绿色混凝土早期抗裂性能研究

试验采用大掺量矿物掺和料以及聚羧酸高效减水剂,研究了绿色混凝土的早期抗裂性能.结果表明：随着胶凝材料用量的增加,裂缝面积及最大裂缝宽度增大;同胶凝材料用量时,单掺矿粉系列混凝土的开裂面积达到单掺粉煤灰系列的2～4倍,最大裂缝宽度约达到粉煤灰系列的2倍;提高水泥用量或复掺超细矿粉时,混凝土强度提高,但早期抗裂性能降低;复掺抗裂防水剂时,早期养护不充分条件下,混凝土的抗裂性能显著降低;早期养护对绿色混凝土的抗裂性能有较大的影响,实际生产中采用绿色混凝土,将表现出优异的抗裂性能.

Study on the Early Anti-Cracking Performance of Green Concrete

The early anti-cracking behaviors of the green concrete which is added to large dosage different mineral adixtures and polycarboxylic high-performance water-reducing agent are studied in this paper.The results go as follows： with the increase in the amount of cementitious material,the cracking area and the maxium cracking width of the concrete increase,when general slag is singly added,the crack area is 2～4 times that of singly adding fly ash,while the maxium width is about 2 times;when superfine slag is added,the strength can be improved but the ant-cracking performance is reduced.If adding waterproof admixture under the condition of the maintenance inadequate in early stage,the anti-cracking performance significantly reduces;curing conditions of early stage have a great influence on the anti-cracking performance.If effective conservation is conducted in early stage,the green concrete shows excellent anti-cracking performance.