and possibility of delayed ettringite formation in shrinkage-compensating massive concrete, Cement and Concrete Research 31 (2001) 335-337. [5] Liwu Mo, Min Deng , Mingshu Tang, Abir Al-Tabbaa, MgO expansive cement and concrete in China: Past, present and future, Cement and Concrete Research 57 (2014) 1-12. [6] E. Serris, L. Favergeon, M. Pijolat, M. Soustelle, P. Nortier, R.S. G#228;rtner, T. Chopin, Z. Habib, Study of the hydration of CaO powder by gas#8211;solid reaction, Cement and Concrete Research 41 (2011) 1078-1084. [7] Takayuki Higuchi, Masataka Eguchi, MinoruMorioka, Etsuo Sakai, Hydration and properties of expansive additive treated high temperature carbonation, Cement and Concrete Research 64 (2014) 11-16. [8] Yong-Soo Lee, Jae-Suk Ryou, Self healing behavior for crack closing of expansive agent via granulation/film coating method, Construction and Building Materials 71 (2014) 188-193. [9] Sudam K. Parida, Sukalyan Dash, Sabita Patel, B.K. Mishra, Adsorption of organic molecules on silica surface, Advances in Colloid and Interface Science 121 (2006) 77-110. [10] Ron S. Faibish, Yoram Cohen, Fouling-resistant ceramic-supported polymer membranes for ultrafiltration of oil-in-water microemulsions, Journal of Membrane Science 185 (2001) 129-143. [11] Vikram Karde, Siddhant Panda, Chinmay Ghoroi, Surface modification to improve powder bulk behavior under humid conditions. Powder Technology 278 (2015) 181-188 [12] James M. Anderson, Matthew S. Shive, Biodegradation and biocompatibility of PLA and PLGA microspheres, Advanced Drug Delivery Reviews, 64 (2012), 72-82. [13] L.-T. Lim, R. Auras, M. Rubino, Processing technologies for poly(lactic acid), Progress in Polymer Science 33 (2008) 820-852. [14] Mejlhede Jensen, P. Freiesleben Hanse, A dilatometer for measuring autogenous deformation in hardening Portland cement paste, Materials and Structures, 1995, 28, 406-409. [15] LI Hua，TIAN Qian，ZHANG Shouzhi, Hydration kinetics and microscopic analysis of calcium oxide expansion clinker, Concrete, 293 (2014) 75-78, in Chinese. [16] Dulu Appah, Peter Reichetseder, Practical improvements in CaO-swelling cements, Journal of Petroleum Science and Engineering 36 (2002) 61-70. [17] Aveline Darquennes, St#233;phanie Staquet, Marie-Paule Delplancke-Ogletree, Bernard Espion, Effect of autogenous deformation on the cracking risk of slag cement concretes, Cement Concrete Composites 33 (2011) 368-379. [18] Jose Colan Subauste, Ivan Odler, Stresses generated in expansive reactions of cementitious systems, Cement and Concrete Research 32 (2002) 117-122. [19] D. Jansen, F. Goetz-Neunhoeffer, B. Lothenbach, J. Neubauer, The early hydration of Ordinary Portland Cement (OPC): An approach comparing measured heat flow with calculated heat flow from QXRD, Cement and Concrete Research, 42 (2012) 134-138. [20] Xiang-Ming Kong, Hui Liu, Zhen-Bao Lu, Dong-MinWang, The influence of silanes on hydration and strength development of cementitious systems, Cement and Concrete Research 67 (2015) 168-178. [21] Huisheng Shi, Yujing Zhao, Wenwen Li, Effects of temperature on the hydration characteristics of free lime, Cement and Concrete Research 32 (2002) 789-793.

3. 毕业设计（论文）进程安排

2015-12-16 ~2016-03-01 相关文献查阅及综述、设计实验方案，撰写开题报告； 2016-03-23 ~2016-04-05 完成cao类、改性cao类膨胀剂的制备工作；熟悉相关实验设备和操作流程； 2016-04-06 ~2016-04-19 完成掺改性钙质膨胀剂的净浆、砂浆成型工作（先成型保水养护试件，1星期后成型密封养护试件） 2016-04-13 ~2016-04-30 初步筛选膨胀量相近、膨胀历程不同的膨胀材料，并进行抗裂性能实验； 2016-05-04 ~2016-05-24 依据28d的变形实验数据，进行抗裂性能试验；主要进行双圆环应力实验、单圆环开裂试验、温度应力试验机实验。

选取部分试块进行微结构观测，主要观测膨胀剂及膨胀产物的生长位置、生长形态等，以便能够对宏观现象进行合理解释。

2016-04-18 ~2016-06-13 完成毕业论文的各项结束工作和毕业答辩