砂浆碱集料反应细观数值模拟

doi:10.13229/j.cnki.jdxbgxb.20220916

Abstract

Abstract:

Because there is vertical pressure on the upper part in the field test of local mortar alkali aggregate， in order to study the mechanical properties of mortar alkali aggregate reaction， a mesoscopic numerical simulation of mortar alkali aggregate reaction was carried out. The sample was prepared by mortar bar rapid method， and the expansion rate， compressive strength and flexural strength of mortar sample were measured. The mortar sample was regarded as a three-phase composite material composed of aggregate， interface transition zone （ITZ） and mortar matrix， and the alkali-aggregate reaction expansion model and alkali-aggregate reaction strength model were established to simulate the compressive and flexural properties of samples with different sizes at different ages， which solves the problem of high compressive and flexural strength of mortar， and obtains the conclusion that the simulation results are basically consistent with the test results. The simulation has good practicability.

Key words: mortar, alkali aggregate reaction, meso numerical model, mechanical property

CLC Number:

TU528.56

Li-li WEI,Ming-yu HU. Meso numerical simulation of alkali aggregate reaction in mortar[J].Journal of Jilin University(Engineering and Technology Edition), 2023, 53(12): 3501-3507.

Figures/Tables 9

Table 1

Table 2

Table 3

Fig.1

Fig.2

Table 4

Mechanical parameters of mortar materials"

周期/d	原料	密度/ （t·mm^-3）	杨氏模量/10³	泊松比	热膨胀系数/10^-5	膨胀角/（°）	偏心率	$f b 0 / f c 0$	k	黏性系数	抗压强度/MPa	抗拉强度/MPa
7	骨料	2.30	50	0.2	1.40	30	0.1	1.16	0.667	0.005	100	10
	ITZ	1.80	26	0.2	175	30	0.1	1.16	0.667	0.005	25	2.5
	砂浆基体	1.80	30	0.2	1.40	30	0.1	1.16	0.667	0.005	28	4.7
14	骨料	2.30	50	0.2	1.40	30	0.1	1.16	0.667	0.005	100	10
	ITZ	1.80	26	0.2	330	30	0.1	1.16	0.667	0.005	25	2.5
	砂浆基体	1.80	30	0.2	1.40	30	0.1	1.16	0.667	0.005	40	5.5
28	骨料	2.30	50	0.2	1.40	30	0.1	1.16	0.667	0.005	100	10
	ITZ	1.80	26	0.2	450	30	0.1	1.16	0.667	0.005	25	2.5
	砂浆基体	1.80	30	0.2	1.40	30	0.1	1.16	0.667	0.005	51.5	6
60	骨料	2.30	50	0.2	1.40	30	0.1	1.16	0.667	0.005	100	10
	ITZ	1.80	26	0.2	560	30	0.1	1.16	0.667	0.005	25	2.5
	砂浆基体	1.80	30	0.2	1.40	30	0.1	1.16	0.667	0.005	53.88	7.3

Table 4

Fig.3

Fig.4

Fig.5

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项目	抗折强度/MPa		抗压强度/MPa		凝结周期/min
项目	3 d	28 d	3 d	28 d	初凝	终凝
标准要求	≥4.0	≥6.5	≥22.0	≥42.5	>45	<390
测定值	5.7	9	27	50.1	133	225

试样编号	试样规格/mm	水泥质量/g	NaOH质量/g	水质量/g	集料质量/g
W₁	25×25×280	440	2.84	206.8	990
W₂	40×40×160	484	0	227.5	1089
W₃	40×40×160	484	3.12	227.5	1089

试样	7 d		14 d		28 d		60 d
试样	抗压	抗折	抗压	抗折	抗压	抗折	抗压	抗折
W₂	7.54	31.28	8.66	43.47	9.44	55.94	10.71	58.52
W₃	9.31	40.77	9.36	41.23	10.73	47.26	8.04	30.72

Meso numerical simulation of alkali aggregate reaction in mortar

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