本文選題：全珊瑚海水混凝土 + 珊瑚�。� 參考：《南京航空航天大學(xué)》2015年碩士論文

【摘要】：我國南海諸島分布眾多的珊瑚島礁,采用珊瑚與海水等原料,就地取材,配制珊瑚混凝土具有重要的理論意義和工程應(yīng)用價值。本文利用珊瑚骨料的破碎、混凝土攪拌等技術(shù)手段和富漿混凝土理論,采用正交設(shè)計方法進(jìn)行全珊瑚混凝土的配合比設(shè)計和優(yōu)化,得到了C30、C40、C50和C55的普通水泥全珊瑚海水混凝土以及C25堿式硫酸鎂水泥全珊瑚海水混凝土的配合比,并通過試驗得到了系列全珊瑚海水混凝土的基本性能。本文主要研究內(nèi)容和結(jié)論如下:1、研究了珊瑚骨料簡單破碎工藝,以及珊瑚風(fēng)化對骨料的影響。結(jié)果表明,與風(fēng)化珊瑚相比,未風(fēng)化珊瑚骨料表觀密度大,筒壓強(qiáng)度高;采用簡單破碎工藝以后,珊瑚骨料各項指標(biāo)均優(yōu)于破碎前的骨料:破碎后珊瑚骨料的筒壓強(qiáng)度提高約9.5%,含泥量降低約8%,針片狀顆粒含量降低約20%。2、進(jìn)行了全珊瑚混凝土的配合比設(shè)計及優(yōu)化。結(jié)果表明,全珊瑚混凝土立方體強(qiáng)度的配合比因素影響規(guī)律大小順序是:預(yù)吸水率凈水灰比質(zhì)量砂率總膠凝材料用量;通過多元回歸分析,得到全珊瑚混凝土抗壓強(qiáng)度與總水膠比、水泥用量和礦物摻合料之間的三元回歸關(guān)系,并得到了C30、C40、C50和C55全珊瑚海水混凝土的優(yōu)化配合比。3、研究了C30、C40、C50和C55全珊瑚海水混凝土的基本力學(xué)性能。與普通混凝土和普通輕集料混凝土的對比分析結(jié)果表明,全珊瑚海水混凝土的劈裂抗拉強(qiáng)度、抗折強(qiáng)度均大于相同立方體抗壓強(qiáng)度等級的普通混凝土和普通輕集料混凝土,而軸心抗壓強(qiáng)度則介于普通混凝土和普通輕集料混凝土之間;此外,全珊瑚海水混凝土的靜彈性模量略低于普通混凝土,但高于普通輕集料混凝土;全珊瑚混凝土的泊松比為0.25~0.28。4、研究了全珊瑚海水混凝土的基本力學(xué)性能之間的相互關(guān)系。結(jié)果表明,軸心抗壓強(qiáng)度和劈拉強(qiáng)度均與立方體抗壓強(qiáng)度有較強(qiáng)的線性關(guān)系;抗折強(qiáng)度與立方體抗壓強(qiáng)度之比范圍:0.102~0.103;彈性模量與立方體抗壓強(qiáng)度的關(guān)系符合普通混凝土的關(guān)系公式,但參數(shù)值有所變化。5、全珊瑚海水混凝土的應(yīng)力-應(yīng)變曲線上升段與普通混凝土的過鎮(zhèn)海上升段模型相同,下降段則明顯比普通混凝土的下降段要陡,說明全珊瑚混凝土的脆性比普通混凝土高。此外,全珊瑚海水混凝土的應(yīng)力應(yīng)變?nèi)�下降段與普通混凝土相比有所變化,下降段方程:y=x/（-α +（ α+1）x），， 1≤x 。6、堿式硫酸鎂水泥全珊瑚海水混凝土的劈裂抗拉強(qiáng)度、抗折強(qiáng)度均大于相同強(qiáng)度等級的普通硅酸鹽水泥全珊瑚海水混凝土,其彈性模量和普通硅酸鹽水泥全珊瑚海水混凝土比較接近;堿式硫酸鎂水泥全珊瑚海水混凝土的應(yīng)力應(yīng)變曲線下降段比普通水泥全珊瑚海水混凝土全曲線的下降段緩和,并且可以用過鎮(zhèn)海模型來描述,這充分說明了堿式硫酸鎂水泥能夠降低全珊瑚海水混凝土的脆性,并賦予其一定的韌性。
[Abstract]:There are many coral islands and reefs in the South China Sea. It is of great theoretical significance and engineering value to use coral and sea water as raw materials to prepare coral concrete. In this paper, the orthogonal design method is used to design and optimize the mix ratio of the whole coral concrete by using the technical means such as the crushing of coral aggregate and the mixing of concrete and the theory of rich concrete. The mixture ratio of C30C40C50 and C55 cement whole coral sea water concrete and C25 basic magnesium sulfate cement whole coral sea water concrete were obtained. The basic properties of series of whole coral sea water concrete were obtained by experiments. The main contents and conclusions of this paper are as follows: 1. The simple crushing process of coral aggregate and the effect of coral weathering on aggregate are studied. The results show that, compared with weathered coral, unweathered coral aggregate has high apparent density and high compressive strength. All the indexes of coral aggregate are better than those before crushing. The compressive strength of coral aggregate is increased about 9.5%, the content of mud is reduced about 8%, and the content of needle particle is reduced about 20%. The mix ratio of whole coral concrete is designed and optimized. The results show that the order of the factors affecting the cubic strength of coralline concrete is: preabsorbency, water-cement ratio, total cement content, multivariate regression analysis, The relationship between compressive strength of whole coral concrete and total water-binder ratio, cement content and mineral admixture is obtained. The optimum mix ratio of C30C40C50 and C55 whole coral sea water concrete was obtained. The basic mechanical properties of C30C40C50 and C55 whole coral sea water concrete were studied. The results of comparison with ordinary concrete and ordinary lightweight aggregate concrete show that the splitting tensile strength and flexural strength of the whole coral sea water concrete are higher than those of ordinary concrete and ordinary lightweight aggregate concrete with the same cube compressive strength grade. The axial compressive strength is between ordinary concrete and ordinary lightweight aggregate concrete, in addition, the static elastic modulus of the whole coral sea water concrete is slightly lower than that of ordinary concrete, but higher than that of ordinary lightweight aggregate concrete. The Poisson's ratio of the whole coral concrete is 0.25m 0.28.4. the relationship between the basic mechanical properties of the whole coral sea water concrete is studied. The results show that the axial compressive strength and splitting tensile strength have a strong linear relationship with the cube compressive strength. The ratio of flexural strength to cube compressive strength is in the range of: 0.102 / 0.103. The relation between elastic modulus and cube compressive strength is in accordance with the relation formula of ordinary concrete. But the parameter value of the whole coral sea water concrete is changed. The rising section of the stress-strain curve of the whole coral sea concrete is the same as the model of the ordinary concrete rising section through Zhenhai, and the descending section is obviously steeper than that of the ordinary concrete. It shows that the brittleness of whole coral concrete is higher than that of ordinary concrete. In addition, the whole stress-strain curve of the whole coral sea water concrete is different from that of the ordinary concrete. The equation of the descending section is: (1) x / r 偽 (1 鈮

本文編號：2002334