This study aims to explore the mechanical and micro performance of seawater and sea sand concrete under accelerated carbonization environment. This study designed a total of 8 mix ratios, mainly to explore the effects of different water-cement ratios and different mineral admixtures (FA and LC2) on the properties of seawater and sea sand concrete after carbonization. To better evaluate and understand the mechanical properties, the micro morphology analysis was carried out by SEM, the hydration product analysis was carried out by TGA and XRD, and the pore structure was studied by MIP. The results show that the standard curing of seawater and sea sand concrete for 28 days can increase the compressive strength by about 10% compared with ordinary concrete, but the final mechanical strength is similar to ordinary concrete under the condition of long-term accelerated carbonization. The carbonation resistance performance of seawater and sea sand concrete is approximately twice that of ordinary concrete, but when FA and LC2 are added, the property of carbonation resistance will be reduced by more than two times. The large amount of chloride ions added into the concrete by seawater and sea sand will reduce the total porosity of the concrete by about 13% and improve the pore size distribution. In general, to improve the current shortage of natural resources such as river water and river sand, it is feasible to consider adding seawater and sea sand into ordinary concrete.

本研究旨在探讨海水和海砂混凝土在加速碳化环境下的力学和微观性能。本研究共设计了8种配合比，主要探讨不同水灰比和不同矿物掺合料（FA和LC2）对碳化后海水和海砂混凝土性能的影响。为了更好地评价和了解力学性能，SEM进行了微观形貌分析，TGA和XRD进行了水合产物分析，MIP进行了孔结构研究。结果表明，海水和海砂混凝土标准养护28天比普通混凝土抗压强度提高10%左右，但在长期加速碳化条件下，最终的机械强度与普通混凝土相近。海水和海砂混凝土的抗碳化性能约为普通混凝土的两倍，但加入FA和LC2后，抗碳化性能会降低两倍以上。海水和海砂向混凝土中加入大量氯离子，会使混凝土的总孔隙率降低13%左右，改善孔径分布。总的来说，为了改善目前河水、河砂等自然资源的短缺，考虑在普通混凝土中加入海水和海砂是可行的。海水和海砂混凝土的抗碳化性能约为普通混凝土的两倍，但加入FA和LC2后，抗碳化性能会降低两倍以上。海水和海砂向混凝土中加入大量氯离子，会使混凝土的总孔隙率降低13%左右，改善孔径分布。总的来说，为了改善目前河水、河砂等自然资源的短缺，考虑在普通混凝土中加入海水和海砂是可行的。海水和海砂混凝土的抗碳化性能约为普通混凝土的两倍，但加入FA和LC2后，抗碳化性能会降低两倍以上。海水和海砂向混凝土中加入大量氯离子，会使混凝土的总孔隙率降低13%左右，改善孔径分布。总的来说，为了改善目前河水、河砂等自然资源的短缺，考虑在普通混凝土中加入海水和海砂是可行的。海水和海砂向混凝土中加入大量氯离子，会使混凝土的总孔隙率降低13%左右，改善孔径分布。总的来说，为了改善目前河水、河砂等自然资源的短缺，考虑在普通混凝土中加入海水和海砂是可行的。海水和海砂向混凝土中加入大量氯离子，会使混凝土的总孔隙率降低13%左右，改善孔径分布。总的来说，为了改善目前河水、河砂等自然资源的短缺，考虑在普通混凝土中加入海水和海砂是可行的。